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A process and device for purifying h2s in industrial tail gas

A chemical tail gas and process technology, applied in chemical instruments and methods, hydrogen sulfide, inorganic chemistry, etc., can solve the problems of hydrogen sulfide gas loss, low hydrogen sulfide concentration, large loss, etc., to achieve improved utilization, environmental friendliness, and safety sex high effect

Active Publication Date: 2018-06-22
四川蜀道装备科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Chinese patent CN201310109589 discloses a treatment method for industrial tail gas containing hydrogen sulfide, which uses chemical methods to use hydrogen sulfide in the tail gas to produce fluorescent grade zinc sulfide powder. This treatment method cannot obtain pure hydrogen sulfide, and there will be about 20% loss of hydrogen sulfide gas
The patent is mainly aimed at the low-temperature methanol washing system for synthetic ammonia, and does not mention the H 2 S tail gas is purified, and methanol is highly toxic. The tail gas washed with low-temperature methanol in natural gas contains more than 5% hydrocarbons. If the method in this patent is used, the hydrocarbons cannot be recovered and the loss is large
Chinese patent 201510376268 discloses a method to increase the concentration of acid gas hydrogen sulfide and carbonyl sulfide in the low-temperature methanol washing process, which is also a method of using methanol absorption, and the concentrated hydrogen sulfide concentration is low, and the highest can only reach 44%

Method used

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  • A process and device for purifying h2s in industrial tail gas
  • A process and device for purifying h2s in industrial tail gas

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Effect test

Embodiment 1

[0027] like figure 1 As shown, the feed gas is the hydrogen sulfide tail gas of natural gas NHD desulfurization process, containing 20% ​​hydrogen sulfide, 56% carbon dioxide, 9.5% hydrocarbons, water and other trace components of the feed gas:

[0028] A method for purifying H in industrial tail gas 2 The process of S, comprising the following steps:

[0029] S1, after filtering the feed gas, combine with the H from the top of the deheavy hydrocarbon tower 10 2 The mixed gas of S and propane exchanges heat in the raw material heat exchanger 1, pressurizes it to 1.5-5.0 MPa with the raw material compressor 2, and sends it to the raw material gas drying system 3 for drying and dehydration;

[0030] S2, pressurized and dried feed gas in step S1 and CO-enriched gas from the top of decarbonization tower 5 2 After exchanging heat in the gas-to-gas heat exchanger 4, the gas is sent to the decarbonization tower 5 for rectification, and the CO-enriched gas is separated. 2 Componen...

Embodiment 2

[0043] The raw material gas is the hydrogen sulfide tail gas of the low-temperature methanol washing process of natural gas, containing 13% hydrogen sulfide, 63% carbon dioxide, 9.7% hydrocarbons, and other trace components of the raw gas:

[0044] A method for purifying H in industrial tail gas 2 The process of S, comprising the following steps:

[0045] S1, after filtering the feed gas, combine with the H from the top of the deheavy hydrocarbon tower 10 2 The mixed gas of S and propane is heat-exchanged in the raw material heat exchanger 1, and pressurized to 1.5-5.0 MPa by the raw material compressor 2;

[0046] S2. Combining the raw material gas pressurized in step S1 with the CO-enriched gas from the top of the decarbonization tower 5 2 After exchanging heat in the gas-to-gas heat exchanger 4, the gas is sent to the decarbonization tower 5 for rectification, and the CO-enriched gas is separated. 2 Components with lower boiling points such as gas and nitrogen are separa...

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Abstract

The invention relates to a technique for purifying H2S in chemical exhaust gas, which comprises the following steps: charging a raw gas enter into a device; drying, filtering and pressurizing, and then charging into a decarburization tower; separating CO2 and N2 from local light dydrocarbon CO2-enriched gas and H2S-enriched solution; throttling and depressurizing the H2S-enriched solution and then charging into a heavy hydrocarbon removing tower; removing majority hydrocarbon in the heavy hydrocarbon removing tower; feeding the pentane and benzene-containing heavy hydrocarbon liquid at higher boiling point acquired at the bottom of the tower into a heavy hydrocarbon storage tank, wherein H2S and propane are the main components at the tower top; reheating the mixed gas at the tower top and then feeding into a MDEA absorbing system for removing propane, thus obtaining H2S gas; drying, thus obtaining the H2S product. The invention also discloses the device for implementing the technique. The invention has the advantages that the effective components in the chemical exhaust gas are separated, the product H2S gas is obtained, and meanwhile, heavy hydrocarbon and high-purity propane gas by-products are obtained, the use ratio of the exhaust gas is increased, the energy is conserved, the emission is reduced, the waste is turned into wealth, all the chemical absorbers are non-toxic and noncombustible, the safety is high and the environment is protected.

Description

technical field [0001] The invention relates to the field of gas purification, in particular to a method for purifying H in industrial tail gas 2 S process and apparatus. Background technique [0002] Hydrogen sulfide is a colorless, toxic gas with the smell of rotten eggs. The hydrogen sulfide gas contained in the chemical tail gas can not only cause poisoning of pipelines and catalysts and deterioration of process conditions, but also cause quite serious environmental pollution and even endanger human survival. Hydrogen sulfide is a valuable raw material in the chemical industry in energy, chemical industry, medicine, agriculture and other aspects. Therefore, rational use of hydrogen sulfide to turn waste into treasure has very important practical significance in actual production. [0003] H from chemical exhaust gas 2 S can be used to produce elemental sulfur by the Claus process, and can also be used as raw material gas for the production of dimethyl disulfide (DMDS...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D3/00B01D53/14B01D53/26C01B17/16
CPCB01D3/00B01D53/14B01D53/26C01B17/168Y02C20/40Y02P20/151Y02P70/10
Inventor 刘彩平
Owner 四川蜀道装备科技股份有限公司