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Complex iron desulfurizer for Claus tail gas treatment

A technology of Claus tail gas and complexed iron, which is applied in the directions of gas treatment, separation methods, and dispersed particle separation, can solve the problems of inability to remove carbonyl sulfide, achieve significant economic and social benefits, and have good desulfurization effect, low cost effect

Active Publication Date: 2022-04-08
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, when this process is applied to the treatment of Claus tail gas, because the Claus tail gas contains some carbonyl sulfide, the existing desulfurizers cannot remove carbonyl sulfide

Method used

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  • Complex iron desulfurizer for Claus tail gas treatment
  • Complex iron desulfurizer for Claus tail gas treatment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A complex iron desulfurizer for treating Claus tail gas, comprising the following components: soluble iron salt, soluble cerium salt, chelating agent, inorganic base, organic additive and water.

[0025] With ferric citrate, Fe(NH 4 ) 2 (SO 4 ) 2 ·6H 2 O is used as a soluble iron salt, cerium sulfate is used as a soluble cerium salt, EDTA is used as a chelating agent, p-benzoquinone is used as an organic additive, and sodium carbonate is used as an inorganic base to prepare a desulfurization solvent. The contents of each component are as follows:

[0026] Iron ions: 4.5%wt, of which Fe 3+ with Fe 2+ The molar ratio of Ce is 3; Ce 3+ : 0.25%wt; the molar ratio of sodium ion to iron ion is 0.8; the molar ratio of EDTA to the sum of iron ion and cerium ion is 2.0; the content of p-benzoquinone is 1.0wt%, and the rest is water.

[0027] The desulfurizer is used to treat Claus tail gas in complex iron desulfurization unit.

Embodiment 2

[0029] A complex iron desulfurizer for treating Claus tail gas, comprising the following components: soluble iron salt, soluble cerium salt, chelating agent, inorganic base, organic additive and water.

[0030] With ferric citrate, Fe(NH 4 ) 2 (SO 4 ) 2 ·6H 2 O is used as a soluble iron salt, cerium sulfate is used as a soluble cerium salt, EDTA is used as a chelating agent, p-benzoquinone is used as an organic additive, and sodium carbonate is used as an inorganic base to prepare a desulfurization solvent. The contents of each component are as follows:

[0031] Iron ions: 0.5%wt, where Fe 3+ with Fe 2+ The molar ratio of Ce is 0.5; Ce3+ : 0.1%wt; the molar ratio of sodium ion to iron ion is 0.5; the molar ratio of EDTA to the sum of iron ion and cerium ion is 1.0; the content of p-benzoquinone is 0.2wt%, and the rest is water.

[0032] The desulfurizer is used to treat Claus tail gas in complex iron desulfurization unit.

Embodiment 3

[0034] A complex iron desulfurizer for treating Claus tail gas, comprising the following components: soluble iron salt, soluble cerium salt, chelating agent, inorganic base, organic additive and water.

[0035] With ferric citrate, Fe(NH 4 ) 2 (SO 4 ) 2 ·6H 2 O is used as a soluble iron salt, cerium sulfate is used as a soluble cerium salt, EDTA is used as a chelating agent, p-benzoquinone is used as an organic additive, and sodium carbonate is used as an inorganic base to prepare a desulfurization solvent. The contents of each component are as follows:

[0036] Iron ions: 5.0%wt, where Fe 3+ with Fe 2+ The molar ratio of Ce is 5.0; Ce 3+ : 0.5%wt; the molar ratio of sodium ion to iron ion is 1.0; the molar ratio of EDTA to the sum of iron ion and cerium ion is 3.5; the content of p-benzoquinone is 2wt%, and the rest is water.

[0037] The desulfurizer is used to treat Claus tail gas in complex iron desulfurization unit.

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Abstract

The invention belongs to the technical field of gas purification, and in particular relates to a complex iron desulfurizer used for Claus tail gas treatment. Contains the following components: soluble iron salt, soluble cerium salt, chelating agent, inorganic base, organic additive and water; wherein the weight percentage of iron ion is 0.5‑5%wt, and Fe 3+ with Fe 2+ The molar ratio of cerium ions is 0.5-5.0; the weight percentage of cerium ions is 0.1-0.5%wt; the molar ratio of cations and iron ions in the inorganic base is 0.5-1.0; the molar ratio of the chelating agent to the sum of iron ions and cerium ions is 1.0 ‑3.5; the weight percentage of the organic additive is 0.2‑2wt%. The desulfurizer can remove hydrogen sulfide and carbonyl sulfide in the Claus tail gas at the same time, and the hydrogen sulfide content in the purified tail gas after desulfurization is less than 10mg / m 3 , carbonyl sulfide content is less than 20mg / m 3 , meet the requirements of national environmental protection standards, low cost, high activity of desulfurizer, good desulfurization effect.

Description

technical field [0001] The invention belongs to the technical field of gas purification, and in particular relates to a complex iron desulfurizer used for Claus tail gas treatment. Background technique [0002] my country's "Petroleum Refining Industrial Pollutant Discharge Standard (GB31570-2015)" issued on April 16, 2015 stipulates that the sulfur plant flue gas SO 2 The emission concentration limit is generally required to reach 400mg / Nm 3 Below, key areas require to reach 100mg / Nm 3 Below; and sulfur tail gas SO 2 Emissions are also one of the important indicators in the verification and accounting of total pollutants by the Ministry of Environmental Protection. New sulfur plants will be implemented on July 1, 2015, and old sulfur plants will be implemented on July 1, 2017. There are more than 300 sets of sulfur plants in China. In order to meet the discharge standards, a new sulfur recovery process needs to be developed to reduce the sulfur dioxide emissions from the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/48B01D53/78B01D53/86B01D53/52
CPCB01D53/8612B01D53/485B01D53/78B01D2257/308B01D2255/20738
Inventor 徐翠翠刘爱华刘剑利陶卫东常文之刘增让吕才山张艳松郝国杨
Owner CHINA PETROLEUM & CHEM CORP
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