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Method for removing mercaptan in liquefied petroleum gas through catalysis

A liquefied petroleum gas and catalytic desulfurization technology, which is applied in the petroleum industry, gas fuel, fuel, etc., can solve the problems of thioetherification catalyst and no involvement, and achieve good economic and social benefits, low reaction temperature, high sulfur The effect of alcohol removal rate

Active Publication Date: 2014-08-06
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the patent does not involve more information about thioetherification catalysts
[0014] The above-mentioned patents are all aimed at the conversion of mercaptans in liquid petroleum hydrocarbon fractions, and do not involve the removal of mercaptan sulfur-containing compounds in liquefied petroleum gas. The above-mentioned patents do not involve the thioetherification of methyl mercaptan in liquefied petroleum gas React implementation example

Method used

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  • Method for removing mercaptan in liquefied petroleum gas through catalysis

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Embodiment 1

[0037] This embodiment provides a method for catalytic demercaptanization of liquefied petroleum gas, its technological process is as follows figure 1 As shown, the raw material of the liquefied petroleum gas is the liquefied petroleum gas after hydrogen sulfide removal and carbonyl sulfide treatment, and its composition is shown in Table 1.

[0038] Table 1

[0039] composition

content

Propane, %(v / v)

9.3

Propylene, %(v / v)

31.46

n-butane, %(v / v)

5.66

Isobutane, %(v / v)

25.07

1-Butene, %(v / v)

6.57

Isobutylene, %(v / v)

8.71

Cis-2-butene, %(v / v)

5.36

Trans-2-butene, %(v / v)

7.83

1,3-Butadiene, %(v / v)

0.03

Methyl mercaptan, μg / g

276.6

Hydrogen sulfide, μg / g

7.4

[0040] The method for catalytic sweetening of liquefied petroleum gas provided in this embodiment comprises the following steps:

[0041] The liquefied petroleum gas raw material ente...

Embodiment 2

[0051] This embodiment provides a method for catalytic demercaptanization of liquefied petroleum gas. Its operation steps are basically the same as in Embodiment 1. The liquefied petroleum gas mixture is carried out the distilling tower operation condition of fractionation treatment is identical with embodiment 1, and thioetherification catalyst still adopts Ni-Mo / SiO 2 -Al 2 o 3 system catalysts, the difference lies in the content of transition metals in the catalysts. Ni-Mo / SiO used in this example 2 -Al 2 o 3 In the system catalyst, based on the total weight of the catalyst, the composition content of the catalyst is: NiO 12.5wt%, MoO 3 8.5wt%, SiO 2 -Al 2 o 3 (including Al 2 o 3 87wt%, SiO 2 13wt%) 79wt%.

[0052] From figure 2 It can be seen from the figure that after the reaction lasted for 100 hours, the content of methyl mercaptan in the liquefied petroleum gas product after demercaptan removal at the top of the distillation column was measured to be 5.0 μg...

Embodiment 3

[0054] This embodiment provides a method for catalytic demercaptanization of liquefied petroleum gas, the operation steps of which are basically the same as in embodiment 1, and the loading amount of the catalyst used is the same as that of embodiment 1, the difference is that the composition of the liquefied petroleum gas raw material and the formazan The content of mercaptan sulfur is different, and the raw material composition is shown in Table 2; the thioetherification catalyst is Ni-W / SiO 2 -Al 2 o 3 System catalyst, the compound of transition metal nickel and tungsten is loaded on the carrier by the step-by-step impregnation method, based on the total weight of the catalyst, the composition content of the catalyst is: NiO 12wt%, WO 3 8wt%, SiO 2 -Al 2 o 3 Composite oxides (containing Al 2 o 3 87wt%, SiO 2 13wt%) 80wt%; the reaction temperature is 80°C, the reaction pressure is 2.0MPa, and the liquid volume space velocity is 2.5h -1 , the volume ratio of hydrogen...

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Abstract

The invention relates to a method for removing mercaptan in liquefied petroleum gas through catalysis. The method comprises the following steps: mixing liquefied petroleum gas with hydrogen, allowing an obtained mixture to enter a fixed bed reactor and contact with a catalyst in the fixed bed reactor for thiolation and allowing mercaptan in the liquefied petroleum gas to react with active unsaturated hydrocarbon in the liquefied petroleum gas under the action of the catalyst so as to produce a high-boiling point thioether compound, wherein a part of dialkene is selectively saturated and monoolefine is not saturated, so a liquefied petroleum gas mixture is obtained; and allowing the reacted liquefied petroleum gas mixture to enter a distillation column for distillation and separating a liquid petroleum gas fraction from the high-boiling point thioether compound so as to obtain a liquefied petroleum gas product without mercaptan. The method provided by the invention employs the catalytic reaction between raw materials to remove mercaptan without introduction of an auxiliary agent for participation in the reaction, has a high mercaptan removal rate and no discharge of alkaline residue and simplifies conventional process for removal of mercaptan in liquefied petroleum gas.

Description

technical field [0001] The invention relates to a method for catalytic desulfurization of liquefied petroleum gas and a reactive distillation system, belonging to the technical field of desulfurization and purification of liquefied petroleum gas. Background technique [0002] Liquefied petroleum gas is one of the important petroleum processing products. It can be used as an efficient clean fuel, and can be separated to obtain propylene and C4 fractions, which can be used as raw materials for olefin polymerization, etherification and alkylation. However, liquefied petroleum gas contains high concentrations of sulfides such as hydrogen sulfide and mercaptans. These sulfides have adverse effects on the subsequent processing and utilization of liquefied petroleum gas and environmental protection. Therefore, it is very necessary to desulfurize liquefied petroleum gas. . [0003] The sulfides contained in liquefied petroleum gas are mainly hydrogen sulfide, carbonyl sulfide and m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L3/12
Inventor 鲍晓军黄德奇柯明石冈范煜王磊
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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