High-selectivity desulfurization system and compounding method of desulfurization agent of high-selectivity desulfurization system

A desulfurization system and high-selectivity technology, applied in separation methods, chemical instruments and methods, gas fuels, etc., can solve the problems of low desulfurization purification degree, high viscosity, secondary pollution, etc., and achieve fast absorption speed and large absorption capacity. , The effect of low regeneration energy consumption

Inactive Publication Date: 2017-06-13
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the common medium and high pressure absorbing H 2 The S method usually includes: low-temperature methanol washing method, alcohol amine method, and propylene carbonate method. The common problems of these methods are that the capture energy consumption and cost are high, and the quality of sulfur element is poor, which may cause secondary pollution.
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  • High-selectivity desulfurization system and compounding method of desulfurization agent of high-selectivity desulfurization system

Examples

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Effect test

Embodiment 1

[0013] at a certain 50,000 Nm 3 / h (liquefied natural gas, CO 2 / H 2 S=20:1, molar ratio) desulfurization device selects the highly selective desulfurization system and its desulfurizer (MDEA content is 41wt%; DES content is 2wt%; water content is 57wt%) according to the present invention for desulfurization. The desulfurization system consists of an absorption tower, a heat exchanger and a desorption tower. A double-layer wire mesh corrugated packing with a diamond-shaped flow window is used. The operating pressure of the absorption tower is 2.6MPa and the temperature is 70°C; the operating pressure of the desorption tower is 0.15MPa and the temperature 110°C; H in qualified gas after selective desulfurization 2 The S content is 9ppm, and the H that enters the sulfur recovery unit after analysis 2 S gas recovery rate is 82% and CO 2 The content is 18ppm.

Embodiment 2

[0015] at a certain 50,000 Nm 3 / h (liquefied natural gas, CO 2 / H 2 S=30:1, molar ratio) desulfurization device selects the highly selective desulfurization system and its desulfurizer (MDEA content is 42wt%; DES content is 3wt%; water content is 55wt%) according to the present invention for desulfurization. The desulfurization system consists of an absorption tower, a heat exchanger and a desorption tower. A double-layer wire mesh corrugated packing with a diamond-shaped flow window is used. The operating pressure of the absorption tower is 2.6MPa and the temperature is 70°C; the operating pressure of the desorption tower is 0.15MPa and the temperature 110°C; H in qualified gas after selective desulfurization 2 The S content is 7ppm, and the H entering the sulfur recovery unit after analysis 2 S gas recovery rate is 85% and CO 2 The content is 15ppm.

Embodiment 3

[0017] at a certain 50,000 Nm 3 / h (liquefied natural gas, CO 2 / H 2 S=40:1, molar ratio) desulfurization device selects the highly selective desulfurization system and its desulfurizer (MDEA content is 48wt%; DES content is 4wt%; water content is 48wt%) according to the present invention for desulfurization. The desulfurization system consists of an absorption tower, a heat exchanger and a desorption tower. A double-layer wire mesh corrugated packing with a diamond-shaped flow window is used. The operating pressure of the absorption tower is 2.6MPa and the temperature is 70°C; the operating pressure of the desorption tower is 0.15MPa and the temperature 110°C; H in qualified gas after selective desulfurization 2 The S content is 5ppm, and the H that enters the sulfur recovery unit after analysis 2 S gas recovery rate is 88% and CO 2 The content is 12ppm.

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Abstract

The present invention provides a high-selectivity eutectic compounding desulfurization agent, and relates to high selectivity removal of sulfides from acid gases during chemical industry production. The system comprises an absorption unit, a rich and poor liquid heat exchange unit and a desorption unit. The desulfurization absorber is a high-selectivity desulfurization compounding solvent, and is formed by compounding 40-50 wt% of N-methyldiethanolamine (MDEA), 1-5 wt% of an eutectic solvent (DES), and 45-59 wt% of water. According to the present invention, the eutectic solvent is firstly used for the removal of industrial gas H2S, wherein the H2S content after desulfurization is less than 10 ppm (the H2S recovery rate of the sulfur recovery apparatus is more than 80% and the CO2 content is less than 20 ppm); the desulfurization system has advantages of high purification degree, large absorption capacity, low regenerative energy consumption, and the like; and the eutectic desulfurization agent is non-toxic, green, and environmentally friendly, and high economic and social benefits are provided.

Description

technical field [0001] The invention relates to the technical field of desulfurization of coke oven gas, natural gas and other industrial gases, in particular to a high-selectivity desulfurization system and a compounding method of the desulfurizer. Background technique [0002] In industrial processes such as the purge gas in the production of synthetic ammonia or methanol, the associated gas produced in petroleum refining, and the purification of natural gas, a considerable amount of acid gas is often produced, and its main component is H 2 S, CO 2 , where H 2 Although the S content is not high, it will seriously endanger the survival of earth organisms and human health. On the one hand, the H in the process gas 2 If the removal of S is not clean, it will not only corrode the equipment and poison the catalyst, but also threaten the safety of personnel. On the other hand, H 2 S is another important sulfur resource, and the recycled H 2 S can be used to produce sulfuri...

Claims

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Application Information

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IPC IPC(8): B01D53/78B01D53/52C10L3/10
CPCB01D53/52B01D53/78B01D2257/304C10L3/103
Inventor 白芳李静华超陆平
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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