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Absorbent for cyclically absorbing sulfur dioxide gas in natural gas tail gas and its application

A sulfur dioxide and absorbent technology, applied in gas treatment, chemical instruments and methods, separation methods, etc., can solve the problems of unfavorable regenerated acid gas subsequent utilization, lower absorption efficiency, equipment corrosion, etc., and achieve favorable subsequent utilization and solvent performance The effect of stabilization and reduction of purification cost

Active Publication Date: 2019-10-25
CHINA PETROLEUM ENG CORP LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] above SO 2 The absorbent is absorbing SO 2 There are following problems during: (1) acid-base SO 2 The absorbing fluid is absorbing SO 2 At the same time, it is easy to cause corrosion of the equipment; (2) the N-H bond is easily oxidized, thereby reducing the absorption capacity of the absorbent; (3) when absorbing SO 2 At the same time, it does not effectively avoid the absorption of CO in the exhaust gas 2 The absorption of acid gas will make SO 2 The absorption capacity of the absorbent becomes smaller, and the absorption capacity of the absorbent for SO 2 The absorption efficiency will decrease quickly, resulting in an increase in solvent circulation, which is also not conducive to the subsequent utilization of regenerated acid gas; (4) The absorbent absorbs sulfur dioxide to form a relatively stable structure, and the high desorption temperature results in high energy consumption
So far, there has been no report on SO in natural gas tail gas 2 Absorbent

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] In terms of mass percentage, the absorbent for circulating and absorbing sulfur dioxide gas in natural gas tail gas in this embodiment includes the following components: 50wt% of hexamethylenetetramine, 5wt% of 2-(2-diethylaminoethoxy)ethanol , 20wt% of 1,3-dimethyl-2-imidazolidinone, 0.5wt% of coconut oil fatty acid acyldiethanolamine, 1wt% of hydroquinone, 2wt% of sodium gluconate and the rest of water.

[0037] Use this absorbent at a temperature of 55°C for SO 2 It can desulfurize 0.3wt% natural gas tail gas, the desulfurization time is 30min, and the desulfurization rate is 95.1%. Extraction absorbs SO 2 100ml of rich desulfurization solution was desorbed and regenerated at a temperature of 85°C. After 30 minutes of desorption experiment, the desorption rate was 96.3%.

[0038] The simulated absorption and desorption experiment of the absorbent: the above-mentioned absorbent of the present embodiment is placed in the gas absorption device and the gas absorption d...

Embodiment 2

[0040] In terms of mass percentage, the absorbent for circulating and absorbing sulfur dioxide gas in natural gas tail gas in this embodiment includes the following components: 30wt% of N-methylcaprolactam, 6wt% of 2-(2-diethylaminoethoxy)ethanol and 4wt% of 2-(2-tert-butylamino) propoxyethanol, 30wt% of 1,3-dimethyl-2-imidazolidinone, 1wt% of coconut oil fatty acyldiethanolamine, 1wt% of terephthalate Phenol, 2wt% sodium gluconate and the balance of water.

[0041] Use this absorbent at a temperature of 35 °C for SO 2 It can desulfurize 0.1wt% natural gas tail gas, the desulfurization time is 30min, and the desulfurization rate is 96.3%. Extraction absorbs SO 2 100ml of rich desulfurization solution was desorbed and regenerated at a temperature of 90°C. After 30 minutes of desorption experiment, the desorption rate was 95.9%.

[0042] The simulated absorption and desorption experiment of the absorbent: the above-mentioned absorbent of the present embodiment is placed in th...

Embodiment 3

[0044] In terms of mass percentage, the absorbent for circulating and absorbing sulfur dioxide gas in natural gas tail gas in this embodiment includes the following components: 40wt% triethylenediamine, 10wt% 2-(2-diethylaminoethoxy)ethanol, 15wt% % of 1,3-dimethyl-3,4,5,6-tetrahydro-2-pyrimidinone and 10 wt% of 1,3-dimethyl-3,4,5,6-tetrahydro-2- Pyrimidinone, 1.5wt% coconut oil fatty acid acyldiethanolamine, 2wt% hydroquinone, 2wt% sodium gluconate and the rest of water.

[0045] This absorbent was used at a temperature of 30 °C for SO 2 It can desulfurize 0.2wt% natural gas tail gas, the desulfurization time is 30min, and the desulfurization rate is 96.1%. Extraction absorbs SO 2 100ml of rich desulfurization solution was desorbed and regenerated at a temperature of 90°C. After 30 minutes of desorption experiment, the desorption rate was 97.2%.

[0046] The simulated absorption and desorption experiment of the absorbent: the above-mentioned absorbent of the present embodi...

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PUM

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Abstract

The invention discloses an absorbent for circularly absorbing sulfur dioxide gas in tail gas of natural gas and an application of the absorbent. The absorbent comprises the following components in percentage by mass: 30-60wt% of cyclic tertiary amine compounds, 5-10wt% of a desulfurization fortifier, 10-30wt% of a latent solvent, 0.5-3wt% of an activating agent, 1-2wt% of an antioxidant, 0.5-2wt% of a corrosion inhibitor and the balance of water. The application refers to applying the absorbent to removal of the sulfur dioxide gas in the tail gas of the natural gas at an absorption temperature of 20-70 DEG C. According to the invention, by utilizing the structure characteristics of the cyclic tertiary amine compounds which are high in sulfur dioxide absorption capacity and low in desorption energy consumption, and adding corresponding auxiliary agents at the same time, the absorption of absorption liquid to sulfur dioxide has high efficiency and specificity; and the absorbent can selectively remove SO2 from the tail gas of the natural gas, so as to greatly reduce the gas purification cost, and facilitate follow-up utilization of recycled acid gas.

Description

technical field [0001] The invention belongs to the technical field of environmental protection and gas purification, and more specifically relates to an absorbent for circularly absorbing sulfur dioxide gas in natural gas tail gas and its application. Background technique [0002] Sulfur dioxide is a colorless gas with a strong pungent smell. It is one of the main air pollutants at present. It will cause great harm to human health and the environment. It is also one of the main causes of severe weather such as acid rain and smog in recent years. With the rapid development of my country's economy, the scale of major industries such as thermal power, mineral smelting, and oil and gas extraction and refining has increased year by year. In the production process, SO 2 Mainly polluting gas emissions surged simultaneously. Since 1995, my country surpassed Europe and the United States to become the world's SO 2 The country with the largest emission, the urban ambient air SO with...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/14
CPCB01D53/1425B01D53/1481B01D53/1493B01D2252/20431B01D2252/2053B01D2257/302
Inventor 周明宇刘棋杜通林陈运强梁宇成秦兴述陈彰兵汤晓勇蒲远洋肖秋涛程林张政游龙杜明志黄维光李波马艳琳李建汤智昀兰林马先汤国军
Owner CHINA PETROLEUM ENG CORP LTD
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