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生物基（正）丁醇是一种重要的化学品和替代燃料,其主要制备途径为糖质底物的丙酮-丁醇-乙醇（ABE）发酵。受制于发酵副产物多、溶剂浓度低、产物共沸等因素,传统的生物丁醇分离过程存在分离能耗大、成本高等问题,制约其产业化制备。为解决生物丁醇分离的技术瓶颈,近年来,应用新型分离技术实现与ABE发酵过程的耦合成为研究的热点。本文综述了生物丁醇分离技术的最新研究进展,讨论了基于汽液平衡、相转移、膜分离技术等新型分离方式的技术特点;并针对多级分离级联系统开发、面向终产物的精馏技术的新趋势、新特点进行剖析和讨论。随着分离技术的发展和进步、生物炼制工艺开发和集成,生物丁醇的制备成本可望进一步降低,提升市场竞争力。 相似文献
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选择短流程漂白技术对有机酸法玉米秸秆皮浆(OABCSRP)进行漂白,研究了碱处理(E)、压力H2O2(PO)和H2O2(P)及其组合漂白工艺对OABCSRP浆特性的影响。结果表明,碱处理对OABCSRP浆脱木素选择性高,是后续漂白的重要基础,当用碱量4.0%时,浆的得率为95.4%、脱木素率为23.5%、黏度为115 mPa.s、亮度为44.2%;短流程E(PO)漂白可作为中高白度文化用纸浆料的漂白,在E段用碱量4.0%、PO段H2O2用量为2.0%时,可获得得率87.6%、黏度53.5 mPa.s、亮度79.9%的漂白浆,E(PO)漂白浆具有较好的打浆和纸张性能;短流程E(PO)P漂白在H2O2总用量为2.5%时,可获得得率为86.4%、黏度为59.6 mPa.s、亮度为82.7%的漂白浆。 相似文献
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Eduardo Ximenes Cristiane S. Farinas Alberto C. Badino Michael R. Ladisch 《Biofuels, Bioproducts and Biorefining》2021,15(2):563-573
Major progress in the bioprocessing of lignocellulose to fuels and value-added chemicals has created the possibility of a low carbon-footprint economy. However, the current complexity and associated costs of lignocellulose conversion result in a higher price for ethanol than for fossil fuels. The cost of cellulosic ethanol production will be lowered by further progress in development of biorefinery technology that produces both ethanol and high-value chemicals with bio-based products that are beginning to penetrate consumer markets in the USA, Brazil, and worldwide. The cost-effectiveness of low carbon-footprint bioproducts will benefit from advances in supplying large amounts of biomass solids to the biorefinery. We describe here outcomes from a successful long-term international cooperation between the Laboratory of Renewable Resources Engineering (LORRE) at Purdue University in the United States and Brazil's Agricultural Research Corporation (EMBRAPA) and Federal University of São Carlos (UFSCar), which has contributed practical pathways to enhance the biorefinery concept. This paper gives an overview of developments that address fundamental knowledge of lignocellulosic biomass pretreatment hydrolysis under optimized operational conditions and bioreactor configurations, and the science and engineering that contributes to the effective production of fuel and ethanol and value-added products from biomass. © 2020 Society of Chemical Industry and John Wiley & Sons, Ltd 相似文献
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Ajay Shah Ashish Manandhar Matthew J. Darr 《Biofuels, Bioproducts and Biorefining》2021,15(3):793-803
Corn stover is predominantly used as the feedstock in the cellulosic biorefineries of the Midwestern USA; however, there are several opportunities to improve the performance of its supply chain. Thus, there is a need to optimize the corn stover supply system for the overall sustainability of the corn stover-based industries. This paper presents three practical strategies that could be implemented in the near term to improve the performance of the corn stover supply chain. The first strategy involves reducing the corn stover collection area, which entails improving producers’ participation through enhanced knowledge transfer related to this industry, improving harvest ratio of biomass, and reducing dry matter loss during biomass handling and storage. The second strategy involves reducing the overall bale supply quantity, which primarily entails increasing bale density. The final suggested strategy involves reducing quantities of in-field machinery, which is possible through improving the efficiency of field machinery, including windrowers, balers, and stackers, and increasing their harvest durations. By successfully implementing these strategies, the overall cost associated with the supply of corn stover, energy use, and greenhouse gas emissions could be reduced, on an average, by 34–35% from the current average benchmarks of $95.9/metric ton (t), 11% and greenhouse gas emissions is 58.4 kg CO2e/t, respectively. This can contribute toward creating a cost-effective logistics system that is also environmentally sustainable. This will be critical for the long-term success of the biorefineries using corn stover as the primary feedstock. © 2021 Society of Chemical Industry and John Wiley & Sons, Ltd 相似文献
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Anuj K. Chandel Marcus B.S. Forte Igor S. Gonçalves Thais S. Milessi Priscila V. Arruda Walter Carvalho Solange I. Mussatto 《Biofuels, Bioproducts and Biorefining》2021,15(4):1190-1208
Transitioning from gasoline and petroleum-based products to biofuels and green chemicals is a paradigm shift that will lead to the development of the bioeconomy. In this sense, the role of biorefineries in countries like Brazil is very important as the country generates a huge amount of second generation (2G) biomass every year and also has an attractive consumable market. However, technological innovations are still required to unleash the fullest potential of biomass conversion to biofuels and biochemicals, although successful examples are already a reality. For example, Amyris Inc. has developed renewable products for cosmetics (squalene), healthcare (artemisinin), and flavors / fragrances, and Suzano Papel e Celulose has developed sustainable technologies for the production of pulp and paper, and lignin-derived adhesives (Ecolig). First-generation ethanol in Brazil is an established source of transportation fuel but 2G ethanol production with low production costs is still a challenge at commercial scale, and companies like Raízen and GranBio continue making efforts to improve the economic feasibility of the adopted processes. In this context, the RenovaBio Policy launched by the Federal Brazilian Government in December 2017 aims to boost the production and utilization of biofuels and green chemicals in the country. Considering the matters mentioned above, this paper discusses the Brazilian biorefinery developments, technological advances, and current industrial scenario for the production of biofuels and chemicals. © 2021 Society of Industrial Chemistry and John Wiley & Sons Ltd. 相似文献
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Well‐known wood‐pulping processes are optimized on the generation of cellulose while other constituents like hemicelluloses and lignin become denatured during treatment excluding their higher valuable utilization as compounds. The main objective of the joint project Lignocellulose Feedstock Biorefinery (2007–2009) was the development of a sustainable, integrated process for treatment and component separation of domestic lignocellulosic raw material, such as beech and poplar. All components (extracts, cellulose, hemicelluloses, and lignin) should be fractionized and conserved in a form, which allows further processing (biotechnological and/or chemical) for the generation of added‐value products from each fraction. Pre‐treatment and component separation on the basis of the OrganoSolv pulping process could be optimized in 1‐kg‐scale for the demands of the biorefinery and successfully transferred to a continuous process in 10‐kg‐scale with solvent recovery. Pre‐treatments and component separations in ionic liquids are possible, but economically they are not competitive. The results of the techno‐economic and ecological assessment showed that it is possible to run a lignocellulose feedstock biorefinery with a capacity of about 400 000 t/a wood in an economically and environmentally sound way. A conceptual design of a pilot plant was generated. Its realization and operation will become part of a follow‐up project proposal. Copyright © 2010 Society of Chemical Industry and John Wiley & Sons, Ltd 相似文献
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Cheng Zhong Ying‐Xiu Cao Bing‐Zhi Li Ying‐Jin Yuan 《Biofuels, Bioproducts and Biorefining》2010,4(3):326-342
Energy security and environmental stress force China to seek and develop biofuels as a substitute of fossil energy. Meanwhile, China has great potential to provide a large quantity of feedstocks for biofuel production due to its vast amount of non‐food crops, such as tuberous crops, sweet sorghum, cellulosic biomass, and algae. Recently, the study and the industrial‐scale production of biofuels, particularly, fuel ethanol and biodiesel, have progressed remarkably in China as a result of government preferential policies and funding supports. We have briefly reviewed the historical development of biofuels in China with special emphasis on current feedstock utilization and process technology development. The bottlenecks of utilizing various feedstocks have also been analyzed and the prospects for future biofuel development in China have been explored. Biorefineries integrating reliable, low‐cost and sufficient non‐food feedstock supplies with highly efficient, environmentally friendly process technologies could sustain a bright future for biofuel development in China. Copyright © 2010 Society of Chemical Industry and John Wiley & Sons, Ltd 相似文献
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Kaige Wang Longwen Ou Tristan Brown Robert C. Brown 《Biofuels, Bioproducts and Biorefining》2015,9(2):190-200
Dried distillers grains with solubles (DDGS) are potential feedstocks for the production of hydrocarbon fuels and chemicals from catalytic pyrolysis. This study evaluates the economic feasibility of a 2000‐metric‐ton‐corn‐per‐day integrated biorefinery with an add‐on facility processing corn DDGS to hydrocarbons. In addition to ethanol, the integrated facility would produce a wide range of hydrocarbons, including aromatics, olefins, and synthetic gasoline and diesel. The hydrocarbon products command a substantially higher market value than that of the pre‐processed DDGS: $109 million per year vs. $78 million per year. The add‐on DDGS conversion facility contributes an extra $152 million of capital investment compared with the stand‐alone corn ethanol production scenario. The operating costs for the integrated scenario are also higher than for the stand‐alone scenario, mainly due to increases in utilities, labor costs, and capital depreciation. The minimum fuel selling price (MFSP) for the integrated scenario is $2.27/gallon, which is comparable to the MFSP of $2.18/gallon for the stand‐alone scenario. Sensitivity analysis shows that the feedstock cost, hydrocarbon yield, and fixed capital investment have the greatest impacts on the MFSP. With the benefit of products diversity, the proposed integrated corn biorefinery may be competitive with conventional stand‐alone ethanol production. © 2014 Society of Chemical Industry and John Wiley & Sons, Ltd 相似文献