萃取精馏分离碳酸二甲酯-乙醇二元共沸物

萃取精馏分离碳酸二甲酯-乙醇二元共沸物
董营;肖颖;黄耀东;白鹏
【期刊名称】《化工进展》
【年(卷),期】2013(32)4
【摘要】Vapor-liquid equilibrium data of the systems were measured at 101.3 kPa with ethanol-DMC, DMC-furfural and ethanol-DMC-furfural in a solvent ratio of 1 : 1. It was shown that furfural can enlarge the relative volatility of ethanol and DMC, and the azeotropic point disappeared when mole fraction of furfural reached 0.25, indicating the feasibility of separating the ethanol-DMC mixture using extractive distillation with furfural as the solvent. Aspen Plus software was used to simulate the continuous extractive distillation processes of ethanol-DMC separation, and the single-column continuous extractive distillation process was preferred than the double-column process.%测定了101.3 kPa下乙醇-碳酸二甲酯(DMC)和DMC-糠醛二元体系的汽液平衡数据,以及乙醇-DMC-糠醛体系在溶剂比为1:1时的三元汽液平衡数据.结果表明,糠醛的加入可以改变乙醇和DMC 的相对挥发度,并且当糠醛的摩尔分数大于0.25时,乙醇-DMC二元物系的共沸点消失.因此,可以采用萃取精馏的方法以糠醛为溶剂分离乙醇和DMC的混合物.采用Aspen Plus软件对连续萃取精馏分离乙醇-DMC共沸物的过程进行了模拟.结果表明,单塔带侧线采出的操作方式比双塔操作方式更有优势.
【总页数】8页(P750-756,768)
【作者】董营;肖颖;黄耀东;白鹏
【作者单位】天津大学化工学院,天津300072
【正文语种】中文
【中图分类】TQ028
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