【作者】 李文忠；

【导师】 干爱华；

【作者基本信息】 天津大学 ， 化学工程， 2007， 硕士

【摘要】 二甲基苄醇(CA)和环氧丙烷(PO)广泛应用于化工、轻工、医药、食品和纺织等领域。然而目前国内外CA和PO均供不应求,缺口较大,为了满足CA和PO的需求,需要对二者进行扩产,但二者的传统生产方法污染严重、成本较高。本文研究了CHP法生产CA和PO的生产新工艺,用CHP在Ti/SiO2催化剂中氧化丙烯制得PO,同时得到CA,该方法不仅能避免氯醇法生产PO产生的大量含氯废水,还能消除CA生产过程中的含硫废水及廉价盐,减少环境污染,大大提高两个过程的综合经济效益,在当今环保问题日益得到重视情况下该生产方法的意义很大。本文在参考国外CHP法生产PO分离部分相关数据的基础上,利用流程模拟软件PRO/II对CHP法生产CA与PO的分离部分进行了模拟计算。首先根据国外类似分离装置的相关数据倒推其分离装置的操作参数和设计参数,分别使用适合该物系的几个热力学模型进行计算,然后与相近装置的操作数据进行比较,将计算结果最接近操作数据的热力学模型定为该物系的气液平衡计算模型,再将此模型应用于生产CA与PO的分离计算中。模拟过程中,对生产工艺的分离部分提出两个分离方案,闪蒸进料方案和单股进料方案。将两个分离方案进行比较,发现单股进料方案虽然省掉一个丙烯塔C-302,节省了能耗及冷凝装置,但需要引入压缩装置,因压缩机为成本较高的动力装置,总体上不如闪蒸进料方案经济。对闪蒸进料方案的各塔进行优化,改变塔顶采出量、理论板数、塔顶压力及进料位置,得到它们与回流比的关系图,经过分析讨论得到最佳操作条件。模拟中发现气相处理部分可以将丙烯塔C-302与轻馏分塔C-303合并为一个塔,侧线采出丙烯、丙烷,既节省了冷凝器,又降低了能耗。本文的研究成果,不仅可为国内CA和PO的工业化生产方法提供新思路,而且对提高分离装置操作水平,流程优化,降低装置能耗有重要作用,同时为使用流程模拟软件PRO/II进行模拟计算提供了很好的实例,并可以为CHP法生产CA与PO及用CHP仅生产PO的分离部分提供完整的工艺包。更多还原

【Abstract】 Dimethyl phenyl carbinol (CA) and propylene oxide(PO) are widely applied infields of chemistry、light industry、medication、food and spin. However, the supplyof CA and PO is short of demand and a large gap appears.Both traditional synthesismethods pollute environment heavily and the cost is relatively high. In order to meetthe need, in the paper, a new technology to produce CA and PO with CHP methodwas studied. In the process, propylene was oxidated to make PO with the catalyzer ofTi/SiO2 by CHP, also CA was obtained. With the method, large amount of chlorinouswaste water from PO production by Chlorine Alcohol method is avoided, also wastewater containing sulfur and inexpensive salt from the synthesis of CA are eliminated.It reduces environment pollutants and enhances the comprehensive economicefficiency of the two processes greatly. It is of great importance today when theenvironment problems being attached more attentions.The separation of CA and PO mixture was simulated by the flow simulationsoftware of PRO/II according to the data gotten from PO made in foreigncountries.Firstly, basing on“backing out”method according to correlational data ofsimilar separation apparatus , apparatus parameters were gotten. Then, the optimalthermodynamics method was chosen by using several thermodynamics model for thesame separation column and comparing the results with the pratical data.Two separation ways of flash feed and single feed were proposed. Though withthe single feed method, column C-302 and heat exchanger can be reduced and energycould be saved, compressor is needed which costs too much. Thus, the flash feed wayis much better. Each column of flash feed way was optimized by changing top reflux、the number of theoretical stages、top pressure and feed location, then the relationshipof reflux ratio and each of them was gotten, with which the optimum number oftheoretical stages、feed location and top pressure were gained. The flash feed flowsheet was optimized and it was found that propylene column C-302 and light endscolumn C-303 in the vapor disposal section could be combined, in which side flow ofpropylene and propane was draw out. It can spare the condenser and save energy.As a result, new thought is provided for production of CA and PO in our country, important function is made to improve separation level, optimize the flowsheet andreduce energy cost. It is also a good example for simulating with the software ofPRO/II, and an integrated process package is provided.更多还原