摘 要：乙二醇主要应用于聚酯的生产领域，约占总消费量的93.0%，随着聚酯产业快速发展，中国市场对乙二醇供不应求。本设计采用新型碳酸乙烯酯醇解工艺生产乙二醇，工艺能充分利用生产环氧乙烷的副产物二氧化碳，既节省资源又缓解温室效应。利用流程模拟软件Aspen Plus 8.4对碳酸乙烯酯醇解工艺中的环氧化、环加成、酯交换、萃取分离四个工段进行全流程模拟，并对反应器进行动力学模拟与设计，获得了乙二醇塔、碳酸乙烯酯萃取精馏塔和N-N二甲基甲酰胺溶剂回收塔的工艺操作条件，这为30万吨/年碳酸乙烯酯醇解工艺生产乙二醇的中试研究提供基础参数。此外，结合模拟数据对换热器进行设计、选型和校核以及热集成优化整合。70435

毕业论文关键词：乙二醇，碳酸乙烯酯醇解，Aspen Plus模拟，换热器

Abstract：Ethylene glycol is mainly applied in the field of polyester, and the total consumption is up to 93.0%, so the supply of ethylene glycol in China is short of demand. This new technology of ethylene carbonate alcoholysis was applied to produce ethylene glycol in the design that can completely use the byproduct of carbon dioxide in the production of ethylene oxide, and it may save costs and reduce greenhouse gas emissions. The whole process, including epoxidation, cycloaddition, transesterification and extraction separation, were simulated using Aspen plus8.4 process simulation sofeware, and the dynamic simulation and design for the reactor was also modeled. Process operation condition of the towers for separating ethylene glycol, ethylene carbonate and N, N-dimethylformamide were obtained in the process, which provided technology parameters for 300,000 t/a EG with the method of ethylene carbonate alcoholysis. Additionally, the heat exchangers were designed, selected and checked in the production process, and heat intergration was optimizated based on the simulation results.

Key words: ethylene glycol, ethylene carbonate alcoholysis, Aspen Plus simulation, heat exchange 

目录

1  前言 3

2  乙二醇主要生产工艺 3

2.1  非催化水合法 3

2.2  催化水合法 4

2.3  碳酸乙烯酯法 4

2.4  合成气氧化偶联法 4

2.5  工艺方案选择 5

3  乙二醇生产工艺模拟 5

3.1  Aspen Plus物性方法与模型 5

3.2  催化剂选择 7

3.3  萃取剂选择 7

3.4  分工段模拟与分析 8

3.4.1  环氧化反应工段 8

3.4.2  环加成反应工段 10

3.4.3  酯交换反应工段 12

3.4.4  萃取分离工段 13

3.5  分离技术创新与节能降耗技术创新 18

3.5.1  分壁式精馏塔 18

3.5.2  引用多效精馏 18

3.6  Aspen工艺流程模拟与优化 19

3.6.1  乙二醇塔进料板位置优化 20

3.6.2  乙二醇塔回流比优化 20

4  热量集成设计