毕业设计----年产40万吨二甲醚工艺设计

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1、- I - 年产 40 万吨二甲醚工艺设计 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 -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）

2、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。 - II - The design of dimehyl ether process annual output 400,000 tons Abstract: As LPG and oil alternative fuel, DME has drawn attentions at present. Physical properties of DME is similar for LPG, and dont produce combustion gas to d

3、amage the environment, so, It can be produced largely. Like methane, DME is expected to become 21st century energy sources., DME is prepared by methanol dehydration, namely, synthetic methanol first and then methanol dehydration to dimethyl etherby methanol dehydration. Methanol dehydration to DME i

4、s divided into two kinds of liquid phase and gas-phase process. This design uses a process gas of dimethyl ether prepared by dimethyl. Heating methanol to evaporation, methanol vapor through the -AL 2O3 catalyst bed, vapor methanol dehydration to dimethyl etherby. This process is made of methanol process heating, evaporation, dehydration of methanol, dimethyl ether condensation and distillation etc. Completed for the following work: 1) Distillation tower used in separation of dimethyl e