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Selective combination in multiple neural networks prediction using independent component regression approach 独立分量回归方法在多神经网络预测中的选择性组合
Pub Date : 2017-09-10 DOI: 10.3329/CERB.V19I0.33772
See Lee Foon, N. A. Rahim, A. Zainal, Zhang Jie
Biological processes are highly nonlinear in nature and difficult to represent accurately by simple mathematical models. However, this problem can be solved by using neural network. Neural network is a prominent modeling tool especially when it comes to intricate process such as biological process. In this paper, a multiple single hidden layer with ten hidden neurons Feedforward Artificial Neural Network (FANN) was used to model the complex and dynamic relationships between the input (dilution rate, D) and outputs (conversion, y and dimensionless temperature value, ?) for the reactive biological process. Levenberg-Marquardt Backpropagation training method was used. The multiple neural networks predicted outputs were then combined through three different methods which area simple averaging, Principal Component Regression (PCR) and Independent Component Regression (ICR). Multiple neural networks which were created by the bootstrap approach help improved single neural network performance as well as the model robustness for nonlinear process modeling. Comparison was made between the three methods. The result showed that ICR is slightly superior between the three methods especially in noise level 1,2 and 3, however ICR slightly suffer in noise level 4 and 5. This is due to the independent component regression used the latent factors and non-Gaussian distribution of y and ? values for the combination. Chemical Engineering Research Bulletin 19(2017) 12-19
生物过程在本质上是高度非线性的,很难用简单的数学模型来精确地表示。而利用神经网络可以解决这一问题。神经网络是一种突出的建模工具,特别是在涉及复杂过程如生物过程时。本文采用具有10个隐藏神经元的多个单隐藏层前馈人工神经网络(FANN)对反应性生物过程的输入(稀释率D)和输出(转化率y和无因次温度值?)之间的复杂动态关系进行建模。采用Levenberg-Marquardt反向传播训练方法。然后通过面积简单平均、主成分回归(PCR)和独立成分回归(ICR)三种不同的方法对多个神经网络的预测结果进行组合。采用自举方法构建的多个神经网络不仅提高了单个神经网络的性能,而且提高了非线性过程建模的鲁棒性。对三种方法进行了比较。结果表明,ICR在噪声1级、2级和3级上略优,而在噪声4级和5级上略差。这是由于独立分量回归使用了潜在因素和非高斯分布的y和?组合的值。化工研究通报19(2017)12-19
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引用次数: 0
Molecular Dynamic Simulation of CO2 Absorption into Mixed Aqueous Solutions MDEA/PZ CO2在混合水溶液中吸收的分子动力学模拟
Pub Date : 2017-09-10 DOI: 10.3329/CERB.V19I0.33771
N. Harun, E. E. Masiren
The mixture of amine absorption process is an approach for mitigation of carbon dioxide (CO 2 ) from flue gas that produces from power plant. Several experimental and simulation studies have been undertaken to understand this process but the mechanism of CO 2 absorption into the aqueous blended amines such as MDEA/PZ is not well understood and available knowledge within the open literature is limited. The aim of this study is to investigate the intermolecular interaction of the blended MDEA/PZ using Molecular Dynamics (MD) simulation. MD simulation was run under condition 313 K and 1 atm. The thermodynamic ensemble used were 200 ps for NVE and 1 ns for NVT. The periodic boundary is used to visualize the interaction of molecules of the whole system. The simulation method also involved calculation of force field and time integration algorithm.The results were interpreted in terms of Radial Distribution Function (RDF) analysis. It was observed that the hydroxyl group (–OH) of MDEA is more attracted to water molecule compared to amino group (–NH) of MDEA. The intermolecular interaction probability of –OH and –NH group of MDEA with CO 2 in blended MDEA/PZ is higher than using pure MDEA. This finding shows that PZ molecule act as an activator to promote the intermolecular interaction between MDEA and CO 2 .Thus, blend of MDEA with PZ is expecting to increase the absorption rate of CO2 and reduce the heat regeneration requirement. Chemical Engineering Research Bulletin 19(2017) 1-11
混合胺吸收工艺是缓解电厂烟气中二氧化碳排放的一种方法。为了了解这一过程,已经进行了几项实验和模拟研究,但对MDEA/PZ等水相混合胺吸收CO 2的机制尚不清楚,公开文献中可用的知识也有限。本研究的目的是利用分子动力学(MD)模拟研究混合MDEA/PZ的分子间相互作用。MD仿真在313 K和1atm条件下进行。使用的热力学系综为NVE的200 ps和NVT的1 ns。周期边界用于可视化整个系统中分子的相互作用。仿真方法还涉及到力场的计算和时间积分算法。结果用径向分布函数(RDF)分析进行解释。结果表明,MDEA的羟基(- OH)比氨基(- NH)更容易被水分子吸引。在混合MDEA/PZ中,MDEA - OH和- NH基团与co2的分子间相互作用概率高于纯MDEA。这一发现表明PZ分子作为活化剂促进了MDEA与CO2的分子间相互作用,因此PZ与MDEA共混有望提高CO2吸收率,降低热再生需求。化工研究通报19(2017)1-11
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引用次数: 9
Assessment of Membrane Bioreactor in Treating Spent Sulfidic Caustic Wastewater: Effects of Organic Biomass Concentration and Solid Retention Time 膜生物反应器处理硫酸烧碱废废水的效果评价:有机生物质浓度和固体停留时间的影响
Pub Date : 2017-09-10 DOI: 10.3329/CERB.V19I0.33803
N. S. A. Mutamim, Z. Z. Noor
This paper presents a study on the performance of an Aerobic Submerged u-shaped membrane bioreactor (ASMBR) in treating sulfidic spent caustic (SSC) in terms of mixed liquor suspended solid (MLSS) concentration and solid retention time (SRT). SSC wastewater is categorized as high strength wastewater and consists of high inorganic and organic matter. U-shape membrane bioreactors have a higher tendency to foul compared to other types of MBR. MLSS concentration and SRT are the major parameters when operating membrane bioreactor. In this study, COD removal recorded reduction of more than 95% for average MLSS concentration runs and 90% for SRTs runs. Meanwhile, sulfide was removed 99%, and formed up to 79% of sulfate. The biofouling for MLSS concentration and SRTs were observed through TMP rate change and TMP average performance, TMP trend and SMP and EPS trends. Biocake layer and biolayer deposited on membrane surface was found influenced by biomass, the inert particulate biomass products accumulating in the reactor. Chemical Engineering Research Bulletin 19(2017) 102-110
研究了好氧u型膜生物反应器(ASMBR)处理含硫废碱(SSC)的混液悬浮固体(MLSS)浓度和固体停留时间。SSC废水属于高强度废水,由高无机物和有机物组成。与其他类型的MBR相比,u型膜生物反应器具有更高的发霉倾向。MLSS浓度和SRT是膜生物反应器运行的主要参数。在本研究中,COD去除率记录了平均MLSS浓度运行降低95%以上,srt运行降低90%以上。同时,硫化物被去除99%,形成高达79%的硫酸盐。通过TMP速率变化、TMP平均性能、TMP趋势、SMP和EPS趋势观察MLSS浓度和srt的生物污染情况。发现生物炭层和沉积在膜表面的生物层受生物质的影响,惰性颗粒生物质产物在反应器中积累。化工研究通报19(2017)102-110
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引用次数: 5
Effect of Coagulation Bath Temperature During Preparation of PES Hollow Fiber Supported Liquid Membrane for Acetic Acid Removal 混凝浴温度对制备PES中空纤维支撑液膜除乙酸效果的影响
Pub Date : 2017-09-10 DOI: 10.3329/CERB.V19I0.33805
S. Sanmugam, N. Harruddin, S. M. Saufi
Acetic acid is a byproduct of acid hydrolysis of biomass during sugar recovery step in biofuel production. Acetic acid can inhibit the enzyme used during fermentation of sugar to the ethanol. Hollow fiber supported liquid membrane (SLM) was used in this study to remove acetic acid from aqueous solution. Liquid membrane was formulated using trioctylamine and 2-ethyl hexanol as a carrier and solvent, respectively. The hollow fiber membrane support was prepared from 15 wt.% polyethersulfone, 42.5 wt.% polyethyleneglycol 200 and 42.5 wt.% dimethylacetamide. The effect of coagulation bath temperature (CBT) at 30 o C, 40 o C and 50 o C during hollow fiber membrane spinning process was investigated. The porosity of the membrane increased as the CBT increased. The porosity of the membrane prepared using CBT of 30oC, 40 o C and 50 o C were 35.7%, 46.7% and 61.6%, respectively. SLM process using hollow fiber membrane prepared at 50oC of coagulation bath was able to remove 52% of acetic acid from the aqueous solution. Chemical Engineering Research Bulletin 19(2017) 118-122
醋酸是生物燃料生产中糖回收过程中生物质酸水解的副产物。醋酸可以抑制糖发酵成乙醇过程中使用的酶。采用中空纤维支撑液膜(SLM)去除水溶液中的乙酸。以三辛基胺为载体,以2-乙基己醇为溶剂配制液膜。以15wt .%聚醚砜、42.5 wt.%聚乙二醇200和42.5 wt.%二甲基乙酰胺为原料制备中空纤维膜载体。研究了30℃、40℃和50℃凝固浴温度对中空纤维膜纺丝工艺的影响。膜的孔隙率随CBT的增加而增加。采用30℃、40℃和50℃的CBT法制备的膜的孔隙率分别为35.7%、46.7%和61.6%。在50℃的混凝浴条件下制备中空纤维膜,采用SLM工艺可去除水溶液中52%的乙酸。化工研究通报19(2017)118-122
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引用次数: 6
Optimization of Flooded Soil Recovery via Plant- Arbuscular Mycorrhizal Fungi Symbiotic Interaction 植物-丛枝菌根真菌共生互作优化淹水土壤恢复
Pub Date : 2017-09-10 DOI: 10.3329/CERB.V19I0.33798
Nor Hazwani Aziz, N. Zainol, N. Thangaperumal, N. Zahari
Flooded soil recovery was optimized using experimental design methodology by manipulating the symbiotic relationship between soil fungi, Arbuscular Mycorrhizal Fungi (AMF) and the host plant (Allium cepa L.) planted in a soil containing AMF (SA). This was achieved by measuring the amount of nutrient (nitrogen, phosphorus and potassium) uptake by AMF using HACH spectrophotometer after 14 days of planting in several condition suggested by Design-Expert® software (Ver 7.1.6). In order to determine the optimum condition for the AMF to recover the flooded soil, the experiments were designed according to a central composite design in two variables following the Response Surface Methodology (RSM). A quadratic polynomial model was generated to predict soil recovery. R2 for nitrogen, phosphorus and potassium was found at 0.89, 0.96 and 0.94 respectively of the range for the factors studied namely 24-32 ml water content and 4.0-6.0 cm depth of soil. Among two parameters, depth of soil showed significant effect on the recovery of flooded soil for phosphorus and potassium while for nitrogen both parameters showed insignificant effect. Model validation experiments showed good correspondence between experimental and predicted values at error for N, P, and K at 7.0%, 1.86% and 2.65% respectively. The optimal condition for soil recovery was at 28 ml soil water content and 5 cm soil depth. At this condition, the nutrient uptake by AMF was predicted to be at their maximum rate where the concentration of nutrients increased approximately by 2 to 3 times from the initial nutrient concentration.
采用试验设计方法,通过调节土壤真菌、丛枝菌根真菌(AMF)与寄主植物葱(Allium cepa L.)在含AMF (SA)土壤中的共生关系,优化水淹土壤恢复效果。这是通过在Design-Expert®软件(版本7.1.6)建议的几种条件下种植14天后,使用HACH分光光度计测量AMF对养分(氮、磷和钾)的吸收量来实现的。为了确定AMF恢复淹水土壤的最佳条件,采用响应面法(RSM)的双变量中心复合设计进行试验设计。建立了二次多项式模型来预测土壤恢复。在24 ~ 32 ml含水量和4.0 ~ 6.0 cm土壤深度范围内,氮、磷、钾的R2分别为0.89、0.96和0.94。其中,土壤深度对淹水土壤中磷、钾恢复的影响显著,而对氮恢复的影响不显著。模型验证实验结果表明,N、P、K的误差预测值与实验值吻合较好,分别为7.0%、1.86%和2.65%。土壤恢复的最佳条件为土壤含水量28 ml,土壤深度5 cm。在此条件下,当养分浓度较初始浓度增加约2 ~ 3倍时,预测AMF对养分的吸收达到最大速率。
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引用次数: 0
A Review of Rare Earth Mineral Processing Technology 稀土选矿技术综述
Pub Date : 2017-09-10 DOI: 10.3329/CERB.V19I0.33773
L. Suli, W. Ibrahim, B. A. Aziz, M. R. Deraman, N. Ismail
The recent technological advancement has made the rare earth elements (REEs) more significant and they in turn have facilitated the culmination of more new technological applications owing to their unique physical and chemical properties. In this regard, renewable energy applications such as wind turbine and hybrid cars testify to the increasing demands on permanent magnet in the future. Considering such increasing demands on REEs, it is felt necessary to identify alternative producers of REEs outside of China as one of the measures to create a fair competition and control the price on the market. It is worth highlighting that the separation of rare earth can be both complex and challenging owing to similar properties which are shared by them. The purpose of this paper is to comprehensively review and summarize the rare earth processing routes, the mostly employed rare earth separation methods, supply and demand of rare earth around the world and some possible scenarios in rare earth market. This review has critically looked into a few authors‘ recent reviews on six major processes of rare earth processing steps and each step is considered as important to produce both high quality and better quantity of REEs. Chemical Engineering Research Bulletin 19(2017) 20-35
最近的技术进步使稀土元素更加重要,由于其独特的物理和化学性质,它们反过来又促进了更多新技术应用的高潮。在这方面,风力涡轮机和混合动力汽车等可再生能源应用证明了未来对永磁体的需求日益增加。考虑到对稀土的需求不断增加,认为有必要确定中国以外的其他稀土生产商,作为创造公平竞争和控制市场价格的措施之一。值得强调的是,稀土的分离既复杂又具有挑战性,因为它们具有相似的特性。本文的目的是全面回顾和总结稀土的加工路线、主要采用的稀土分离方法、全球稀土的供需情况以及稀土市场可能出现的一些情况。本文批判性地回顾了一些作者最近对稀土加工步骤的六个主要过程的评论,每个步骤都被认为是生产高质量和更好数量的稀土的重要步骤。化工研究通报19(2017)20-35
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引用次数: 102
Factorial Experimental Design for Biobutanol Production from Oil Palm Frond (OPF) Juice by Clostridium Acetobutylicum ATCC 824 乙酰丁酸梭菌ATCC 824从油棕榈叶(OPF)果汁中生产生物丁醇的析因试验设计
Pub Date : 2017-09-10 DOI: 10.3329/CERB.V19I0.33774
Nur Syazana Muhamad Nasrah, M. A. K. Zahari, N. Masngut, H. Ariffin
Biobutanol is an alternative energy that can be promising as the future energy source. It can be produced from natural and renewable agriculture wastes such as oil palm frond (OPF) juice by microbes. Clostridium acetobutylicum has the ability to ferment the sugars in OPF juice as carbon source into biobutanol. This research aimed to investigate the effect of independent and interaction factors; initial pH medium (5-7), inoculum size (1-20%), initial total sugars concentration (40-60 g/L), temperature (32-42 ° C) and yeast extract concentration (1-10 g/L) on the production of biobutanol from oil palm frond (OPF) juice by C. acetobutylicum ATCC 824 using a two level half factorial design which have been developed by the Design Expert Software Version 7.1. Based on the factorial analysis, it was observed that the most significant parameter was yeast extract concentration, which contributes 8.20%, followed by inoculum size and temperature, which were contribute 7.84% and 7.56%, respectively. The analysis showed the R 2 value for the model was 0.9805 and the interaction between inoculum size and temperature gave the highest influenced to the fermentation process with contribution up to 16.31%. From the validation experiments, the experimental values were reasonable close to the predicted values with only 5.87% and 10.09% of errors. It confirmed the validity and adequacy of the predicted models. Hence, the data analysis developed from the Design Expert Software could reliably predict biobutanol yields. This study indicated that each of the factors may affect the fermentation process of the biobutanol production. Chemical Engineering Research Bulletin 19(2017) 36-42
生物丁醇是一种很有前途的替代能源。它可以通过微生物从天然和可再生的农业废物中生产,如油棕叶(OPF)果汁。乙酰丁酸梭菌具有将OPF汁中的糖作为碳源发酵成生物丁醇的能力。本研究旨在探讨独立因素和相互作用因素的影响;对C. acetobutylicum ATCC 824从油棕榈叶(OPF)果汁中生产生物丁醇的初始pH培养基(5-7)、接种量(1-20%)、初始总糖浓度(40-60 g/L)、温度(32-42℃)和酵母提取物浓度(1-10 g/L)进行了研究,采用了由design Expert Software Version 7.1开发的两水平半因子设计。因子分析结果表明,酵母浸膏浓度对产量的贡献最大,为8.20%,其次是接种量和温度,分别为7.84%和7.56%。分析表明,该模型的r2值为0.9805,接种量与温度的交互作用对发酵过程的影响最大,贡献率达16.31%。从验证实验来看,实验值与预测值较为接近,误差分别为5.87%和10.09%。验证了预测模型的有效性和充分性。因此,设计专家软件开发的数据分析可以可靠地预测生物丁醇产量。本研究表明,每种因素都可能影响生物丁醇的发酵过程。化工研究通报19(2017)36-42
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引用次数: 1
Empty Fruit Bunch (EFB) Gasification In An Entrained Flow Gasification System 带流气化系统中的空果束气化
Pub Date : 2017-09-10 DOI: 10.3329/CERB.V19I0.33775
W. Ismail, R. A. Rasid
Biomass has become one of the most commonly used renewable sources of energy in the last two decades. Empty fruit bunch (EFB) is one of the examples for the biomass that is used as a renewable energy source. From the palm oil processing industry, only 10% are the final products such as palm oil and palm kernel oil, while the remaining 90% are harvestable biomass waste in the form of EFB, palm kernel shell (PKS) and oil palm frond (OPF). This overload amount of biomass waste will cause an abundance of waste which will also affect the environment. To convert EFB into usable energy in ways that are more efficient, less polluting, and economical, gasification has merge as one of the most favorable technological innovations in synthesis gas (syngas) production. The main aim of this work is to study the EFB gasification in an entrained flow gasification process based on the different operating temperature (700 ° C to 900 ° C) and equivalence ratio, ER (0.2 – 0.4), evaluated based on the production of gases such as hydrogen (H 2 ), carbon monoxide (CO), carbon dioxide (CO 2 ) and methane (CH 4 ). It was found that as the temperature was increased from 700 ° C to 900 ° C, the production of H 2 and CO 2 increased while CO was decreased. The optimum ER value of 0.30 was found to attain the highest Cold Gas Efficiency (CGE) value of 74.03% at 900°C. Chemical Engineering Research Bulletin 19(2017) 43-49
在过去的二十年中,生物质已成为最常用的可再生能源之一。空果束(EFB)是将生物质用作可再生能源的一个例子。从棕榈油加工业中,只有10%是棕榈油和棕榈仁油等最终产品,而其余90%是EFB,棕榈仁壳(PKS)和油棕榈叶(OPF)形式的可收获生物质废物。这种过量的生物质废物将导致大量的废物,这也将影响环境。为了以更高效、更少污染和更经济的方式将EFB转化为可用能源,气化已成为合成气生产中最有利的技术创新之一。本研究的主要目的是在不同操作温度(700°C至900°C)和等效比ER(0.2 - 0.4)的基础上研究夹带流气化过程中的EFB气化,并根据氢气(h2)、一氧化碳(CO)、二氧化碳(CO 2)和甲烷(ch4)等气体的产生进行评估。结果表明,当温度从700℃升高到900℃时,h2和CO的生成量增加,CO的生成量减少。在900℃时,最佳ER值为0.30,可获得74.03%的最高冷气效率(CGE)。化工研究通报19(2017)43-49
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引用次数: 3
Effect of Oscillation Amplitude on the Residence Time Distribution for the Mesoscale Oscillatory Baffled Reactor 振荡振幅对中尺度振荡折流板反应器停留时间分布的影响
Pub Date : 2017-09-10 DOI: 10.3329/CERB.V19I0.33804
H. W. Yussof, S. Bahri, A. Phan, Ap Harvey
A recent development in oscillatory baffled reactor technology is down-scaling the reactor, so that it can be used for the applications such as small-scale continuous production of bioethanol. A mesoscale oscillatory baffled reactor (MOBR) with central baffle system was developed and fabricated at mesoscales (typically 5 mm diameter). This present work aims to analyse the mixing conditions inside the MOBR by evaluating the residence time distribution (RTD) against the dynamic parameters of net flow Reynolds number ( Re n ) at 4.2, 8.4 and 12.6 corresponding to flow rates of 1.0, 2.0 and 3.0 ml/min respectively, oscillatory Reynolds number ( Re o ) between 62 to 622, and Strouhal number ( Str ) between 0.1 to 1.59. The effect of oscillation frequency and amplitude on RTD performance were studied at frequency, amplitude, and velocity ratio ranging from 4 to 8 Hz, 1 to 4 mm and 1 to 118, respectively. Effect of oscillation frequency has resulted in the variance of the RTD increased as the oscillation frequency increased from 5 Hz to 8 Hz and peak at 6 Hz of 0.264. A further increase in the frequency above 5 Hz caused the RTD to slightly broaden and positively skewed. At frequency of 5 Hz, the RTD profiles were close to Gaussian form for all tested amplitude values from 1 mm to 4 mm. At low amplitudes, i.e. xo = 1 mm, the variance exhibited its minimum around 0.842 at Re o =156. An increase in Re o above 300 resulted in increased in the variance rapidly to 1.28, and later eliminated the plug flow behaviour and the reactor behaved similar to a single continuous stirred tank reactor. Chemical Engineering Research Bulletin 19(2017) 111-117
振荡折流板反应器技术的一项最新进展是缩小反应器的规模,使其能够用于诸如小规模连续生产生物乙醇等应用。研制了一种中尺度振荡折流板反应器(MOBR),该反应器具有中央折流板系统。本文的目的是通过评估停留时间分布(RTD)来分析MOBR内部的混合条件,净流雷诺数(Re n)分别为4.2、8.4和12.6,对应的流速分别为1.0、2.0和3.0 ml/min,振荡雷诺数(Re o)在62至622之间,Strouhal数(Str)在0.1至1.59之间。在频率、幅值和速度比分别为4 ~ 8hz、1 ~ 4mm和1 ~ 118时,研究了振荡频率和幅值对RTD性能的影响。振荡频率的影响导致RTD的方差随着振荡频率从5 Hz增加到8 Hz而增加,在6 Hz处达到峰值0.264。5赫兹以上的频率进一步增加导致RTD略微变宽并正偏斜。在5 Hz频率下,在1 ~ 4 mm范围内的所有测试振幅值的RTD剖面都接近高斯形式。在低振幅下,即xo =1 mm,方差在Re =156时在0.842左右达到最小值。当雷诺数增加到300以上时,方差迅速增加到1.28,随后消除了塞流行为,反应器的行为类似于单个连续搅拌槽反应器。化工研究通报19(2017)111-117
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引用次数: 2
Thermal studies on Arabic gum - carrageenan polysaccharides film 阿拉伯胶-卡拉胶多糖膜的热研究
Pub Date : 2017-09-10 DOI: 10.3329/CERB.V19I0.33800
J. Jamaludin, F. Adam, R. A. Rasid, Zulkafli Hassan
The main objective of this work is to develop film and study the thermal characteristics of polysaccharides films at various concentration of carrageenan in the mixture by calculating activation energy of polysaccharides films. There were four (4) film samples of two polysaccharides combination; arabic gum (AG) and carrageenan (C) with different formulations; sample A, sample B, sample C and sample D prepared. Sample A film is the control sample that contained only arabic gum and distilled water (DI) with 40% weight arabic gum per volume DI water (w/v%). Meanwhile for sample B and C were prepared with concentration 40 w/v% of Arabic gum and two differents of carrageenan concentrations; 1 w/v% and 10 w/v% respectively. Polyethylene glycol 400 (PEG 400) as a plasticiser was added into sample D film. The sample films were thermally characterized using differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) under nitrogen atmosphere. The major thermal transitions as well as, activation energies of the major decomposition stages were determined. Sample A and B films exhibited the highest (112.43 kJ/mol) and the lowest (102.89 kJ/mol) activation energy of thermal decomposition, respectively. The activation energies were lower at larger amounts of sulfate groups from carrageenan on the degradation reactions. The DSC trend for all samples shows two (2) major intense peaks recorded in the DSC thermograms; an endothermic transition at temperature around 100 ° C and followed by an exothermic transition at temperature around 300 ° C. The endothermic transition is due to the heat absorption for dehydration of water, H2O and the decomposition of samples process. Meanwhile, the exothermic transition is caused by the formation of H 2 O, CO and CH 4 in polysaccharide film from dehydration, depolymerisation and decomposition at the high-temperature stages. Chemical Engineering Research Bulletin 19(2017) 80-86
本研究的主要目的是通过计算多糖膜的活化能,研究多糖膜在不同浓度卡拉胶混合物下的热特性。两种多糖组合的膜样有4个;不同配方的阿拉伯胶(AG)和卡拉胶(C);制备样品A,样品B,样品C和样品D。样品A是只含有阿拉伯胶和蒸馏水(DI)的对照样品,每体积DI水的阿拉伯胶重量为40% (w/v%)。样品B和C分别以40 w/v%的阿拉伯胶和两种不同浓度的卡拉胶配制;1 w/v%和10 w/v%。将聚乙二醇400 (PEG 400)作为增塑剂加入到样品D膜中。采用差示扫描量热法(DSC)和热重分析(TGA)在氮气气氛下对样品膜进行了热表征。测定了主要热解阶段的热转变和活化能。样品A和B的热分解活化能最高(112.43 kJ/mol),最低(102.89 kJ/mol)。卡拉胶中硫酸盐基团越多,反应的活化能越低。所有样品的DSC趋势显示在DSC热图中记录了两个主要的强烈峰;在100℃左右发生吸热转变,随后在300℃左右发生放热转变。吸热转变是由于水、H2O脱水和样品分解过程中的吸热作用。同时,多糖膜在高温阶段脱水、解聚和分解生成h2o、CO和ch4,引起放热转变。化工研究通报19(2017)80-86
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引用次数: 29
期刊
Chemical Engineering Research Bulletin
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