化学循环分离煤基乙二醇联产碳酸丁烯酯工艺研究

Study on process for separation of coal-based ethylene glycol with co-production of 1,2-butylene carbonate by chemical-looping technology

为解决酯交换法合成五元环状碳酸丁烯酯的原料短缺以及煤制乙二醇产品精制过程中乙二醇与1,2-丁二醇共沸物难以分离的瓶颈问题,基于化学循环分离技术与反应精馏技术提出了耦合集成工艺,将碳酸-1,2-丁烯酯的合成与乙二醇/1,2-丁二醇的分离过程耦合集成于同一工艺中同时完成,在此基础上建立了集成工艺的全流程模拟模型,并通过灵敏度分析对该耦合工艺的设计与操作参数进行优化,研究结果为煤基乙二醇生产过程分离高纯度乙二醇同时联产碳酸1,2-丁烯酯耦合工艺的开发奠定了基础。

1,2-Butylene carbonate( BC) is an important five-membered cyclic carbonate with high commercial value.But there is a shortage of 1,2-butanediol( 1,2-BDO),raw material for BC production by transesterification.While1,2-BDO is the byproduct in coal-to-ethylene glycol( EG) route,which brings about the puzzle in separation with EG.Based on chemical-looping technology and reactive distillation technology,an integrated process is proposed innovatively to achieve the separation of EG and 1,2-BDO while continuously producing 1,2-BC. On this basis,the whole process simulation model for the integrated process is established,and the design and operation parameters of the integrated process are optimized through sensitivity analysis. The research results lay the foundation for process development in factory.