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Recovery method for styrene from pyrolysis gasoline

A technology of pyrolysis gasoline and recovery method, which is applied in the field of recovery of styrene in pyrolysis gasoline, can solve the problems of low recovery rate, low chroma, high sulfur content, etc., and achieve the effect of improving chroma and increasing recovery rate

Active Publication Date: 2008-02-13
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The technical problem to be solved by this invention is existing in the prior art from containing styrene pyrolysis gasoline C 8 When recovering styrene from the distillate, the product has high sulfur content, low chroma and low recovery rate when the product reaches a high purity. Provide a new recovery method for styrene in pyrolysis gasoline

Method used

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  • Recovery method for styrene from pyrolysis gasoline

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Adopt the flow process shown in accompanying drawing 1, the cracking gasoline raw material is composed of C5~C9, and C is separated through two separation towers. 7- components and C 9+ After the components, its weight percent composition is: dicyclopentadiene 3.02%, benzene 0.95%, toluene 1.27%, ethylbenzene 13.16%, p-xylene 9.62%, m-xylene 24.39%, o-xylene 13.07%, styrene 32.43%, phenylacetylene 0.96%, and the rest are non-aromatics.

[0026] The main C after the separation of the two towers 8 The distillate enters the fixed-bed catalytic hydrogenation reactor, and the catalyst is supported Al 2 o 3 Catalyst, in Al 2 o 3 0.3% by weight of palladium was loaded on the carrier. The composition by weight after hydrogenation is: dicyclopentadiene 3.02%, benzene 0.95%, toluene 1.27%, ethylbenzene 13.32%, p-xylene 9.62%, m-xylene 24.39%, o-xylene 13.07%, styrene 33.23% , and the rest are non-aromatics.

[0027] The stream after hydrogenation is separated through an e...

Embodiment 2

[0031] Keep the other operations of the embodiment [1] unchanged, change the weight ratio of the solvent and the raw material in the extractive distillation tower in the process, increase the value to 10: 1, and move the solvent feed position to the 15th theoretical plate, the catalyst is Alumina loaded with 15% by weight nickel. The hydrogenation stream is separated through the extractive distillation tower, and other conditions remain unchanged, the weight percentage of the material discharged from the tower kettle is composed of: 3.22% styrene, 0.29% dicyclopentadiene, and 96.5% solvent. After being separated by the crude styrene tower, the weight percentage of crude styrene obtained is: styrene 91.84%, dicyclopentadiene 8.16%. And then through a styrene refining tower to obtain refined styrene with a purity of 99.96%.

Embodiment 3

[0033] Keep the other operations of the embodiment [1] unchanged, change the operating conditions of the extractive distillation tower in the process, and change the weight reflux ratio of the tower to 0.8. Obtaining the weight percent composition of the discharged material from the tower kettle is the same as in Example [1].

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Abstract

The present invention discloses a method for reclaiming cinnamene from a residue gasoline; the method is to solve the technical problem in the prior technical scheme that: when reclaiming cinnamene from the residue gasoline C8 fraction including cinnamene, the sulfur content is not high; the chroma is lower and the reclaim ratio if the product reaches high purity is lower. The steps in the present invention include: a) the residue gasoline including cinnamene is under the function of adding hydrogenation catalyzer, the material wipes off alkene and alkyne to produce the material flow I; b) the material flow I is taken with liquid phase oxidation by H2O2 to wipe off the sulfuration in the residue gasoline; the total content of the sulfuration in the residue gasoline is less than 5ppm to obtain the material flow II; c) the material flow II is separated by the common separated method to obtain cinnamene; the method can solve the problem greatly, which can be uses in the industrial production of cinnamene from residue gasoline.

Description

technical field [0001] The invention relates to a method for recovering styrene in pyrolysis gasoline. Background technique [0002] In the ethylene cracking unit using naphtha as raw material, the content of xylene is 0.06-0.07 tons / ton of ethylene, while pyrolysis gasoline C 8 The ratio of xylene:styrene:ethylbenzene in the distillate is usually 4:3:1. According to this calculation, a set of 600,000 tons / year ethylene plant can recover about 29,000 tons / year of styrene. If the ethylbenzene is dehydrogenated and recovered, the output of styrene can be increased, which has a certain recovery value. The recovery of styrene from pyrolysis gasoline can eliminate the hydrogen consumption of styrene hydrogenation in traditional pyrolysis gasoline units, thereby reducing the load on hydrogenation units; the ethylbenzene content in recovered mixed xylene is greatly reduced, which can be used as xylene isomerization Raw material for the production of p-xylene; a considerable amoun...

Claims

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Application Information

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IPC IPC(8): C07C15/46C07C7/00C07C7/148
Inventor 肖剑张惠明钟禄平陈秀宏
Owner CHINA PETROLEUM & CHEM CORP
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