【摘要】 为了开发乙烯气相氧化制备醋酸乙烯酯清洁生产技术,建立了生产100kt/a醋酸乙烯酯(VAc)并副产1.9kt/a乙醛的工艺流程。该工艺采用多效减压蒸发技术高效回收醋酸,变温吸附技术脱除二氧化碳中乙烯与水,并采用热泵精馏、低供热源变压吸收以及换热网络集成优化等方法,降低系统能耗。模拟研究表明,利用分子筛吸附提纯将二氧化碳作为工业原料利用可减少碳排放46.8%,全厂换热网络优化节约能耗18.8%,热泵精馏技术节约能耗57.5%,低供热源变压吸收节约解吸能耗54.9%。建立的新模拟工艺流程综合能耗降低0.142吨标准煤(tce/t),较标准先进值低40%。更多还原

【Abstract】 In order to develop a clean production technology for the preparation of vinyl acetate by gas-phase oxidation of ethylene, a simulation process with an annual output 100 kt/a of vinyl acetate（VAC） and by-product 1.9 kt/a of acetaldehyde was established. Multi-effect vacuum evaporation was adopted to recover acetic acid efficiently. The carbon dioxide could be effectively recovered by temperature swing adsorption to remove both ethylene and water. The energy consumption was effectively decreased by the application of heat pump assisted distillation, pressure swing absorption with low heat source and heat exchange networks. The simulation results showed that the carbon emission was reduced by 46.8% using the purification of CO₂ with the molecular sieve adsorption. The energy consumption of 18.8% was saved by the optimization of heat exchange networks of the system device. At the same time, the energy consumption was also saved by about 57.5% and 54.9%, respectively, by the application of heat pump assisted distillation and pressure swing absorption with low heat source techniques. The comprehensive energy consumption was 0.142 tce/t, which was 40% lower than the advanced value.更多还原