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A kind of carbonyl sulfide efficient solvent removal and preparation method thereof

A technology for removing solvents and carbonyl sulfide, which is applied in the field of desulfurization, can solve the problems that the purified gas is difficult to reach the new standard of natural gas, and the total sulfur content of natural gas exceeds the standard, and achieve the effects of enhancing physical solubility, efficient removal, and increasing selectivity

Active Publication Date: 2021-10-15
CHINA PETROLEUM ENG CORP LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] With the continuous improvement of environmental requirements, the requirements for the total sulfur content of natural gas are becoming more and more stringent. Most natural gas purification plants use traditional amine desulfurization devices, and it is difficult for the purified gas to meet the new standard for natural gas. The culprit of exceeding the standard, in order to solve the problem of natural gas purification plant transformation caused by the new standard, a new high-efficiency decarbonylation solvent must be selected

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  • A kind of carbonyl sulfide efficient solvent removal and preparation method thereof

Examples

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Effect test

Embodiment 1

[0028] A carbonyl sulfide efficient solvent removal, comprising the following components (in mass percent): N-methyldiethanolamine 30%, N, N-dibenzylethanolamine 6%, tert-butyldiethanolamine 12%, N- Thialdehyde-aminoacetic acid-tert-butyl ester 30%, (S)-3-(hydroxymethyl)pyrrolidine 1%, polyether modified silicone 0.5%, thiodipropionic acid 0.3%, imidazoline 0.2 %, deionized water 20%, and the total mass percentage is 100%.

[0029] The preparation method of carbonyl sulfide efficient solvent removal comprises the following steps:

[0030] (1) Weigh the above-mentioned alcohol amine solvent and special-effect solvent in a stirring tank, and mix evenly at 30° C.;

[0031] (2) Weigh the above-mentioned activator, defoamer, antioxidant, and corrosion inhibitor into the stirring tank described in step (1), stir and mix evenly, and obtain a high-efficiency decarbonylation sulfide solvent.

[0032] The above solution is used for the purification of natural gas with high carbonyl su...

Embodiment 2

[0034] A carbonyl sulfide efficient solvent removal, comprising the following components (by mass ratio): 25% of N-methyldiethanolamine, 3% of N,N-dibenzylethanolamine, 17% of tert-butyldiethanolamine, thio Diethyl aminomalonate 33%, (S)-3-(hydroxyethyl)pyrrolidine 1%, polyether modified silicone 0.5%, naphthalene polyfen 1%, Mannlich base 0.5%, deionized water 25%, the sum of the total mass percentages is 100%, and the solvent acid gas load is 0.56mol (H 2 S+CO 2 ) / mol amine.

[0035] The preparation method is the same as in Example 1.

[0036] The above solution is used for the purification of natural gas with high carbonyl sulfide. The natural gas with high carbonyl sulfide consists of (in molar ratio): 85% methane, 2% ethane, 6.50% hydrogen sulfide, 6.46% carbon dioxide, 145ppm carbonyl sulfide, methyl sulfide Alcohol 98ppm, ethanethiol 50ppm, propanethiol 33ppm, methyl sulfide 19ppm, carbon disulfide 23ppm, thiophene 22ppm. In the purified gas, hydrogen sulfide 1ppm, ...

Embodiment 3

[0038] A carbonyl sulfide efficient solvent removal, comprising the following components (by mass ratio): N-methyldiethanolamine 22%, N, N-dibenzylethanolamine 6%, tert-butyldiethanolamine 20%, N- Thialdehyde-aminoacetic acid-tert-butyl ester 30%, (S)-3-(hydroxyethyl)pyrrolidine 1%, polyether modified silicone 0.5%, naphthalene polyphenol 1%, quaternary ammonium salt 0.5%, Deionized water 17%.

[0039] The preparation method is the same as in Example 1.

[0040] The above solution is used for the purification of natural gas with high carbonyl sulfide. The natural gas with high carbonyl sulfide consists of (in molar ratio): 85% methane, 2% ethane, 6.25% hydrogen sulfide, 6.71% carbon dioxide, 153ppm carbonyl sulfide, methyl sulfide Gas purification of alcohol 97ppm, ethanethiol 52ppm, propylene mercaptan 31ppm, methyl sulfide 18ppm, carbon disulfide 19ppm, thiophene 20ppm, in the purified gas, hydrogen sulfide 2ppm, carbon dioxide 2.2%, carbonyl sulfide 7ppm, methylmercaptan 1...

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Abstract

The invention relates to a solvent for carbonyl sulfide removal with high efficiency and a preparation method thereof. The desulfurization solvent includes the following raw materials in mass percent: 20% to 50% of alcohol amine solvent, 10% to 40% of special effect solvent, 1% to 6% activator, 0.2%-3% other additives composed of defoamer, antioxidant and corrosion inhibitor in a mass ratio of 3-10:6:3-4. Compared with traditional desulfurization solvents, this desulfurization solvent can not only be used for the removal of conventional sulfur-containing substances such as hydrogen sulfide and mercaptan, but also can ensure that the carbonyl sulfide gas containing The removal rate of carbonyl sulfide in high carbonyl sulfide natural gas is over 95%, and it can ensure that the total sulfur content of the purified gas is less than 19mg / m 3 In the following, the high carbonyl sulfide gas can fully meet the requirement that the residual sulfur in the purified natural gas be less than 20mg / m without using a carbonyl sulfide hydrolysis device. 3 national standard.

Description

technical field [0001] The technical field of desulfurization of the present invention relates to a method for removing high carbonyl sulfide content in natural gas, specifically a carbonyl sulfide efficient removal solvent and a preparation method thereof. Background technique [0002] With the development of national economy, natural gas also plays an indispensable role in residents' life and industrial production. The main components of natural gas are methane-based alkanes (containing a small amount of ethane, propane, etc.), in addition to carbon dioxide, water, hydrogen sulfide, organic sulfur and other impurities. Among them, hydrogen sulfide and organic sulfur are a kind of colorless, poisonous and pungent flammable gas. Their existence will not only cause corrosion to transportation pipelines and equipment used, but also pose a serious threat to people's life safety. In addition, in Industrial production can also lead to poisoning of various catalysts, which affect...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/48
CPCC10L3/103C10L2290/541
Inventor 刘棋梁宇成韩敏汤国军赵启龙赵兴涛祁亚玲曹文浩兰林陈娟张玉明赵海龙
Owner CHINA PETROLEUM ENG CORP LTD