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Arene alkyl transferring and dealkylation reaction method of low ethyl benzene by-product

A technology of aromatic hydrocarbon alkyl and by-products, which is applied in the field of increasing xylene production, can solve the problem of low selectivity, and achieve the effects of high selectivity, high selectivity and high efficiency

Active Publication Date: 2008-06-04
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The technical problem to be solved by the present invention is that the high content of ethylbenzene by-products in the reaction products in the prior art results in low selectivity of xylene target products in mixed C8 products, and there is no choice for the dealkylation of aromatic side chain alkyl groups. To solve the problem of nature, provide a new method for aromatics transalkylation and dealkylation reaction with low ethylbenzene by-products

Method used

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  • Arene alkyl transferring and dealkylation reaction method of low ethyl benzene by-product
  • Arene alkyl transferring and dealkylation reaction method of low ethyl benzene by-product

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Effect test

Embodiment 1

[0027] Using Na 2 O content less than 0.1% (weight), SiO 2 / Al 2 o 3 22 grams of ammonium mordenite with a molecular ratio of 23 and Na 2 O content less than 0.1% (weight), SiO 2 / Al 2 o 3 45 grams of ammonium zeolite beta with a molecular ratio of 24 and Na 2 Al with an O content of less than 0.1% by weight 2 o 3 Mix 42 grams evenly, and then make an aqueous solution with ammonium molybdate for impregnation; add dilute nitric acid solution of bismuth nitrate, magnesium nitrate, and cerium nitrate to the impregnated powder, knead fully and evenly, carry out extrusion molding, and roast at 500°C to make a catalyst a.

Embodiment 2

[0029] Using Na 2 O content less than 0.1% (weight), SiO 2 / Al 2 o 3 36 grams of ammonium mordenite with a molecular ratio of 22 and Na 2 O content less than 0.1% (weight), SiO 2 / Al 2 o 3 25 grams of ammonium zeolite beta with a molecular ratio of 25 and Na 2 Al with an O content of less than 0.1% by weight 2 o 3 Mix 35 grams evenly, and then use ammonium molybdate to prepare an aqueous solution for impregnation; add a certain amount of dilute nitric acid solution, bismuth nitrate, nickel nitrate, lanthanum nitrate, iron nitrate and palladium chloride to the impregnated powder, knead fully and evenly, and carry out extrusion Bar forming, 500 ℃ calcined to make catalyst B.

Embodiment 3

[0031] Using Na 2 O content less than 0.1% (weight), SiO 2 / Al 2 o 3 Ammonium mordenite with a molecular ratio of 22 and 12 grams of Na 2 O content less than 0.1% (weight), SiO 2 / Al 2 o 3 62 grams of ammonium β zeolite with a molecular ratio of 30 and Na 2 Al with an O content of less than 0.1% by weight 2 o 3 Mix 38 grams evenly, then add a certain amount of dilute nitric acid solution, cobalt acetate, tetraammonium platinum chloride, stannous chloride, nickel nitrate and lanthanum nitrate, fully knead evenly, carry out extrusion molding, and roast at 500°C to make catalyst C .

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Abstract

The invention relates to a transalkylation of aromatics and dealkylation method that produces low content of ethyl benzene by-product, and mainly solves the problem that reaction products have high content of the ethyl benzene by-product in the prior art, thus causing low selectivity to target product of dimethyl benzene among mixed carbon-eight products and no selectivity to dealkylation of side chains of arene alkylation. The invention adopts the technical proposal of producing target product of dimethyl benzene through reaction in the fixed reaction bed by adopting carbon-nine and above heavy aromatics and methyl benzene as raw material or adopting carbon-nine and the heavy aromatics as raw material, adopting catalyst containing zeolite with SiO2 / Al2O3 mole ratio of 12-70 by weight proportion, oxide that is selected from at least one of molybdenum, palladium or nickel, oxide that is selected from at least one of ferrum, bismuth, tin or platinum and oxide that is selected from at least one of cerium, lanthanum, magnesium or titanium, and in reaction conditions of weight space velocity of 1.0 to 3.5h<-1>, reaction temperature of 350 - 460 DEG C, reaction pressure of 1.5 to 3.5MPa and molecular proportion of hydrogen / hydrocarbon of 2.0 to 80, thereby properly solving the problem. The method can be used for industrial production of carbon-nine and above heavy aromatics or transalkylation of phenylmethane and dealkylation to reduce content of the ethyl benzene by-product and increase content of the dimethyl benzene product.

Description

technical field [0001] The present invention relates to a kind of low ethylbenzene by-product aromatics transalkylation and dealkylation reaction method, especially about the ability to use carbon nine and above heavy aromatics and toluene as raw materials or use carbon nine and above heavy aromatics alone As a raw material, through the transalkylation and dealkylation reaction, the reaction method of reducing the side reaction and the ethylbenzene by-product content in the product so as to increase the production of xylene products. Background technique [0002] Para-xylene in xylene is one of the main basic organic raw materials in the petrochemical industry. It is widely used in chemical fiber, synthetic resin, pesticide, medicine, plastic and many other chemical production fields. In order to increase xylene production, use toluene disproportionation or toluene and carbon nine and above heavy aromatics (C 9 + A) disproportionation and transalkylation reaction to genera...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C4/18C07C6/12B01J29/80B01J29/076
CPCY02P20/52
Inventor 谢在库朱志荣祁晓岚孔德金左煜张惠明
Owner CHINA PETROLEUM & CHEM CORP
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