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Method for simultaneously removing hydrogen sulfide and mercaptan by iron based ionic liquid

An iron-based ionic liquid and ionic liquid technology, applied in chemical instruments and methods, separation methods, dispersed particle separation, etc., can solve problems such as expensive chelating agents, poor quality of sulfur products, and intensified side reactions, so as to reduce equipment costs Expenditure, reduction of operating costs, and the effect of avoiding churn

Inactive Publication Date: 2017-12-29
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The common feature of the traditional wet redox desulfurization process is that it is carried out in aqueous solution. When it is under alkaline conditions, there are chelating agents that are expensive and easy to degrade. When the sulfur capacity is high, the side reactions are intensified and the product sulfur quality is low. Bad question

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Example 1 using [bmim]FeCl 4 and [bmim] 3 PMo 12 o 40 solution to remove hydrogen sulfide

[0025] [bmim] 3 PMo 12 o 40 and [bmim]FeCl 4 Prepare 100 mL of desulfurization solution at a volume ratio of 1 / 9. Mixed gas composition H 2 S is 10.5 g / Nm 3 , and the rest are N 2 , into the desulfurization solution at a flow rate of 30 ml / min, the reaction temperature is 40°C, and the conversion rate of sulfur is 99.3% after 4 hours. Pass air into the desulfurization solution for regeneration for 2 hours, and the heating temperature is 80°C. When the mixed gas is fed again under the same conditions above, the conversion rate of sulfur is 99.1%, and the desulfurization performance of the solution is not reduced after 4 cycles.

Embodiment 2

[0026] Example 2 using [bmim]FeCl 4 and [bmim] 3 PMo 12 o 40 solution to remove methyl mercaptan

[0027] [bmim] 3 PMo 12 o 40 and [bmim]FeCl 4 Prepare 100 mL of desulfurization solution at a volume ratio of 1 / 9. The mixed gas component methyl mercaptan is 530 mg / Nm 3 , and the rest are N 2 . Pass it into the solution at a flow rate of 30 ml / min, the reaction temperature is 40°C, and the desulfurization efficiency is 96.1% after 4 hours. The previous solution was regenerated by air for 2 hours, and the heating temperature was 80°C. When the mixed gas is fed again under the same conditions above, the desulfurization efficiency is 95.8%, and the desulfurization performance of the solution does not decrease after 4 cycles.

Embodiment 3

[0028] Example 3 using [bmim]FeCl 4 and [bmim] 3 PMo 12 o 40 The solution simultaneously removes hydrogen sulfide and methyl mercaptan

[0029] [bmim] 3 PW 12 o 40 and [bmim]FeCl 4 Prepare 100 mL of desulfurization solution at a volume ratio of 1 / 9. H in the gas mixture 2 S (12.6 g / Nm 3 ), methyl mercaptan (610 mg / Nm 3 ), and the rest are N 2 . It was passed into the solution at a flow rate of 30 ml / min, and the reaction temperature was 40°C. After 4 hours, the conversion rate of sulfur was 97.8%, and the removal rate of methyl mercaptan was 95.2%. Then, the previous solution was regenerated by air for 2 hours, and the heating temperature was 80°C. When the mixed gas was fed again under the same conditions above, the conversion rate of sulfur was 97.7%, and the removal rate of methyl mercaptan reached 95.5%, and the desulfurization efficiency of the solution did not decrease after four cycles.

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PUM

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Abstract

The invention belongs to the technical field of gas purification, and relates to a method for simultaneously removing hydrogen sulfide and mercaptan by an iron based ionic liquid. A desulphurizing liquid mainly contains the iron based ionic liquid and a heteropoly acid ionic liquid, and is not mutually soluble with water. With use of the iron based ionic liquid in acidic conditions and the presence of the heteropoly acid ionic liquid with redox properties, hydrogen sulfide and mercaptan can be advantageously oxidized into elemental sulfur and corresponding sulfides. At the same time, trivalent iron ions in the iron based ionic liquid are reduced after hydrogen sulfide and mercaptan are oxidized, and are regenerated and recycled after acting with air. The method can make the purification process of a gas mixture containing hydrogen sulfide and mercaptan integrated and simplified, has the advantages of high absorption efficiency, easy regeneration, no adverse reaction, easy recovery of products and the like, and can be used for treating to simultaneously remove hydrogen sulfide and mercaptan in oilfield associated gas, natural gas and refinery gas.

Description

technical field [0001] The invention belongs to the technical field of gas purification, and relates to a method for simultaneously removing hydrogen sulfide and mercaptan by an iron-based ionic liquid. Background technique [0002] Hydrogen sulfide and mercaptans are the most common sulfur compounds in industrial gases such as natural gas, synthesis gas, and refinery gas. Hydrogen sulfide and mercaptans are harmful to the human body. Both of them can stimulate the human central nervous system. When the concentration is low, they will cause symptoms such as headache and nausea. When the concentration is high, they will even cause respiratory system death. The sulfur atoms in hydrogen sulfide and mercaptans will combine with the metal atoms in the catalyst, causing the deactivation of the catalyst. Hydrogen sulfide and mercaptans have weak acidity and strong reactivity, which can cause corrosion and accelerated corrosion to metals under certain conditions, and mercaptans can...

Claims

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Application Information

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IPC IPC(8): B01D53/48B01D53/52B01D53/78B01D53/86B01D53/96
CPCB01D53/78B01D53/8603B01D53/8612B01D53/96
Inventor 杨建平朱燕俞健健冯亚平
Owner CHINA PETROLEUM & CHEM CORP
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