年产20万吨甲醇制二甲醚工艺设计 毕业论文

《年产20万吨甲醇制二甲醚工艺设计 毕业论文》由会员上传分享，免费在线阅读，更多相关内容在学术论文-天天文库。

1、毕业设计题目：年产20万吨甲醇制二甲醚工艺设计学院：化学与材料工程学院专业：化学工程与工艺姓名：学号：完成时间：2014.3.25—2014.5.20设计说明作为液化石油气（LPG）和石油类的替代燃料，目前二甲醚（DME）倍受注目。DME是具有与LPG的物理性质相类似的化学品，在燃烧时不会产生破坏环境的气体，能便宜而大量地生产。与甲烷一样，被期望成为21世纪的能源之一。目前生产的二甲醚基本上由甲醇脱水制得，即先合成甲醇，然后经甲醇脱水制成二甲醚。甲醇脱水制二甲醚分为液相法和气相法两种工艺，本设计采用气相法制备二甲醚工艺。将甲醇加热蒸发，甲醇蒸气通过γ-AL2O3催化剂床层,气相甲醇脱水

2、制得二甲醚。气相法的工艺过程主要由甲醇加热、蒸发、甲醇脱水、二甲醚冷凝及精馏等组成。甲醇气相法合成二甲醚是目前国内外二甲醚生产的主要工艺，该法以精甲醇为原料，脱水反脱水和二甲醚精馏等工艺。目前国外公布的大型二甲醚建设项目绝大多数采用两步法工艺技术，说明甲醇气相法有较强的综合竞争力。关键词：二甲醚，甲醇，工艺设计II河南城建学院本科毕业设计DesignspecificationDesignspecificationAsLPGandoilalternativefuel,DMEhasdrawnattentionsatpresent.PhysicalpropertiesofDMEissimilarf

3、orLPG,anddon’tproducecombustiongastodamagetheenvironment,so,Itcanbeproducedlargely.Likemethane,DMEisexpectedtobecome21stcenturyenergyresources,DMEispreparedbymethanoldehydration,namely,syntheticmethanolfirstandthenmethanoldehydrationtodimethyletherbymethanoldehydration.MethanoldehydrationtoDMEisdiv

4、idedintotwokindsofliquidphaseandgas-phaseprocess.Thisdesignusesaprocessgasofdimethyletherpreparedbydimethyl.Heatingmethanoltoevaporation,methanolvaporthroughtheγ-Al2O3catalystbed,vapormethanoldehydrationtodimethyletherby[2]. Thisprocessismadeofmethanolprocessheating,evaporation,dehydrationofmethano

5、l,dimethylethercondensationanddistillationetc.Methanolgasphasemethodsynthesisofdimethyletherisathomeandabroadanddimethylether,themaintechnologyofproductionwithfinemethanolasrawmaterials,dehydrated,reactionby-productsless,dimethyletherpurityof99.9%,thecraftismature,thedevicewideadaptability,simplepo

6、st-treatment,canbedirectlybuiltinmethanolproductionfactory,alsocanbebuiltinotherpublicfacilitiesgoodthemethanolproductionfactory.Thelawshouldpassmethanolsynthesis,methanoldistillation,methanoldehydrationanddimethyletherdistillation,etc.Atpresentforeignlargedimethyletherreleasedmostoftheconstruction

7、projectbytwo-stepprocesstechnology,explainmethanolgasphasemethodhasthestrongcomprehensivecompetitivepower.Keywords:dimethylether,methanol,processdesignII河南城建学院本科毕业设计目录目录前言11绪论21.1二甲醚概述21.1.1二甲醚的发展现状21.1.2二甲