离子液体催化苯与长链烯烃烷基化的反应-分离过程集成

Process Integration for the Alkylation of Benzene with 1-Dodecene Using Ionic Liquid as Catalyst

针对室温氯铝酸盐离子液体催化烷基化反应间歇过程的不足,从反应体系特性出发,设计了一套可以在反应区原位分离离子液体与反应混合物的连续搅拌釜反应器,使离子液体不与潮湿空气接触,大大提高了其性能稳定性,单位质量催化剂处理的反应物量达到315 cm3/g.cat,大大高于90 cm3/g.cat的文献值.为了解决离子液体催化苯与十二烯烷基化这一液—液两相界面反应系统能够实现连续、高效反应与分离的问题,研发了一整套小型中试装置,离子液体在反应器内迅速混合乳化、高效反应,从反应器流出的离子液体与反应混合物能有效分离,离子液体与反应混合物的再循环量可以独立调节,特别是原位补铝方法,使单位质量离子液体高效地处理反应混合物的容量又得到进一步显著提高,达到1 755 cm3/g.cat.

The acidic chloroaluminate ionic liquid is moisture-sensitive. When [-BMIM] [-AlCl4] ionic liquid was used as catalyst for benzene alkylation with 1-dodecene, the lifetime was always rather short in batch reaction mode because of the unavoidable contacting with moisture. From this, a longer lifetime was attained in a revised continuous flow reactor resulted from the realization of in-situ separation for ionic liquid from reactants. The through put of chloroaluminate ionic liquid was elevated to 315 cm^3/g cat （90 cm^3/g, cat of batch mode in reference）. Then, a continuous small pilot mixing-reacting-separating-recycling setup was constructed, by which the fast mixing and continuous separation of ionic liquid with reactants were realized. The recycling rate of ionic liquid and reactants can be controlled respectively. Especially, the in-situ A1 compensation to recycling chloroaluminate ionic liquid can massively increase the throughput of chloroaluminate ionic liquid to 1 755 cm^3/g. cat.