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Finding values in lignin: A promising yet under-utilized component of the lignocellulosic biomass 发现木质素的价值:一种有前途但未充分利用的木质纤维素生物质成分
Q4 Chemical Engineering Pub Date : 2022-11-29 DOI: 10.3389/fceng.2022.1059305
Vidhisha Jassal, Chang Dou, Ning Sun, Seema Singh, B. Simmons, Hemant Choudhary
This article outlines the technical and economic potentials of lignin in unlocking sustainable biorefineries. The benefits of using this highly functionalized biopolymer for the growth of sustainable economy have been highlighted. But practically, the possibility of commercially substituting petroleum oil with lignin is still not very high as the estimated biofuel production cost is 2–3 times higher than the former one. However, with the advancement in technology and more efficient measures by biorefineries such as storing and processing the biomass near the field so as to reduce the transportation cost, it is possible to gain higher profits. Companies like Domtar, Stora Enso, Borregaard’s LignoTech, VITO, and Chemelot InSciTe have been promoting commercial value of lignin. The growth of lignin market after the start-up production at various sites has been discussed in this review. Combining the complete “start-to-finish” analysis with economic evaluation gives a pragmatic overview of the possibilities whether lignin will join petroleum oil as an efficient and cost-effective renewable source.
本文概述了木质素在解锁可持续生物炼制中的技术和经济潜力。使用这种高度功能化的生物聚合物对可持续经济增长的好处已经得到强调。但实际上,木质素在商业上替代石油的可能性仍然不是很高,因为估计生物燃料的生产成本比前者高2-3倍。然而,随着技术的进步和生物精炼厂采取更有效的措施,如储存和处理靠近现场的生物质,以降低运输成本,有可能获得更高的利润。像Domtar、Stora Enso、borreggaard的LignoTech、VITO和Chemelot institute这样的公司一直在推广木质素的商业价值。本文讨论了各地木质素生产启动后木质素市场的增长情况。将完整的“从头到尾”分析与经济评估相结合,给出了木质素是否将加入石油作为一种高效且具有成本效益的可再生能源的可能性的务实概述。
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引用次数: 0
Membrane distillation crystallization for water and mineral recovery: The occurrence of fouling and its control during wastewater treatment 膜蒸馏结晶用于水和矿物回收:污水处理过程中结垢的发生及其控制
Q4 Chemical Engineering Pub Date : 2022-11-29 DOI: 10.3389/fceng.2022.1066027
Indira Chimanlal, L. Nthunya, C. Quist-Jensen, H. Richards
Membrane distillation crystallization (MDC) is an emerging technology envisaged to manage challenges affecting the desalination industry. This technology can sustainably treat concentrated solutions of produced water and industrially discharged saline wastewater. Simultaneous recovery of clean water and minerals is achieved through the integration of crystallization to membrane distillation (MD). MDC has received vast research interest because of its potential to treat hypersaline solutions. However, MDC still faces challenges in harnessing its industrial applications. Technically, MDC is affected by fouling/scaling and wetting thereby hindering practical application at the industrial level. This study reviews the occurrence of membrane fouling and wetting experienced with MDC. Additionally, existing developments carried out to address these challenges are critically reviewed. Finally, prospects suggesting the sustainability of this technology are highlighted.
膜蒸馏结晶(MDC)是一种新兴技术,旨在应对影响脱盐行业的挑战。该技术可以可持续地处理采出水的浓缩溶液和工业排放的含盐废水。通过将结晶与膜蒸馏(MD)相结合,实现了清洁水和矿物的同时回收。MDC因其处理高盐溶液的潜力而受到广泛的研究兴趣。然而,MDC在利用其工业应用方面仍然面临挑战。从技术上讲,MDC受到污垢/结垢和润湿的影响,从而阻碍了工业层面的实际应用。本研究回顾了MDC所经历的膜污染和润湿的发生。此外,还认真审查了为应对这些挑战而进行的现有发展。最后,强调了这项技术可持续性的前景。
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引用次数: 3
Inhibition of cellulase activity by liquid hydrolysates from hydrothermally pretreated soybean straw 大豆秸秆水热预处理液对纤维素酶活性的抑制作用
Q4 Chemical Engineering Pub Date : 2022-11-21 DOI: 10.3389/fceng.2022.1004240
Daehwan Kim, Anqi Ji, Armoni L. Jackson, Bailee Brown, Youngmi Kim, S. Kim, C. Laufer, Drew Ferrier, C. Yoo
The one-pot biomass conversion process is a promising strategy to minimize potential product loss and reduce processing costs. However, this strategy has technical limitations due to the inhibitory effects of biomass components like lignin as well as the generated inhibitors (e.g., furans, phenols) during biomass processing. In this study, the inhibitory effects of liquid hydrolysates formed by hydrothermal pretreatment of soybean straw with either sodium hydroxide (NaOH) or hydrogen peroxide (H2O2) on cellulolytic enzyme activity were investigated. Hydrothermal pretreatment of soybean straw (10% w/v) was carried out with either sodium hydroxide (1% v/v) or hydrogen peroxide (1% v/v) at 121°C for 60 min to evaluate the effect of water-soluble inhibitors released from soybean pretreatment on cellulolytic enzyme activity. The fraction of cellulose in pretreated solids (1% w/v glucan) was enzymatically hydrolyzed for 72 h with 45 IU/g glucan (corresponding to 25 mg enzyme protein/g glucan) in the presence of either buffer or liquid hydrolysate generated from the pretreatments. Hydrolysis of NaOH and H2O2 pretreated solids resulted in 57% and 39% of glucose yields in buffer, respectively. In the presence of the liquid hydrolysates, NaOH and H2O2 pretreated biomass showed 20% and 30% glucose yield, respectively, indicating the enzyme suppression by inhibitors in the liquid hydrolysates. Of the enzyme activities in hydrolysates tested, NaOH hydrolysate showed a higher inhibitory effect on enzyme activities (mainly β-glucosidase) compared to H2O2 liquid, where enzyme deactivation has a first-order correlation and the manner in which the vacuum-filtered inhibitors were generated from pretreated soybean straw.
一锅生物质转化工艺是一种很有前途的策略,可以最大限度地减少潜在的产品损失并降低加工成本。然而,由于木质素等生物质成分以及生物质加工过程中产生的抑制剂(如呋喃、酚类)的抑制作用,该策略具有技术局限性。研究了氢氧化钠(NaOH)或过氧化氢(H2O2)水热预处理大豆秸秆形成的液体水解产物对纤维素酶活性的抑制作用。用氢氧化钠(1%v/v)或过氧化氢(1%v/v)在121°C下对大豆秸秆(10%w/v)进行60分钟的水热预处理,以评估大豆预处理释放的水溶性抑制剂对纤维素酶活性的影响。在预处理产生的缓冲液或液体水解产物存在下,用45IU/g葡聚糖(相当于25mg酶蛋白/g葡聚糖)对预处理固体中的纤维素部分(1%w/v葡聚糖)进行酶水解72小时。NaOH和H2O2预处理固体的水解导致缓冲液中葡萄糖产量分别为57%和39%。在液体水解产物存在的情况下,NaOH和H2O2预处理的生物质分别显示出20%和30%的葡萄糖产率,表明液体水解产物中的抑制剂对酶的抑制作用。在测试的水解产物中的酶活性中,与H2O2液体相比,NaOH水解产物对酶活性(主要是β-葡萄糖苷酶)表现出更高的抑制作用,其中酶失活与预处理的大豆秸秆产生真空过滤抑制剂的方式具有一级相关性。
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引用次数: 0
Progress on TiO2-based materials for solar water interfacial evaporation 二氧化钛基太阳能水界面蒸发材料研究进展
Q4 Chemical Engineering Pub Date : 2022-11-18 DOI: 10.3389/fceng.2022.1046019
Srishti, Khushi Khandelwal, Aditya Kumar, A. Sinhamahapatra
Solar water interfacial evaporation (SWIE) has attracted much attention for harvesting clean water. Over the last few decades, researchers have developed an innovative photo-thermal material for high-performance solar water interfacial evaporation. For higher evaporation performance, TiO2-based materials gain attention as a promising photo-thermal material due to their light absorption capacity. This study compared conceptual designs of TiO2-based materials for SWIE. Structural design and engineering strategies for improving evaporation rates and higher thermal conversion efficiency were reviewed. In addition, the material’s thermal stability and heat management were analyzed. This review provides an overview of the current advances in photo-thermal TiO2 materials to motivate research and translation efforts from the laboratory to large-scale solar water clean water production. Additional benefits of TiO2 materials on solar water interfacial evaporation should be investigated beyond containers to solve interconnected water, environmental, and energy progression.
太阳能-水界面蒸发(SWIE)在获取清洁水方面备受关注。在过去的几十年里,研究人员开发了一种用于高性能太阳能-水界面蒸发的创新光热材料。对于更高的蒸发性能,TiO2基材料由于其光吸收能力而作为一种有前途的光热材料而受到关注。本研究比较了用于SWIE的TiO2基材料的概念设计。综述了提高蒸发率和热转换效率的结构设计和工程策略。此外,还对该材料的热稳定性和热管理进行了分析。这篇综述概述了光热TiO2材料的最新进展,以推动从实验室到大规模太阳能水清洁水生产的研究和转化工作。除了容器之外,还应研究TiO2材料对太阳能-水界面蒸发的额外好处,以解决水、环境和能源的相互关联。
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引用次数: 0
Feature-based statistical process monitoring for pressure swing adsorption processes 基于特征的变压吸附过程统计监测
Q4 Chemical Engineering Pub Date : 2022-11-18 DOI: 10.3389/fceng.2022.1064221
Jangwon Lee, Ankur Kumar, Jesus Flores-Cerrillo, Jin Wang, Q. He
Pressure swing adsorption (PSA) is a widely used technology to separate a gas product from impurities in a variety of fields. Due to the complexity of PSA operations, process and instrument faults can occur at different parts and/or steps of the process. Thus, effective process monitoring is critical for ensuring efficient and safe operations of PSA systems. However, multi-bed PSA processes present several major challenges to process monitoring. First, a PSA process is operated in a periodic or cyclic fashion and never reaches a steady state; Second, the duration of different operation cycles is dynamically controlled in response to various disturbances, which results in a wide range of normal operation trajectories. Third, there is limited data for process monitoring, and bed pressure is usually the only measured variable for process monitoring. These key characteristics of the PSA operation make process monitoring, especially early fault detection, significantly more challenging than that for a continuous process operated at a steady state. To address these challenges, we propose a feature-based statistical process monitoring (SPM) framework for PSA processes, namely feature space monitoring (FSM). Through feature engineering and feature selection, we show that FSM can naturally handle the key challenges in PSA process monitoring and achieve early detection of subtle faults from a wide range of normal operating conditions. The performance of FSM is compared to the conventional SPM methods using both simulated and real faults from an industrial PSA process. The results demonstrate FSM’s superior performance in fault detection and fault diagnosis compared to the traditional SPM methods. In particular, the robust monitoring performance from FSM is achieved without any data preprocessing, trajectory alignment or synchronization required by the conventional SPM methods.
变压吸附(PSA)是一种广泛应用于各种领域的气体产品与杂质分离技术。由于PSA操作的复杂性,过程和仪器故障可能发生在过程的不同部分和/或步骤。因此,有效的过程监控对于确保PSA系统的高效和安全运行至关重要。然而,多床PSA工艺对过程监控提出了几个主要挑战。首先,PSA过程以周期性或循环的方式运行,永远不会达到稳定状态;其次,不同运行周期的持续时间是动态控制的,以响应各种干扰,这导致了广泛的正常运行轨迹。第三,过程监测的数据有限,床层压力通常是过程监测的唯一测量变量。PSA操作的这些关键特征使得过程监控,特别是早期故障检测,比在稳定状态下连续运行的过程更具挑战性。为了解决这些挑战,我们提出了一个基于特征的PSA过程统计过程监控(SPM)框架,即特征空间监控(FSM)。通过特征工程和特征选择,我们表明FSM可以自然地处理PSA过程监控中的关键挑战,并在广泛的正常运行条件下实现对细微故障的早期检测。利用工业PSA过程中的模拟故障和真实故障,将FSM的性能与传统的SPM方法进行了比较。结果表明,与传统的SPM方法相比,FSM在故障检测和故障诊断方面具有优越的性能。特别是,FSM的鲁棒监控性能无需传统SPM方法所需的任何数据预处理、轨迹对齐或同步。
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引用次数: 0
Experimental determination and mathematical modelling of residence time distributions by using pieces of urban art 利用城市艺术品进行停留时间分布的实验测定和数学建模
Q4 Chemical Engineering Pub Date : 2022-11-15 DOI: 10.3389/fceng.2022.1054124
T. Salmi, P. Tolvanen, K. Eränen, J. Wärnå
Residence time distribution (RTD) has a very high impact on the performance of a chemical reactor. The development of new reactor and catalyst structures has increased the importance of deep knowledge in theories of RTDs and good experimental practice in measuring RTDs in real systems. Therefore, RTD studies are included in chemical engineering education all over the world. This work demonstrates how RTDs can be measured by using urban pieces of art. Impulse experiments with an inert tracer (NaCl) were conducted in a marvelous modern artwork, ‘Flow of time’ in Turku/Åbo. The results were successfully interpreted with the classical laminar flow model. The application of the methodology in historical university cities is suggested.
停留时间分布(RTD)对化学反应器的性能有很大的影响。新的反应器和催化剂结构的发展增加了深入了解rtd理论和在实际系统中测量rtd的良好实验实践的重要性。因此,RTD研究已被纳入世界各国的化工教育中。这项工作展示了如何通过使用城市艺术品来衡量rtd。惰性示踪剂(NaCl)的脉冲实验在图尔库(Turku)的一件奇妙的现代艺术品“时间之流”中进行/Åbo。用经典层流模型对结果进行了解释。最后提出了该方法在历史大学城中的应用。
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引用次数: 0
Non-thermal plasma activated CO2 hydrogenation over K- and La- promoted layered-double hydroxide supported Ni catalysts K和La促进的层状双氢氧化物负载Ni催化剂上的非热等离子体活化CO2加氢
Q4 Chemical Engineering Pub Date : 2022-11-15 DOI: 10.3389/fceng.2022.1027167
C. Charalambous, Shanshan Xu, Sheng Ding, Sarayute Chansai, E. Asuquo, Antonio Torres Lopez, Christopher M. A. Parlett, J. Gilmour, Arthur A. Garforth, C. Hardacre
The catalytic conversion of CO2 to CH4 and CO over nickel particles supported on layered-double hydroxide (MgAl) with different metal promoters was investigated under non-thermal plasma (NTP) conditions. It has been shown that lanthanum-promoted Ni catalysts significantly enhanced the CO2 conversion in comparison to the 10Ni/MgAl catalyst (33.4% vs. 89.3%). In comparison, for the potassium-promoted catalysts, CO2 conversion is similar to that of 10Ni/MgAl but the CO selectivity increased significantly (35.7% vs. 62.0%). The introduction of La and K to Ni catalysts increased the Ni dispersion and improved the reducibility of Ni species, thus affecting CO2 conversion and product selectivity. In situ DRIFTS showed similar reaction pathways for La- and K- promoted catalysts with Ni catalysts. However, the La and K promoters significantly improved the formation of formate species on the Ni surface, facilitating CO2 conversion to useful products.
在非热等离子体(NTP)条件下,研究了不同金属助催化剂负载在层状双氢氧化物(MgAl)上的镍颗粒上CO2催化转化为CH4和CO的反应。研究表明,与10Ni/MgAl催化剂相比,镧促进的Ni催化剂显著提高了CO2转化率(33.4%对89.3%)。相比之下,对于钾促进的催化剂,CO2转化率与10Ni/MgAl相似,但CO选择性显著提高(35.7%对62.0%)。在Ni催化剂中引入La和K增加了Ni的分散性,提高了Ni物种的还原性,从而影响了CO2转化率和产物选择性。原位DRIFTS显示La和K促进的催化剂与Ni催化剂的反应途径相似。然而,La和K促进剂显著改善了甲酸盐在Ni表面的形成,促进了CO2转化为有用的产物。
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引用次数: 2
Demonstration of a three compartment solar electrolyser with gas phase cathode producing formic acid from CO2 and water using Earth abundant metals 三室太阳能电解槽气相阴极利用地球上丰富的金属从二氧化碳和水生产甲酸的演示
Q4 Chemical Engineering Pub Date : 2022-11-09 DOI: 10.3389/fceng.2022.1028811
B. Thijs, Lucas Hanssens, G. Heremans, Wauter Wangermez, J. Rongé, J. Martens
A three compartment solar formic acid generator was built using a Sn on Cu foam cathode and NiFe anode. A bipolar combination of a Fumasep FAD-PET-75 and Nafion 117 membrane was mounted between anode and middle compartment, which was filled with Amberlyst 15H ion exchanger beads. A Fumasep FAD-PET-75 membrane separated the middle compartment from the cathode. The generator was powered with a photovoltaic panel and fed with gaseous CO2 and water. Diluted formic acid solution was produced by flowing water through the middle compartment. Common PV-EC devices are operated using aqueous electrolyte and produce aqueous formate. In our PV-EC device, formic acid is produced straight away, avoiding the need for downstream operations to convert formate to formic acid. The electrolyser was matched with solar photovoltaic cells achieving a coupling efficiency as high as 95%. Our device produces formic acid at a faradaic efficiency of ca. 31% and solar-to-formic acid efficiency of ca. 2%. By producing formic acid from CO2 and water without any need of additional chemicals this electrolyser concept is attractive for use at remote locations with abundant solar energy. Formic acid serves as a liquid renewable fuel or chemical building block.
采用锡铜泡沫阴极和镍铁阳极构建了三室太阳能甲酸发生器。在阳极和中间隔间之间安装了Fumasep FAD-PET-75和Nafion 117膜的双极组合,其中填充了Amberlyst 15H离子交换珠。一层Fumasep FAD-PET-75膜将中间隔室与阴极隔开。发电机由光伏板供电,并以气态二氧化碳和水为燃料。稀释甲酸溶液是通过流动的水通过中间隔间。普通的PV-EC装置使用水性电解质并产生水性甲酸盐。在我们的PV-EC装置中,甲酸直接产生,避免了下游操作将甲酸转化为甲酸的需要。该电解槽与太阳能光伏电池相匹配,耦合效率高达95%。我们的装置产生甲酸的法拉第效率约为31%,太阳能制甲酸效率约为2%。通过从二氧化碳和水中生产甲酸而不需要任何额外的化学物质,这种电解器的概念对于在太阳能丰富的偏远地区使用是有吸引力的。甲酸可作为液体可再生燃料或化学构件。
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引用次数: 1
CAZyme from gut microbiome for efficient lignocellulose degradation and biofuel production 来自肠道微生物组的CAZyme用于有效降解木质纤维素和生产生物燃料
Q4 Chemical Engineering Pub Date : 2022-11-07 DOI: 10.3389/fceng.2022.1054242
Dixita Chettri, Susmita Nad, Ujjal Konar, A. Verma
Over-exploitation and energy security concerns of the diminishing fossil fuels is a challenge to the present global economy. Further, the negative impact of greenhouse gases released using conventional fuels has led to the need for searching for alternative biofuel sources with biomass in the form of lignocellulose coming up as among the potent candidates. The entrapped carbon source of the lignocellulose has multiple applications other than biofuel generation under the biorefinery approach. However, the major bottleneck in using lignocellulose for biofuel production is its recalcitrant nature. Carbohydrate Active Enzymes (CAZymes) are enzymes that are employed for the disintegration and consumption of lignocellulose biomass as the carbon source for the production of biofuels and bio-derivatives. However, the cost of enzyme production and their stability and catalytic efficiency under stressed conditions is a concern that hinders large-scale biofuel production and utilization. Search for novel CAZymes with superior activity and stability under industrial condition has become a major research focus in this area considering the fact that the most conventional CAZymes has low commercial viability. The gut of plant-eating herbivores and other organisms is a potential source of CAZyme with high efficiency. The review explores the potential of the gut microbiome of various organisms in the production of an efficient CAZyme system and the challenges in using the biofuels produced through this approach as an alternative to conventional biofuels.
对日益减少的化石燃料的过度开采和能源安全问题是当前全球经济面临的挑战。此外,使用传统燃料释放温室气体的负面影响导致需要寻找替代生物燃料来源,木质纤维素形式的生物质成为有力的候选者之一。木质纤维素的碳源除了在生物炼制方法下产生生物燃料外,还有多种应用。然而,使用木质纤维素生产生物燃料的主要瓶颈是它的顽固性。碳水化合物活性酶(CAZymes)是用于分解和消耗木质纤维素生物质的酶,作为生产生物燃料和生物衍生物的碳源。然而,酶生产的成本及其在压力条件下的稳定性和催化效率是阻碍大规模生物燃料生产和利用的一个问题。考虑到大多数传统的CAZymes具有较低的商业可行性,在工业条件下寻找具有优异活性和稳定性的新型CAZymes已成为该领域的主要研究重点。植食动物和其他生物的肠道是高效的CAZyme的潜在来源。这篇综述探讨了各种生物的肠道微生物组在生产高效CAZyme系统中的潜力,以及利用这种方法生产的生物燃料作为传统生物燃料的替代品所面临的挑战。
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引用次数: 1
Assessing oxygen limiting fermentation conditions for 2,3-butanediol production from Paenibacillus polymyxa 多粘菌Paenibacillus polymyxa生产2,3-丁二醇的限氧发酵条件评估
Q4 Chemical Engineering Pub Date : 2022-11-04 DOI: 10.3389/fceng.2022.1038311
Ryan J. Stoklosa, R. Latona, D. Johnston
2,3-butanediol (2,3-BDO) is a platform chemical that can be converted to a wide array of products ranging from bio-based materials to sustainable aviation fuel. This chemical can be produced by a variety of microorganisms in fermentation processes. Challenges remain for high titer 2,3-BDO production during fermentation due to several parameters, but controlling oxygen is one of the most relevant processing parameters to ensure viable product output. This work investigated the fermentation of plant biomass sugars by the 2,3-BDO producer Paenibacillus polymyxa. Aerobic and oxygen limited fermentation conditions were initially evaluated using molasses-based media to determine cell growth and 2,3-BDO output. Similar conditions were then evaluated on hydrolysate from pretreated sweet sorghum bagasse (SSB) that contained fermentable sugars from structural polysaccharides. Fermentations in molasses media under aerobic conditions found that 2,3-BDO could be generated, but over time the amount of 2,3-BDO decreased due to conversion back into acetoin. Oxygen limited fermentation conditions exhibited improved biomass growth, but only limited suppression of 2,3-BDO conversion to acetoin occurred. Glucose depletion appeared to have a greater role influencing 2,3-BDO conversion back into acetoin. Further improvements in 2,3-BDO yields were found by utilizing detoxified SSB hydrolysate.
2,3-丁二醇(2,3- bdo)是一种平台化学品,可以转化为一系列产品,从生物基材料到可持续航空燃料。这种化学物质可以由多种微生物在发酵过程中产生。在发酵过程中,由于几个参数的影响,高滴度2,3- bdo的生产仍然存在挑战,但控制氧气是确保可行产品产出的最相关的加工参数之一。本文研究了2,3- bdo产生物多粘类芽孢杆菌对植物生物质糖的发酵。用糖蜜为基础的培养基初步评估了有氧和限氧发酵条件,以确定细胞生长和2,3- bdo的产量。然后对含有结构多糖可发酵糖的预处理甜高粱甘蔗渣(SSB)的水解产物进行了类似的条件评价。在好氧条件下的糖蜜培养基中发酵发现可以生成2,3- bdo,但随着时间的推移,2,3- bdo的量由于转化回乙酰而减少。限氧发酵条件下,生物质生长得到改善,但对2,3- bdo转化为乙酰氨基酚的抑制作用有限。葡萄糖消耗似乎对2,3- bdo转化回乙酰氨基酚有更大的影响。利用解毒的SSB水解液进一步提高了2,3- bdo的产量。
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引用次数: 1
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