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Method for increasing yields of low-carbon olefins and aromatics by coker gasoline steam cracking

A technology for coking gasoline and aromatics, applied in chemical instruments and methods, hydrocarbon cracking to produce hydrocarbons, purification/separation of hydrocarbons, etc., can solve the problems of high energy consumption, extend the coke cleaning cycle, reduce the coking rate and improve selectivity Effect

Active Publication Date: 2014-03-26
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Hydrogenation reaction and conventional solvent extraction are commonly used methods to remove olefins and aromatics in oil products respectively, but these two traditional processes have common problems and high energy consumption

Method used

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  • Method for increasing yields of low-carbon olefins and aromatics by coker gasoline steam cracking
  • Method for increasing yields of low-carbon olefins and aromatics by coker gasoline steam cracking
  • Method for increasing yields of low-carbon olefins and aromatics by coker gasoline steam cracking

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A kind of coker gasoline is used as raw material, and its raw material properties are shown in Table 1. Send it to the experimental device for extracting aromatics with ionic liquid solvent. The extraction device is a rotating disk extraction tower with 50 actual trays and countercurrent operation. The ionic liquid solvent is methylbutylpyridine tetrafluoroborate [mebupy] [BF 4 ], the mol ratio of solvent to raw oil is 2.5, the extraction tower operates under normal pressure, and the extraction temperature is 55°C; the rich solvent flowing out from the bottom of the extraction tower is stripped by nitrogen to recover the solvent. The raffinate at the top of the tower is passed through activated carbon to absorb the solvent to obtain an aromatics-poor stream. The aromatics content of the aromatic-lean stream was 3.24w%, the sulfur content dropped to 1056 μg / g, and the nitrogen content dropped to 10.30 μg / g; the aromatics content of the crude aromatics stream was 78.33w...

Embodiment 2

[0041] The aromatic-poor stream obtained in Example 1 was sent to an experimental device for extracting olefins with an ionic liquid solvent. The extraction device is a rotating disk extraction tower with 50 actual trays and countercurrent operation. The ionic liquid solvent is 1-butyl-3-methylimidazolium tetrafluoroborate [BMIM][BF 4 ], and added 19mol% of AgBF 4 , the molar ratio of solvent to raw oil is 3, the extraction tower operates under normal pressure, and the extraction temperature is 45°C; the rich solvent flowing out from the bottom of the extraction tower is stripped by nitrogen to recover the solvent. The raffinate at the top of the tower is passed through the activated carbon to absorb the solvent to obtain an olefin-depleted stream. The olefin content of the olefin-lean stream is 3.23wt%, the aromatics content is 0.42wt%, the sulfur content is reduced to 381μg / g, and the nitrogen content is reduced to 2.01μg / g; the olefin content of the crude olefin stream is...

Embodiment 3

[0046] The olefin-lean stream obtained in Example 2 is heated to 60°C and mixed with water vapor heated to 180°C at a dilution ratio of 0.5, and then introduced into the tube furnace hydrocarbon thermal cracking reactor, and the operating temperature is 835°C. The cleavage reaction was carried out under the condition of 0.247s, and the C-rich 2 Alkenes, C 3 Alkenes and C 4 Products of olefins, cracked fuel oils and C 6 ~C 9 The hydrocarbon mixture of aromatics, the yield of the main product of cracking is shown in Table 4; 6 ~C 9 After hydrogenation, the hydrocarbon mixture of aromatics is mixed with the crude aromatics stream to enter the aromatics separation process to obtain aromatics products such as benzene, toluene, and xylene. The total yield of aromatics is shown in Table 5.

[0047] Table 4: Cleavage yields of major cleavage products

[0048]

[0049] Table 5: Total Aromatics Yield

[0050]

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Abstract

The invention relates to a method for increasing yields of low-carbon olefins and aromatics by coker gasoline steam cracking, which comprises the following steps: aromatic extraction by an ionic liquid solvent and olefin extraction by an ionic liquid solvent are respectively performed to pretreat raw oil so as to remove aromatics and olefins, thereby obtaining a hydrocarbon stream in which the aromatic content is lower than 2 wt% and the olefin content is lower than 4 wt%; the hydrocarbon stream enters a steam cracking procedure to be subjected to cracking and separation; the crude aromatic stream is sent into a hydrocracking gasoline aromatic extraction unit to separate the aromatic product; and the obtained stream containing rich saturated hydrocarbons is returned and introduced into the cracking procedure together with a petroleum hydrocarbon stream containing less aromatics to react and produce the low-carbon olefins. The method provides a proper application way for coker gasoline, widens the cracking raw material sources, recycles the non-aromatic components by using the original cracking hydrogasoline aromatic extraction system, and increases the yields of the low-carbon olefins and aromatics in the cracking process.

Description

technical field [0001] The present invention relates to a method for increasing the production of low-carbon olefins and aromatics, more specifically, the present invention relates to a kind of coked gasoline which is extracted by adding ionic liquid to remove the aromatics and olefins therein, desulfurize and denitrogenate, and then carry out steam cracking to improve low-carbon Methods for olefin and aromatic yields. technical background [0002] Low-carbon olefins such as ethylene and propylene are the basic raw materials for chemical production, and steam cracking equipment is the leader of petrochemical industry, which has a major impact on the economic benefits of enterprises. The current steam cracking raw materials are mainly four kinds of naphtha, hydrogenated tail oil, light hydrocarbon and diesel oil. In recent years, with the continuous increase of ethylene production capacity and the increasing shortage of crude oil resources, the contradiction between the supp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G55/04C07C15/04C07C15/06C07C15/08C07C11/16C07C11/04C07C11/06C07C4/04C07C7/163
CPCC10G21/27
Inventor 郭莹杜志国杨晓红刘同举田勇王国清
Owner CHINA PETROLEUM & CHEM CORP
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