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Method for separating C5 fraction

A C5 fraction and extractive distillation technology is applied in the fields of azeotropic distillation, reactive distillation, separation of C5 fractions, and extractive rectification to separate and cracked C5 fractions, which can solve the problems of complex process and difficult operation, and achieve The effect of simplified process, high yield and purity, and reduced number of equipment

Active Publication Date: 2013-05-08
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0010] In order to solve the problems of complicated process and difficult operation in the existing technology of carbon five-distillation separation process, the present invention provides a method for separating carbon five-distillate fraction, which can improve the yield and purity of piperylene products, and reduce the Pentadiene plate number and reflux ratio, reducing equipment investment and operating costs

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  • Method for separating C5 fraction
  • Method for separating C5 fraction

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Embodiment

[0050] Such as figure 1 Shown, the method for separating carbon five cuts, comprises the following steps:

[0051] (1) Weight removal: carbon five raw materials (mainly composed of carbon four 8.4%, pentane 11.6%, pentene 19.2, alkyne 0.2%, isoprene 21.4%, cyclopentadiene 17.2%, piperylene 13.9%, carbon six 8.1%) is sent to weight removal tower 1, the number of theoretical plates of weight removal tower is 62, operating pressure 0.3MPa, tower top temperature 68 ℃, tower still temperature 102 ℃, liquid residence time 2.3 hours; Here, Dicyclopentadiene undergoes a dimerization reaction to generate dicyclopentadiene, with a conversion rate of 85%; heavy components such as piperylene and dicyclopentadiene are separated from isoprene, and are extracted from the tower tank and sent to piperylene and In the dicyclopentadiene refining unit, the recovery rate of piperylene and dicyclopentadiene in the bottom of the tower is over 99.5%, and light components such as isoprene are extract...

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Abstract

The invention discloses a method for separating C5 fraction. The method comprises the steps of pretreatment, extractive distillation, isoprene refining, piperylene refining, and dicyclopentadiene refining. During the isoprene refining process, isoprene is separated through azeotropic rectification, and azeotropic material flow is a product from an extractive distillation tower top. The flow rate ratio of the azeotropic material flow to the C5 removing tower top recovered material is 0.01-1. The two are mixed and are delivered into an isoprene tower. A plate number of the isoprene tower is 70-90. A reflux ratio is 15-25. With the method provided by the invention, isoprene product yield and purity can be improved, isoprene tower plate number and reflux ratio can be reduced, and equipment investment and operation cost can be reduced.

Description

technical field [0001] The present invention relates to the field of organic chemical industry, and furthermore, relates to a method for separating C5 fractions, more specifically, a method for separating and cracking C5 fractions by using azeotropic rectification, reactive rectification, and extractive distillation. Background technique [0002] The cracked C5 fraction is an important co-product of ethylene production units, among which isoprene (IP), cyclopentadiene (CPD) and piperylene (PD) are important raw materials for organic and fine chemicals. With the development of petrochemical industry, the separation and utilization of cracked carbon five fractions are of great significance to the rational use of resources and the improvement of the economics of ethylene plants. [0003] The existing C5 fraction separation process is mainly composed of two stages of extraction, each stage including extractive distillation and stripping. The C5 fraction enters the pretreatment ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C11/18C07C11/20C07C13/61C07C7/06C07C7/08C07C2/50
Inventor 刘智信李琰廖丽华杜春鹏李东风程建民罗淑娟过良王婧王宇飞
Owner CHINA PETROLEUM & CHEM CORP
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