优秀毕业论文（设计）_年产20万吨乙二醇工艺设计及优化.docVIP

摘 要 乙二醇是一种重要的大宗化工原料目前乙二醇的生产方法可主要分为以乙烯为原料的“石油路线法”和以合成气为原料的“非石油路线法”。传统的石油路线法虽技术成熟，但因严重依赖高价的石油资源，且生产过程水耗大，能量损失大而面临激烈的竞争。煤合成气制乙二醇是一种通过CO和H2耦合加氢合成乙二醇的新型方法，目前受到全世界广泛的关注。煤制乙二醇符合我国“缺油、少气、相对富煤”的能源且具有消耗少，能耗小，水耗小，排放少的优势。本以一氧化碳偶联反应制备草酸二甲酯，草酸二甲酯加氢制乙二醇的工艺方法为依托，对年产20万吨乙二醇项目进行工艺设计及优化。 本设计以CO、H2、液氨、甲醇等为原料，使用Aspen plus对整个工艺进行模拟，得到乙二醇产量为20.5万吨/年，质量分数为99.8%，达到国家优等品标准。并联产2万吨/年，质量分数高达99.99%的副产物碳酸二甲酯及2.5万吨/年，质量分数达99.3%的副产物乙醇酸甲酯，提高了经济收益。同时在模拟过程中进行创新，如引入反应精馏技术，变压精馏技术等。之后又对工艺路线中的几个典型的塔器进行了优化，以DMO精馏塔T0202为例，优化之后塔板数为34块，第12块板为进料位置，回流比为0.18，最后对换热网络进行优化全流程公用工程耗量下降明显，能够节省热耗24.25%，节省冷耗36.42%。 Abstract Ethylene glycol is an important bulk chemical raw materials.At present, the technologies of producing EG can be mainly classified as Oil to EG and Coal to EG.The traditional oil approach is mature,but it faces cut-throat competition with serious reliance on the high-price oil resourses,large water consumption during the progress abundant energy consumption and high costs, “Coal-based ethylene glycol synthesis”-the technology of yield ethylene glycol by using CO and H2 of the syngas produced from coals chemical industry that have attracted wide attentions around the world,with the characters of low costs,low energy cnsumption,low water consumption and low emissions suitable for China’s resourse features of poor reserves of oil and gas but relatively rich storage of coal resources.The design focus on carbon monoxide coupling reaction to prepare dimethyl oxalate, the process of making ethylene glycol out of dimethyl oxalates hydrogenation is that, to produce 200,000 tons of ethylene glycol project processing design and optimization. The design’s raw material is CO, H2, ammonia, methanol, etc. Use aspen plus simulation of the entire process and get ethylene glycol yield 20.5million tons / year, mass fraction of 99.8%, up to the national standard for Excellence. And cogeneration 20,000 tons / year, 99.99% of the mass fraction of byproduct dimethyl carbonate, 25,000 tons / year, 99.34% of the mass fracti