Abstract:

As LPG and oil alternative fuel, DME has drawn attentions at present. Physical properties of DME is similar for LPG, and don’t produce combustion gas to damage the environment, so, It can be produced largely. Like methane, DME is expected to become 21st century energy resources., DME is prepared by methanol dehydration, namely, synthetic methanol first and then methanol dehydration to dimethyl etherby methanol dehydration. Methanol dehydration to DME is 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 γ-AL

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O3 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 ether and methanol recovery , column height of tower ,diameter, arrangement of column plate etc;

2) The calculation and selection of heat exchanger, pump;

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Key words: dimethyl ether, methanol, process design

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目 录

摘要 前言

化工设计课程设计任务书 ............................................................... I 前 言 ............................................................................. 1 1 文献综述 ........................................................................... 1

1.1 二甲醚概述 ................................................................... 1

1.1.1 二甲醚的发展现状 ....................................................... 1 1.1.2 二甲醚的传统领域的应用及其拓展 ......................................... 1 1.2国内二甲醚市场简况 ............................................................ 2

1.2.1现状 .................................................................... 2 1.2.2 国内市场预测 ........................................................... 5 1.3国外二甲醚市场简况 ............................................................ 6

1.3.1现状 .................................................................... 6 1.3.2 国外市场预测 ........................................................... 8 1.4 原料说明 ..................................................................... 8 1.6 二甲醚的主要技术指标 ........................................................ 10

1.6.1技术要求 ............................................................... 11 1.6.2试验方法 ............................................................... 11

2 DME产品方案及生产规模 ............................................................. 14

2.1 产品品种、规格、质量指标及拟建规模 .......................................... 14 2.2 产品规格、质量指标 .......................................................... 14 2.3 产品方案分析及生产规模分析 .................................................. 15 3 工艺流程介绍 ...................................................................... 15

3.1生产方法简述 ................................................................. 15 3.2工艺流程说明 ................................................................. 18 3.3生产工艺特点 ................................................................. 20 3.4主要工艺指标 ................................................................. 20

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3.4.1 二甲醚产品指标 ........................................................ 20 3.4.2 催化剂的使用 .......................................................... 20

4主要塔设备计算及选型 ............................................................... 21

4.1 汽化塔及其附属设备的计算选型 ................................................ 21

4.1.1 物料衡算 .............................................................. 21 4.1.2 热量衡算 .............................................................. 23 4.1.3 理论板数、塔径、填料选择及填料层高度的计算 ............................ 26 4.1.4 汽化塔附属设备的选型计算 .............................................. 30 4.2 合成塔及其附属设备的计算选型 ................................................ 31

4.2.1 物料衡算 .............................................................. 31 4.2.2 合成塔的选取选取： .................................................... 31 4.2.3 热量衡算及附属设备的选型计算 .......................................... 32 4.3 精馏塔及其附属设备的计算选型 ................................................ 35

4.3.1 物料衡算 .............................................................. 35 4.3.2 热量衡算 .............................................................. 36 4.3.3 理论塔板数的计算 ...................................................... 38 4.3.4 初馏塔主要尺寸的设计计算 .............................................. 39 4.3.5塔径设计计算 ........................................................... 40 4.3.6 填料层高度的计算 ...................................................... 42 4.3.7 附属设备的选型计算 .................................................... 42 4.4 回收塔及其附属设备的计算选型 ................................................ 43

4.5.1 物料衡算 .............................................................. 43 4.4.2 热量衡算 .............................................................. 45 4.4.3 理论塔板数的计算 ...................................................... 47 4.4.4 回收塔主要尺寸的设计计算 .............................................. 47 4.4.5塔径设计计算 ........................................................... 49 4.4.6 填料层高度的计算 ...................................................... 50 4.4.7 附属设备的选型计算 .................................................... 50

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致谢 ................................................................................ 53 参考文献 ............................................................................ 54 附录1.主要设备一览表 ................................................................ 55

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