Efficient solvent for removing thioether and thiophene and application thereof

A thiophene and solvent technology, applied in the field of high-efficiency desulfurization ether and thiophene solvent, can solve the problem that the desulfurization solvent cannot meet the requirements, etc., and achieve the effects of low regeneration energy consumption, high economic benefit, and good removal effect.

Pending Publication Date: 2020-11-13
CHINA PETROLEUM ENG CORP LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The above solvents have a certain effect on the removal of thioethers and thiophenes, but there is still room for improvement in terms of acid gas load, regeneration energy consumption, selective absorption of thioethers and thiophenes, and organic sulfur removal rate, especially with energy shortages. With the aggravation of environmental protection and the continuous improvement of environmental protection requirements, these conventional desulfurization solvents can no longer meet the requirements for the treatment of gases containing high sulfur ethers, thiophenes and other organic sulfur

Method used

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  • Efficient solvent for removing thioether and thiophene and application thereof
  • Efficient solvent for removing thioether and thiophene and application thereof
  • Efficient solvent for removing thioether and thiophene and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] A high-efficiency desulfurization ether and thiophene solvent, including the following components in mass percentage: N-methyldiethanolamine 14%, butylethanolamine (BEA) 5%, piperazine 3%, di-tert-butylaminodiethyl ether (TBDE) 20.38 %, hyoscyamine 7%, 2-hydroxybenzimidazole 35%, 1-(1,4-dioxan-2 base)-N-methylmethylamine 15%, polyether modified silicone oil 0.02%, 2- Aminoimidazolinone 0.6%.

[0053] According to the above proportion relationship, the various components are mixed evenly, and the high-efficiency desulfurization ether and thiophene solvent prepared by the preparation are prepared into a 45wt% solution with water, and filled into an absorption tower of a high-efficiency removal of sulfide and thiophene system. Remove sulfide, thiophene, etc. from the gas.

[0054] The absorption tower is equipped with high-efficiency desulfurization ether and thiophene solvents. The absorbent-rich liquid obtained after absorption is flashed through the flash tower, and th...

Embodiment 2

[0056] A high-efficiency desulfurization ether and thiophene solvent, including the following components in mass percentage: 14% of N-methyldiethanolamine, 7% of diethanolamine (DEA), 2% of piperazine, and 15% of di-tert-butylaminodiethyl ether (TBDE) , hyoscyamine 7.88%, 2-(2-methoxyanilino)-methyl-1,3 tetrahydrothiazole 33%, 6-amino-1,4-benzodioxane 21%, polyether modified 0.03% silicone oil, 0.9% boric acid corrosion inhibitor. The high-efficiency desulfurization ether and thiophene solvent prepared above in proportion is prepared into a 50wt% solution with water, and loaded into an absorption tower of a high-efficiency desulfurization ether and thiophene system for removal of sulfide and thiophene from raw material gas.

[0057] The absorbent-rich liquid obtained after absorption is flashed through the flash tower, and the obtained semi-lean liquid enters the lean-rich liquid heat exchanger for heat exchange and then enters the regeneration tower for regeneration. The rege...

Embodiment 3

[0059] A high-efficiency desulfurization ether and thiophene solvent, including the following components in mass percentage: N-methyldiethanolamine 23%, butylethanolamine (BEA) 2%, piperazine 1.5%, di-tert-butylaminodiethyl ether (TBDE) 5.34 %, hyoscyamine 12%, 2-hydroxybenzoimidazole 20%, 6-amino-1,4-phenylpropanedioxane 35%, methyl silicone oil 0.06%, 2-amino imidazolinone 1.1%. Prepare the high-efficiency desulfurization ether and thiophene solvent prepared above in proportion to a 55wt% solution with water, and fill it into an absorption tower of a high-efficiency removal of sulfide and thiophene system for the removal of sulfide and thiophene from raw gas .

[0060] The absorbent-rich liquid obtained after absorption is flashed through the flash tower, and the obtained semi-lean liquid enters the lean-rich liquid heat exchanger for heat exchange and then enters the regeneration tower for regeneration. The regeneration temperature is 121°C and the regeneration pressure is ...

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Abstract

The invention relates to a technology for removing thioether and thiophene from natural gas mixed gas, in particular to an efficient solvent for removing thioether and thiophene and application thereof. The solvent comprises 10%-30% of an activated MDEA solvent, 15%-35% of composite amine, 35%-50% of a heterocyclic amine strong removing agent, 0.01%-0.15% of a defoaming agent and 0.5%-2% of a corrosion inhibitor. The heterocyclic amine strong removing agent contains amine, hydroxyl, ether bonds and other functional groups with an extremely strong removing performance on thioether and thiophene. The activated MDEA solvent and composite amine are used in cooperation in the solvent, so that the removal effect of the solvent on thioether and thiophene in the mixed gas reaches 98% or above, andother organic sulfide and acid gas components can be greatly removed on the premise that the removal effect of thioether and thiophene is guaranteed. The solvent is wide in application range, and hasthe advantages of large acid gas load, low sulfur content in purified gas, stable solvent performance, recyclability, no corrosion to equipment and the like.

Description

technical field [0001] The invention relates to a technology for removing sulfide and thiophene from natural gas mixed gas, in particular to a high-efficiency desulfurization ether and thiophene solvent and its application. Background technique [0002] Mixed gases mainly include natural gas, petroleum refinery gas, synthesis gas, liquefied petroleum gas, etc. Industrial gases such as natural gas, petroleum refinery gas, synthetic gas, and liquefied petroleum gas usually contain impurities such as sulfides, thiophenes, and other organic sulfides. Other organic sulfides mainly include carbonyl sulfide, carbon disulfide, and mercaptans. Sulfide is flammable, volatile, highly toxic, insoluble in water, soluble in ethanol, ether, etc., decomposed by high heat to produce toxic sulfide fumes, and can react strongly with oxidants. Thiophene is a heterocyclic compound and a sulfide. Thiophene naturally occurs in natural gas, and its content can be as high as several percent. Orga...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L3/10
CPCC10L3/103C10L2290/541
Inventor 汤国军梁宇成刘棋韩敏赵启龙康洛铭兰林曹文浩祁亚玲李萍马艳琳赵海龙李超群
Owner CHINA PETROLEUM ENG CORP LTD
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