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Desulfurization refining method of mixed liquefied petroleum gas

A liquefied petroleum gas and refining method technology, applied in the refining field of hydrocarbon materials, can solve the problems of difficulty in obtaining deep desulfurization effect, unfavorable separation of hydrocarbon phase and alkali phase, unfavorable and other problems, and achieve reduced operating costs, convenient operation, and effective significant effect

Active Publication Date: 2017-09-26
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This is disadvantageous for refineries with no or insufficient hydrogen sources
Moreover, naphtha, gasoline, light diesel oil, etc. usually contain a certain amount of aromatics, and sometimes even have a high content of aromatics. When used as a back extraction solvent, it is easy to produce a certain emulsification phenomenon with the lye in contact, which is not conducive to the integration of hydrocarbon phase and Separation of alkali phase, which in turn affects the effect of alkali extraction desulfurization of liquefied petroleum gas
[0008] Based on the existing literature, it can be seen that when the hydrocarbon material to be refined contains a high content of sulfides or contains a large proportion of non-mercaptan sulfides (these non-mercaptan sulfides are difficult to be In the case of liquid extraction), it is usually difficult to obtain the effect of deep desulfurization by conventional lye extraction technology

Method used

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  • Desulfurization refining method of mixed liquefied petroleum gas
  • Desulfurization refining method of mixed liquefied petroleum gas
  • Desulfurization refining method of mixed liquefied petroleum gas

Examples

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Effect test

Embodiment 1

[0028] A refinery produces coking liquefied petroleum gas from the coking unit, and the sulfur content is reduced to about 3000mg / m after treatment with alcohol amine 3 , and then the sulfur content was reduced to 200mg / m3 after lye extraction 3 ~300mg / m 3 about.

[0029] The refinery produces catalytic liquefied petroleum gas from the catalytic cracking unit, which is treated with alcoholamines to reduce the sulfur content to about 200mg / m 3 , and then the sulfur content was reduced to 5mg / m3 after lye extraction 3 .

[0030] According to the present invention, the coked liquefied petroleum gas produced in the coking unit is connected to the riser reactor of the catalytic cracking unit through a pipeline, and injected through a nozzle, and the coked liquefied petroleum gas and the catalytic cracking raw material are cracked together in the riser. Subsequently, the mixed liquefied petroleum gas is distilled from the fractionation system of the catalytic cracking unit, and ...

Embodiment 2

[0034] This example is used to illustrate the effect of using liquefied petroleum gas after alkali extraction and desulfurization as a back extraction solvent for removing disulfides in alkali liquor.

[0035] In this embodiment, sodium hydroxide solution is used as the lye of the liquefied petroleum gas alkali extraction unit, and its mass fraction is 20%, and 200 μg / g~500 μg / g of sulfonated cobalt phthalocyanine (commercially available) is dissolved in the lye Sold product), as an oxidation catalyst to oxidize and regenerate the lye that has absorbed mercaptan.

[0036] The operation steps of extraction and desulfurization refining are as follows:

[0037] The sodium hydroxide lye is contacted with the liquefied petroleum gas after removing hydrogen sulfide through the alcohol amine solution (40% MDEA solution) in the extraction system, the mercaptan in the liquefied petroleum gas is transferred into the lye, and the liquefied petroleum gas after desulfurization The gas is ...

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Abstract

The invention provides a refining method of mixed liquefied petroleum gas. The refining method comprises the following steps: feeding coked liquefied petroleum gas from a coking device into a riser reactor of a catalytic cracking device, and carrying out cracking reaction on the coked liquefied petroleum gas and a catalytic cracking fed material together; then distilling off mixed liquefied petroleum gas mixed with catalyzed liquefied petroleum gas from a fractionation system in the catalytic cracking device; and feeding the mixed liquefied petroleum gas into a hydrogen sulfide extraction device and a mercaptan extraction device to desorb hydrogen sulfide and mercaptan respectively. The sulfur content of the desulfurized liquefied petroleum gas product is not greater than 10 mu g / g. The refined mixed liquefied petroleum gas can be distilled to obtain a propylene product which meets the requirement of the sulfur content, and the propylene product can be used as a raw material for producing low-sulfur MTBE.

Description

technical field [0001] The invention belongs to the refining field of hydrocarbon materials. Background technique [0002] Liquefied petroleum gas (liquefied petroleum gas, LPG) is an important petroleum refining product. In the refinery, it mainly includes catalytic liquefied petroleum gas from catalytic cracking unit and coking liquefied petroleum gas from coking unit, and is mainly composed of carbon three A mixture of hydrocarbons and C4 hydrocarbons. The use of liquefied petroleum gas includes being used as domestic or vehicle fuel, and as a chemical raw material, such as the raw material for extracting commercial propylene and synthetic gasoline antiknock agent methyl tert-butyl ether (MTBE). Liquefied petroleum gas usually needs to be desulfurized and refined before it can be used as the target product. [0003] Unrefined liquefied petroleum gas contains harmful sulfides, the sulfides are mainly hydrogen sulfide and mercaptans, and the mercaptans are mainly methyl m...

Claims

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Application Information

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IPC IPC(8): C10L3/12C10G70/00C10G70/04C10G11/00C10G70/06
CPCC10G11/00C10G70/00C10G70/048C10G70/06C10G2300/202C10G2300/207C10G2400/26C10L3/12
Inventor 潘光成赵杰李涛赵丽萍常春艳吴明清陶志平
Owner CHINA PETROLEUM & CHEM CORP
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