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介绍了三种双效精馏方案的工艺流程,在此基础上针对年产10万吨PVA装置产生的醇解液采用Aspen开展了流程模拟工作。模拟结果表明,采用三种双效精馏方案的能耗依次为23.000GCal/h、23.979GCal/h和24.500GCal/h,均能降低能耗44%以上。采用气相采出甲醇相比液相甲醇能够节约冷凝热负荷约18 GCal/h,相应降低聚合一塔釜热负荷约18GCal/h。方案三通过将部分回收塔稀甲醇送入回收四塔,增大了釜排量,避免了釜液中必须含甲醇的限制条件,从而可以保证TQ503塔釜水中不含醋酸钠,可以节省大量工艺水。从降低能耗,减少三废排放的角度综合考虑,方案三是较优的甲醇精制方案。
The process flow of the three double-effect rectification schemes is introduced. Based on this, flow simulation is carried out using Aspen for the alcoholysis solution produced by an annual output of 100,000 tons of PVA devices. The simulation results show that the energy consumption of three double-effect rectification schemes are 23.000GCal / h, 23.979GCal / h and 24.500GCal / h respectively, which can reduce the energy consumption by more than 44%. Methanol gas phase extraction compared to liquid phase methanol can save condensing heat load of about 18 GCal / h, corresponding to reduce the polymerization of a tower heat load of about 18GCal / h. Scenario 3 through the part of the recovery tower dilute methanol into the recovery of the four towers, increasing the tank displacement, to avoid the kettle solution must contain methanol restrictions, which can ensure TQ503 tower kettle water does not contain sodium acetate, can save a lot of technology water. From the perspective of reducing energy consumption and reducing emission of waste products, the third solution is the better methanol refining solution.