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Method for separating low carbon olefin mixed gas by rectifying and absorbing

A low-carbon olefin and mixed gas technology, applied in the field of low-carbon olefin refining, can solve the problems of high cost of cold box, incomplete separation, etc., and achieve the effects of cost reduction, less loss of absorbent, and less loss of solvent

Active Publication Date: 2014-03-05
CHINA TIANCHEN ENG +1
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In order to solve the problems existing in the prior art, the present invention provides a method for separating low-carbon olefin mixed gas by means of rectification and absorption, which solves the problems in the prior art of using a cold box to increase the cost and incomplete separation

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  • Method for separating low carbon olefin mixed gas by rectifying and absorbing
  • Method for separating low carbon olefin mixed gas by rectifying and absorbing
  • Method for separating low carbon olefin mixed gas by rectifying and absorbing

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Embodiment Construction

[0032] Attached below figure 1 The process flow of the present invention is further described through specific examples.

[0033] The method of separating low-carbon olefin mixed gas by rectification and absorption includes the following steps: pass the compressed and dried low-carbon olefin mixed gas A and liquid into the high-pressure de-propanizer 1, and collect it from the bottom of the high-pressure de-propanizer 1. The C4+ rich in C3 enters the low-pressure de-propanizer 2, and the top liquid of the low-pressure de-propanizer 2 is pumped into the high-pressure de-propanizer 1. The gas collected from the upper part of the high-pressure depropanizer 1 is passed to the process gas compressor 12. The boosted gas is cooled and enters the demethanizer 3, and the gas from the top of the demethanizer 3 enters the bottom of the absorption tower 4, from the upper part of the absorption tower 4 The absorbent is introduced, and after mass transfer, the C1 and lighter components B that...

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Abstract

The invention relates to a method for separating low carbon olefin mixed gas by rectifying and absorbing. The method utilizes a hydrocarbon or oxygen-containing organic compound absorbent to separate methane from C2; a rectifying method is used for separating C2-C4 so that polymeric layer ethylene and propylene are obtained. By utilizing the method, the ethylene is separated from the methane by using the absorbent and without setting any deep freeze refrigeration plant (such as a refrigerator, an expander and the like); the lowest operation temperature of the process is more than minus 40 DEG C and the material cost of the device is reduced. By utilizing the absorbent, the ethylene is absorbed in an absorption tower so that the separation between the ethylene and the methane is realized; as boiling points of the absorbent and the ethylene are greatly different, the absorbent is easily separated from the ethylene, the solvent loss is less, and the absorbent does not pass through other towers and does not cause incomplete separation formed by generating azeotropy with C5 and the like.

Description

Technical field [0001] The invention belongs to the field of low-carbon olefin refining, and relates to a method for separating methanol to prepare olefins via a fluidized bed reactor. Background technique [0002] Ethylene and propylene are important platform compounds and basic chemical raw materials in petrochemical industry, and the world's annual demand is nearly 200 million tons. There will still be a big gap in domestic ethylene and propylene production in the next few years. The existing ethylene and propylene production technologies are heavily dependent on petroleum resources. Ethylene production generally adopts the light oil cracking method. About 97% of propylene production comes from the co-production of cracking ethylene and the by-products of oil refineries. The raw material cost for preparing ethylene and propylene by the light oil cracking method accounts for 60-80% of the production cost. Although the existing propylene production technology (combined produc...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C11/06C07C9/08C07C11/04C07C7/04C07C7/11C10G5/04C10L3/12
CPCY02P20/10Y02P20/50
Inventor 任昌瑜刘新伟袁学民孙世谦杨克俭林彬彬孙铭绪杨光陆峰
Owner CHINA TIANCHEN ENG
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