间壁塔萃取精馏制取植物油抽提溶剂的研究

Preparation of solvents for extraction of vegetable oils using dividing wall extractive distillation column

针对植物油抽提溶剂萃取精馏系统存在的萃取剂结焦问题展开研究,分析了萃取剂结焦的原因,提出了间壁塔萃取精馏制取植物油抽提溶剂的思路,并应用工艺模拟软件对比了间壁塔萃取精馏工艺和常规精馏工艺。模拟结果表明,间壁塔主塔合适的理论塔板数为30,侧线塔塔板数为10,剂油比为1.1(体积比),侧线采出位置为第27块板。与常规两塔精馏相比,再沸器热负荷降低约10%,冷凝器热负荷降低15%,且设备投资也有所减少。

The coking problems of the solvents for extraction of vegetable oils in the extractive distillation process have been studied. The reason caused coking of the solvents is analyzed. The method using dividing wall extractive distillation column to produce solvents for extraction of vegetable oils is proposed. The process simulation software is applied to compare the dividing wall extractive distillation columns with the traditional distillation ones. The simulation results show that, the optimum operating parameters for dividing wall extractive distillation column are shown as follows： 30 of theoretical plates in main column, 1.1 （ volume ratio） of extractant to oil,lateral line discharging plate at 27th plate of the main column. In comparison with direct sequence of conventional distillation, the re-boiler duty and condenser duty of the dividing wall extractive distillation column are reduced by 10% and by 15 %, respectively. The capital investment is decreased as well.