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Organic amine absorption liquid for removing acid substances in airflow

A technology of acidic substances and organic amines, applied in the field of absorbing liquid based on cyclic group organic amines, can solve the problems of irreversible reaction, solvent loss, poor removal effect of organic sulfur, etc.

Active Publication Date: 2018-02-13
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The alcohol amine solvent used in the traditional chemical absorption process can only partially remove carbonyl sulfide COS and mercaptan RSH, the removal efficiency is extremely low, or the reaction is irreversible, resulting in solvent loss, and the overall removal effect on organic sulfur Not good, especially when the organic sulfur content is high, it is usually difficult to ensure that the total sulfur content in the purified gas meets the standard
[0004] The removal of thiol RSH in industrial applications is generally physical dissolution and chemical reaction dissolution, the reaction mechanism of thiol RSH and alcohol amine is relatively simple, and H 2 S is similar to the reaction of alcohol amines, but with the increase of the carbon chain in the mercaptan RSH, its properties are close to those of alkanes with the same carbon, and its acidity itself is weak, so the activity of reacting with alcohol amines is low, and alcohol amines react preferentially with other acidic gases Therefore, the dissolution or reaction removal of RSH is reduced

Method used

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  • Organic amine absorption liquid for removing acid substances in airflow
  • Organic amine absorption liquid for removing acid substances in airflow
  • Organic amine absorption liquid for removing acid substances in airflow

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Composition of raw material gas to be treated: hydrogen sulfide ~7.5% (mol), carbon dioxide ~6% (mol), methyl mercaptan ~350mg / Nm 3 , carbonyl sulfide~500mg / Nm 3 .

[0022] The composition of the absorption liquid: 30% (wt) of diisopropanolamine, 5% (wt) of 4,5-dihydroxyimidazole, 15% (wt) of N-acetylimidazole, and the circulation volume of the absorption liquid is 5L / h.

[0023] The absorption pressure in this implementation case is 2.8MPa, and the composition of the purified gas after treatment is as follows:

[0024]

Embodiment 2

[0026] Composition of raw material gas to be treated: hydrogen sulfide ~7.5% (mol), carbon dioxide ~6% (mol), methyl mercaptan ~350mg / Nm 3 , carbonyl sulfide~500mg / Nm 3 .

[0027] The composition of the absorption liquid: 30% (wt) N-methyldiethanolamine, 5% (wt) 1-methyl-2-ethylimidazole, 15% (wt) N-acetylimidazole, the circulation volume of the absorption liquid is 5L / h.

[0028] The absorption pressure in this implementation case is 3.2MPa, and the composition of the purified gas after treatment is as follows:

[0029]

Embodiment 3

[0031] Composition of raw material gas to be treated: hydrogen sulfide ~7.5% (mol), carbon dioxide ~6% (mol), methyl mercaptan ~350mg / Nm 3 , carbonyl sulfide~500mg / Nm 3 .

[0032] The composition of the absorption liquid: 40% (wt) of N-methyldiethanolamine, 5% (wt) of 2-methyl-5-ethylpyridine, 15% (wt) of N-methylpyrrolidone, the circulation volume of the absorption liquid is 5L / h.

[0033] The absorption pressure in this implementation case is 6.0MPa, and the composition of the purified gas after treatment is as follows:

[0034]

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Abstract

The invention belongs to the technical field of gas purification, and relates to organic amine absorption liquid for removing acid substances in the airflow based on annular groups. By aiming at the requirements and the characteristics of organic sulfur compound removal, compounds containing nitrogen ring type groups are added into an organic amine absorbent as catalysts in the absorbent, so thatacid substances including organic sulfur in the airflow are removed; carbonyl sulfide and thioalcohol in the raw material gas can be well removed at the same time; the total sulfur content in the purified gas after the removal is lower than 60mg / Nm<3>; the index of first-grade commodity natural gas is reached. The absorption liquid is applicable to coke oven gas, natural gas, refinery gas and smoke gas.

Description

technical field [0001] The invention belongs to the technical field of gas purification, and relates to an absorption liquid based on a cyclic group organic amine for removing acidic substances from gas streams. The acidic substances that can be removed by the absorption liquid include carbon dioxide, hydrogen sulfide, carbonyl sulfide and sulfur Alcohol (such as methyl mercaptan, ethanethiol, propylene mercaptan, etc.), the absorption liquid is suitable for coke oven gas, natural gas, refinery gas and flue gas. Background technique [0002] As a kind of green energy, natural gas plays an increasingly important role in my country's economic development and energy structure adjustment. During the 12th Five-Year Plan period, my country formulated industrial incentive policies to vigorously develop the natural gas industry. While importing natural gas, we must actively carry out domestic natural gas production. mining and development. The natural gas fields that have been devel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/14B01D53/86B01D53/48
CPCB01D53/1462B01D53/1487B01D53/8606B01D2252/20489
Inventor 杨绪甲朱道平毛松柏
Owner CHINA PETROLEUM & CHEM CORP
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