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A new type of acid gas treatment process method and device

A treatment process, acid gas technology, applied in separation methods, chemical instruments and methods, dispersed particle separation, etc., can solve the problems of difficult storage, long process, and difficult operation of devices

Active Publication Date: 2017-05-17
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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  • A new type of acid gas treatment process method and device
  • A new type of acid gas treatment process method and device
  • A new type of acid gas treatment process method and device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0079] use as figure 1 The shown treatment method and device use acid gas and NaOH solution as raw materials for 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 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.

[0081] 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 circulating back to the secondary reactor and the total reaction product of the secondary reactor is 1:2. The volume flow ratio of the secondary reaction product liquid en...

Embodiment 2

[0084] 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.

[0085] In Example 2, the volume flow ratio of the reaction product liquid recycled 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.

[0086] 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 1:3. The volume flow ratio of the reaction product liquid circula...

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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, which belongs to the field of acid gas purification, and in particular relates to a treatment method and device 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 small refineries. [0003] The treatme...

Claims

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Application Information

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Patent Type & Authority Patents(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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