Method for reducing sulfur content in sulfur recovery device tail gas

A technology for sulfur recovery and sulfur content, applied in separation methods, air quality improvement, chemical instruments and methods, etc., can solve the problems of limited absorption selectivity, limited processing load of the device, insufficient removal degree, etc., and reduce the co-absorption rate. , the effect of increasing the processing load and increasing the concentration

Inactive Publication Date: 2018-09-25
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The object of the invention is to aim at the H in the current Claus sulfur recovery unit tail gas absorption treatment process 2 S, COS and other sulfides are not sufficiently removed at low pressure, the processing load of the device is limited, and the H in the acid gas after the absorption liquid is regenerated 2 Low concentration of S, CO 2 H 2 In the case of limited selectivity for S uptake, a method is proposed that can improve H at low pressure 2 The degree of removal of sulfides such as S, H in the regenerated acid gas 2 Absorbents and methods for S concentration and plant handling load, while not making major changes to existing absorbing plants

Method used

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  • Method for reducing sulfur content in sulfur recovery device tail gas
  • Method for reducing sulfur content in sulfur recovery device tail gas
  • Method for reducing sulfur content in sulfur recovery device tail gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The conditions of the exhaust gas used in the test are the same as those in Comparative Example 1. The absorption liquid is prepared with an aqueous solution with a mass fraction of 30% based on the polyamide-amine molecular structural formula b mentioned in the above specification as the absorption liquid. The temperature of the absorption liquid entering the absorption tower is 29~31°C, and the temperature at the bottom of the rich liquid regeneration tower is 100~101°C . During the test, the circulation volume of the solution was fixed, and the test results under the conditions of different gas-liquid ratios (i.e. processing load) were shown in formula 1 in Table 2.

Embodiment 2

[0033] The conditions of the exhaust gas used in the test are the same as those in Comparative Example 1. The absorption liquid is prepared as an aqueous solution with a total mass fraction of 30% of polyamide-amine molecular structure b and MDEA as the absorption liquid, wherein the mass fraction of b is 3%, and MDEA is 27%. The temperature of the absorption liquid entering the absorption tower is 29~31°C, and the bottom temperature of the rich liquid regeneration tower is 100~101°C. During the test, the circulation volume of the solution was fixed, and the test results under the conditions of different gas-liquid ratios (that is, processing load) were shown in formula 2 in Table 2.

Embodiment 3

[0035] The conditions of the exhaust gas used in the test are the same as those in Comparative Example 1. The absorption liquid is prepared with the modified polyamide-amine molecular structure formula d whose mass fraction is 30% as mentioned in the above description. The temperature at the bottom of the tower is 100~101°C. During the test, the circulation volume of the solution was fixed, and the test results under the conditions of different gas-liquid ratios (i.e. processing load) were shown in formula 3 in Table 2.

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Abstract

The invention belongs to the technical field of waste gas pollutant control. In the prior art, the environmental protection management on the tail gas discharge sulfides of the Claus sulfur recovery device is increasingly strict, and the treatment of H2S, COS and other sulfides in Claus tail gas by using the absorption method has disadvantages. Based on the problems in the prior art, the inventionprovides a new solution scheme. According to the present invention, by adopting the functional absorption liquid and the preferred process parameters, the absorbent and the method capable of improving the removal degree of H2S and other sulfides, reducing the CO2 co-adsorption rate and improving the H2S concentration in the regeneration acid gas in the case of no change of the original pressure of the tail gas, ie., under the low pressure, can be provided while the treatment load of the device can be increased.

Description

technical field [0001] The invention relates to a method for reducing the sulfur content in tail gas of a Claus sulfur recovery device, and belongs to the technical field of waste gas pollutant control. Background technique [0002] The Claus process is commonly used at home and abroad to convert a large amount of sulfur-containing industrial mixed gas produced in industrial processes such as petroleum refining and processing, sulfur-containing natural gas purification treatment, coal gasification to synthesis gas, and metallurgical coking into sulfur for sulfur element depletion. Recycle. The sulfur compounds contained in these industrial gas mixtures are represented by hydrogen sulfide (H 2 S) mainly, supplemented by a small amount of organic sulfur such as carbon-based sulfur and mercaptan, which are toxic, even highly toxic, and odorous substances and cannot be discharged directly. In addition, sulfur itself is also a resource with multiple uses. [0003] Because the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/14
CPCB01D53/1425B01D53/1468B01D53/1493B01D2252/204B01D2257/304B01D2257/308Y02A50/20
Inventor 毛松柏周志斌朱道平陈园园杨绪甲余勇宋丽
Owner CHINA PETROLEUM & CHEM CORP
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