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

A technology of extractive distillation and extractive distillation column, which is applied in the field of separation of C5 fractions, can solve problems such as complex process and difficult operation, and achieve the effects of simplifying the process, reducing the amount of solvent used, and reducing the solvent ratio

Active Publication Date: 2009-05-06
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0010] In order to solve the problems of complex process and difficult operation in the existing C5-distillation separation process, the present invention proposes a one-stage extraction of C5-distillate using a mixed solvent containing NMP as the extraction agent in order to improve the extractant and increase the selectivity of the extractant Distillation separation process

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

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Embodiment Construction

[0038] Refer below figure 1 The method of the present invention is further explained, but the present invention is not limited thereto.

[0039] A method for extracting and rectifying the separation of carbon five fractions of the present invention comprises the following steps:

[0040] (1) Light removal: mixed C5 cut raw material 7 (mainly composed of C4 8.4%, pentane 11.6%, pentene 19.2, alkyne 0.2%, isoprene 21.4%, cyclopentadiene 17.2%, meta Pentadiene 13.9%, C6 8.1%) enter light removal tower 1, light components 8 such as most alkynes, C4 and isopentane are extracted from the top of the tower, and the recovery rate of alkynes at the top of the tower is 99.7% %, the material in the light removal tower is sent to the dimerization reactor 2. The theoretical plate number of the light removal tower is 120, the operating reflux ratio is 16, the content of isoprene at the top of the light removal tower is controlled to be 1%, and the recovery rate of isopentane at the top of ...

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Abstract

The invention discloses a method for separating C5 fraction through first-stage extraction rectification by a NMP method. The method comprises the steps of dehydrogenation, dimerization reaction, deheavy, extraction rectification, steam stripping and refining, wherein isopentane is utilized to take most of acetylene hydrocarbon away from the tower top in the dehydrogenation step; and a mixed solvent of NMP and a saline solution is adopted as an extracting agent in the step of extraction rectification. The method improves the extracting agent, increases the selectivity of the extracting agent, cancels a two-stage extraction rectification unit, and reduces the using amount and the regeneration amount of the solvent, thereby reducing operating cost.

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 rectification with the mixed solvent of NMP (N-methylpyrrolidone, N-methylpyrrolidone) and salt solution as extraction agent Method for separation of C5 fractions. 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. The components in the pyrolysis C5 fraction not only have similar boiling points, but also form two-component and three-component azeotropes with each other. It is difficult to obta...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C2/50C07C7/00C07C11/173C07C13/61
Inventor 李东风程建民刘智信廖丽华过良
Owner CHINA PETROLEUM & CHEM CORP
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