通过严格模拟对二氧化碳利用的评估:将二氧化碳转化为碳酸二甲酯

Evaluation of Carbon Dioxide Utilization by Rigorous Simulation: Conversion of Carbon Dioxide to Dimethyl Carbonate

通过AspenPlus流程模拟软件,采用UNIQUAC-RK热力学模型和酯交换动力学模型,对二氧化碳和甲醇生成碳酸二甲酯工艺生产流程进行模拟计算并对流程进行优化和分析,得到工艺优化的最佳操作条件。并在此基础上,以最小年度化总费用(TAC)为目标,运用变压精馏和萃取精馏两种不同的分离工艺分离甲醇和碳酸二甲酯,对实际生产提供了理论依据。结果表明,萃取精馏工艺要更优于原有的变压精馏。最后为降低能耗,又对流程进行了热集成,发现相比较原工艺,热公用工程减耗50.68%,冷公用工程减耗61.67%。

The UNIQUAC-RK thermodynamic model and UniquAC-RK kinetic model were used to simulate the process of dimethyl carbonate(DMC) formation from carbon dioxide and methanol by Aspen Plus simulation software, and the UniquAC-RK thermodynamic model and UniquAC-RK kinetic model were used to optimize the main operating parameters, and the optimum operating conditions were obtained. On this basis, methanol and dimethyl carbonate were separated by two different separation processes, variational distillation and extractive distillation, aiming at the minimum annual total cost(TAC). The results show that extractive distillation is better than variable pressure distillation. Finally, in order to reduce energy consumption, the thermal integration of the process was carried out, and it was found that compared with the original process, the consumption of the thermal utility was reduced by 50.68% and that of the cold utility was reduced by 61.67%.