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Sweetening agent combination

A technology for desulfurization and composition, which is applied in the field of desulfurizer composition, can solve the problems of frequent replacement of lye, the total sulfur content of liquefied petroleum gas exceeds the standard, and increases the production cost of an oil refinery, and achieves the elimination of potential safety hazards and the simple and convenient process operation. , the effect of reducing the pressure of environmental protection

Active Publication Date: 2011-03-30
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of this process are: the whole process uses a large amount of liquid caustic soda, and the lye is frequently replaced, which leads to a great pressure on environmental protection due to the discharge of waste lye, and the treatment of waste lye also increases the production cost of the refinery; the desulfurization depth of liquefied gas is not high. High, without considering the removal of COS, one of the main pollutants; the disulfide in the oxidation regenerant alkali is difficult to separate, often making the total sulfur content in the liquefied petroleum gas exceed the standard

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042]The raw material contains 12 μg g-1 hydrogen sulfide sulfur, 15 μg g g-1 carbonyl sulfide sulfur and 125 μg g-1 mercaptan sulfur, of which 113 μg g-1 methyl mercaptan sulfur and 12 μg ethanethiol sulfur The liquefied petroleum gas of g-1, processing step comprises: (1) with the monoethanolamine of 15wt% as desulfurizer, add-on is 2wt% of liquefied petroleum gas gross weight, the reaction temperature of carbonyl sulfide hydrolysis reactor is 30 ℃, pressure is 0.8MPa, and the volumetric space velocity passing through the carbonyl sulfide hydrolysis catalyst bed is 6h -1 , the carbonyl sulfide hydrolysis catalyst is MgO / γ-Al 2 o 3 (2) When extracting mercaptan, the mercaptan removal agent composition used is an aqueous solution containing tetramethylammonium hydroxide 10wt% and monoethanolamine 10wt%, and the mercaptan removal agent composition and liquefied petroleum gas volume ratio are 1: 6 , the temperature is 30°C, the pressure is 0.8MPa, after the liquefied petroleu...

Embodiment 2

[0044] The raw material contains 12 μg g-1 hydrogen sulfide sulfur, 15 μg g g-1 carbonyl sulfide sulfur and 125 μg g-1 mercaptan sulfur, of which 113 μg g-1 methyl mercaptan sulfur and 12 μg ethanethiol sulfur The liquefied petroleum gas of g-1, processing step comprises: (1) take the methyldiethanolamine of 25wt% as desulfurizing agent, add-on is 5wt% of liquefied petroleum gas gross weight, the reaction temperature of carbonyl sulfide hydrolysis reactor is 30 ℃ , the pressure is 1.0MPa, and the volumetric space velocity through the carbonyl sulfide hydrolysis catalyst bed is 6h -1 , the carbonyl sulfide hydrolysis catalyst is MgO / (γ-Al 2 o 3 +TiO 2 ); (2) when extracting sulfur removal, the sweetening agent composition used is an aqueous solution containing tetramethylammonium hydroxide 10wt% and diglycolamine 20wt%, and the volume ratio of the sweetening agent composition and liquefied petroleum gas is 1 : 6, the temperature is 30°C, the pressure is 1.0MPa, after the liq...

Embodiment 3

[0046] The raw material contains 12 μg g-1 hydrogen sulfide sulfur, 15 μg g g-1 carbonyl sulfide sulfur and 125 μg g-1 mercaptan sulfur, of which 113 μg g-1 methyl mercaptan sulfur and 12 μg ethanethiol sulfur The liquefied petroleum gas of g-1, processing step comprises: (1) take the diglycolamine of 30wt% as desulfurizing agent, add-on is 2wt% of the total weight of liquefied petroleum gas, the reaction temperature of carbonyl sulfide hydrolysis reactor is 30 ℃ , the pressure is 1.2MPa, and the volume space velocity through the carbonyl sulfide hydrolysis catalyst bed is 6h -1 , the carbonyl sulfide hydrolysis catalyst is BaO / (γ-Al 2 o 3 +TiO 2 ); (2) when extracting and removing mercaptans, the mercaptan removal agent composition used is an aqueous solution containing tetramethylammonium hydroxide 10wt% and methyldiethanolamine 20wt%, and the mercaptan removal agent composition and liquefied petroleum gas volume ratio is 1 : 6, the temperature is 30°C, the pressure is 1....

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Abstract

The invention relates to a sweetening agent combination which comprises 0.1-50wt% of a first component, 0.1-98 wt% of a second component and balance of water, wherein the first component is one or a mixture of quaternary ammonium base and quaternary phosphonium base, and the second component is one or a mixture of monoethanol amine, diethanol amine, methyl diethanol amine, diglycol amine, diisopropanolamine, ethylene diamine, propane diamine, butanediamine, N-formylmorpholine, N-methylpyrrolidone, methanol, ethanol and glycol. The sweetening agent does not contain a sodium hydroxide solution, does not release base slag, and can be regenerated by steam stripping without oxidation. The sweetening agent combination can be used for producing non-corrosive ultra low-sulfur liquefied petroleum gas and light petrol (the boiling point is lower than 80 DEG C), and the total sulfur content of the liquefied petroleum gas and the light petrol can be decreased to 5 mu g.g<-1> or below.

Description

technical field [0001] The invention belongs to the field of petrochemical technology, in particular to a demercaptan agent composition used for removing mercaptans in liquefied petroleum gas and light gasoline (boiling point<80°C). Background technique [0002] With the increase in the processing volume of imported high-sulfur crude oil and the increase in the refining ratio of residual oil, the total sulfur content in liquefied petroleum gas (LPG) produced by catalytic cracking devices in refineries has also increased. LPG usually contains H 2 S, COS, CS 2 , mercaptan, thioether and disulfide and other toxic and harmful components, especially the H 2 S, COS and mercaptans are more harmful. If they are not removed, they will cause great pollution to the environment and have a great impact on the subsequent processing. [0003] The current liquefied gas refining process is mainly as follows: the liquefied gas coming out of the refinery unit first enters the alcohol ami...

Claims

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Application Information

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IPC IPC(8): C10L3/12C10G19/02C10G29/20
Inventor 柯明蒋庆哲宋昭峥史丽娟张振全
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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