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Method for removing acid gas by adopting methanol as absorbent

A technology of acidic gas and absorbent, applied in separation methods, chemical instruments and methods, separation of dispersed particles, etc., can solve the problems of impurities and water in raw material gas

Inactive Publication Date: 2015-03-25
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The purpose of the present invention is to solve the problem of impurities and moisture carried by the feed gas before entering the absorption tower, that is, pre-wash the feed gas, dehydrate and dry the feed gas and remove impurities such as ammonia, naphthalene, etc., so that the feed gas is processed in the subsequent The medium system will be more stable, and impurities will not affect the purification degree of the purified gas
[0011] The method of the invention solves the shortcomings of impurities and water in the raw material gas, and creates conditions for the stable operation of the low-temperature methanol washing purification method

Method used

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  • Method for removing acid gas by adopting methanol as absorbent
  • Method for removing acid gas by adopting methanol as absorbent

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Embodiment

[0024] Example: attached figure 2 It is the technical process of the embodiment.

[0025] The temperature from the conversion process is 40°C, the pressure is 5.4MPaA, and contains H 2 53.76%, CO 2 44.77%, H 2 S +COS 0.22%, N 2 0.3%, CO 0.77%, H 2 O 0.18% feed gas first enters the bottom of the pre-washing tower 4, and contacts with 30~40°C methanol sprayed on the top of the tower in countercurrent to remove impurities and moisture in the feed gas. The gas at the top of the pre-washing tower enters the absorption tower 3 after being cooled to -13°C by the process gas cooler 1. Thereafter, it is processed by low-temperature methanol washing method. The solution at the bottom of the pre-washing tower 4 enters the methanol-water separation tower as feed. After being treated by this method, impurities such as ammonia, naphthalene, and benzene contained in the raw gas will not accumulate in the system, eliminating the impact of impurities on the low-temperature methanol ...

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Abstract

The present invention belongs to the field of gas processing, and provides a method for removing acid gas by adopting methanol as an absorbent. According to the present invention, the method is mainly characterized in that a pre-washing tower is designed in front of an absorption tower, and pre-washing is performed on raw material gas with a barren solution obtained from the original low temperature methanol washing device and with a temperature of about 30-40 DEG C, such that the raw material gas is dewatered and completely dried, and ammonia naphthalene, benzene and other components carried in the raw material gas are removed; the liquid on the bottom portion of the pre-washing tower enters a methanol water separation tower; and the gas on the top of the pre-washing tower enters a process gas cooler and then enters the absorption tower. With the method of the present invention, the problem of the impurity and the moisture carried by carried raw material gas before entering the absorption tower is solved, wherein the raw material gas is pre-washed, such that the raw material gas is dewatered and dried, and the impurity such as ammonia, naphthalene, benzene and the like are removed so as to make the subsequent treatment system stable.

Description

technical field [0001] The invention belongs to the field of gas processing, and relates to a method for removing acid gas by using methanol as an absorbent, in particular to a method for pre-washing raw material gas by using methanol as an absorbent. Background technique [0002] The low-temperature methanol washing process is a physical absorption gas purification process jointly developed by the German Linde Company and Lurgi Company in the 1950s. This process uses low-temperature methanol as the absorption solvent, and utilizes the high solubility of methanol to acid gases at low temperatures. The characteristic of removing the acid gas in the raw material gas. Low-temperature methanol washing purification process can remove H in raw gas 2 S, COS, RSH, CO 2 and other components, and can be dehydrated to make the gas completely dry; at the same time, methanol has good chemical stability and thermal stability, methanol viscosity is small, methanol does not foam during op...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/14
Inventor 赵运生毛松柏叶宁郭本帅陈小花
Owner CHINA PETROLEUM & CHEM CORP
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