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Decolorization method for recycling vinyl benzene with pyrolysis gasoline

A technology for pyrolysis of gasoline and styrene, applied in the fields of organic chemistry, distillation purification/separation, etc., which can solve the problems of high equipment requirements, complex solid waste and process, and complicated process.

Active Publication Date: 2009-05-13
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is a large amount of solid waste and complex process brought by bleaching clay decolorization in the prior art, or the problems of high equipment requirements and complicated process for nitric acid decolorization, and a new method for recovering benzene from pyrolysis gasoline is provided. A decolorization method for ethylene, which has the characteristics of simple process and no pollution

Method used

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  • Decolorization method for recycling vinyl benzene with pyrolysis gasoline

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Experimental program
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Effect test

Embodiment 1

[0014] Crude styrene enters the refined styrene column with 10 theoretical plates at 10 g / min, the feeding position is the fifth theoretical plate, the reflux ratio is 5, the operating pressure is 12KPa, and the temperature at the top of the tower is controlled at 79-79.5°C. After the pure styrene vapor at the top of the tower is condensed by the condenser, the flow rate of the extracted pure styrene is 8 g / min, the chromaticity of pure styrene is 10 in terms of platinum cobalt chromaticity unit, and the remaining styrene flows in at 40 g / min In the reflux tank, the decolorizing agent maleic acid enters the reflux tank at 0.05 g / min. After the two are mixed and dissolved, they enter the top of the purified styrene tower, and the heavy components obtained in the tower reactor are extracted at 2 g / min.

Embodiment 2

[0016] Crude styrene enters the purified styrene tower with 50 theoretical plates at 10 g / min, the feeding position is the 25th theoretical plate, the operating pressure is 10KPa, the reflux ratio is 1, and the temperature at the top of the tower is controlled at 75-75.5°C. After the pure styrene vapor at the top of the tower is condensed by the condenser, the flow rate of the extracted pure styrene is 8 g / min, the chromaticity of pure styrene is 5 in terms of platinum cobalt chromaticity unit, and the remaining styrene flows in at 8 g / min The reflux tank, the decolorizing agent oxalic acid enters the reflux tank at 0.5 g / min, the two are mixed and dissolved and enter the top of the purified styrene tower, and the heavy components of the tower reactor are extracted at 2 g / min.

Embodiment 3

[0018] Crude styrene enters the purified styrene tower with 30 theoretical plates at 10 g / min, the 15th theoretical plate is fed into the position, the operating pressure is 8KPa, the reflux ratio is 2, and the temperature at the top of the tower is controlled at 69-69.5°C. After the top pure styrene vapor is condensed by the condenser, the flow rate of pure styrene is 8 g / min, the chromaticity of pure styrene is 5 in platinum cobalt chromaticity unit, and the remaining styrene flows into reflux at 16 g / min tank, the decolorizing agent maleic anhydride enters the reflux tank at 0.05 g / min, the two are mixed and dissolved and enter the top of the refined styrene tower, and the heavy components in the tower reactor are extracted at 2 g / min.

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Abstract

The invention relates to a decoloring method for reclaiming styrene from pyrolysis gasoline, which mainly solves the problems of a large quantity of solid waste and complex technology caused by adoption of gumbrine for decolorization or high equipment requirement and complex flow caused by adoption of a nitric acid for decolorization. The decoloring method is as follows: coarse styrene enters into the middle of a refined styrene tower, and pure styrene vapor is obtained on the top of the tower; after the pure styrene vapor is condensed by a condenser, one part is extracted to prepare pure styrene the chrominance of which is less than or equal to 10 as calculated by the platinum-cobalt chrominance unit, and the other part of the pure styrene vapor enters into a return tank, mixed and dissolved with a decoloring agent, and enters into the top of the tower for reflux, and heavy constituents are obtained at the bottom of the tower, wherein the decoloring agent is selected from at least one of an organic acid or organic anhydride. The technical proposal well solves the problems, and the decoloring method can be used in industrial production for reclaiming the styrene from the pyrolysis gasoline.

Description

technical field [0001] The invention relates to a decolorization method for recovering styrene from 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, and the ratio of xylene:styrene:ethylbenzene in the C8 fraction of pyrolysis gasoline 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 co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C15/46C07C7/04
Inventor 钟禄平肖剑陈秀宏郭艳姿张惠明
Owner CHINA PETROLEUM & CHEM CORP
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