膜科学与技术

模拟发酵液中渗透汽化膜分离乙醇性能劣化研究

作者：曹中琦，陈宁，王庚，贾伟，张卫东

单位：北京化工大学，膜分离过程与技术北京市重点实验室，北京，100029

关键词：乙醇发酵；渗透汽化；膜劣化

出版年,卷(期):页码： 2018,38(6):22-26

摘要：

渗透汽化技术（Pervaporation，简称PV）与乙醇发酵过程耦合可将发酵液中的乙醇原位移除，从而缓解产物抑制作用，提高乙醇产率。但是发酵液中所含的物质复杂，且其对膜渗透汽化性能的影响尚无定论。本文通过在乙醇水溶液中添加葡萄糖、甘油、琥珀酸以及无机盐等发酵液中的代表性物质，考察其对乙醇透过性能的影响。结果表明无机盐、葡萄糖和甘油对PDMS膜的渗透汽化性能没有明显影响。琥珀酸容易在膜表面吸附沉积并进入膜内阻塞乙醇水的通道，使渗透通量下降7%，是导致发酵-渗透汽化耦合过程中膜劣化的主要物质。琥珀酸、葡萄糖和甘油的协同作用使PDMS膜的渗透通量下降11.2%。

Pervaporation integrated with ethanol fermentation process was applied to overcome the product inhibition by removing ethanol from fermentation broth. However, the component of fermentation broth was complex, and the effect on membrane performance was inconclusive. In this study, glucose, glycerol and succinic acid was added to the ethanol aqueous solution to investigate the effect on ethanol permeation performance. Experimental results show that effects of salts, glucose and glycerol on the PDMS membrane performance were not obvious. Succinic acid was easy to adsorb on the membrane surface and into the membrane to block the ethanol water channel, which result in a 7% decrease of flux. Therefore, succinic acid was the main component that result in the membrane degradation in the fermentation/PV process. The flux of PDMS membrane decrease 11.2% result from the cooperative organization of succinic acid, glucose and glycerol.

第一作者简介：曹中琦（1990-），男，辽宁省锦州市人，博士研究生，研究方向为膜材料与膜分离过程，E-mail：caozqmembr@163.com 通讯作者，Email：zhangwd@mail.buct.edu.cn

参考文献：

[1] Esfahanian M, Rad A S, Khoshhal S, et al. Mathematical modeling of continuous ethanol fermentation in a membrane bioreactor by pervaporation compared to conventional system: Genetic algorithm[J]. Bioresource technology, 2016, 212: 62-71.
[2] Canabarro N I, Alessio C, Foletto E L, et al. Ethanol production by solid-state saccharification and fermentation in a packed-bed bioreactor[J]. Renewable Energy, 2017, 102: 9-14.
[3] 章克昌.酒精与蒸馏酒工艺学[M].中国轻工业出版社，1995.
[4] Freeman A, Woodley J M, Lilly M D. In situ product removal as a tool for bioprocessing[J]. Biotechnology, 1993, 11:1007-1012.
[5] Vane L M. A Review of Pervaporation for Product Recovery From Biomass Fermentation Process[J]. Journal of Chemical Technology & Biotechnology, 2006, 80(6):603-629.
[6] Aroujalian A, Belkacemi K, Davids S J, et al. Effect of residual sugars in fermentation broth on pervaporation flux and selectivity for ethanol[J]. Desalination, 2006, 193(1): 103-108.
[7] García M, Sanz M T, Beltrán S. Separation by pervaporation of ethanol from aqueous solutions and effect of other components present in fermentation broths[J]. Journal of chemical technology and biotechnology, 2009, 84(12): 1873-1882.
[8] Chovau S, Gaykawad S, Straathof A J J, et al. Influence of fermentation by-products on the purification of ethanol from water using pervaporation[J]. Bioresource Technology, 2011, 102(2):1669-74.
[9] Qureshi N, Meagher M M, Huang J, et al. Acetone butanol ethanol (ABE) recovery by pervaporation using silicalite–silicone composite membrane from fed-batch reactor of Clostridium acetobutylicum[J]. Journal of Membrane Science, 2001, 187(1): 93-102.
[10] 李志强, 费本华, 江泽慧. 发酵抑制物对葡萄糖发酵产乙醇的影响[J]. 化工进展, 2015, 34(a01):80-84.
[11] Palmqvist E, Grage H, Meinander N Q, et al. Main and interaction effects of acetic acid, furfural, and p-hydroxybenzoic acid on growth and ethanol productivity of yeasts.[J]. Biotechnology & Bioengineering, 2015, 63(1):46-55.
[12] Zhang W, Yu X, Yuan Q. Ethanol fermentation coupled with complete cell recycle pervaporation system: Dependence of glucose concentration[J]. Biotechnology Techniques, 1995, 9(4):299-304.
[13] Shabtai Y, Chaimovitz S, Freeman A, et al. Continuous ethanol production by immobilized yeast reactor coupled with membrane pervaporation unit[J]. Biotechnology & Bioengineering, 1991, 38(8):869-76.
[14] 陈世平,樊森清,汤晓玉,等.乙醇发酵渗透汽化耦合过程的细胞生长动力学[J].酿酒科技, 2015 (11): 9-13.
[15] Li J, Polka H M, Gmehling J. A gE model for single and mixed solvent electrolyte systems: 1. Model and results for strong electrolytes[J]. Fluid Phase Equilibria, 1994, 94: 89-114.
[16] Bowen T C, Meier R G, Vane L M. Stability of MFI zeolite-filled PDMS membranes during pervaporative ethanol recovery from aqueous mixtures containing acetic acid[J]. Journal of Membrane Science, 2007, 298(1–2):117-125.

服务与反馈：

【文章下载】【加入收藏】

《膜科学与技术》编辑部地址：北京市朝阳区北三环东路19号蓝星大厦邮政编码：100029 电话：010-64426130/64433466 传真：010-80485372邮箱：mkxyjs@163.com