关键词: 正戊烷, 共沸精馏, 甲缩醛, 甲醇, 共沸剂, 变压精馏, 能耗

Abstract:

The azeotropic distillation separation process of dimethoxymethane-methanol system was studied by selecting n-pentane as the azeotropic agent. Based on the ternary phase diagram, a conceptual designwas conducted to determine an appropriate azeotropic distillation separation process. The process was simulated and optimized using Aspen Plus simulation software, and the optimized operating conditions such as operating pressure, operating temperature, and solvent ratio were analyzed and determined. The effects of process parameters such as the number of distillation tower plates, feed position, and solvent ratio on product quality and energy consumption indicators were compared and investigated. The results show that the azeotropic distillation process using n-pentane as the azeotropic agent can efficiently separate dimethoxymethane and methanol. The mass concentration of dimethoxymethane product can reach 99%, and the recovery rate of dimethoxymethane is not less than 99.9%. Compared with conventional pressure swing distillation process, the energy consumption of azeotropic distillation process can be reduced by about 36%, which has good industrial application value.

Key words: n-pentane, azeotropic distillation, dimethoxymethane, methanol, azeotropic agent, pressure swing distillation, energy consumption