生物丁醇分离技术的研究进展及发展趋势

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。

Current advances and development of bio-butanol separation techniques

Biobutanol (n-butanol) is an important bulk chemical and biofuel candidate, which can be obtained via acetone-butanol-ethanol (ABE) fermentation from biomass. Because of the low concentration of solvents products, the conventional biobutanol separation is costly and energy-intensive. To overcome the above limitation, recently, alternative separation techniques are emerged. In this review, the current advances of the potential alternative separation techniques, including the vapor-liquid equilibrium, solvents polarity-based techniques and membrane-based separation for biobutanol recovery are summarized, followed by discussing the multi-stage cascade separations. Facing the generation of commercial guide biobutanol production, the trends for ABE distillation is also included. With the improvement of separation technology and the development of biorefinery process, the overall cost of biobutanol production can be decreased, which would further improve the competitiveness of biobutanol process in terms of commercialization.