Improved process for treating gases containing hydrogen sulfur and sulfur dioxide

A technology for sulfur dioxide and gas treatment, used in chemical instruments and methods, organic compound/hydride/coordination complex catalysts, separation methods, etc.

Inactive Publication Date: 2006-10-04
INST FR DU PETROLE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is no change in the amount of by-products formed compared to the implementation of the treatment described in patent FR-B-1,592,092

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] Embodiment 1 (according to prior art)

[0066] The catalytic system is sodium salicylate at a concentration of 100 mmol / kg.

[0067] In this example, degradation of the catalytic system resulted in the formation of Na 2 SO 4 , which is soluble in PEG400 (1.2 mmol / kg solubility at 125°C).

[0068] Thus, precipitation occurs with the formation of this salt. The amount of salt formed over time was determined by quantification of residual sodium ions dissolved in PEG400.

[0069] The technique used for this quantification is capillary electrophoresis. Between the amount of sodium ions lost by precipitation and the converted H 2 There is a linear relationship between the S quantities.

[0070] Therefore, in this example, every mole of H converted 2 S, just make 1.5mmolNa + Precipitate, while by each mol converted H 2 S forms 0.75 mmol Na 2 SO 4 .

Embodiment 2

[0071] Embodiment 2 (according to the present invention)

[0072] The catalytic system consisted of 100 mmol / kg of salicylic acid (compound providing functional group A) in the presence of 100 mmol / kg diethanolamine (compound providing functional group B).

[0073] In this example, degradation of the catalytic system resulted in the formation of protonated diethanolamine sulfate. The solubility of this salt in PEG400 is higher than that of Na 2 SO 4 Larger, the solvent did not reach saturation within the time of the experiment.

[0074] Therefore, the formation of protonated diethanolamine sulphate was monitored by quantifying the sulphate ion dissolved in PEG400. The technique used for this quantification is capillary electrophoresis. As in Example 1, it is clear that the sulfate ion formed and the converted H 2 There is a linear relationship between the S quantities.

[0075] The results obtained are as follows: For every 1 mol of H converted 2 S, 0.088 mmol of proton...

Embodiment 3

[0077] Embodiment 3 (according to the present invention)

[0078] The catalytic system consisted of 100 mmol / kg salicylic acid in the presence of 100 mmol / kg 2-methylimidazole.

[0079] In this example, degradation of the catalytic system resulted in the formation of protonated 2-methylimidazolium sulfate. The solubility of this salt in PEG400 is greater than that of Na 2 SO 4 . Saturation was not reached throughout the experimental period. Therefore, the formation of protonated 2-methylimidazolium sulfate was monitored by quantifying the sulfate ion dissolved in PEG400. The technique used for this quantification is capillary electrophoresis. As in Examples 1 and 2, it is clear that the sulfate ion formed and the converted H 2 There is a linear relationship between the S quantities.

[0080] The results obtained are as follows: For every 1 mol of H converted 2 S, 0.096 mmol of protonated 2-methylimidazolium sulfate was formed.

[0081] Thus, in this example, the salts...

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PUM

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Abstract

A process for treating a gas containing hydrogen sulphide (H2S) and sulphur dioxide (SO2) is described in which: said gas is brought into contact at a suitable temperature with an organic solvent containing at least a soluble catalytic system, comprising at least one compound comprising at least one functional group A consisting of a carboxylic acid function and at least one functional group B comprising at least one nitrogen atom and which can produce an acid-base type reaction with at least one functional group A under the operating conditions of said process; a gaseous effluent substantially depleted in hydrogen sulphide and sulphur dioxide is recovered, along with liquid sulphur separated from the solvent by liquid-liquid decantation; said catalytic system which is employed slowing by-product formation.

Description

technical field [0001] The present invention relates to a process for treating gas streams containing hydrogen sulfide and sulfur dioxide. [0002] The object of the present invention is a process for the treatment of gas streams containing hydrogen sulphide and sulfur dioxide using an organic solvent containing a catalytic system capable of slowing down the formation of by-products during said treatment. [0003] Another object of the invention is the catalytic system used in this process. [0004] The method according to the invention can be used, for example, to treat effluents from the Claus process. But it applies more generally to a variety of gases containing hydrogen sulfide and sulfur dioxide. h 2 S and / or SO 2 It is not necessary to be in gaseous form, and one or both of these gases may initially be present in a dissolved state in the solvent containing the catalytic system of the present invention. [0005] The Claus process is widely used, especially in oil re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B17/05B01D53/48B01D53/86
CPCC01B17/05B01J31/04B01J31/0244B01J31/0222B01J31/0237B01D53/8615B01J31/0218
Inventor P·-L·卡雷特B·德福特S·德罗兹德兹L·雷纳尔
Owner INST FR DU PETROLE
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