abe发酵蒸汽渗透分离耦合实验研究化学工程与技术专业论文.docxVIP

北京化工大学硕士学位论文模拟液实验，并将其与无填充的PDMS膜进行对比。通过电子扫描 北京化工大学硕士学位论文 模拟液实验，并将其与无填充的PDMS膜进行对比。通过电子扫描 电镜、原子力显微镜、接触角测试、溶胀度测定等表征手段观察膜的 表面形貌和内部结构。系统考察了二氧化硅填充量、料液浓度、料液 温度等条件对二氧化硅填充PDMS膜蒸汽渗透性能的影响。结果表 明二氧化硅填充膜的表面粗糙度、疏水性和溶胀度较纯PDMS膜都 有大幅提高，同时二氧化硅填充PDMS膜对丁醇和丙酮的分离选择 性也有大幅提高，当二氧化硅填充量为3叭％时膜对丁醇和丙酮的分 离选择性达到最大值，丁醇／水和丙酮／水的分离因子分别为48和67， 较无填充的PDMS膜分别提高了55％和24％，但膜的渗透通量也由 3309·m2-h。下降到1439·m-2．h～。 最后将二氧化硅填充PDMS膜应用于ABE发酵．蒸汽渗透原位分 离耦合过程，考察膜对真实ABE发酵液体系的分离效果，以及对ABE 发酵产率和葡萄糖消耗速率的影响。结果表明ABE间歇发酵后期产 物对丙酮丁醇梭菌产生明显抑制作用，通过耦合蒸汽渗透分离过程可 以有效减轻产物抑制作用。ABE间歇发酵一蒸汽渗透分离耦合过程葡 萄糖消耗速率由0．429·L-1．h‘1提高到了0．779·L1．h～，ABE总时空产率 也由O．159·L-1．h。1提高到0．369·L-1．h～，相比间歇发酵提高了一倍。相 比间歇发酵过程，流加发酵过程ABE总产量由1 3．69·L．1提升到 37．69．L～。 关键词：ABE发酵；蒸汽渗透；原位分离技术；PDMS膜 万方数据 ABSTRACTEXPERIMENTAL ABSTRACT EXPERIMENTAL INVESTIGATION OF ABE FERMENTATION八17=f～POR PERME』钔[’IoN PROCESS ABSTRACT ABE toxicity iS one of the most critical problems of ABE fermentation which eventually results in low ABE fermentation yield and high production cost．In order to alleviate the problem of ABE toxicity,in situ product recovery techniques have been widely used to improve the fermentation performance．Pervaporation(PV)have been be integrated with ABE fermentation process．Nevertheless，the fermentation broth directly contacts with th．e membrane in pervaporation—fermentation coupling process，which lead to serious membrane fouling and limit its industrial application．To solve the problem of serious membrane fouling in the pervaporation process，vapor permeation(VP)is proposed to integrate with ABE厶—1 l”llk6．．1”I+tl。2+t；lU“lnl as an ISPR technique in this work．Since the VP technology is put forward，this technology has received extensive attention of people because of its economy．VP is an alternative membrane technique，the feed of VP is clean vapor,not the broth．VP technology not only has the characteristics of pervaporation technology,it also can effectively avoid the concentration polarization and membrane fouling of PV process．Therefore，the performance of VP—fermentation couplin