Complexing iron desulfurizing agent for Claus tail gas treatment

A technology of Claus tail gas and complex iron, which is applied in gas treatment, membrane technology, and separation of dispersed particles, can solve problems such as the inability to remove carbonyl sulfide, and achieve significant economic and social benefits, high activity, and improved Effect of Total Sulfur Recovery

Active Publication Date: 2020-03-13
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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  • Complexing iron desulfurizing agent for Claus tail gas treatment
  • Complexing iron desulfurizing agent 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 particularly relates to a complexing iron desulfurizing agent for Claus tail gas treatment, wherein the complexing iron desulfurizing agent comprises the following components: a soluble iron salt, a soluble cerium salt, a chelating agent, an inorganic alkali, an organic additive and water, wherein the weight percentage of the iron ions is 0.5-5% wt, a molar ratio of Fe<3+> to Fe<2+> is 0.5-5.0, the weight percentage of the cerium ions is 0.1-0.5% wt, a molar ratio of the cations to the iron ions in the inorganic alkali is 0.5-1.0, a molar ratio of the chelating agent to the sum of the iron ions and the cerium ions is 1.0-3.5, and the weight percentage of the organic additive is 0.2-2 wt%. The desulfurizing agent can simultaneously remove hydrogen sulfide and carbonyl sulfide in Claus tail gas, wherein the content of the hydrogen sulfide in the purified tail gas after desulfurization is smaller than 10 mg/m<3>, and the content of the carbonyl sulfide in the purified tail gas after desulfurization is smaller than 20 mg/m<3>, so that the national environmental protection standard requirement is met, the cost is low,the desulfurizing agent activity is high, and the desulfurizing effect is good.

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 Applications(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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