变压精馏与膜分离组合技术分离四氢呋喃-水工艺的模拟与优化

Separation of THF-water by Pressure Swing Distiliation and Membane SeparationCombination Technology Process Simulation and Optimization

四氢呋喃脱水回收是化工行业非常常见的工艺处理装置,变压精馏、萃取精馏等在国内有广泛的应用。膜分离处理四氢呋喃脱水在装置能耗、产品纯度及收率具有优势,但独立的膜分离装置处理装置负荷波动、原料组成波动及产出产品纯度等方面能力较差。因此将变压精馏与膜分离组合技术可在装置运行能耗、产品质量保证、装置的负荷抗波动性等方面均有优势。本文通过Aspen Plus流程模拟软件对四氢呋喃脱水变压精馏与膜分离组合工艺流程建立稳态模型,运用灵敏度分析工具,研究精馏塔塔顶压力、回流比等重要操作参数对装置能耗、产品纯度、收率等进行模拟分析,优化操作参数后,四氢呋喃与水的共沸物实现较好的分离效果,装置能耗较双塔变压精馏降低25%,四氢呋喃产品纯度达到99.99%。

Dehydration and recovery of tetrahydrofuran is a very common process treatment device in the chemical industry.Pressure swing rectification and extractive distillation are widely used in China.Membrane separation treatment of THF dehydration has advantages in terms of device energy consumption,product purity and yield,but independent membrane separation devices have poor capabilities in handling device load fluctuations,raw material composition fluctuations,and output product purity.Therefore,the combined technology of pressure swing rectification and membrane separation can have advantages in terms of energy consumption in device operation,product quality assurance,and load fluctuation resistance of the device.A steady-state model was established for THF dehydration pressure swing rectification and membrane separation combined process using Aspen Plus process simulation software,and sensitivity analysis tools were used to study the influence of important operating parameters such as distillation tower top pressure and reflux ratio on the energy consumption of the device and the product.Purity,yield,etc,were simulated and analyzed.After optimizing the operating parameters,the azeotrope of tetrahydrofuran and water achieved a better separation effect,and the energy consumption of the device was reduced by 25%compared with the traditional double-tower pressure swing distillation.The purity of tetrahydrofuran reached 99.99%.