Low-temperature methanol washing device and method for removing acid gas in synthesis gas

A low-temperature methanol washing and methanol technology, which is applied in hydrogen/synthesis gas production, low-temperature hydrogen separation, climate sustainability, etc., can solve the problems of methanol loss, high energy consumption, and prone to ammonia crystallization, etc., to reduce consumption and reduce Methanol loss, effects of avoiding ammonia crystallization

Active Publication Date: 2017-01-04
SHANGHAI BEINENG CHEM TECH
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] The technical problem to be solved by the present invention is to overcome the defects of high energy consumption, serious loss of methanol and easy occurrence of ammonia crystallization in the low-temperature methanol washing device in the prior art, and provide a low-temperature methanol washing device and a method for removing and synthesizing sour gas method

Method used

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  • Low-temperature methanol washing device and method for removing acid gas in synthesis gas
  • Low-temperature methanol washing device and method for removing acid gas in synthesis gas
  • Low-temperature methanol washing device and method for removing acid gas in synthesis gas

Examples

Experimental program
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Effect test

Embodiment 1

[0047] Embodiment 1 adopts such as figure 2 process shown.

[0048] The feed gas from the upstream conversion unit is mixed with methanol from the methanol-lean water cooler 311 and the recycle gas from the recycle gas compressor 501, and then cooled to -11~-25°C through the feed gas cooler 301. The cooled raw gas enters the raw gas separator 201 for flash separation.

[0049] The absorption tower 101 is divided into four sections of I, II, III, and IV from bottom to top. Section I at the bottom and Section IV at the top. Section I of the absorption tower 101 is a desulfurization section, and sections II to IV of the absorption tower 101 are decarburization sections. The gas phase separated by the feed gas separator 201 enters the bottom of the first section of the absorption tower 101. The top of the first section of the absorption tower 101 uses part of the sulfur-free methanol-rich solution from the second section of the absorption tower 101 as an absorbent. The top o...

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Abstract

The invention discloses a low-temperature methanol washing device and a method for removing acid gas in synthesis gas. A main low-temperature methanol washing process is reconfigured, semi-lean solution methanol is additionally taken as main washing methanol on the basis of an original full-lean solution absorption process, and the dosage of lean solution methanol is decreased by 15%-30%, so that the dosages of thermal regeneration tower reboiler steam, thermal regeneration tower top condenser circulating water, lean methanol water cooler circulating water and H2S concentration tower gas stripping nitrogen are decreased by 15%-30% to achieve the energy saving and yield increasing targets; meanwhile, a traditional three-stage condensation process on a thermal regeneration tower top is canceled, therefore, methanol losses are reduced, and an ammonia crystallization phenomenon is avoided. Energy saving and yield increasing improvement on a traditional low-temperature methanol washing device is also suitable for the newly-built low-temperature methanol washing device.

Description

technical field [0001] The invention relates to the technical field of low-temperature methanol washing and purification synthesis gas treatment, in particular to a low-temperature methanol washing device and a method for removing acid gas in synthesis gas. Background technique [0002] my country's main fossil resources are still dominated by coal. Our country is a typical country with more coal and less gas. At present, coal chemical industry has been relatively mature after years of development. Downstream products come in various forms, and all of them are important basic chemical raw materials. Given the low temperature methanol on H 2 S / CO 2 It has the characteristics of very strong selective absorption capacity and cheap and easy-to-obtain raw materials. Almost all the purification sections of coal chemical enterprises that use coal as raw material are equipped with low-temperature methanol washing sections to remove H in the synthesis gas. 2 S / CO 2 and other co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10K1/16C01B3/52C01B17/16C01B31/20
CPCC01B3/506C01B3/508C01B3/52C01B17/167C01B2203/0415C01B2203/0475C01B2203/0485C10K1/004C10K1/005C10K1/16Y02P20/10
Inventor 章华勇黄锐
Owner SHANGHAI BEINENG CHEM TECH
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