摘要:
A novel reactive distillation process integrating a distillation column with side reactors(DCSR) was proposed for the production of cyclohexyl acetate through the additive esterification of cyclohexene and acetic acid.Aimed at the reduction of the total annual cost(TAC),when the feeding rates of both cyclohexene and acetic acid were 10 kmol/h and the mass fraction of cyclohexyl acetate in the column bottom was stipulated as 99.5%(w),the effects of operating conditions and the integration structure on the esterification were investigated by means of the Aspen Plus process simulation software.The results indicated that,under the optimal DCSR process conditions of reboiler duty 0.51 MW,the stripping section plates number is 3,number of side reactors 2 and catalyst loading 2 300 kg with a distribution coefficient of 0.44/0.56,TAC was 2.82 × 106 Yuan/a,lower than that of the traditional reaction-separation process.Comparison to the traditional reactionseparation process,the reboiler duty,catalyst loading and TAC of the DCSR process decreased by 8.9%,42.5% and 18.9%,respectively.%采用“背包式”反应精馏集成(DCSR)工艺,对环己烯(CH)与乙酸(AA)加成酯化合成乙酸环己酯(CA)的反应进行研究,固定CH与AA的进料量均为10 kmol/h,规定塔釜产品中CA含量为99.5%(w),以年度总成本(TAC)为评价指标,通过Aspen Plus流程模拟软件考察了主要操作条件及集成结构对DCSR过程的影响.实验结果表明,最佳的工艺条件为:再沸器热负荷(QR)为0.51 MW、提馏段塔板数为3、侧反应器台数为2、总催化剂装填量为2 300埏kg、催化剂在上下两台侧反应器中的分配系数分别为0.44和0.56.在该条件下,集成过程具有最小TAC约2.82×106 Yuan/a,相较于传统工艺,DCSR工艺的QR减小近8.9%,催化剂用量减少了42.5%,TAC节省了18.9%.