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Method for one-stage extraction, distillation and separation of C5 fractions by using reactive distillation N-methyl pyrrolidone (NMP) method

A technology of extractive distillation and reactive distillation, which is applied in the field of separation of C5 fractions, to achieve the effect of reducing solvent ratio, simplifying solvent regeneration unit, reducing solvent usage and regeneration amount

Active Publication Date: 2010-09-22
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] In order to solve the problems existing in the existing C-penta-distillation separation process, the present invention proposes a C-penta-distillate one-stage extractive distillation separation process using a mixed solvent containing NMP as an extraction agent, canceling the two-stage extractive distillation, and adopting reactive distillation technology

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  • Method for one-stage extraction, distillation and separation of C5 fractions by using reactive distillation N-methyl pyrrolidone (NMP) method
  • Method for one-stage extraction, distillation and separation of C5 fractions by using reactive distillation N-methyl pyrrolidone (NMP) method

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Embodiment 1

[0051] The cracked carbon five distillate of a certain factory is used as a raw material, and the method of the present invention is used to separate it. (1) Light removal: C5 raw material 6 (mainly composed of C4 8.4%, pentane 11.6%, pentene 19.2, alkyne 0.2%, isoprene 21.4%, cyclopentadiene 17.2%, piperylene olefin 13.9%, C6 8.1%) enter the light removal tower 1, through the reactive distillation process, light components 7 such as C4 and isopentane are extracted from the top of the tower, including isoprene, cyclopentadiene, bicyclic The light removal tower still material of pentadiene and piperylene is sent to the heavy removal tower 2; The recovery rate of alkanes at the top of the tower is 95%, and the recovery rate of alkynes at the top of the tower is 99.3%; the top of the tower is 38-45°C, 0.25-0.35MPa, and the bottom of the tower is 75-95°C, 0.3-0.4MPa;

[0052] (2) Weight removal: the materials in the weight removal tower are sent to the middle part of the weight r...

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Abstract

The invention discloses a method for the one-stage extraction, distillation and separation of carbon 5 (C5) fractions by using the reactive distillation NMP method. The method comprises the following steps of: light components removal, heavy components removal, extractive distillation, gas stripping and purification, wherein in the step of light components removal, most alkynes are removed from atower top through isopentane; in the step of extractive distillation, the mixed solvents of the NMP and salt solution serve as an extracting agent; and in the steps of light components removal and heavy components removal, the process of reactive distillation is used. The method has the advantages of improving the extracting agents and the selectivity of the extracting agents; saving a two-stage extractive distillation unit, and reducing the using amount and regeneration amount of the solvents, thereby reducing the operation fee.

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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C7/08C07C7/177C07C11/18C07C11/20C07C13/61
CPCY02P20/10
Inventor 刘智信李东风程建民廖丽华李晓峰过良王婧李琰
Owner CHINA PETROLEUM & CHEM CORP
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