Low-temperature methanol washing method for low-pressure raw gas

A low-temperature methanol washing, raw gas technology, applied in separation methods, chemical instruments and methods, dispersed particle separation, etc., to achieve the effect of saving investment, expanding the scope of application, and low energy consumption

Active Publication Date: 2011-06-01
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0015] The purpose of the present invention is to solve the problem of how the low-pressure feed gas is suitable for the low-temperature methanol washing and purification process, that is, pre-cooling and pre-washing the feed gas to dehydrate and dry the feed

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  • Low-temperature methanol washing method for low-pressure raw gas

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Embodiment Construction

[0030] The specific embodiments of the present invention will be described in detail below in conjunction with the technical solutions and accompanying drawings.

[0031] The temperature from the transformation process is 40°C, the pressure is 0.70MpaA, and contains H 2 38.95mol%, CO 2 36.79mol%, H 2 S 0.99mol%, H 2 O 1.27mol% low-pressure feed gas is first injected into a small amount of temperature -37.34℃, containing CH3 OH 97.25mol%, CO 2 1.34mol%, H 2 S 0.91mol%, H 2 O0.45mol% semi-lean liquid to prevent the moisture in the raw gas from freezing during the pre-cooling process. The mixed gas is cooled to -20.15°C by the feed gas cooler E-1 and deep cooler E-2, and then enters the separation tank A in the lower part of the pre-washing tower to separate the water and methanol in the feed gas. The separated gas enters the body B of the upper pre-washing tower and is washed with semi-poor solution to remove the moisture in the raw gas. Pre-washed feed gas with temp...

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Abstract

The invention relates to a low-temperature methanol washing method for low-pressure raw gas, belonging to the technical field of gas purification. The method is characterized in that low-pressure raw gas containing H2S, CO2 and water is precooled to low temperature, and is washed with low-temperature partially stripped solvent in a prewashing tower, wherein the low-temperature partially stripped solvent is subjected to gas stripping of a low-temperature methanol washing device; the raw gas subjected to water removal and effective gas recycled in the low-temperature methanol washing device, i.e. circulating flash evaporation gas, converge, and are reheated and compressed, or directly compressed without reheating; and the raw gas, which is compressed to the required pressure, enters the subsequent low-temperature methanol washing device, thereby removing acid gas in the raw gas. The invention solves the problem that the low-pressure raw gas can not be purified by the low-temperature methanol washing technique since the sulfur-bearing water-containing raw gas which is gasified under low pressure can not be directly compressed by a compressor. The invention widens the application range of the low-temperature methanol washing technique, combines the prewashing dehydration technique and the conventional low-temperature methanol washing technique, and has the advantages of low energyconsumption and investment saving.

Description

technical field [0001] The invention belongs to the technical field of gas purification, and relates to a method for removing and recovering acid gas, in particular to removing acid gas by using a low-temperature methanol washing method for low-pressure raw gas. Background technique [0002] The low-temperature methanol washing process (Rectisol) 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 a solvent to remove raw material gas acid gas in. Low-temperature methanol washing purification process can remove H in raw gas 2 S, COS, RSH, CO 2 , HCN, NH 3 , NO, paraffin, aromatic hydrocarbon, crude gas oil and other components, and can be dehydrated to make the gas completely dry, and the absorbed useful components can be recovered in the process of methanol regeneration; at the same time, this process has a high degree of purification, It has the char...

Claims

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Application Information

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IPC IPC(8): B01D53/14
Inventor 张述伟俞裕国王长英管凤宝曲平杜亚明李燕
Owner DALIAN UNIV OF TECH
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