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Improved low-temperature rectisol and improved low-temperature rectisol device

A low-temperature methanol washing and improved technology, which is applied in the process of purifying water gas and water gas purification process, can solve the problems of high production operation cost, large amount of circulating methanol, and large investment in equipment, so as to reduce production operation cost and reduce Pipeline and equipment size, the effect of reducing equipment investment

Inactive Publication Date: 2012-06-27
李德全 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, low-temperature methanol washing also has its disadvantages. The large amount of circulating methanol leads to large investment in equipment and high production and operation costs.

Method used

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Embodiment Construction

[0020] The device structure of the present invention is as figure 1 Shown: a device for low-temperature methanol washing, including a sulfide absorption tower 1, the sulfide absorption tower 1 is connected to a process gas quencher 2, and the process gas quencher 2 is connected to a carbon dioxide quencher 3. A carbon dioxide separation tank 4 is arranged between the chiller 3 and the carbon dioxide absorption tower 5. The carbon dioxide separation tank 4 communicates with the carbon dioxide chiller 3 through pipelines, and the carbon dioxide absorption tower 5 communicates with the sulfide absorption tower 1 through pipelines.

[0021] The principle of the present invention is as follows: firstly, the sulfide is removed, and the process gas after the sulfide removal is cooled to liquefy part of the carbon dioxide, and then the liquid carbon dioxide is separated by a separation device. Part of the carbon dioxide remaining in the process gas is removed by using methanol. Due t...

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Abstract

Provided are an improved low-temperature rectisol method and an improved low-temperature rectisol device. Hydrogen sulfide and carbon dioxide in process gas are removed respectively in two absorbing towers, and the process gas is cooled between two towers so that part of carbon dioxide is liquefied and separated. The two towers absorb hydrogen sulfide and carbon dioxide respectively. Part of carbon dioxide is liquefied and separated by cooling the process gas after hydrogen sulfide is removed through the hydrogen sulfide absorbing tower so that content of carbon dioxide in the process gas is reduced, and content of carbon dioxide in the process gas entering the carbon dioxide absorbing tower is correspondingly reduced. The method can effectively reduce dimensions of a low-temperature rectisol pipeline and equipment, reduces methanol circulating quantity, equipment investment and production running costs are reduced, air-lift nitrogen dosage is reduced, and more pure-state carbon dioxide facilitating application and treatment is obtained.

Description

technical field [0001] The invention relates to the technical field of water gas purification, in particular to a water gas purification process flow, which is a novel water gas purification process flow. Background technique [0002] The low-temperature methanol washing purification technology is a process suitable for the treatment of sulfide-containing water gas purification developed by Linde Company and Lurgi Company in the early 1950s. Low-temperature methanol washing uses methanol as an absorbent for physical absorption. [0003] Due to the sharp rise in oil prices, the cost of petrochemicals has increased significantly, and low-cost coal has become a new raw material for the production of petrochemical products. Low-temperature methanol washing has good selectivity, and can selectively remove carbon dioxide and hydrogen sulfide. The high degree of gas purification can make the total sulfur content in the purified process gas less than 0.1ppm, which can well protect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10K1/16C10K1/04C01B31/20C01B32/50
CPCY02A50/20
Inventor 李德全崔静思
Owner 李德全
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