渗透汽化法汽油脱硫用乙基纤维素膜制备工艺的优化

Preparation process optimization of crosslinked EC pervaporation membrane for gasoline desulfurization

为了进一步提高乙基纤维素（EC）膜的脱硫性能,利用光引发交联反应将丙烯酸酯单体和EC聚合物合成交联EC膜,用红外光谱仪、扫描电镜对该膜的膜结构进行了表征。采用模拟汽油评价了EC膜的脱硫性能,研究了EC质量分数、交联剂质量分数、成膜温度、脱硫温度对EC膜渗透汽化性能的影响。结果表明,随着EC质量分数和交联剂质量分数的增加,硫富集因子和通量均先增大后减小,存在极大值;随着成膜温度和脱硫温度的升高,硫富集因子逐渐降低,通量一直增加。综合考虑两者对汽油脱硫的贡献,选取EC质量分数为18%,交联剂质量分数为21%~22%,成膜温度为50℃,脱硫温度为80℃为最佳脱硫条件。

In order to further improve the desulfurization performance of ethyl cellulose（ EC） membrane,acrylate monomer and EC polymer are used to synthesize crosslinked EC membrane. The membrane structure is characterized by IR spectroscopy and scanning electron microscopy. The model gasoline is used to evaluate the desulfurization performance. The effects of solid content,crosslinking agent content and temperature on the permeation flux and enrichment factor of the membrane are investigated. The results show that higher content of EC and crosslinking agent can make both the permeation flux and enrichment factor first increased and then decreased. There is a maximum value.Increasing the membrane-forming temperature and desulfurization temperature results in the increase of the permeation flux and the gradual decrease of the enrichment factor. On the basis of the results,the optimum conditions of desulfurization are suggested as follows： 18% mass fraction of the solid content,21%- 22% mass fraction of the crosslinking agent content,50℃ of the membrane-forming temperature and 80℃ of the desulfurization temperature.