【作者】 李立硕；

【导师】 韦藤幼； 童张法；

【作者基本信息】 广西大学 ， 化学工程与工艺， 2005， 硕士

【摘要】 无水乙醇是一种性能优良的有机溶剂,广泛用于制药,涂料等行业,其传统的生产方法主要有分子筛脱水、共沸精馏、膜分离等。采用共沸精馏法生产无水乙醇具有生产连续、投资少、消耗能源品位低,产品纯度高等优点,该生产工艺目前还是工业化生产工业无水乙醇的主要方法。 但是在实际的生产中,由于共沸精馏过程对操作过程控制要求比较高,对生产条件的波动都可能使共沸点发生偏离,从而使生产要求的共沸条件遭到破坏。针对共沸法生产无水乙醇工艺,通过把共沸精馏塔上部改造为具有部分冷凝作用的精馏段,装填普通填料;部分冷凝段由于具有回流量内部自动调节、控制响应速度快、操作能耗低等优点,可使共沸精馏塔的操作弹性明显提高。 本文采用Visual C++编程,对乙醇—水—苯体系共沸精馏塔进行模拟计算,以100Kg/hr,95.57%(wt)工业乙醇进料为基准,得出最佳操作工艺参数:蒸发量为69Kg/hr,苯相回流量为58kg/hr,回流比为3,进料乙醇浓度越高,得到无水乙醇浓度越高。同时,对四个参数的灵敏度进行分析,发现进料乙醇浓度和返苯相量灵敏度较大,而加热负荷及回流比灵敏度较小。利用模拟优化得出的数据,设计并加工了一套塔径为100mm,高度更多还原

【Abstract】 Anhydrous alcohol is one kind of excellent organic solvents which was widely used in pharmaceutical and painting manufacture. Traditionally, there are several way to prepare anhydrous alcohol, such as molecular sieve dehydration, azeotropic distillation, membrane separation etc. To produce anhydrous alcohol by using azeotropic distillation have lots of merits such as continuous operation, less investment, lower energy consumption, high purity of product and so on. now It is the most popular process in anhydrous alcohol preparation. But in practical azeotropic distillation operations, a small fluctuation of operation process parameter may have great effect to the distillation’s stability which would make the azeotropic point deflected and break the working conditions of azeotropy required. During prepare anhydrous alcohol by azeotropic distillation by changing the upper part of azeotropic distillation column into a rectifying section with partially condensation section. And filled with usual packings. It has a great benefits such as reflux ratio automatic regulation, quickly response of controlling, lower energy consumption etc. the operation elasticity of azeotropic distillation column can obviously be improved.In this article, by using Visual C++ programming, simulations of ethanol-water-benzene azeotropic distillation column was carried out. By setting the feed stream flow rate as 100Kg/hr of 95.57%(wt) ethanol. After running the simulations, distillate rate at 69Kg/hr, benzene phase reflux at 58Kg/hr and reflux ratio at 3 can be achieved as the optimal operation parameters, and the higher concentration of feed ethanol, the higher concentration product we got. Besides, the four parameters’ sensibility were analyzed, result showed that the concentration of feed stream and benzene phase reflux have larger sensibility while heating load and reflux ratio have smaller sensibility. A pilot column with DN100 and with 2.8m height was designed and manufactured based on these simulation data, and then experiments were carry out in lined with the simulation conditions. Under optimal operate condition, product drawn from bottom can reach at 99%(wt) and above. In the experiments, partially condensation section of the column can automatically adjust reflux ratio, So it can remarkably improve the operation stability, the three phase azeotropic point can be stably sustained at 64.85℃ on the top. that is consistent with the theory analyze.更多还原