Pub Date : 2022-04-20DOI: 10.1080/00194506.2022.2065368
M. Anubha, R. Saranya, C. Chandrasatheesh, J. Jayapriya
ABSTRACT Cornstarch (CS) is an inexpensive and widely available material that can be easily moulded into thermoplastic starch (TPS) films when mixed with the plasticising agent glycerol (CS- Gly). However, its applications in the packaging sector are limited due to its brittleness and high-water solubility. To enhance the functional characteristics of the CS- Gly films in packaging applications, it was blended with neem gum at the concentrations of 0.3 and 0.9% (w/w). The tensile strength, elongation percentage, water sorption and biodegradability efficacy of the blended cornstarch films (CS-Gly-NG) were analysed. The tensile strength of the blended film improved by 1.1-fold compared with CS-Gly (24.49 ± 0.72 MPa) when the natural gum additive was used at 0.30% (w/w). However, once the natural gum content was raised to 0.9% (w/w), the TS of the film decreased to 21.28 ± 1.75 MPa, whereas the resistance to water solubility improved to a greater extent. Moreover, the biodegradability test showed that the blended films (64-69 wt %) disintegrated more rapidly than the CS-Gly film (17.3%) in a setting akin to the natural environment. Therefore, this blended film (CS-Gly-NG) can be used as an alternative to the commercially available non-biodegradable polyethene films and will have a positive impact on the environment. GRAPHICAL ABSTRACT
{"title":"Effect of neem gum on water sorption, biodegradability and mechanical properties of thermoplastic corn starch-based packaging films","authors":"M. Anubha, R. Saranya, C. Chandrasatheesh, J. Jayapriya","doi":"10.1080/00194506.2022.2065368","DOIUrl":"https://doi.org/10.1080/00194506.2022.2065368","url":null,"abstract":"ABSTRACT Cornstarch (CS) is an inexpensive and widely available material that can be easily moulded into thermoplastic starch (TPS) films when mixed with the plasticising agent glycerol (CS- Gly). However, its applications in the packaging sector are limited due to its brittleness and high-water solubility. To enhance the functional characteristics of the CS- Gly films in packaging applications, it was blended with neem gum at the concentrations of 0.3 and 0.9% (w/w). The tensile strength, elongation percentage, water sorption and biodegradability efficacy of the blended cornstarch films (CS-Gly-NG) were analysed. The tensile strength of the blended film improved by 1.1-fold compared with CS-Gly (24.49 ± 0.72 MPa) when the natural gum additive was used at 0.30% (w/w). However, once the natural gum content was raised to 0.9% (w/w), the TS of the film decreased to 21.28 ± 1.75 MPa, whereas the resistance to water solubility improved to a greater extent. Moreover, the biodegradability test showed that the blended films (64-69 wt %) disintegrated more rapidly than the CS-Gly film (17.3%) in a setting akin to the natural environment. Therefore, this blended film (CS-Gly-NG) can be used as an alternative to the commercially available non-biodegradable polyethene films and will have a positive impact on the environment. GRAPHICAL ABSTRACT","PeriodicalId":13430,"journal":{"name":"Indian Chemical Engineer","volume":"64 1","pages":"594 - 606"},"PeriodicalIF":1.5,"publicationDate":"2022-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41427142","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-04-06DOI: 10.1080/00194506.2022.2059020
S. Yapici, İlhan Altay
ABSTRACT Stirred vessels are encountered in a wide scale of applications from bench to industrial processes, and the knowledge of the heat/mass transfer rates in these vessels is required for their design, operation and control. This work submits an investigation on the mass transfer to a small circular surface immersed in a stirred vessel in the parameter ranges of 267 < Re < 9437, 1473 < Sc < 61,422, and 0.022 < x/dK < 0.22 for the distance between the impeller blade tip and the transfer surface. The Reynolds number was based on the impeller diameter. The electrochemical limiting diffusion current technique having a potassium ferri-/ferrocyanide system was applied for mass transfer coefficient measurements. Aqueous glycerine solutions were prepared to attain a wide range of Sc numbers. The rate of mass transfer is enhanced with increasing rotation rate, decreasing blade tip-to-electrode surface distance, and decreasing glycerine concentration. The experimental data were well correlated by the relation . GRAPHICAL ABSTRACT
{"title":"Effect of distance between impeller blade tip and surface on mass transfer to a local electrode in a stirred vessel in a wide range of Sc number","authors":"S. Yapici, İlhan Altay","doi":"10.1080/00194506.2022.2059020","DOIUrl":"https://doi.org/10.1080/00194506.2022.2059020","url":null,"abstract":"ABSTRACT\u0000 Stirred vessels are encountered in a wide scale of applications from bench to industrial processes, and the knowledge of the heat/mass transfer rates in these vessels is required for their design, operation and control. This work submits an investigation on the mass transfer to a small circular surface immersed in a stirred vessel in the parameter ranges of 267 < Re < 9437, 1473 < Sc < 61,422, and 0.022 < x/dK < 0.22 for the distance between the impeller blade tip and the transfer surface. The Reynolds number was based on the impeller diameter. The electrochemical limiting diffusion current technique having a potassium ferri-/ferrocyanide system was applied for mass transfer coefficient measurements. Aqueous glycerine solutions were prepared to attain a wide range of Sc numbers. The rate of mass transfer is enhanced with increasing rotation rate, decreasing blade tip-to-electrode surface distance, and decreasing glycerine concentration. The experimental data were well correlated by the relation . GRAPHICAL ABSTRACT","PeriodicalId":13430,"journal":{"name":"Indian Chemical Engineer","volume":"64 1","pages":"576 - 593"},"PeriodicalIF":1.5,"publicationDate":"2022-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45239623","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-03-15DOI: 10.1080/00194506.2021.1914198
B. Hu, J. Song, Liang Wei, Shisong Yue, Jinxin Jia
ABSTRACT Feng Xuan (FX) dry separators can effectively separate coal-series kaolinite. Coal-series kaolinite from Inner Mongolia (China) was selected as the sample. Computational fluid dynamics (CFD) and the discrete element method (DEM) were used to study velocity field, pressure field, turbulent kinetic energy field, and particle-motion characteristics of the FX dry separator. The results showed that the air velocity and pressure of the four air chambers symmetrically distributed from the centre to the surrounding area, and their values gradually decreased. The heavy products were located at the lower part of the material layer and moved horizontally along the sieve plate, the light products were located on the upper part of the material layer and moved obliquely along the sieve plate, and the intermediate products aggregated along horizontal and inclined directions, and their compaction effect on heavy products was obvious at the end of the sieve plate. This study provided a new way to optimise the structural parameters of FX dry separators. GRAPHICAL ABSTRACT
Feng Xuan (FX)干式分选机可有效分离煤系高岭石。选取中国内蒙古的煤系高岭石作为样品。采用计算流体力学(CFD)和离散元法(DEM)对FX干式分离器的速度场、压力场、湍流动能场和颗粒运动特性进行了研究。结果表明:4个气室的风速和压力由中心向周围对称分布，其数值逐渐减小;重产物位于料层下部沿筛板水平移动，轻产物位于料层上部沿筛板斜向移动，中间产物沿水平和倾斜方向聚集，在筛板末端对重产物的压实作用明显。该研究为优化FX干燥分离器的结构参数提供了一条新的途径。图形抽象
{"title":"Analysis of flow-field and particle-motion characteristics in the dry separation process for coal-series kaolin","authors":"B. Hu, J. Song, Liang Wei, Shisong Yue, Jinxin Jia","doi":"10.1080/00194506.2021.1914198","DOIUrl":"https://doi.org/10.1080/00194506.2021.1914198","url":null,"abstract":"ABSTRACT Feng Xuan (FX) dry separators can effectively separate coal-series kaolinite. Coal-series kaolinite from Inner Mongolia (China) was selected as the sample. Computational fluid dynamics (CFD) and the discrete element method (DEM) were used to study velocity field, pressure field, turbulent kinetic energy field, and particle-motion characteristics of the FX dry separator. The results showed that the air velocity and pressure of the four air chambers symmetrically distributed from the centre to the surrounding area, and their values gradually decreased. The heavy products were located at the lower part of the material layer and moved horizontally along the sieve plate, the light products were located on the upper part of the material layer and moved obliquely along the sieve plate, and the intermediate products aggregated along horizontal and inclined directions, and their compaction effect on heavy products was obvious at the end of the sieve plate. This study provided a new way to optimise the structural parameters of FX dry separators. GRAPHICAL ABSTRACT","PeriodicalId":13430,"journal":{"name":"Indian Chemical Engineer","volume":"64 1","pages":"208 - 218"},"PeriodicalIF":1.5,"publicationDate":"2022-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/00194506.2021.1914198","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"59212869","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-03-15DOI: 10.1080/00194506.2022.2048096
Pravritt Kushwaha, Saleel Ismail
ABSTRACT Renewable sources of energy help mitigate the environmental concerns associated with fossil fuel combustion and in meeting the ever-increasing energy demand. The use of HHO gas in I.C. Engines becomes promising in this context. HHO gas is a mixture of hydrogen and oxygen in the ratio 2:1, produced by the electrolysis of water. In this research, alkaline electrolysis was used for producing HHO gas using KOH as an electrolyte. This HHO gas was introduced in the intake manifold of the C.I. engine, making it operate in dual-fuel mode. The effects of HHO gas addition on engine performance and emissions were investigated. The variation of diesel injector protrusion (DIP) by +/− 1 mm from its normal position was also studied. This was achieved using washers of varying thicknesses. Three different HHO gas injection locations, namely port, manifold, and upstream, were compared to determine the most suitable position. The simultaneous evaluation of the effects of DIP and HHO injection location makes this study unique. BSFC, peak pressure, HC, CO, CO2 and smoke emissions were observed to be lower, while BTE, NOx and O2 emissions were enhanced for the optimum condition of + 1 mm DIP, PI with 1.63 LPM of HHO gas. GRAPHICAL ABSTRACT
摘要可再生能源有助于缓解与化石燃料燃烧相关的环境问题，并满足不断增长的能源需求。在这种情况下，在内燃机中使用HHO气体变得很有前景。HHO气体是氢气和氧气的混合物，比例为2:1，通过电解水产生。在本研究中，以KOH为电解质，采用碱性电解法生产HHO气体。这种HHO气体被引入C.I.发动机的进气歧管，使其在双燃料模式下运行。研究了添加HHO气体对发动机性能和排放的影响。柴油机喷油器突出量（DIP）随+/-的变化 1. 还研究了离其正常位置mm的距离。这是使用不同厚度的垫圈实现的。比较了三种不同的HHO气体注入位置，即端口、歧管和上游，以确定最合适的位置。DIP和HHO注射位置效果的同时评估使本研究具有独特性。BSFC、峰值压力、HC、CO、CO2和烟雾排放量较低，而BTE、NOx和O2排放量在最佳条件下有所增加+ 1. mm DIP、PI和1.63 LPM的HHO气体。图形摘要
{"title":"Investigation of the effects of oxyhydrogen gas (HHO) flow rate and injector penetration on the performance of a dual fuel CI engine","authors":"Pravritt Kushwaha, Saleel Ismail","doi":"10.1080/00194506.2022.2048096","DOIUrl":"https://doi.org/10.1080/00194506.2022.2048096","url":null,"abstract":"ABSTRACT Renewable sources of energy help mitigate the environmental concerns associated with fossil fuel combustion and in meeting the ever-increasing energy demand. The use of HHO gas in I.C. Engines becomes promising in this context. HHO gas is a mixture of hydrogen and oxygen in the ratio 2:1, produced by the electrolysis of water. In this research, alkaline electrolysis was used for producing HHO gas using KOH as an electrolyte. This HHO gas was introduced in the intake manifold of the C.I. engine, making it operate in dual-fuel mode. The effects of HHO gas addition on engine performance and emissions were investigated. The variation of diesel injector protrusion (DIP) by +/− 1 mm from its normal position was also studied. This was achieved using washers of varying thicknesses. Three different HHO gas injection locations, namely port, manifold, and upstream, were compared to determine the most suitable position. The simultaneous evaluation of the effects of DIP and HHO injection location makes this study unique. BSFC, peak pressure, HC, CO, CO2 and smoke emissions were observed to be lower, while BTE, NOx and O2 emissions were enhanced for the optimum condition of + 1 mm DIP, PI with 1.63 LPM of HHO gas. GRAPHICAL ABSTRACT","PeriodicalId":13430,"journal":{"name":"Indian Chemical Engineer","volume":"64 1","pages":"530 - 542"},"PeriodicalIF":1.5,"publicationDate":"2022-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44457747","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-03-13DOI: 10.1080/00194506.2022.2046510
S. Poddar, J. N. Ullas Krishnan, J. S. Chandra Babu
ABSTRACT The development of industries requires energy sources. Therefore, the requirement for alternative renewal energy sources increases. They are solar, wind, wave, geothermal, and biomass. For the generation of energy from these sources, we apply thermochemical and biochemical methods. Amidst all the thermochemical origins, pyrolysis is advancing attention due to its ability to produce solid, liquid, and gaseous products. This article represents the non-catalytic and catalytic pyrolysis (573 -1173K) experiments conducted in a semi-batch reactor and TGA set up for citrus wastes (orange peel) collected from the local fruit juice seller outlet. The effect of catalysts observed and concluded that the presence of catalysts increases the yield of pyro-oil (30.79 wt.%→ 49.45 wt.%) with ZnO nanocatalyst to be the best performing catalyst. Reaction kinetics were also determined using isothermal and non-isothermal methods. The pH values of the pyro-oil investigated and observed that citrus waste pyro-oil is acidic, but the presence of catalyst makes it basic. The GC analysis of the pyro-gas infers that the gas contains CO and H2, which can be used as an energy source and feedstock for the Fischer–Tropsch process. Therefore, the utility of this type of pyrolyser is done in municipal areas of large cities. GRAPHICAL ABSTRACT
{"title":"Non-catalytic and catalytic pyrolysis of citrus waste (orange peel)","authors":"S. Poddar, J. N. Ullas Krishnan, J. S. Chandra Babu","doi":"10.1080/00194506.2022.2046510","DOIUrl":"https://doi.org/10.1080/00194506.2022.2046510","url":null,"abstract":"ABSTRACT The development of industries requires energy sources. Therefore, the requirement for alternative renewal energy sources increases. They are solar, wind, wave, geothermal, and biomass. For the generation of energy from these sources, we apply thermochemical and biochemical methods. Amidst all the thermochemical origins, pyrolysis is advancing attention due to its ability to produce solid, liquid, and gaseous products. This article represents the non-catalytic and catalytic pyrolysis (573 -1173K) experiments conducted in a semi-batch reactor and TGA set up for citrus wastes (orange peel) collected from the local fruit juice seller outlet. The effect of catalysts observed and concluded that the presence of catalysts increases the yield of pyro-oil (30.79 wt.%→ 49.45 wt.%) with ZnO nanocatalyst to be the best performing catalyst. Reaction kinetics were also determined using isothermal and non-isothermal methods. The pH values of the pyro-oil investigated and observed that citrus waste pyro-oil is acidic, but the presence of catalyst makes it basic. The GC analysis of the pyro-gas infers that the gas contains CO and H2, which can be used as an energy source and feedstock for the Fischer–Tropsch process. Therefore, the utility of this type of pyrolyser is done in municipal areas of large cities. GRAPHICAL ABSTRACT","PeriodicalId":13430,"journal":{"name":"Indian Chemical Engineer","volume":"64 1","pages":"433 - 460"},"PeriodicalIF":1.5,"publicationDate":"2022-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44955621","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-03-09DOI: 10.1080/00194506.2022.2046509
N. Bhullar, M. Garg, K. Kumari, D. Sud
ABSTRACT The current study reports the preparation and application of bio-based polymer composite hydrogel with and without a crosslinker for the removal of industrial dye procion blue HERD (PB). Biopolymer chitosan, acrylic acid as a monomer and potassium persulphate (K2S2O8) as an initiator synthesise composite hydrogel. The crosslinked composite hydrogel is synthesised by the microwave irradiation technique using thiourea (CH4N2S) as a crosslinker. Chitosan-based hydrogel synthesised without crosslinker (CH) and with crosslinker thiourea (CH-T) is analysed using techniques, such as Fourier transform infrared spectroscopy (FT-IR), thermogravimetric analysis (TGA), differential thermal analysis (DTG) and derivative thermogravimetric analysis (DTA). The adsorption capacity of CH and CH-T for the removal of PB from an aqueous solution is investigated. The removal efficiency of hydrogel is 90% in a solution of pH 7 for a constant dose of PB (5 mg L−1). The experimental data attained for the adsorption of industrial dye (PB) onto CH and CH-T showed a perfect fit for Freundlich and Langmuir isotherms. The perfect fit of experimental data for PB decolorisation is observed for pseudo-second-order kinetic equation with k values 10.17 × 10−3 mg−1 min−1 and 6.719 × 10−3 mg−1 min−1 with CH and CH-T, respectively. GRAPHICAL ABSTRACT
{"title":"Synthesis of biopolymer chitosan-based hydrogels with and without a crosslinker for the removal of industrial dye procion blue HERD: a comparative study","authors":"N. Bhullar, M. Garg, K. Kumari, D. Sud","doi":"10.1080/00194506.2022.2046509","DOIUrl":"https://doi.org/10.1080/00194506.2022.2046509","url":null,"abstract":"ABSTRACT The current study reports the preparation and application of bio-based polymer composite hydrogel with and without a crosslinker for the removal of industrial dye procion blue HERD (PB). Biopolymer chitosan, acrylic acid as a monomer and potassium persulphate (K2S2O8) as an initiator synthesise composite hydrogel. The crosslinked composite hydrogel is synthesised by the microwave irradiation technique using thiourea (CH4N2S) as a crosslinker. Chitosan-based hydrogel synthesised without crosslinker (CH) and with crosslinker thiourea (CH-T) is analysed using techniques, such as Fourier transform infrared spectroscopy (FT-IR), thermogravimetric analysis (TGA), differential thermal analysis (DTG) and derivative thermogravimetric analysis (DTA). The adsorption capacity of CH and CH-T for the removal of PB from an aqueous solution is investigated. The removal efficiency of hydrogel is 90% in a solution of pH 7 for a constant dose of PB (5 mg L−1). The experimental data attained for the adsorption of industrial dye (PB) onto CH and CH-T showed a perfect fit for Freundlich and Langmuir isotherms. The perfect fit of experimental data for PB decolorisation is observed for pseudo-second-order kinetic equation with k values 10.17 × 10−3 mg−1 min−1 and 6.719 × 10−3 mg−1 min−1 with CH and CH-T, respectively. GRAPHICAL ABSTRACT","PeriodicalId":13430,"journal":{"name":"Indian Chemical Engineer","volume":"64 1","pages":"461 - 478"},"PeriodicalIF":1.5,"publicationDate":"2022-03-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43557519","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-03-08DOI: 10.1080/00194506.2022.2046511
Yamanappagouda Amaregouda, Kantharaju Kamanna
ABSTRACT The novel L-valine functionalised polyvinyl alcohol (PVA)/CuO NPs and PVA/carboxymethyl cellulose (CMC)/Copper oxide nanocomposite (NCs) films were prepared by the solvent casting method. The required CuO NPs for NC films are prepared by the novel biogenic method using Euphorbia heterophylla plant leaves extract. Various spectroscopic techniques were employed for the characterisation of biogenic prepared CuO NPs and polymeric NC films prepared, namely X-ray diffraction, scanning electron microscopy and UV–visible spectroscopy. In-vitro cytotoxicity of the prepared NC films showed cell viability (%) >80% against human embryonic kidney cell lines (for films F3 & F4). In addition, the prepared NC films (F3 & F4) exhibited potent anti-bacterial and anti-fungal activity towards E. coli, S. aureus, C. tropicalis, and C. albicans. Furthermore, the prepared NCs films showed promising results in water contact angle (66.1%), water vapour permeability (28.09%), moisture retention capacity (94%), soil biodegradable test (42%), optical transparency (58.63%) and thermal properties. The obtained results suggested us the prepared PVA/CMC/CuO NPs films can be implemented in biomedical, environmental protection, and food packaging purposes. GRAPHICAL ABSTRACT
{"title":"Physico-chemical, in-vitro cytotoxicity and antimicrobial evaluation of L-valine functionalised CuO NPs on polyvinyl alcohol and blended carboxymethyl cellulose films","authors":"Yamanappagouda Amaregouda, Kantharaju Kamanna","doi":"10.1080/00194506.2022.2046511","DOIUrl":"https://doi.org/10.1080/00194506.2022.2046511","url":null,"abstract":"ABSTRACT The novel L-valine functionalised polyvinyl alcohol (PVA)/CuO NPs and PVA/carboxymethyl cellulose (CMC)/Copper oxide nanocomposite (NCs) films were prepared by the solvent casting method. The required CuO NPs for NC films are prepared by the novel biogenic method using Euphorbia heterophylla plant leaves extract. Various spectroscopic techniques were employed for the characterisation of biogenic prepared CuO NPs and polymeric NC films prepared, namely X-ray diffraction, scanning electron microscopy and UV–visible spectroscopy. In-vitro cytotoxicity of the prepared NC films showed cell viability (%) >80% against human embryonic kidney cell lines (for films F3 & F4). In addition, the prepared NC films (F3 & F4) exhibited potent anti-bacterial and anti-fungal activity towards E. coli, S. aureus, C. tropicalis, and C. albicans. Furthermore, the prepared NCs films showed promising results in water contact angle (66.1%), water vapour permeability (28.09%), moisture retention capacity (94%), soil biodegradable test (42%), optical transparency (58.63%) and thermal properties. The obtained results suggested us the prepared PVA/CMC/CuO NPs films can be implemented in biomedical, environmental protection, and food packaging purposes. GRAPHICAL ABSTRACT","PeriodicalId":13430,"journal":{"name":"Indian Chemical Engineer","volume":"64 1","pages":"543 - 552"},"PeriodicalIF":1.5,"publicationDate":"2022-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48846924","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-03-06DOI: 10.1080/00194506.2022.2046512
G. Keerthiga, A. Sridhar
ABSTRACT Traditional herbs are investigated for their medicinal properties and feasible large scale low cost extraction techniques. The extraction of phenolic content from different plant matrices has been a huge challenge and largely depends on the effectiveness and efficiency of selected extraction methods. The estimation of total phenolic content from Syzygium Cumin.L (Jamun bark) and its optimisation of extraction conditions with respect to nature of solvent, solvent ratios, particle size and solid to solvent ratio were carried out in this study. Room temperature based batch mode of extraction of Syzygium Cumini L bark has been performed and compared with conventional Soxhlet extraction. The total phenolic extraction rate for different ratios of methanol–water and ethanol–water were investigated where methanol–water ratio of 70:30 yields high phenolic extraction rate of 49.22 ± 5.3 mg GAE/g. The particle size of 0.05–0.06 mm, solvent to solid ratio of 3:1 yielded higher total phenolic content of 47.22 ± 3.35 mg GAE/g. The extraction followed second-order kinetics with 98% goodness of fit. Feasible optimised mode of extraction of total phenolic compound shows promising directions towards industrial extraction. GRAPHICAL ABSTRACT
{"title":"Batch extraction kinetics and total phenolic content estimation of Syzygium Cumini.L bark","authors":"G. Keerthiga, A. Sridhar","doi":"10.1080/00194506.2022.2046512","DOIUrl":"https://doi.org/10.1080/00194506.2022.2046512","url":null,"abstract":"ABSTRACT Traditional herbs are investigated for their medicinal properties and feasible large scale low cost extraction techniques. The extraction of phenolic content from different plant matrices has been a huge challenge and largely depends on the effectiveness and efficiency of selected extraction methods. The estimation of total phenolic content from Syzygium Cumin.L (Jamun bark) and its optimisation of extraction conditions with respect to nature of solvent, solvent ratios, particle size and solid to solvent ratio were carried out in this study. Room temperature based batch mode of extraction of Syzygium Cumini L bark has been performed and compared with conventional Soxhlet extraction. The total phenolic extraction rate for different ratios of methanol–water and ethanol–water were investigated where methanol–water ratio of 70:30 yields high phenolic extraction rate of 49.22 ± 5.3 mg GAE/g. The particle size of 0.05–0.06 mm, solvent to solid ratio of 3:1 yielded higher total phenolic content of 47.22 ± 3.35 mg GAE/g. The extraction followed second-order kinetics with 98% goodness of fit. Feasible optimised mode of extraction of total phenolic compound shows promising directions towards industrial extraction. GRAPHICAL ABSTRACT","PeriodicalId":13430,"journal":{"name":"Indian Chemical Engineer","volume":"64 1","pages":"565 - 575"},"PeriodicalIF":1.5,"publicationDate":"2022-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44238737","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-02-01DOI: 10.1080/00194506.2022.2028197
K. Nath, V. B. Patel, H. Dave, S. Panchani
ABSTRACT Ultrafiltration of spent sulphite liquor, generated from a laboratory sulphite pulping using chopped stems of Prosopis juliflora, was carried out to recover sodium lignosulfonate (SLS). A commercial hydrophilised polyethersulfone flat-sheet membrane with a molecular weight cut-off of 5 kD was used for the experiments. Effects of the feed dilution factor on the permeate flux were observed, and actual solute rejection coefficients were investigated due to the formation of the concentration polarised layer on the membrane surface. In addition, flux decline and the fouling index of the membrane were determined under the present experimental conditions. SLS obtained in the reject stream was characterised following UV–VIS and nuclear magnetic resonance spectroscopy. The spectroscopic analysis confirmed the reduction of the lignin and hemicelluloses component of wood sample effectively into SLS during sulphite pulping with a considerable degree of similarity with the control sample. The results could be useful as guidelines for the scale-up of SLS production and simultaneous treatment of sulphite liquor from the paper and pulp industry. GRAPHICAL ABSTRACT
{"title":"Valorisation of sodium lignosulfonate by ultrafiltration of spent sulphite liquor using commercial polyethersulfone membrane","authors":"K. Nath, V. B. Patel, H. Dave, S. Panchani","doi":"10.1080/00194506.2022.2028197","DOIUrl":"https://doi.org/10.1080/00194506.2022.2028197","url":null,"abstract":"ABSTRACT Ultrafiltration of spent sulphite liquor, generated from a laboratory sulphite pulping using chopped stems of Prosopis juliflora, was carried out to recover sodium lignosulfonate (SLS). A commercial hydrophilised polyethersulfone flat-sheet membrane with a molecular weight cut-off of 5 kD was used for the experiments. Effects of the feed dilution factor on the permeate flux were observed, and actual solute rejection coefficients were investigated due to the formation of the concentration polarised layer on the membrane surface. In addition, flux decline and the fouling index of the membrane were determined under the present experimental conditions. SLS obtained in the reject stream was characterised following UV–VIS and nuclear magnetic resonance spectroscopy. The spectroscopic analysis confirmed the reduction of the lignin and hemicelluloses component of wood sample effectively into SLS during sulphite pulping with a considerable degree of similarity with the control sample. The results could be useful as guidelines for the scale-up of SLS production and simultaneous treatment of sulphite liquor from the paper and pulp industry. GRAPHICAL ABSTRACT","PeriodicalId":13430,"journal":{"name":"Indian Chemical Engineer","volume":"64 1","pages":"553 - 564"},"PeriodicalIF":1.5,"publicationDate":"2022-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48136169","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-01-22DOI: 10.1080/00194506.2022.2026259
S. Mahalik, A. Sheik, B. Dash, C. K. Sarangi, K. Sanjay
ABSTRACT The awareness of the depletion of high grade ore is of paramount importance now-a-days for all the metallurgical industries and researchers. For the conservation of resources, processing of low and lean grade ores is very much essential. Moreover, the recycling and reuse of the secondaries must be the core strength in that context. The spent catalyst obtained from a petroleum refinery was having 20.33% WO3 and 49.14% Al2O3 as major part of the matrix. The spent catalyst was devolatilized at 650°C to remove the oils, organics and other volatile matter. The devolatilized spent catalyst was processed treated with 8% NaOH at 90°C for 3 h to dissolve tungsten as sodium tungstate. The W bearing liquor was treated with H2SO4 to precipitate tungstic acid at pH 1.0. and subsequent production of tungsten trioxide by roasting at 700°C and tungsten metal with 99.91% purity by reduction roasting by H2 gas has also been reported. The alkali leached residue was leached with 10% sulphuric acid at 80°C for 2 h so as to extract nickel and later on precipitated as nickel hydroxide. GRAPHICAL ABSTRACT
{"title":"Reclamation of tungsten from spent HDS catalyst: a detailed study","authors":"S. Mahalik, A. Sheik, B. Dash, C. K. Sarangi, K. Sanjay","doi":"10.1080/00194506.2022.2026259","DOIUrl":"https://doi.org/10.1080/00194506.2022.2026259","url":null,"abstract":"ABSTRACT The awareness of the depletion of high grade ore is of paramount importance now-a-days for all the metallurgical industries and researchers. For the conservation of resources, processing of low and lean grade ores is very much essential. Moreover, the recycling and reuse of the secondaries must be the core strength in that context. The spent catalyst obtained from a petroleum refinery was having 20.33% WO3 and 49.14% Al2O3 as major part of the matrix. The spent catalyst was devolatilized at 650°C to remove the oils, organics and other volatile matter. The devolatilized spent catalyst was processed treated with 8% NaOH at 90°C for 3 h to dissolve tungsten as sodium tungstate. The W bearing liquor was treated with H2SO4 to precipitate tungstic acid at pH 1.0. and subsequent production of tungsten trioxide by roasting at 700°C and tungsten metal with 99.91% purity by reduction roasting by H2 gas has also been reported. The alkali leached residue was leached with 10% sulphuric acid at 80°C for 2 h so as to extract nickel and later on precipitated as nickel hydroxide. GRAPHICAL ABSTRACT","PeriodicalId":13430,"journal":{"name":"Indian Chemical Engineer","volume":"64 1","pages":"416 - 429"},"PeriodicalIF":1.5,"publicationDate":"2022-01-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41990296","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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