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Method for Deep Desulfurization of Liquefied Petroleum Gas

A liquefied petroleum gas and deep desulfurization technology, which is applied in the petroleum industry, gas fuel, fuel, etc., can solve the problems of adding more devices, increasing the pressure and consumption of alkaline sewage environmental protection treatment, and achieving the reduction of desulfurization agent consumption, significant economic benefits and Environmental benefits and the effect of improving desulfurization efficiency

Active Publication Date: 2017-06-16
HUBEI HUABANG CHEM +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

That is to say, when the sulfur content in liquefied petroleum gas is reduced to a certain level, no matter how much the price is paid, the sulfur content will no longer be reduced or the improvement will be small, but it will consume doubled resources: more equipment and more additives , consume a large amount of lye and amine solution, and at the same time significantly increase the environmental protection treatment pressure of alkaline sewage

Method used

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  • Method for Deep Desulfurization of Liquefied Petroleum Gas
  • Method for Deep Desulfurization of Liquefied Petroleum Gas
  • Method for Deep Desulfurization of Liquefied Petroleum Gas

Examples

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Effect test

Embodiment 1

[0046] Using the same liquefied petroleum gas raw material in the comparative example, see figure 1 The process schematic diagram shown in Example 1 shows a method for deep desulfurization of liquefied petroleum gas, comprising the following steps: (1) carrying out the dehydrogen sulfide reaction of the liquefied petroleum gas to be treated through the dehydrogen sulfide unit to obtain The liquefied petroleum gas after hydrogen sulfide removal; (2) the liquefied petroleum gas after hydrogen sulfide removal obtained in step (1) is subjected to carbonyl sulfide reaction through the decarbonyl sulfide unit to obtain the liquefied petroleum gas after decarbonylation sulfide (3) carry out gas separation by the liquefied petroleum gas after the decarbonylation described in step (2) obtained through the gas fractionation tower, separate the carbon three cuts from the tower top of the gas fractionation tower, and separate the carbon four cuts at the bottom of the tower; The C3 fractio...

Embodiment 2

[0051] Using the same liquefied petroleum gas raw material in the comparative example, see figure 2 The process flow diagram shown in the present embodiment is a method for deep desulfurization of liquefied petroleum gas, and the method includes the following steps: (1) performing dehydrogen sulfide reaction on the liquefied petroleum gas to be treated through the dehydrogen sulfide unit, Obtain the liquefied petroleum gas after hydrogen sulfide removal; (2) carry out gas separation by the liquefied petroleum gas after the hydrogen sulfide removal described in step (1) through a gas fractionation tower, and separate the carbon three cuts from the top of the gas fractionation tower , separate the carbon four cuts at the bottom of the tower to obtain the carbon three cuts and carbon four cuts after hydrogen sulfide removal; (3) pass the carbon three cuts after the dehydrogenation described in step (2) through the decarbonylation unit Remove carbonyl sulfide to obtain the refine...

Embodiment 3

[0056] Using the same liquefied petroleum gas raw material in the comparative example, see figure 2 The process flow diagram shown in the present embodiment is a method for deep desulfurization of liquefied petroleum gas. The method includes the following steps: (1) performing gas separation on the liquefied petroleum gas to be treated through a gas fractionation tower. The C3 fraction is separated from the top of the tower, and the C4 fraction is separated from the bottom of the tower to obtain the C3 fraction and the C4 fraction; (2) the C3 fraction obtained in step (1) is desulfurized through the dehydrogen sulfide unit Hydrogen reaction to obtain liquefied petroleum gas after hydrogen sulfide removal; (3) decarbonylation of the carbon three cuts obtained in step (2) after dehydrogenation through the decarbonylation unit to obtain decarbonylation sulfide After the refined C3 fraction, collect the refined C3 fraction or directly pass the refined C3 fraction into the follow-...

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Abstract

The invention relates to a method for deep desulfurization of liquefied petroleum gas. The method only simply changes the position of the gas fractionation tower in the existing process, so that the liquefied petroleum gas has undergone carbon three fractions and carbon four fractions before desulfurization and refining are completed. Separation, the entire or part of the desulfurization process is concentrated in the C3 fraction and (or) the C4 fraction, which greatly reduces the processing capacity of liquefied petroleum gas in each (or part) desulfurization unit, thus greatly reducing the load on the device. At the same time, the method overcomes the bottleneck defect of the traditional desulfurization treatment method only aimed at the liquefied petroleum gas itself to improve the desulfurization efficiency. The inventive method can avoid or reduce the generation of disulfides or polysulfides without substantially increasing refinery investment, and provides liquefied petroleum gas without disulfides or polysulfides for the next step lye sweetening process, thereby Significantly improved the final desulfurization efficiency of liquefied petroleum gas.

Description

technical field [0001] The invention belongs to the technical field of petrochemical industry, and specifically relates to a process method for deep desulfurization of liquefied petroleum gas. . Background technique [0002] Liquefied Petroleum Gas (LPG for short), its main component is a mixture of C3 and C4 alkanes and olefins, in my country, LPG mainly comes from catalytic cracking and coking processes. Stable liquefied petroleum gas directly produced from upstream devices such as catalytic cracking or coking processes often contains a variety of sulfides, mainly carbonyl sulfide, hydrogen sulfide, mercaptans, and sulfides. The sulfides in liquefied petroleum gas usually have the highest content of hydrogen sulfide and methyl mercaptan, and the concentration of hydrogen sulfide in coking-stabilized liquefied petroleum gas can be tens of thousands of mg / m 3 (calculated as sulfur), the concentration of methyl mercaptan is usually 3000~10000mg / m 3 (calculated as sulfur), ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10L3/12
Inventor 夏明桂田任飞黄艳刚任家君毛满意杨霄邓国伟李锐吴剑宏董会杰张圣祖彭雄义卢慧娟
Owner HUBEI HUABANG CHEM