陕西理工学院毕业设计-PAGEII-年产40万吨二甲醚工艺设计（陕西理工学院化学学院化工专业06级1班，陕西汉中723000）指导教师：[摘要]作为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。主要完成以下工作：1）精馏用到的二甲醚分离塔和甲醇回收塔的塔高、塔径、塔板布置等的设计；2）所需换热器、泵的计算及选型；[关键词]二甲醚，甲醇，工艺设计。Thedesignofdimehyletherprocessannualoutput400,000tonsMaPeng-jun(Grade06,Class1,MajorChemicalEngineeringandTechnology,SchoolofChemicalandenvironmentalsciences,ShaanxiUniversityofTechnology,Hanzhong723000,Shaanxi)Tutor:LIZhi-zhouAbstract:AsLPGandoilalternativefuel,DMEhasdrawnattentionsatpresent.PhysicalpropertiesofDMEissimilarforLPG,anddon’tproducecombustiongastodamagetheenvironment,so,Itcanbeproducedlargely.Likemethane,DMEisexpectedtobecome21stcenturyenergysources.,DMEispreparedbymethanoldehydration,namely,syntheticmethanolfirstandthenmethanoldehydrationtodimethyletherbymethanoldehydration.MethanoldehydrationtoDMEisdividedintotwokindsofliquidphaseandgas-phaseprocess.Thisdesignusesaprocessgasofdimethyletherpreparedbydimethyl.Heatingmethanoltoevaporation,methanolvaporthroughtheγ-AL2O3catalystbed,vapormethanoldehydrationtodimethyletherby.Thisprocessismadeofmethanolprocessheating,evaporation,dehydrationofmethanol,dimethylethercondensationanddistillationetc.Completedforthefollowingwork:1)Distillationtowerusedinseparationofdimethyletherandmethanolrecovery,columnheightoftower,diameter,arrangementofcolumnplateetc;2)Thecalculationandselectionofheatexchanger,pump;Keywords:dimethylether,methanol,processdesign.目录TOC\o"1-3"\h\z\uHYPERLINK\l"_Toc29316017"1概述PAGEREF_Toc29316017\h1HYPERLINK\l"_Toc29316018"1.1二甲醚的用途PAGEREF_Toc29316018\h1HYPERLINK\l"_Toc29316019"1.2设计依据PAGEREF_Toc29316019\h1HYPERLINK\l"_Toc29316020"1.3技术来源PAGEREF_Toc29316020\h1HYPERLINK\l"_Toc29316021"1.3.1液相甲醇脱水法制二甲醚PAGEREF_Toc29316021\h1HYPER