反应精馏合成甲基丙烯酸甲酯工艺优化及节能

Two processes, conventional reactive distillation (RD) processes combining reaction and separation unit, and the distillation column coupled with side reactors (SRC) processes, were explored for the reactive distillation process for the synthesis of methyl methacrylate, by the equal mole ratio of methacrylic acid and methanol, in this study. At the MAA mole flow of 10 kmol/h and the conversion efficiency of 98.6%, the optimal operating conditions for minimizing the total annual cost (TAC) were determined via the Aspen Plus sequential iterative optimization procedure. The above two techniques were simulated and optimized in terms of the minimization of the total annual cost and the CO₂ emission. The results showed that SRC process had significant advantages, and comparing with RD process, TAC can be reduced by 8.5%, CO₂ emission can be reduced by 16.3%. The minimum TAC was 115.23 million yuan per year under the optimal operating conditions, which included SRC column stages of 26, reactors of 3, side reactors (R1/R2/R3) feed location at the 6th, 11th, and 14th trays respectively, the SRC tower side line that entered the side reactors (R2/R3) feed locations at the 23rd and 24th trays, respectively, and the MeOH distribution ratio of the three side reactors (R1/R2/R3) was at 0.58:0.22:0.2.