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Method for producing 3-Methylstyrene and p-Methylstyrene

A technology of p-methylstyrene and its production method, which is applied in the direction of chemical instruments and methods, hydrocarbons, hydrocarbons, etc., to achieve the effect of reducing production cost and increasing product yield

Active Publication Date: 2014-08-27
JIANGSU EVERGREEN NEW MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The key technology lies in the production of m- and p-methylethylbenzene. The dehydrogenation technology of m- and p-methylethylbenzene is relatively mature, and it is no different from the dehydrogenation of ethylbenzene to produce styrene

Method used

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  • Method for producing 3-Methylstyrene and p-Methylstyrene
  • Method for producing 3-Methylstyrene and p-Methylstyrene
  • Method for producing 3-Methylstyrene and p-Methylstyrene

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Experimental program
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Effect test

Embodiment 1

[0024] Embodiment 1: A kind of production method of m- and p-methylstyrene, it uses m-, p-diethylbenzene dehydrogenation to produce divinylbenzene by-product m-p-diethylbenzene dehydrogenation liquid as raw material, directly extracts m-, p-diethylbenzene dehydrogenation liquid p-methylstyrene.

[0025] The raw material only contains m- and p-methylstyrene with a mass percentage of 4-5%. Through analysis and calculation, the average composition and mass percentage of the raw material are: 0.21% benzene, 0.36% toluene, 0.33% ethylbenzene, 0.03% m-xylene, 0.05% p-xylene, 0.79% methyl ethyl benzene, isobutylbenzene 0.02%, styrene 1.62%, m-diethylbenzene 4.76%, p-diethylbenzene 2.08%, α-methylstyrene 0.17%, m- and p-methylstyrene 4.89%, m-vinyl ethylbenzene 21.00%, p- Vinyl ethylbenzene 7.59%, m-divinylbenzene 37.06%, p-divinylbenzene 16.91%, naphthalene 0.99%.

[0026] The production method specifically comprises the following steps:

[0027] (1) No. 1 tower continuously enter...

Embodiment 2

[0030] Embodiment 2: The difference with Embodiment 1 is that the production method specifically includes the following steps:

[0031] (1) No. 1 tower continuously enters the raw material containing 4.91% m- and p-methylstyrene by mass percentage, and the tower top continuously adds quality as the polymerization inhibitor 4,6-dinitro-o-sec-butylphenol of raw material amount 30PPM , the number of theoretical plates is 45-55, the top temperature is controlled at 52.4°C, the kettle temperature is 78.3°C, and the pressure inside the tower is -0.0977MPa. The light components with a boiling point lower than 170°C come out from the top of the tower, and the mass of middle and p-methylstyrene is 100%. Mineral content is 40.02%;

[0032] (2) No. 1 tower top material is continuously entered into No. 2 tower, and the polymerization inhibitor 4,6-dinitro-o-sec-butylphenol that adds quality in the No. 2 tower is the amount of materials entering the tower 30PPM, and the number of theoretic...

Embodiment 3

[0034] Embodiment 3: The difference with Embodiment 1 is that the production method specifically includes the following steps:

[0035] (1) No. 1 tower continuously enters the raw material that contains 4.92% m- and p-methylstyrene in mass percentage composition, and the tower top continuously adds quality as the polymerization inhibitor 4,6-dinitro-o-sec-butylphenol of raw material amount 30PPM , the number of theoretical plates is 45-55, the top temperature is controlled at 52.9°C, the kettle temperature is 79.1°C, and the pressure inside the tower is -0.0969MPa. The light components with a boiling point lower than 170°C are discharged from the top of the tower, and the mass of middle and p-methylstyrene is 100%. Mineral content is 39.92%;

[0036] (2) No. 1 tower top material is continuously entered into No. 2 tower, and the polymerization inhibitor 4,6-dinitro-o-sec-butylphenol that adds quality in the No. 2 tower is the amount of materials entering the tower 30PPM, and th...

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Abstract

The invention discloses a method for producing 3-Methylstyrene and p-Methylstyrene. According to the method for producing 3-Methylstyrene and p-Methylstyrene, fractional distillation is directly conducted on secondary products, namely m-Diethylbenzene and p-diethylbenzene dehydrogenated liquid, of dehydrogenation production of divinylbenzene through m-Diethylbenzene and p-diethylbenzene, a high-purity 3-Methylstyrene and p-Methylstyrene product is obtained through extraction, and the purity of the high-purity 3-Methylstyrene and p-Methylstyrene product is over 99%. By the adoption of the method, the phenomenon that in the prior art, two steps including production of and 3- ethyltoluene and 4-ethyltoluene and dehydrogenation are needed is avoided, the production cost is remarkably reduced, and the product yield is remarkably increased.

Description

technical field [0001] The invention relates to a method for producing methylstyrene, in particular to a method for producing m- and p-methylstyrene. Background technique [0002] The traditional production of m- and p-methylstyrene is divided into two units, one is the production of m- and p-methylethylbenzene, and the other is the dehydrogenation of m- and p-methylethylbenzene. The key technology lies in the production of m- and p-methylethylbenzene. The dehydrogenation technology of m- and p-methylethylbenzene is relatively mature, and it is no different from the dehydrogenation of ethylbenzene to produce styrene. [0003] The production of m- and p-methylethylbenzene mainly has the following three methods. [0004] 1. Liquid phase alkylation. U.S. Dow Chemical Company proposes the method for producing m- and p-methylethylbenzene with ethylene p-toluene liquid-phase alkylation, with aluminum trichloride as catalyst, under normal pressure, reaction temperature 75~95 ℃ an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C15/46C07C4/04C07C5/327C07C7/04
Inventor 孙秋新
Owner JIANGSU EVERGREEN NEW MATERIAL TECH