A new process for treating acid gas containing ammonia, carbonyl sulfide and hydrogen sulfide and recovering sulfur

A sulfur recovery and acid gas technology, applied in the chemical industry, gas treatment, sulfur compounds, etc., can solve problems such as inability to process, low sulfur recovery rate, and failure to meet industrial sulfur standards, and achieve a wide range of applications and sulfur content. Low, environmentally friendly effect

Active Publication Date: 2018-08-31
HUALU ENG & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Among the currently disclosed methods, the sulfur recovery processes such as Super Claus and Super Claus, which are mainly based on Claus, are difficult to directly meet the requirements of the existing emission standards, and complex iron is used as a catalyst to absorb and oxidize H 2 The process of S has complete absorption, H in the tail gas 2 Low S content, high sulfur recovery rate, etc., but it cannot handle NH 3 and organic sulfur acid gases such as COS, which will lead to NH 3 The sulfur emitted during the sulfur filtration stage and recovered by the complex iron oxidation method is all aqueous sulfur slurry, which does not meet the industrial sulfur standard

Method used

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  • A new process for treating acid gas containing ammonia, carbonyl sulfide and hydrogen sulfide and recovering sulfur
  • A new process for treating acid gas containing ammonia, carbonyl sulfide and hydrogen sulfide and recovering sulfur

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Embodiment 1

[0029] Such as figure 1 As shown, the acid gas (101) enters the Claus combustion furnace (2) after passing through the water washing tower (1) to remove ammonia, and the reacted process gas enters the waste heat boiler (3) for waste heat recovery, and produces low-pressure steam as a by-product. The recovered process gas enters the hydrolysis reactor (4) after preheating, and the COS and CS generated by the reaction in the Claus furnace are hydrolyzed 2 , the process gas from the hydrolysis reactor passes through the primary sulfur condenser (5), the primary Claus reactor (6), the secondary sulfur condenser (7), the secondary Claus reactor (8), In the third-stage condenser (9), when the liquid sulfur (104) is discharged from the first-stage, second-stage, and third-stage sulfur condensers, low-pressure steam is produced as a by-product. The process gas from the third-stage condenser passes through the hydrogenation reactor (10) after being preheated, and the hydrogenated proc...

Embodiment 2

[0031] Such as figure 2 As shown, the acid gas (101) is preheated after being removed from the ammonia by the water washing tower (1), and enters the hydrolysis reactor (4) to hydrolyze the COS contained in the raw acid gas, and the process gas exiting the hydrolysis reactor passes through the process gas cooler (11) enter the absorption oxidation reaction chamber (12) after being cooled to 40~60 ℃, and the H 2 S is converted into elemental sulfur, the complexed iron catalyst is reduced by the air fed in, and the absorbed tail gas (107) is discharged up to the standard. The generated wet sulfur is filtered through the filter (13), the sulfur is sent to the magma tank (14), and the filtrate (108) is returned to the absorption oxidation reaction chamber (12). Sulfur and water form a sulfur slurry in the melt tank and send it to the sulfur melting kettle (15), and after melting, send it to the separator (16) to separate high-purity sulfur (104), and the water layer goes to the ...

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Abstract

The present invention discloses a novel method for processing ammonia, carbonyl sulfide and hydrogen sulfide-containing acid gases, and recycling the sulfur. According to the method, the measures of washing to remove ammonia, Claus combustion, hydrolysis reaction, Claus reaction, hydrogenation reaction, absorption and oxidation reaction, and sulfur refining are combined. According to the composition of acid gases, the technological process is flexibly selected, and the heat of acid gases is recovered. Therefore, the purposes of energy saving and emission reduction are realized. The method can be used for purifying acid gases of different compositions. After being processed, the tail gas can be discharged directly. Meanwhile, the high-quality sulfur can be recovered, and the sulfur recovery rate is more than 99.95%.

Description

technical field [0001] The invention relates to the field of purifying acid gas containing hydrogen sulfide, in particular to a novel process for treating acid gas containing ammonia, carbonyl sulfide and hydrogen sulfide and recovering sulfur. Background technique [0002] In the process of coal chemical industry, oil and natural gas processing, a large amount of H 2 S acid gas. For example, the H generated from the low-temperature methanol washing section in the coal chemical industry 2 S concentrated gas, acid gas from the sour water stripping section of the refinery, etc. H in these acid gases 2 The concentration of S is very different, and the concentration of impurities such as carbonyl sulfide and ammonia is also different. With the increasingly prominent environmental protection problems, the national emission standards are becoming more and more stringent. The current "Petroleum Refining Industry Pollutant Discharge Standard" requires that SO 2 Special emission...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/75C01B17/04B01D53/78B01D53/40
CPCB01D53/40B01D53/78B01D2257/304B01D2257/308B01D2257/406C01B17/0408Y02P20/10Y02P20/129Y02P20/50
Inventor 王向新周丹黎唐建业张翔尚剑赵中
Owner HUALU ENG & TECH
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