作　　者： ; ; ; ;

机构地区： 中国科学院过程工程研究所

出　　处： 《过程工程学报》 2003年第5期453-458,共6页

摘　　要： 变压精馏是分离共沸混合物的有效方法. 本文在计算机模拟和分析的基础上, 提出了加压-常压串联分离甲醇-碳酸二甲酯共沸体系的工艺方法. 采用UNIQUAC方程来表征甲醇-碳酸二甲酯二元共沸体系的气液平衡. 根据实验数据,回归了该热力学模型中的交互作用参数,模型的计算结果与实际数据吻合. 模型的适用范围为:压力0.1～1.5 MPa, 温度337～440 K. 基于平衡级模型,对加压精馏塔进行了模拟计算, 分析了各主要操作参数对分离效率、产品纯度及操作费用的影响. 在对加压-常压串联流程模拟的基础上,得到了最佳分离操作工艺参数. 模拟结果对工业过程的设计和改造具有一定的指导意义. Separation of dimethyl carbonate (DMC) and methanol (MeOH) is very difficult due to the azeotrope of DMC and MeOH, the pressure swing method is an effective method for separation of DMC and MeOH azeotrope. In this paper, a joint process of high-pressure distillation and atmospheric distillation was investigated. Binary interaction parameters of the UNQUAC model between MeOH and DMC were regressed against experimental data of vapor liquid equilibria of MeOH and DMC, the applicable range of the model is: pressure 0.1~1.5 MPa, temperature 337~440 K. Based on the thermodynamic model, the separation flowsheet, inclnding a high-pressure distillation column and an atmospheric distillation column in series, was simulated and analyzed. Sensitivity of operation factors was discussed and the optimum operation parameters were proposed. The optimal parameters of the high-pressure distillation column were as follows: stage number 40, feed stage 29, reflux ratio 7~10, operation pressure 1.0~1.5 MPa.

关 键 词： 碳酸二甲酯 甲醇 共沸物 加压分离 气液平衡 流程模拟

领　　域： [化学工程]