Method for separating carbon 5 fraction by one-stage extraction and rectification

A technology of extractive rectification and separation method, which is applied in the field of separation of C5 fractions, can solve the problems of complex process and difficult operation, and achieve the effects of simplifying process, reducing operating costs and reducing equipment investment.

Active Publication Date: 2009-06-10
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0009] In order to solve the problems of complicated process and difficult operation in the existing C5 distillation separation process, the present

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  • Method for separating carbon 5 fraction by one-stage extraction and rectification
  • Method for separating carbon 5 fraction by one-stage extraction and rectification

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Embodiment Construction

[0037] Refer below figure 1 The method of the present invention is further explained, but the present invention is not limited thereto.

[0038] A method for extracting and rectifying the separation of carbon five fractions of the present invention comprises the following steps:

[0039] (1) Light removal: C5 raw material (mainly composed of C4 8.4%, pentane 11.6%, pentene 19.2, alkyne 0.2%, isoprene 21.4%, cyclopentadiene 17.2%, piperylene 13.9%, carbon six 8.1%) enter the light removal tower 1, the theoretical plate number of the light removal tower is 120, the operation reflux ratio is 16, light components 9 such as carbon four, alkynes and isopentane are extracted from the top of the tower, The material in the light removal tower tank is sent to the dimerization reactor 2; the content of isoprene at the top of the light removal tower is controlled to be 1%, 40.6% of carbon four, 24.8% of isopentane, and 0.8% of alkyne, and the alkyne is at the top of the tower The recove...

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Abstract

The invention discloses a method for the one-section extraction separation and cracking of C5 distillate. The method comprises the following steps: cracking C5 raw materials to separate light components such as C4 and acetylene hydrocarbons in a lightness removing tower; making the raw materials in a lightness removing tower kettle to react in a dipolymer reactor so as to make cyclopentadiene be dimerized into dicyclopentadiene; removing heavy components of reaction products in a weight removing tower so as to obtain material stream containing isoprene at the tower top; carrying out extraction and rectification in an extraction and rectification tower, and collecting the reaction products at a tower kettle and sending the reaction products into a stripping tower; separating isoprene with solvent in the stripping tower, collecting the isoprene at the tower top and sending the isoprene into the dipolymer reactor, and making cyclopentadiene be dimerized into dicyclopentadiene; and finally introducing the reaction products into an isoprene treating tower for refinement so as to obtain a polymer grade isoprene product. The method has the advantages of short flow, low energy consumption, low construction and operating cost, high product quality, and the like.

Description

technical field [0001] The present invention relates to a kind of separation method of C5 fraction, more specifically, the present invention relates to a kind of one-stage extractive distillation separation method of C5 fraction. Background technique [0002] C5 fraction is an important co-product of ethylene production plant, among which isoprene, cyclopentadiene and piperylene are all important raw materials of organic chemical industry and fine chemical industry. With the development of petrochemical industry, the separation and utilization of C5 fractions are of great significance to the rational utilization 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 unit first, and the pretreatment unit includes three parts: pre-light removal, dimerization react...

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Application Information

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IPC IPC(8): C07C11/18C07C13/61C07C7/08C07C7/00
Inventor 李东风程建民杜春鹏刘智信过良廖丽华王婧
Owner CHINA PETROLEUM & CHEM CORP
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