CN110876881B - Complex iron desulfurizer for claus tail gas treatment - Google Patents
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8603—Removing sulfur compounds
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
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Abstract
The invention belongs to the technical field of gas purification, and particularly relates to a complex iron desulfurizer for treating Claus tail gas. Comprises the following components: soluble ferric salt, soluble cerium salt, chelating agent, inorganic base, organic additive and water; wherein the weight percentage of iron ions is 0.5-5% wt, and Fe3+With Fe2+The molar ratio of (A) is 0.5-5.0; the weight percentage of cerium ions is 0.1-0.5 wt%; the molar ratio of cations to iron ions in the inorganic base is 0.5-1.0; the molar ratio of the chelating agent to the sum of the iron ions and the cerium ions is 1.0-3.5; the weight percentage of the organic additive is 0.2-2 wt%. The desulfurizer can simultaneously remove hydrogen sulfide and carbonyl sulfide in the Claus tail gas, and the content of hydrogen sulfide in the purified tail gas after desulfurization is less than 10mg/m3The content of carbonyl sulfide is less than 20mg/m3The desulfurizer has the advantages of meeting the requirements of national environmental protection standards, low cost, high activity of the desulfurizer and good desulfurization effect.
Description
Technical Field
The invention belongs to the technical field of gas purification, and particularly relates to a complex iron desulfurizer for treating Claus tail gas.
Background
Emission standards of pollutants for oil refining industry (GB31570-2015) issued at 16.4.4.2015 in China: flue gas SO of sulfur device2The emission concentration limit value is required to reach 400mg/Nm in general areas3In the following, the requirement of the key area is 100mg/Nm3The following; and sulfur tail gas SO2The emission is also one of important indexes in the checking and accounting of the total pollutant amount of the ministry of environmental protection, a newly-built sulfur device 2015 is executed from 7 months and 1 days, and an old sulfur device is executed from 2017 months and 1 days. The residual 300 sulphur devices in the domestic existing sulphur device are required to be developed to reduce the emission of sulfur dioxide in the device for realizing the emission up to the standard. With the increasing attention of the country to environmental protection, environmental protection is supervised to become the normality, a low-emission new technology is developed, the problem which needs to be solved urgently at present by a sulfur recovery device is solved, and the fundamental guarantee of the survival of enterprises is also provided.
Claus + reduction absorption process is mostly adopted in the conventional sulfur recovery process in China, and the process has the problems of complex flow and large energy consumption loss. Tail gas SO after acid gas treatment by Claus combustion method2The emission concentration is up to thousands of ppm, the industrial tail gas which is still required to be hydrogenated, absorbed, desorbed, concentrated and combusted is reprocessed to reach the emission standard of the tail gas, obviously, the Claus reduction absorption tail gas treatment process comprises the following steps: long process flow, large energy consumption loss, serious alcohol amine decomposition and corrosion, over-standard tail gas, serious secondary pollution and the like. In addition, the alcohol amine absorption method is used for treating high CO2With contents of Claus tail gas, CO is also present2The co-absorption is serious, and the absorption effect of the hydrogen sulfide is influenced. After being absorbed by a reduction absorption system, the sulfur in the purified tail gas is vulcanizedThe hydrogen and carbonyl sulfide content is still as high as hundreds of ppm, and the existing emission standard cannot be met. Therefore, the traditional Claus + reduction absorption process is limited by thermodynamics and chemical balance, and is only optimized by the Claus process, so that the environmental protection requirement that the emission concentration of the sulfur dioxide in the flue gas is less than 100 milligrams per cubic meter is difficult to realize even if the total sulfur recovery rate reaches 99.5 percent.
In recent years, the LO-CAT aqueous phase wet desulphurization technology which takes the complex iron as the active ingredient is applied to industrial production. The LO-CAT process is an environmental protection type sulfur recovery new process developed by ARI technology company in America, and the device is operated at normal temperature and can process several mg/m3H with different contents to 100%2S gas is suitable for a small-scale sulfur recovery device with the yield of 0.2-20 t/d, the sulfur recovery rate is high and can reach more than 99.9 percent, and H in the treated purified gas2The mass concentration of S can reach 10mg/m3The following. The LO-CAT process is a low-energy-consumption sulfur recovery process, has high gas purification degree, good product sulfur quality, low consumption, wide application range, large operation flexibility, easy control and operation, and no influence on the treatment effect of CO in gas2The content influences. The tail gas absorption system in the existing sulfur recovery device is replaced by the technology, so that the tail gas of the sulfur recovery device can be discharged up to the standard, and the energy consumption of the device can be reduced. However, the desulfurization catalyst in the process core technology always depends on import, the period of the product feeding is long, and meanwhile, part of analysis and detection items need to be carried out abroad or standard reagents are provided abroad, so that the operation cost is high and the analysis and the test are inconvenient. Therefore, the localization of the complex iron catalyst is beneficial to the vigorous popularization of the technology, and the standard emission of a sulfur recovery device can be met. In addition, when the process is applied to the treatment of the Claus tail gas, the existing desulfurizer can not realize the removal of the carbonyl sulfide because the Claus tail gas contains part of the carbonyl sulfide.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a complex iron desulfurizer for treating Claus tail gas, which can simultaneously treat hydrogen sulfide and carbonyl sulfide in the Claus tail gas and use the hydrogen sulfide and the carbonyl sulfide in a sulfur recovery device for treating the Claus tail gas by adopting an LO-CAT processThe desulfurizer can purify the hydrogen sulfide in the tail gas to be less than 10mg/m3Carbonyl sulfide less than 20mg/m3Thereby reducing the sulfur emission of the sulfur recovery device and improving the total sulfur recovery rate of the device.
The complex iron desulfurizer for treating the Claus tail gas comprises the following components: soluble ferric salt, soluble cerium salt, chelating agent, inorganic base, organic additive and water; wherein the weight percentage of the iron ions is 0.5-5wt%, and the weight percentage of the cerium ions is 0.1-0.5 wt%; the molar ratio of cations to iron ions in the inorganic base is 0.5-1.0; the molar ratio of the chelating agent to the sum of the iron ions and the cerium ions is 1.0-3.5; the weight percentage of the organic additive is 0.2-2 wt%.
Soluble iron salts to provide Fe3+And Fe2+，Fe3+And Fe2+Is 0.5 to 5.0.
Providing Fe in soluble iron salts3+Is Fe2(SO4)3，FeNH4(SO4)2·12H2O, ferric citrate and ferric ammonium citrate.
Providing Fe in soluble iron salts2+Is FeSO4、Fe(NH4)2(SO4)2·6H2O、2(C2H3O2) One or more of Fe.
Fe3+With Fe2+Is 0.5 to 5.0.
The soluble cerium salt is one or more of cerium nitrate, cerium sulfate and cerium acetate.
The chelating agent may be one or more of EDTA, HEDTA, sorbitol, citric acid, sulfosalicylic acid, gluconic acid, tartaric acid, triethanolamine.
The organic additive is quinone substances, and the quinone substances are one or more of p-benzoquinone, o-benzoquinone, naphthoquinone and phenanthrenequinone. The organic additive is quinone substances, and is used as an oxygen scavenger, so that the absorption of oxygen can be promoted, the regeneration reaction of a desulfurizing agent is facilitated, and the removal effect of hydrogen sulfide is enhanced.
The inorganic base is one or more of sodium carbonate, sodium bicarbonate, ammonium carbonate, potassium hydroxide, potassium carbonate, sodium hydroxide and ammonia water.
The complex iron desulfurizer for treating the Claus tail gas has the following desulfurization mechanism: converting hydrogen sulfide in the Claus tail gas into elemental sulfur by taking the complex iron as a catalyst, thereby removing the hydrogen sulfide; the cerium is used as an active component to hydrolyze carbonyl sulfide in the Claus tail gas into hydrogen sulfide, and the hydrogen sulfide is further converted into elemental sulfur under the action of the complex iron catalyst.
The complex iron desulfurizer for treating the Claus tail gas is suitable for an LO-CAT complex iron desulfurization device, and the complex iron desulfurization device at least comprises complex iron absorption equipment, a complex iron oxidation regenerator and sulfur particle separation equipment.
When the desulfurizer of the invention is used for treating Claus tail gas, the content of hydrogen sulfide in the purified tail gas after desulfurization is less than 10mg/m3The content of carbonyl sulfide is less than 20mg/m3Effectively reducing the tail gas sulfur emission of the sulfur recovery device.
Compared with the prior art, the invention has the following advantages:
(1) the complex iron desulfurizer for treating the Claus tail gas is mainly suitable for purifying the Claus tail gas of a sulfur device in the industries of petroleum refining, natural gas purification, coal chemical industry and the like, is particularly suitable for a sulfur recovery device for treating the Claus tail gas by adopting an LO-CAT process, and has the advantages of low cost, high activity of the desulfurizer, good desulfurization effect and the like.
(2) The desulfurizer of the invention can simultaneously remove hydrogen sulfide and carbonyl sulfide in Claus tail gas, and can simultaneously remove hydrogen sulfide and carbonyl sulfide in tail gas under the action of active components of iron and cerium in the desulfurizer, and the content of hydrogen sulfide in purified tail gas after desulfurization is less than 10mg/m3The content of carbonyl sulfide is less than 20mg/m3Thereby reducing the sulfur emission of the sulfur recovery device, improving the total sulfur recovery rate of the device, reducing the energy consumption of the device and meeting the requirements of national environmental protection standards.
(3) Under the condition that the environmental protection standard is increasingly improved, the successful development of the desulfurizer can effectively reduce the sulfur emission of a sulfur recovery device, and has remarkable economic and social benefits.
Detailed Description
The present invention will be further described with reference to the following examples.
Example 1
A complex iron desulphuriser for claus tail gas treatment comprising the following components: soluble ferric salt, soluble cerium salt, chelating agent, inorganic base, organic additive and water.
With ferric citrate, Fe (NH)4)2(SO4)2·6H2The desulfurization solvent is prepared by taking O as a soluble ferric salt, cerium sulfate as a soluble cerium salt, EDTA as a chelating agent, p-benzoquinone as an organic additive and sodium carbonate as an inorganic base, and the content of each component is as follows:
iron ions: 4.5% wt of Fe3+With Fe2+Is 3; ce3+: 0.25% wt; the molar ratio of sodium ions to iron ions is 0.8; the molar ratio of EDTA to the sum of iron ions and cerium ions was 2.0; the content of p-benzoquinone is 1.0 wt%, and the balance is water.
The desulfurization agent is used for treating the Claus tail gas on a complex iron desulfurization device.
Example 2
A complex iron desulphuriser for claus tail gas treatment comprising the following components: soluble ferric salt, soluble cerium salt, chelating agent, inorganic base, organic additive and water.
With ferric citrate, Fe (NH)4)2(SO4)2·6H2The desulfurization solvent is prepared by taking O as a soluble ferric salt, cerium sulfate as a soluble cerium salt, EDTA as a chelating agent, p-benzoquinone as an organic additive and sodium carbonate as an inorganic base, and the content of each component is as follows:
iron ions: 0.5% wt, wherein Fe3+With Fe2+Is 0.5; ce3+: 0.1% wt; the molar ratio of sodium ions to iron ions is 0.5; the molar ratio of EDTA to the sum of iron ions and cerium ions was 1.0; the content of p-benzoquinone is 0.2 wt%, and the balance is water.
The desulfurization agent is used for treating the Claus tail gas on a complex iron desulfurization device.
Example 3
A complex iron desulphuriser for claus tail gas treatment comprising the following components: soluble ferric salt, soluble cerium salt, chelating agent, inorganic base, organic additive and water.
With ferric citrate, Fe (NH)4)2(SO4)2·6H2The desulfurization solvent is prepared by taking O as a soluble ferric salt, cerium sulfate as a soluble cerium salt, EDTA as a chelating agent, p-benzoquinone as an organic additive and sodium carbonate as an inorganic base, and the content of each component is as follows:
iron ions: 5.0% wt of Fe3+With Fe2+Is 5.0; ce3+: 0.5% wt; the molar ratio of sodium ions to iron ions is 1.0; the molar ratio of EDTA to the sum of iron ions and cerium ions was 3.5; the content of p-benzoquinone is 2wt%, and the balance is water.
The desulfurization agent is used for treating the Claus tail gas on a complex iron desulfurization device.
Example 4
A complex iron desulphuriser for claus tail gas treatment comprising the following components: soluble ferric salt, soluble cerium salt, chelating agent, inorganic base, organic additive and water.
With ferric citrate, Fe (NH)4)2(SO4)2·6H2The desulfurization solvent is prepared by taking O as a soluble ferric salt, cerium sulfate as a soluble cerium salt, EDTA as a chelating agent, benzoquinone as an organic additive and sodium carbonate as an inorganic base, and the content of each component is as follows:
iron ions: 2.0% wt of Fe3+With Fe2+Is 4.0; ce3+: 0.35% wt; the molar ratio of sodium ions to iron ions is 0.9; the molar ratio of EDTA to the sum of iron ions and cerium ions was 1.5; benzoquinone content 0.5wt%, the balance water.
The desulfurization agent is used for treating the Claus tail gas on a complex iron desulfurization device.
Example 5
A complex iron desulphuriser for claus tail gas treatment comprising the following components: soluble ferric salt, soluble cerium salt, chelating agent, inorganic base, organic additive and water.
The method comprises the following steps of preparing a desulfurization solvent by using ferric sulfate and ferrous sulfate as soluble ferric salts, cerium nitrate as soluble cerium salts, citric acid as a chelating agent, naphthoquinone as an organic additive and KOH as an inorganic base, wherein the content of each component is as follows:
iron ions: 3.5% wt of Fe3+With Fe2+Is 4.0; ce3+: 0.4% wt; the molar ratio of potassium ions to iron ions is 0.7; the molar ratio of citric acid to the sum of iron ions and cerium ions was 2.5; the naphthoquinone content is 1.5 wt%, and the balance is water.
The desulfurization agent is used for treating the Claus tail gas on a complex iron desulfurization device.
Example 6
A complex iron desulphuriser for claus tail gas treatment comprising the following components: soluble ferric salt, soluble cerium salt, chelating agent, inorganic base, organic additive and water.
With FeNH4(SO4)2·12H2O、Fe(NH4)2(SO4)2·6H2Preparing a desulfurization solvent by taking O as a soluble iron salt, cerium acetate as a soluble cerium salt, tartaric acid as a chelating agent, phenanthrenequinone as an organic additive and ammonia water as an inorganic base, wherein the desulfurization solvent comprises the following components in percentage by weight:
iron ions: 2.5% wt of Fe3+With Fe2+Is 2.5; ce3+: 0.2% wt; the molar ratio of ammonium ions to iron ions is 0.6; the molar ratio of tartaric acid to the sum of iron ions and cerium ions was 1.5; 0.8 wt% of phenanthrenequinone, and the balance of water.
The desulfurization agent is used for treating the Claus tail gas on a complex iron desulfurization device.
Example 7
A complex iron desulphuriser for claus tail gas treatment comprising the following components: soluble ferric salt, soluble cerium salt, chelating agent, inorganic base, organic additive and water.
With ferric ammonium citrate, 2 (C)2H3O2) Fe is used as a soluble iron salt, cerium acetate is used as a soluble cerium salt, triethanolamine is used as a chelating agent, o-benzoquinone is used as an organic additive, sodium hydroxide is used as an inorganic base, and a desulfurization solvent is prepared, wherein the content of each component is as follows:
iron ions: 4.5% wt of Fe3+With Fe2+Is 3; ce3+: 0.30% wt; the molar ratio of sodium ions to iron ions is 0.8; the molar ratio of the triethanolamine to the sum of the iron ions and the cerium ions is 2.0; the o-benzoquinone content is 1.0 wt%, and the balance is water.
The desulfurization agent is used for treating the Claus tail gas on a complex iron desulfurization device.
Example 8:
a complex iron desulphuriser for claus tail gas treatment comprising the following components: soluble ferric salt, soluble cerium salt, chelating agent, inorganic base, organic additive and water.
With iron sulfate, 2 (C)2H3O2) Fe is used as a soluble iron salt, cerium sulfate is used as a soluble cerium salt, sulfosalicylic acid is used as a chelating agent, p-benzoquinone is used as an organic additive, potassium carbonate is used as an inorganic base, and a desulfurization solvent is prepared, wherein the content of each component is as follows:
iron ions: 4.0% wt of Fe3+With Fe2+Is 3; ce3+: 0.35% wt; the molar ratio of potassium ions to iron ions is 0.8; the molar ratio of sulfosalicylic acid to the sum of iron ions and cerium ions is 2.0; the content of p-benzoquinone is 1.0 wt%, and the balance is water.
The desulfurization agent is used for treating the Claus tail gas on a complex iron desulfurization device.
Example 9:
a complex iron desulphuriser for claus tail gas treatment comprising the following components: soluble ferric salt, soluble cerium salt, chelating agent, inorganic base, organic additive and water.
With FeNH4(SO4)2·12H2O, sulfuric acid sulfiteThe method comprises the following steps of preparing a desulfurization solvent by using iron as a soluble iron salt, cerium sulfate as a soluble cerium salt, EDTA (ethylene diamine tetraacetic acid) and triethanolamine as chelating agents, p-benzoquinone as an organic additive and sodium carbonate and sodium hydroxide as inorganic bases, wherein the desulfurization solvent comprises the following components in percentage by weight:
iron ions: 4.5% wt of Fe3+With Fe2+Is 3; ce3+: 0.30% wt; the molar ratio of sodium ions to iron ions is 0.8; the molar ratio of EDTA and triethanolamine chelating agent to the sum of iron ions and cerium ions was 2.0; the content of p-benzoquinone is 1.0 wt%, and the balance is water.
The desulfurization agent is used for treating the Claus tail gas on a complex iron desulfurization device.
Example 10:
a complex iron desulphuriser for claus tail gas treatment comprising the following components: soluble ferric salt, soluble cerium salt, chelating agent, inorganic base, organic additive and water.
With ferric ammonium citrate, 2 (C)2H3O2) Fe is used as a soluble iron salt, cerium acetate is used as a soluble cerium salt, sorbitol and gluconic acid are used as chelating agents, naphthoquinone is used as an organic additive, potassium carbonate and potassium hydroxide are used as inorganic bases, and a desulfurization solvent is prepared, wherein the content of each component is as follows:
iron ions: 4.5% wt of Fe3+With Fe2+Is 3; ce3+: 0.30% wt; the molar ratio of potassium ions to iron ions is 0.8; the molar ratio of the sorbitol and the gluconic acid chelating agent to the sum of the iron ions and the cerium ions is 2.0; the naphthoquinone content is 1.0 wt%, and the balance is water.
The desulfurization agent is used for treating the Claus tail gas on a complex iron desulfurization device.
Example 11:
a complex iron desulphuriser for claus tail gas treatment comprising the following components: soluble ferric salt, soluble cerium salt, chelating agent, inorganic base, organic additive and water.
With iron sulfate, Fe (NH)4)2(SO4)2·6H2O as a soluble iron salt and cerium sulfate asThe desulfurization solvent is prepared by using soluble cerium salt, EDTA and HEDTA as chelating agents, naphthoquinone as organic additives and ammonium carbonate and ammonia water as inorganic bases, and comprises the following components in percentage by weight:
iron ions: 4.5% wt of Fe3+With Fe2+Is 3; ce3+: 0.30% wt; the molar ratio of ammonium ions to iron ions is 0.8; the molar ratio of EDTA and HEDTA chelating agent to the sum of iron ions and cerium ions was 2.0; the naphthoquinone content is 1.0 wt%, and the balance is water.
The desulfurization agent is used for treating the Claus tail gas on a complex iron desulfurization device.
Example 12:
a complex iron desulphuriser for claus tail gas treatment comprising the following components: soluble ferric salt, soluble cerium salt, chelating agent, inorganic base, organic additive and water.
With ferric sulfate, FeNH4(SO4)2·12H2O, ferrous sulfate, Fe (NH)4)2(SO4)2·6H2The desulfurization solvent is prepared by taking O as a soluble iron salt, cerium sulfate as a soluble cerium salt, EDTA as a chelating agent, naphthoquinone as an organic additive and sodium carbonate as an inorganic base, and the content of each component is as follows:
iron ions: 4.5% wt of Fe3+With Fe2+Is 3; ce3+: 0.30% wt; the molar ratio of sodium ions to iron ions is 0.8; the molar ratio of the EDTA chelating agent to the sum of the iron ions and the cerium ions is 2.0; the naphthoquinone content is 1.0 wt%, and the balance is water.
The desulfurization agent is used for treating the Claus tail gas on a complex iron desulfurization device.
Comparative example 1:
a complex iron desulphuriser for claus tail gas treatment comprising the following components: soluble iron salt, chelating agent, inorganic base, organic additive and water.
With ferric citrate, Fe (NH)4)2(SO4)2·6H2O as a soluble iron salt, EDTA as a chelating agent, p-benzoquinone as an organic additive, sodium carbonate asPreparing a desulfurization solvent for inorganic alkali, wherein the content of each component is as follows:
iron ions: 4.5% wt of Fe3+With Fe2+Is 3; the molar ratio of sodium ions to iron ions is 0.8; the molar ratio of EDTA to iron ions is 2.0; the content of p-benzoquinone is 1.0 wt%, and the balance is water.
The desulfurization agent is used for treating the Claus tail gas on a complex iron desulfurization device.
Comparative example 2:
a complex iron desulphuriser for claus tail gas treatment comprising the following components: soluble ferric salt, soluble cerium salt, chelating agent, inorganic base and water.
With ferric citrate, Fe (NH)4)2(SO4)2·6H2The desulfurization solvent is prepared by taking O as a soluble ferric salt, EDTA as a chelating agent, cerium sulfate as a soluble cerium salt and sodium carbonate as an inorganic base, and the content of each component is as follows:
iron ions: 0.5% wt, wherein Fe3+：Fe2+Is 0.5; ce3+: 0.1% wt; the molar ratio of sodium ions to iron ions is 0.5; the molar ratio of EDTA to iron ions is 1.0; the balance of water.
The desulfurization agent is used for treating the Claus tail gas on a complex iron desulfurization device.
Comparative example 3:
the Claus tail gas is treated by adopting a conventional alcohol amine reduction absorption process.
Claus tail gas treated with the above examples and comparative examples H2The S content is 3.2%, the carbonyl sulfide content is 150ppm, and the specific desulfurization effect is shown in Table 1.
TABLE 1
Claims (6)
1. The utility model provides a complex iron desulfurizer for claus tail gas treatment which characterized in that: comprises the following components: soluble ferric salt, soluble cerium salt, chelating agent, inorganic base, organic additive and water; wherein the weight percentage of the iron ions is 0.5-5wt%, and the weight percentage of the cerium ions is 0.1-0.5 wt%; the molar ratio of cations to iron ions in the inorganic base is 0.5-1.0; the molar ratio of the chelating agent to the sum of the iron ions and the cerium ions is 1.0-3.5; the weight percentage of the organic additive is 0.2-2 wt%; soluble iron salts to provide Fe3+And Fe2+；
The soluble cerium salt is one or more of cerium nitrate, cerium sulfate and cerium acetate;
the organic additive is quinone substances;
the quinone substance is one or more of p-benzoquinone, o-benzoquinone, naphthoquinone and phenanthrenequinone.
2. The complex iron desulfurization agent for claus tail gas treatment according to claim 1, characterized in that: fe3+And Fe2+Is 0.5 to 5.0.
3. The complex iron desulfurization agent for claus tail gas treatment according to claim 2, characterized in that: providing Fe in soluble iron salts3+Is Fe2(SO4)3，FeNH4(SO4)2·12H2O, ferric citrate and ferric ammonium citrate.
4. The complex iron desulfurization agent for claus tail gas treatment according to claim 2, characterized in that: providing Fe in soluble iron salts2+Is FeSO4、Fe(NH4)2(SO4)2·6H2O、2(C2H3O2) One or more of Fe.
5. The complex iron desulfurization agent for claus tail gas treatment according to claim 1, characterized in that: the chelating agent is one or more of EDTA, HEDTA, sorbitol, citric acid, sulfosalicylic acid, gluconic acid, tartaric acid, and triethanolamine.
6. The complex iron desulfurization agent for claus tail gas treatment according to claim 1, characterized in that: the inorganic base is one or more of sodium carbonate, sodium bicarbonate, ammonium carbonate, potassium hydroxide, potassium carbonate, sodium hydroxide and ammonia water.
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| CN112430480B (en) * | 2020-11-13 | 2021-10-01 | 上海逐源机械科技有限公司 | Gas fine desulfurization method |
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