【作者】 吴军；

【导师】 白鹏；

【作者基本信息】 天津大学 ， 制药工程， 2007， 硕士

【摘要】 本文提出并研究了一种新型的间歇精馏操作过程——全回流间歇精馏串联操作。该操作方法是在间歇精馏动态累积操作以及多塔串联连续精馏操作的基础上提出来的。该方式运用全回流的操作方式,使分离效率得到充分发挥,而用多塔间液相周期性交换的方式实现多塔串联,使串联操作简化,而且可以根据分离要求来增加塔的个数,是一种有很大发展潜力和应用前景的操作技术。本文进行了全回流间歇精馏串联的实验研究。采用两种相对挥发度均较小的物系:乙醇-异丙醇、乙苯-对二甲苯各自在两个塔串联和三个塔串联的条件下进行研究。本文对全回流间歇精馏串联过程的模拟计算进行了研究,将精馏塔分成冷凝器、塔体、塔釜几部分进行物料衡算,将模拟过程分为全回流浓缩、塔间交换以及无回流充液三个阶段,结合两点隐含法与θ校正法求解。考察了双塔系统和三塔系统中各个塔塔顶、塔釜的温度变化以及各个塔塔顶轻组分浓度的变化趋势。本文以乙醇-异丙醇、乙苯-对二甲苯两种体系分别进行了双塔和三塔系统的实验研究,通过实验所得数据证明该新型操作的可行性。并根据本文建立的数学模型,对两种不同相对挥发度的物系乙醇-异丙醇、乙苯-对二甲苯体系在两塔串联和三塔串联情况下进行了模拟计算,结果表明模拟计算数据与实验数据吻合较好。更多还原

【Abstract】 This paper proposed and studied a new operation—The cascaded total reflux batch distillation. This method was proposed on the basis of batch distillation with dynamic accumulation and continuous rectification in mode of columns in series. This new mode used the total reflux operation to make full use of the separation efficiency, and the mode of periodic liquid material exchange made the operation of columns in series come true. This new method can add columns according to the requirement of separation. As a whole, this new operation is a very promising operation and can be applied widely.In this paper, the experimental study investigated a cascaded total-reflux batch distillation. Two mixtures which have low relative volatilities, ethanol-isopropanol alcohol and ethylbenzene-p- xylene have been used in the systems with two columns and three columns.This paper provided a simplified mode to simulate a process of total reflux batch distillation in mode of periodic liquid material exchange between columns . Material balance equations of reboiler, trays, condenser were studied and the simulation used two-point implicit method andθcorrector method. The trends of top and bottom temperatures of each column and concentration of each top product with time were investigated.The experiments of two columns in series and three columns in series proved the feasibility of this new operation. According to the model we set up, this paper computed the two mixtures on the conditions of two columns and three columns. The comparison of model predictions of two mixtures with different relative volatilities with experimental results showed that the results of simulation and experiment were close agreeable.更多还原