膜科学与技术

碱性季胺聚砜膜制备及其催化酯交换反应的研究

作者：石文英，李红宾，孙茂文，秦龙威

单位： 1. 河南工程学院纺织学院，郑州，河南，450007；2. 河南工程学院纺织新产品开发河南省工程实验室，郑州，河南，450007

关键词：生物柴油；聚砜；碱性膜；季胺化；酯交换反应

出版年,卷(期):页码： 2018,38(2):80-85

摘要：

以聚砜（PSF）为原材料，通过氯烷基化和季胺化后浇铸成膜，进一步进行碱化处理制备碱性聚砜膜。采用红外光谱表征聚砜膜的化学结构，并将此碱性季胺聚砜膜用于催化大豆油酯交换反应制备生物柴油。考察并优化了原料油中含水率、共溶剂种类、共溶剂添加量以及醇油质量比对酯交换反应转化率的影响。研究结果表明，在醇油摩尔比9:1，碱性聚砜膜用量为油重的2wt%，反应时间1h，正己烷添加量未油重的50wt%，反应温度65℃，大豆油转化率达到最大值95.2%。当原料油中的含水率≤5 wt%时，碱性季胺聚砜膜可以吸收原料油中的水分，原料油中的水分对酯交换反应影响较小。碱性季胺聚砜膜重复使用5次后，酯交换反应转化率没有明显下降。

In this work, A a quaternized alkalinealkalization polysulfone (PSF) membrane frompolysulfone (PSF) as the substrateused for catalysis of transesterification reaction was developed prepared by successive processes of alkylation, quaternary amination and alkylation of PSF. The grafting of polysulfone was characterized by Infrared Spectroscopy. The quaternized alkalization polysulfone membrane was used to catalyze the transesterification of soybean oil for biodiesel. The effects of water content, the kinds of co-solvents, the amount of co-solvent and the molar ratio of methanol/soybean oil on the conversion of transesterification were studied and optimized. The experimental results showed that the conversion of soybean oil reached the maximum value of 95.2% under the reaction condition: the molar ratio of methanol/soybean oil of 9:1, the amount of alkaline polysulfone membrane of 2wt% (weight of soybean oil) , the reaction time of 1h, the amount of n-hexane of 50wt% (weight of soybean oil) and the reaction temperature of 65℃. When the water content of soybean oilwas below 5 wt%, the quaternized alkalization polysulfone membrane could absorb the water in soybean oil, and the water had few effectson the transesterification reaction. After the reuse of the quaternized alkalization polysulfone membrane for 5 times, transesterification conversion did not decrease significantly.

第一作者简介：石文英（1984-），女（汉），山西大同市人，博士，副教授。研究方向：催化膜及膜反应器。电话：0371-67718851。E-mail:shiwenyinggg@126.com。

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