摘要
Abstract
Vacuum batch distillation experiments and simulation studies were conducted on a mixture of 1,4-butanediol(BDO)containing the acetal reactions.The experiments investigated the effects of operating pressure and reflux ratio on the removal efficiency of key impurities,2-(4-hydroxybutyloxy)-tetrahydrofuran(BGTF)and γ-butyrolactone(GBL).Based on the impurity non-conservation such as BGTF,it was speculated that there was an acetal formation reaction during the distillation process.The vapor-liquid equilibrium data of BDO and the main impurity BGTF were measured at 3-10kPa,and the binary interaction parameters were regressed using the universal quasi-chemical model(UNIQUAC).A batch reactive distillation model was established,and kinetic parameters for the formation of reaction products,including 2-hydroxytetrahydrofuran(2-HTHF),BGTF,and GBL,were optimized.Based on these parameters,the effects of operating pressure and reflux ratio on the separation performance were calculated by Aspen.The results showed that when the operating pressure was in the range of 3-5kPa,the separation factor of BDO-BGTF was larger,and increasing the reflux ratio significantly improved the removal efficiency of BGTF.However,as the operating pressure increased,the effect of the reflux ratio on BGTF removal gradually diminished.When the operating pressure increased to 10kPa,an increase in the reflux ratio led to a decrease in BGTF removal efficiency.In conclusion,the best distillation effect was achieved under the conditions of 3kPa and reflux ratio of 10:1.When the extraction ratio was 0.24,the content of BDO product was 99.65％,which met the requirements of qualified products.At this time,the removal rates of impurities BGTF and GBL were 88.30％and 85.37％,respectively.关键词
真空间歇精馏/1,4-丁二醇/2-(4-羟基丁基氧)-四氢呋喃/汽液平衡/缩醛反应/模拟/优化Key words
vacuum batch distillation/1,4-butanediol/2-(4-hydroxybutyloxy)-tetrahydrofuran/vapor-liquid equilibria/acetal reaction/simulation/optimization分类
化学化工
