改张伟日-毕业设计1

学 号：201143200402

毕业

论文

设计题目：年产6万吨聚甲醛工厂的初步设计 学生姓名：张伟日 专业班级：11化专4班

学院系部：迁安学院化工与环境系 指导教师：白娣斯

2014年05月20日

摘 要

摘 要： 聚甲醛是第三大工程塑料，具有优越的金属性能，广泛应于各行各业。通过对比均聚甲醛和共聚甲醛的工艺及产品特性，选择共聚工艺进行了流程介绍，流程包括甲醛工序、三聚甲醛工序、二氧戊环工序和聚合工序，其中甲醛制备采用铁钼催化剂，聚合反三聚甲醛和二氧戊环为反应单体，三氟化硼为催化剂，在150 ℃、0.01 MPa条件下得到聚甲醛产品。聚合反应器为双轴螺杆卧式容器材质选用304不锈钢。.本文章主要简单明要的介绍了聚甲醛的特性、生产工艺及广泛用途；分析了我国聚甲醛的生产现状、生产企业及发展前景；并对未来聚甲醛的发展提出建议。在世界上聚甲醛是非常重要的材料，具有优越的金属性能，广泛应用于各行各业。

关键词： 三聚甲醛； 二氧戊环； 共聚甲醛； 工艺流程； 反应器

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Abstract

Abstract:Polyoxymethylene(POM) is the third largest engineering plastic, which is widely applied in many fields because of its superior performances. In this paper, productiontechnology of copolyoxymethylene(co-POM) was introduced by comparing production technology and characteristicsof acetal homopolymer and co-POM. The process includes formaldehyde unit, trioxymethylene(TOX)unit,dioxolame(DOX) unit and polymerization unit.Molybdenum catalyst is used in the formaldehyde unit. During polymerization,TOX and DOX are used as reactive monomers , boron trifluoride is used as catalyst，co-POM is synthesized under the conditions of 150 ℃and 0.01 MPa. The polymer reactor is a horizontal vessel with multi-axial screwmachine, which is made by 304 stainless steel.This paper introduced the characterristics,production process and wide application of POM briefly ;also the production enterprises and development prospects in our country were analyzed .Finally ,some suggestions for the develpoment of the POM industry were put forward.Polyoxymethylene(POM) is the most important engineering plastic, which is widely applied in many fields because of its superior performances.

Key words:Trioxane; Dioxolane; Co-POM; Technological process;

Reactor

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目 录

摘 要 .............................................................................................................................I Abstract .......................................................................................................................................... II 第1章 绪论 .................................................................................................................. 1 1.1 聚甲醛的现状 .................................................................................................... 1 1.1.1 聚甲醛在国外的发展状况 ......................................................................... 1 1.1.2 聚甲醛在国内的发展状况 ........................................................................... 2 1.1.3 聚甲醛的性质及用途 ................................................................................... 4 1.2 聚甲醛的市场需求 ............................................................................................. 7 1.3.三聚甲醛法制取聚甲醛综述 ............................................................................ 10

1.3.1 1.3.2

均聚甲醛 ....................................................................................................... 10 共聚甲醛 ....................................................................................................... 11

1.4本章小结 ............................................................................................................ 12 1.5本章小结 ............................................................................................................ 13 第2章聚甲醛的工艺生产流程 .................................................................................. 13 2.1生产方法的确定 ................................................................................................ 13 2.1.1国内生产情况 .............................................................................................. 13 2.1.2 方法的确定 ................................................................................................. 14 2.2 工艺流程的叙述 ............................................................................................... 14 2.2.1 甲醛工艺 ..................................................................................................... 15 2.2.2TOX工艺 ..................................................................................................... 16 2.2.3 POX工艺 ..................................................................................................... 16 2.3 其余工艺 ........................................................................... 错误！未定义书签。 2.3.1 聚合工艺 ..................................................................................................... 17 2.3.2 研磨钝化单元 ............................................................................................. 17 2.3.3 脱除单体单元 ............................................................................................. 17 2.3.4掺混单元 ...................................................................... 错误！未定义书签。 2.3.5POM工艺 ..................................................................................................... 17

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