A method for increasing production of low-carbon olefins and aromatics by steam cracking of coker gasoline

A technology for coking gasoline and low-carbon olefins, which is applied in chemical instruments and methods, hydrocarbon cracking to produce hydrocarbons, and purification/separation of hydrocarbons. Yield effect

Active Publication Date: 2015-08-19
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 respectively, but these two traditional processes have common problems, such as high energy consumption, and the hydrogenation process also needs sufficient Hydrogen source

Method used

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  • A method for increasing production of low-carbon olefins and aromatics by steam cracking of coker gasoline
  • A method for increasing production of low-carbon olefins and aromatics by steam cracking of coker gasoline
  • A method for increasing production of low-carbon olefins and aromatics by steam cracking of coker gasoline

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A kind of coker gasoline is used as raw material, and its raw material properties are shown in Table 1. Send to the ionic liquid solvent extraction experimental device. 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 15mol% of AgBF 4 , the molar ratio of solvent to raw oil is 6.5, the extraction tower operates under normal pressure, and the extraction temperature is 40°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 aromatics-lean stream was 0.91 wt%, the olefins content was 4.17 wt%, the sulfur content was reduced to 634 μg / g, and the nitrogen content was reduced to 4.12 μg / g; the ...

Embodiment 2

[0038] The aromatic-poor stream obtained in Example 1 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 tubular furnace hydrocarbon thermal cracking reactor. The operating temperature is 835°C, and the residence time is The cleavage reaction was carried out under the condition of 0.247s to obtain rich C 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 3.

[0039] Table 3: The cleavage yield of the main cleavage products

[0040]

Embodiment 3

[0042] The aromatic-rich stream obtained in Example 1 was subjected to hydrogenation reaction. It is carried out in two hydrogenation reactors, the first is a diene hydrogenation reactor and the second is a monoene hydrogenation reactor. In the diene hydrogenation reactor, diene is hydrogenated to generate monoolefins, the catalyst is LY-9801 (Pd-based catalyst, Pd content is 0.3wt%) the reactor inlet temperature is 60°C, the reaction pressure is 2.6Mpa, hydrogen The oil molar ratio is 0.6, the volume space velocity (fresh oil) is 3h-1, and the circulation ratio is 3.7. In the mono-olefin hydrogenation reactor, the hydrogenation catalyst is LY-9802 (Co-Mo-Ni, carrier Al2O3), the inlet temperature of the reactor is 280°C, the reaction pressure is 5.67Mpa, the molar ratio of hydrogen to oil is 4, and the volume empty The speed is 2.5h-1, and the olefins in the material are hydrogenated into alkanes. The composition of the obtained hydrogenated gasoline is shown in Table 4.

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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: raw oil is subjected to ionic liquid solvent extraction 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 5 wt%; the hydrocarbon stream enters a steam cracking procedure to be subjected to cracking and separation; the crude aromatic stream is sent into a cracked gasoline hydrogenation unit together with cracked gasoline, and the olefins are hydrogenated and sent into a hydrocracked 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 an effective utilization way for the coker gasoline raw material, widens the ethylene 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 method of removing aromatics and olefins in coked gasoline after extraction with ionic liquids, followed by steam cracking to increase the production of low-carbon olefins and aromatics yield methods. 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 raw materials for steam cracking are mainly naphtha, hydrogenated tail oil, light hydrocarbons 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 supply and demand of ethylene raw materials has g...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C15/04C07C15/06C07C11/16C07C11/04C07C11/06C07C4/04C07C7/163
CPCY02P20/54
Inventor 郭莹杜志国刘同举杨晓红田勇王国清
Owner CHINA PETROLEUM & CHEM CORP
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