Multi-stage countercurrent absorption process and system for acidic gas

A process method and acid gas technology, applied in separation methods, chemical instruments and methods, and separation of dispersed particles, can solve the problems of difficult operation of the device, large investment, and inability to produce valuable fuming sulfuric acid

Active Publication Date: 2015-08-12
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The two-stage Claus + tail gas hydrogenation reduction + solvent absorption technology has mature technology, stable operation, and stable product sulfur quality. However, due to the long process and large investment, the Claus process can only deal with high-concentration acid gases. 2 When the S volume fraction is less than 20%, the device is not easy to operate
This process can only produce 98% industrial sulfuric acid, but cannot produce oleum with higher value. At the same time, due to the difficulty in the transportation and storage of sulfuric acid, the stable market demand near the refinery is an important factor limiting its development.
[0009] CN1836767A discloses a treatment method for sour gas in refineries, utilizing sour gas as the fuel for shaft kilns in cement plants, when the sour gas is burned in the kiln, the H 2 S component reacts chemically with cement material to generate CaSO 4 , other harmful components are also sintered and transformed, which fundamentally solves the problem of acid gas treatment. At the same time, acid gas is used as a gas fuel to make the cement plant energy-saving fuel and achieve the dual purposes of environmental protection and fuel resolution. However, this The method has certain limitations and is not easy to promote
However, the sodium sulfide product of this process is prone to deterioration and is not easy to store

Method used

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  • Multi-stage countercurrent absorption process and system for acidic gas
  • Multi-stage countercurrent absorption process and system for acidic gas
  • Multi-stage countercurrent absorption process and system for acidic gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0076] use as figure 1 The process method and the system shown, react with acid gas and NaOH solution as raw materials. CO in acid gas 2 The volume fraction is 7%, H 2 The volume fraction of S is 92%, and the volume fraction of hydrocarbons is 1%. The mass concentration of NaOH solution is 38%.

[0077] In embodiment 1, primary reactor and secondary reactor adopt Venturi reactor, and tertiary reactor and quaternary reactor adopt rotary bed reactor, and described Venturi reactor and rotary bed reactor can be this field Common Venturi reactors and rotating bed reactors.

[0078] In Example 1, the volume flow ratio of the second reaction product liquid recycled to the primary reactor to the total reaction product liquid of the primary reactor is 5:6. The volume flow ratio of the second reaction product liquid recycled to the secondary reactor to the total reaction product liquid of the secondary reactor is 5:6. The volume flow ratio of the second reaction product liquid rec...

Embodiment 2

[0082] use as figure 2 Shown process method and system, in embodiment 2, primary reactor and secondary reactor adopt image 3 The Venturi reactor shown, the third-stage reactor and the fourth-stage reactor are rotating bed reactors.

[0083] In Example 2, the volume flow ratio of the reaction product liquid circulated back to the primary reactor through the absorption liquid inlet of the primary reactor to the total reaction product liquid of the primary reactor is 5:8. The volume flow ratio of the reaction product liquid circulated back to the primary reactor through the circulating liquid inlet of the primary reactor and the total reaction product liquid of the primary reactor is 5:24.

[0084] The volume flow ratio of the reaction product liquid recycled back to the secondary reactor through the absorption liquid inlet of the secondary reactor and the total reaction product liquid of the secondary reactor is 5:8. The volume flow ratio of the reaction product liquid circu...

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Abstract

The invention provides a multi-stage countercurrent absorption process and system for acidic gas. The absorption process employs a gas-liquid two-phase countercurrent absorption reaction and uses a NaOH solution as an absorption liquid to treat acidic gas so as to produce NaHS. According to the process, a crystallizer and a separator are arranged in a primary reaction and a secondary reaction, and heat is taken out of a reactor; and through filling of the NaOH solution in stages, peak clipping of reaction heat is realized, and local crystallization caused by generation of heat spots is prevented. A combination of a Venturi reactor and a rotating packed bed reactor is used as a reaction apparatus which is flexible to operate and has high mass transfer efficiency. The acidic gas absorption process provided by the invention is simple and can achieve the dual objectives of purification of acidic gas and reclamation of pollutants; and the acidic gas absorption system has the advantages of small scale, low energy consumption and low proneness to obstruction.

Description

technical field [0001] The invention provides a multi-stage countercurrent absorption process method and system for acid gas, which belongs to the field of acid gas purification, and in particular relates to a treatment method and system suitable for the purification of sulfur-containing hydrogen compound acid gas and the recycling of pollutants. Background technique [0002] Refinery acid gas mainly comes from sour water stripping, circulating hydrogen desulfurization, dry gas desulfurization and other devices. The acid gas mainly contains H 2 S, CO 2 . At present, the acid gas in most small refineries basically adopts the treatment method of post-combustion emission. On the one hand, this method causes a waste of resources, on the other hand, it brings huge pressure to environmental protection and affects the development space of enterprises. In order to protect the environment and ensure the full utilization of resources, it is imperative to recycle the acid gas from s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/78B01D53/52B01D53/62
Inventor 彭德强袁中立齐慧敏王璐瑶孟凡飞陈建兵陈新
Owner CHINA PETROLEUM & CHEM CORP
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