A novel reactive distillation process with side feed added to side reactors for methylal production was proposed, in which a certain proportion of feed methanol was added directly to side reactors. The process simulation and optimization of major operation parameters were carried out by using software Aspen Plus, distillation column was simulated by using the strictly computational model RADFRAC and reactors were simulated by using NRTL equation. The effect of feeding mode and the feeding rate of methanol were investigated. The simulation results show that the mass ratio of methylal and the conversion of formaldehyde can reach 0. 977 and 99. 4% respectively when methanol is added only to the side reactor closest to the top of the column and the feed rate of methanol is 1. 25% of the total amount of fed methanol. Compared with the ordinary method, the purity of methylal increased by 1. 2% and the conversion of formaldehyde increased by 1. 3% . Also, the energy consumption of the condenser and the reboiler decreased by 2. 2% and 3. 1% respectively.%提出了一种具有背包进料的背包式反应精馏生产甲缩醛的新工艺,将部分甲醇直接加入到背包反应器中.应用过程模拟软件Aspen Plus对工艺过程进行了模拟计算,采用RADFRAC严格计算模型模拟精馏塔部分,采用NRTL方程模拟反应器部分,重点考察了进料方案和甲醇进料量对新工艺过程的影响.模拟结果表明,当仅在最靠近塔顶的背包反应器中加入甲醇且甲醇进料量为甲醇总进料量的1.25％时,甲缩醛产品的质量分数能够达到0.977,甲醛的转化率能够达到99.4％.与普通的背包式反应精馏方式相比,甲缩醛产品的质量分数提高了1.2％,甲醛的转化率提高了1.3％,冷凝器能耗和再沸器能耗分别降低了2.2％和3.1％.
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