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Method for removing hydrogen sulfide through acidic ferric ion solution

A technology of iron ions and hydrogen sulfide, applied in separation methods, chemical instruments and methods, sulfur preparation/purification, etc., can solve problems such as expensive chelating agents, poor quality of sulfur products, and intensified side reactions, and achieve no side reactions , high absorption efficiency and improved purity

Inactive Publication Date: 2015-04-15
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the process has problems such as expensive chelating agent, easy degradation, intensified side reactions and poor product sulfur quality when the sulfur capacity is high.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1 using Fe(NO 3 ) 3 and H 4 PVMo 11 o 40 The solution removes H 2 S

[0023] Preparation of Fe(NO 3 ) 3 9H 2 O (0.0268 mol / l Fe 3+ ) aqueous solution, the pH is 1, and then 0.0061 mol / l of H is added to the solution 4 PVMo 11 o 40 (H 4 PVMo 11 o 40 / Fe molar ratio is 1 / 4.3). Mixed gas composition H 2 S is 10% (V), N 2 is 90% (V). Into the solution at a flow rate of 300 ml / h. After 10h, the conversion rate of sulfur was 98%, Fe 3+ all converted to Fe 2+ . The solution changed from the original orange to dark green, indicating that the heteropolyacid was not significantly reduced. Then the previous solution was regenerated by air for 4 hours, the heating temperature was 80°C, and the Fe 2+ all converted to Fe 3+ . When the mixed gas is fed again under the same conditions as above, the conversion rate of sulfur is 96%. After 4 cycles like this, the oxidation catalytic performance of the solution did not decrease.

Embodiment 2

[0024] Example 2. Using Fe(NO 3 ) 3 and H 6 PV 3 W 9 o 40 The solution removes H 2 S

[0025] Preparation of Fe(NO 3 ) 3 9H 2 O (0.0268 mol / l Fe 3+ ) in aqueous solution with a pH of 1. Then 0.0039 mol / l of H was added to the solution 6 PV 3 W 9 o 40 (H 6 PV 3 Mo 9 o 40 / Fe molar ratio is 1 / 6.9). Mixed gas composition H 2 S is 10% (V), N 2 is 90% (V). Into the solution at a flow rate of 300 ml / h. After 10h, the conversion rate of sulfur was 99%, Fe 3+ all converted to Fe 2+ . The solution changed from the original orange to brown-green, indicating that the heteropolyacid was not significantly reduced. Then the previous solution was regenerated by air for 3 hours, the heating temperature was 80°C, and the Fe 2+ All oxidized to Fe 3+ . When the mixed gas is fed again under the same conditions as above, the conversion rate of sulfur is 98%. After 2 cycles like this, the oxidation catalytic performance of the solution did not decrease.

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Abstract

The invention belongs to the technical field of gas purification and relates to a method for removing hydrogen sulfide through an acidic ferric ion solution. The desulfuration solution mainly contains a ferric salt and a heteropolyacid and has an appropriate pH value being 0-6, wherein the heteropolyacid can be represented as a following general formula HaXVbM(12-b)O40. A desulfuration method comprises following steps: (1) oxidizing H2S to form sulfur elementary substance through Fe<3+> in the solution, wherein the Fe<3+> is reduced into Fe<2+>; (2) oxidizing the Fe<2+> into Fe<3+> through air under a catalytic effect of the heteropolyacid; and (3) circulating the solution containing the ferric salt and the heteropolyacid to remove the H2S. The desulfuration solution can oxidize the H2S to the sulfur elementary substance, is easy to regenerate and can be recycle. The desulfuration method is simple in processes, is high in absorption efficiency, is free of side reactions and allows the sulfur to be recovered easily.

Description

technical field [0001] The invention belongs to the technical field of gas purification, and relates to a method for removing hydrogen sulfide from an acidic iron ion solution. Background technique [0002] Hydrogen sulfide is a very harmful impurity in industrial gases such as petrochemical, natural gas, oilfield development, coke oven gas and semi-water gas. Its existence will not only cause corrosion of equipment and pipelines, but also cause serious harm to the environment, and it is a pollutant that must be eliminated or controlled. [0003] Different hydrogen sulfide content can adopt different processes. When the sulfur concentration in the acid gas is high, the alcohol amine absorption-Claus method desulfurization process is more commonly used. When the concentration of hydrogen sulfide is low or the concentration of hydrogen sulfide is high but the gas flow is not large, the wet redox desulfurization process is widely used. [0004] In the 1970s, the LO-CAT chelat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/78B01D53/86B01D53/52C01B17/05
Inventor 杨建平朱燕俞健健冯亚平龚建琴
Owner CHINA PETROLEUM & CHEM CORP
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