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Purification process of raw material gas for production of synthetic ammonia or methanol production

A technology of raw material gas and purification process, applied in the direction of products, chemical instruments and methods, and separation of dispersed particles, which can solve the problems of insufficient adaptability and high cost of gas purification

Inactive Publication Date: 2007-05-16
SHANXI YANGMEI FENGXI FERTILIZER IND GRPCO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problems of high gas purification cost and insufficient adaptability in the prior art, the present invention provides a raw material gas purification process applied to the production of synthetic ammonia or methanol

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Embodiment 1: a kind of purification process applied to the raw material gas of synthetic ammonia or methanol production, comprises the following steps

[0018] 1. Desulfurization, the shift gas from the shift system (mainly CO, CO 2 、H 2 、H 2 S, CH 4 ) at a pressure of 3.4MPa, first sent to the lower part of the desulfurization tower, and countercurrently contacted with the hindered amine desulfurization liquid entering the tower from the upper part of the tower, the H in the gas 2 S and some CO 2 absorbed by the solution. Purified gas H from desulfurization tower 2 S content is less than 10mg / Nm 3 , to the decarburization process. After decompression, the hindered amine liquid coming out from the bottom of the desulfurization absorption tower passes through the solution heat exchanger and enters the solution flash tank. Under the pressure of 0.6MPa, the H in the solution is 2 , CO, and part of CO 2 flashed out, the H in the flash gas 2 S content in 1000~1500...

Embodiment 2

[0024] Embodiment 2: a kind of purification process applied to the raw material gas of synthetic ammonia or methanol production, comprises the following steps

[0025] 1. Desulfurization, the shift gas from the shift system (mainly CO, CO 2 、H 2 、H 2 S, CH 4 ) at a pressure of 3.6 MPa, first sent to the lower part of the desulfurization tower, and countercurrently contacted with the hindered amine desulfurization liquid entering the tower from the upper part of the tower, the H in the gas 2 S and some CO 2 absorbed by the solution. Purified gas H from desulfurization tower 2 S content is less than 10mg / Nm 3 , to the decarburization process. After decompression, the hindered amine liquid coming out from the bottom of the desulfurization absorption tower passes through the solution heat exchanger and enters the solution flash tank. Under the pressure of 0.6 MPa, the H in the solution is 2 , CO, and part of CO 2 flashed out, the H in the flash gas 2 S content in 1000~15...

Embodiment 3

[0031] Embodiment 3: a kind of purification process applied to the raw material gas of synthetic ammonia or methanol production, comprises the following steps

[0032] 1. Desulfurization, the shift gas from the shift system (mainly CO, CO 2 、H 2 、H 2 S, CH 4 ) at a pressure of 3.5MPa, first sent to the lower part of the desulfurization tower, and countercurrently contacted with the hindered amine desulfurization liquid entering the tower from the upper part of the tower, the H in the gas 2 S and some CO 2 absorbed by the solution. Purified gas H from desulfurization tower 2 S content is less than 10mg / Nm 3 , to the decarburization process. After decompression, the hindered amine liquid coming out from the bottom of the desulfurization absorption tower passes through the solution heat exchanger and enters the solution flash tank. Under the pressure of 0.5MPa, the H in the solution is 2 , CO, and part of CO 2 flashed out, the H in the flash gas 2 S content in 1000~1500...

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PUM

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Abstract

The invention discloses a purifying technology of raw material of synthetic ammonia or carbinol, which comprises the following steps: setting the pressure of transforming gas from transforming system at 3.4-3.6Mpa; transmitting into the bottom of desulfurizing tower to contact with reflow steric hindrance amine desulfurizing liquid from top of tower; making H2S and partial CO2 adsorbed by solution; decarburizing; entering transforming gas with pressure at 3.3-3.5Mpa from desulfurizing segment into adsorbing tower from the bottom; contacting with reflow MDEA in the tower.

Description

technical field [0001] The invention relates to a coal gas purification treatment technology, in particular to a purification process for raw material gas used in the production of synthetic ammonia or methanol. Background technique [0002] In recent years, most of the newly built methanol and synthetic ammonia plants and gas purification in China adopt the low-temperature methanol washing of German Lurgi Company and the NHD solution gas purification process developed by China, and are equipped with CLAUS sulfur recovery devices. [0003] 1. Low-temperature methanol washing requires the purchase of patent licenses and key equipment, which requires a large investment, which is not conducive to the promotion and use of domestic independent technologies. [0004] 2. The NHD solution gas purification process has domestic intellectual property rights, and the investment is relatively low for methanol washing at low temperature, but the operating cost is high and the absorption c...

Claims

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Application Information

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IPC IPC(8): C01B3/50B01D53/62B01D53/52
CPCY02P20/151
Inventor 董海水马安民王中刚张山泉韩喜民柳小峰吴存仓荆三伟
Owner SHANXI YANGMEI FENGXI FERTILIZER IND GRPCO
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