二甲苯的生产工艺介绍.omc

目录

摘要 (2)

第一章目前国内外二甲苯的供需使用状况 (4)

1.1国际生产能力 (4)

1.2国际需求情况 (5)

1.4国内需求情况 (9)

第二章混合二甲苯的组分分析 (10)

第三章二甲苯的有效来源 (11)

3.1催化重整是混合二甲苯的主要来源 (11)

3.2高温裂解制乙烯副产BTX芳烃 (11)

3.3甲苯甲醇烷基化制高产率PX (12)

3.4异构化生产二甲苯技术简介 (12)

3.5.选择性甲苯歧化工艺 (13)

（1）埃克森美孚的PxMax工艺 (13)

(2)UOP的PXPlus工艺 (14)

(3)埃克森美孚的MSTDP工艺 (15)

(4)从选择性甲苯歧化工艺产品回收对二甲苯 (15)

3.6甲苯甲基化工艺 (17)

第四章混合二甲苯的分离方法 (19)

4.1精密精馏法 (19)

4.2常压低温结晶法 (19)

4.3深冷结晶法及加压结晶法 (19)

4.4全蒸发法 (20)

4.5吸附分离法 (20)

第五章汽油中各组分对排放的影响 (21)

5.1芳烃对排放的影响 (21)

5.2烯烃对排放的影响 (21)

5.3硫含量对排放的影响 (22)

5.4苯含量对排放的影响 (22)

第六章降低汽油芳烃含量的方法和机理 (23)

6.1液-液抽提 (23)

6.2抽提蒸馏 (24)

第七章生产混合二甲苯的必要性和可行性 (26)

第八章总结 (27)

第九章致谢 (28)

参考文献 (29)

外文翻译 (31)

摘要

混合二甲苯是重要的基础化工原料之一,其组成主要为对二甲苯、邻二甲苯、间二甲苯和乙基苯四种芳烃组分。通常意义上的混合二甲苯根据产品中芳烃组分含量的不同分为溶剂级和异构级。异构级混合二甲苯主要用于生产邻二甲苯和对二甲苯，溶剂级二甲苯可以生产溶剂、航空汽油的添加剂、农药、油漆及印刷油墨等。邻二甲苯(OX)是一种重要的有机化工原料，主要用于生产苯酐（邻苯二甲酸酐，PA），染料，杀虫剂等。随着国民经济的发展和环保意识的加强，国家对石化产品的质量要求越来越高。国Ⅲ排放标准中要求汽油中芳烃的含量≯40%。生产利用二甲苯的相关工艺已很成熟。从汽油中抽提芳烃生产二甲苯，既可以降低汽油中芳烃含量，使得汽油芳烃含量达到国家标准，减少对空气排放的影响，又可以将芳烃转化为二甲苯，从而投入到下游工业的生产中，转化为使用价值更高的化工产品，也为企业创造更高的经济效益，是一举两得的好事。

关键词：供需状况，有效来源，分离，排放，抽提

Abstract

the mixed xylene is one of the important basic chemical raw material, its composition is mainly for p-xylene, o-xylene, m-xylene, and ethyl benzene four kinds of aromatic components. Usually in the sense of mixed xylene according to the product of aromatic components in different levels can be divided into solvent and heterogeneous. Heterogeneous level of p-xylene and mixed xylene mainly for the production of o-xylene, solvents, solvent grade xylene can produce aviation gasoline additives, pesticides, paint, printing ink, etc. O-xylene (OS x) is a kind of important organic chemical raw materials, mainly for the production of phthalic anhydride, phthalic anhydride, PA), dye, pesticide, etc. With the development of national economy and the strengthening of environmental awareness, countries are increasingly demanding in the quality of petrochemical products. The Ⅲemissions standards asked ≯40% content of aromatics in gasoline. Production using xylene related technology has very mature. Xylene extraction from gasoline aromatics production, can reduce the aromatics content in gasoline, gasoline aromatics content meet the national standards, to reduce the influence of the air emissions, and aromatic hydrocarbons, which can be converted to dimethyl benzene, thus into the downstream industrial production, higher chemical products into use value, and create more economic benefits for the enterprise, is a good kill two birds with one stone.

Key words: supply and demand, effective source separation, emissions and extraction