Novel acidic gas treating process and apparatus

A treatment process, acid gas technology, applied in separation methods, chemical instruments and methods, separation of dispersed particles, etc., can solve problems such as difficult promotion, long process, difficult storage, etc.

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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  • Novel acidic gas treating process and apparatus

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0079] Use as figure 1 The treatment method and device shown use acid gas and NaOH solution as raw materials to carry out the reaction. 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%.

[0080] In Example 1, the first-stage reactor and the second-stage reactor adopt a venturi reactor, and the third-stage reactor and the fourth-stage reactor adopt a rotating bed reactor. The venturi reactor and the rotating bed reactor can be in the field General purpose Venturi reactor and rotating bed reactor.

[0081] In Example 1, the volume flow ratio of the reaction product liquid of the second path circulating back 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 circulating back to the secondary reactor to the total reaction product of the secondary reactor is 1:2. The v...

Embodiment 2

[0084] Use as figure 2 The process method and system shown, in Example 2, the primary reactor and secondary reactor are used image 3 The Venturi reactor, the three-stage reactor and the four-stage reactor shown use rotating bed reactors.

[0085] In Embodiment 2, the volume flow ratio of the reaction product circulating back to the first reactor through the absorption liquid inlet of the first reactor to the total reaction product of the first reactor is 5:8. The volume flow ratio of the reaction product circulating back to the first reactor through the circulating liquid inlet of the first reactor to the total reaction product of the first reactor is 5:24.

[0086] The volume flow ratio of the reaction product circulating back to the secondary reactor through the absorption liquid inlet of the secondary reactor to the total reaction product liquid of the secondary reactor is 1:3. The volume flow ratio of the reaction product circulating back to the secondary reactor through the...

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Abstract

The invention provides a novel acidic gas treating process and apparatus. The acidic gas treating 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 primary liquid reaction product and a secondary liquid reaction product are cyclically used, the secondary liquid reaction product is used a tertiary reaction absorption liquid, and an MDEA solution is used as a fourth-stage reaction absorption liquid; thus, the purpose of replacement of CO2 with H2S is achieved, the generation amounts of Na2CO3 and NaHCO3 in a liquid phase product are reduced, precipitation of crystals is prevented, and long cycle operation of the apparatus is guaranteed. The acidic gas treating process provided by the invention is simple and can achieve the dual objectives of purification of acidic gas and reclamation of pollutants.

Description

Technical field [0001] The invention provides an acid gas treatment process and device, belonging to the field of acid gas purification, and in particular relates to a treatment method and device suitable for the purification of sulfur hydride acid gas and the resource utilization of pollutants. Background technique [0002] Refinery acid gas mainly comes from sour water stripping, circulating hydrogen desulfurization, dry gas desulfurization, etc. The acid gas mainly contains H 2 S, CO 2 . At present, the acid gas of most small refineries basically adopts the treatment method of emissions after combustion. On the one hand, this method causes a waste of resources, on the other hand, it puts huge pressure on environmental protection and affects the development space of the enterprise. In order to protect the environment and ensure the full use of resources, it is imperative to recycle the sour gas in small refineries. [0003] The treatment of acid gas in large and medium-sized re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/78B01D53/52B01D53/62
Inventor 方向晨齐慧敏彭德强王璐瑶陈建兵孟凡飞陈新王阳峰
Owner CHINA PETROLEUM & CHEM CORP
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