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Separation device and separation method for methanol-to-olefin gas

A methanol-to-olefins and separation device technology, applied in the field of petrochemical industry, can solve the problems of reducing energy consumption, equipment investment, long absorbent cycle, etc., and achieve the effect of reducing load

Pending Publication Date: 2020-04-03
PETROCHINA CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In view of this, the present invention provides a methanol-to-olefin gas separation device and method to solve the problem of long absorbent circulation loops in the prior art and reduce the load and energy consumption of the deethanizer and propylene rectification tower and equipment investment

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  • Separation device and separation method for methanol-to-olefin gas
  • Separation device and separation method for methanol-to-olefin gas
  • Separation device and separation method for methanol-to-olefin gas

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Embodiment Construction

[0082] Unless otherwise defined, all technical terms used in the embodiments of the present invention have the same meanings as commonly understood by those skilled in the art. In order to make the object, technical solution and advantages of the present invention clearer, the implementation manner of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0083] In the first aspect, the embodiment of the present invention provides a separation device for methanol to olefin gas, such as figure 1 As shown, the device includes: a pretreatment assembly 1, a separator 2, a condensate dryer 3, a first gas phase dryer 4, a deethanizer 5, a demethanizer 6, a solvent recovery tower 7, an acetylene converter 8, Ethylene rectification column 9 , depropanizer 10 , propylene rectification column 11 and debutanizer 12 .

[0084] Wherein, the pretreatment assembly 1 communicates with the inlet of the separator 2, the gas phase outlet...

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Abstract

The invention discloses a separation device and a separation method for methanol-to-olefin gas. According to the method, methanol-to-olefin gas is pretreated through a pretreatment assembly (1); phaseseparation is carried out in a separator (2); the condensate is conveyed to a condensate dryer (3); the gas phase is conveyed to a first gas phase dryer (4), and is dried, and the dried material is conveyed to an ethane removal tower (5); the tower top gas phase of the ethane removal tower (5) passes through a methanol removal tower (6), a solvent recovery tower (7), an acetylene converter (8) and an ethylene rectifying tower (9) to separate ethylene; and the tower bottom of the ethane removal tower (5) passes through a propane removal tower (10) and a propylene rectifying tower (11) to separate propylene. According to the method, the circulation loop of the absorbent comprises a methanol removal tower (6), a solvent recovery tower (7) and a methanol removal tower (6), so that the circulation loop is short, does not uses an ethane removal tower (5) and a propylene rectifying tower (11), and effectively reduces the load, the energy consumption and the equipment investment of the ethaneremoval tower (5) and the propylene rectifying tower (11).

Description

technical field [0001] The invention relates to the field of petrochemical technology, in particular to a separation device and method for producing olefin gas from methanol. Background technique [0002] In recent years, although the production of olefins at home and abroad has shown a trend of diversification, the non-steam cracking hydrocarbon production method represented by methanol to olefins (MTO) is still an important way to produce olefins. Methanol to olefins refers to the chemical process technology of producing low-carbon olefins by using coal-based or natural gas-based synthetic methanol as raw material, with the help of a fluidized bed reaction form similar to a catalytic cracking unit, and its main products are ethylene and propylene. [0003] At present, the most widely used separation process of MTO gas is the depropanization process before Lummus. In this process, the reaction gas enters the depropanizer from the MTO reactor, and the bottom stream of the d...

Claims

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Application Information

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IPC IPC(8): C07C11/04C07C11/06C07C7/11C07C7/04
CPCC07C7/11C07C7/04C07C7/005C07C11/04C07C11/06Y02P30/40
Inventor 陈昇曹新波王勇张来勇王维李静海赵梦纪明磊李玉鑫李春燕
Owner PETROCHINA CO LTD
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