Method for disproportionation and transalkylation of toluene and heavy aromatic hydrocarbon

A disproportionation alkylation and alkylation transfer technology, applied in chemical instruments and methods, organic chemistry, hydrocarbons, etc., can solve the problem of low processing capacity of polycyclic aromatic hydrocarbons, improve processing capacity, reduce energy consumption for separation, The effect of simplifying the process flow

Active Publication Date: 2016-01-27
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is the problem of low processing capacity of polycyclic aromatic hydrocarbons in the prior art, and a new method for disproportionation and transalkylation of toluene and heavy aromatics is provided

Method used

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  • Method for disproportionation and transalkylation of toluene and heavy aromatic hydrocarbon
  • Method for disproportionation and transalkylation of toluene and heavy aromatic hydrocarbon

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Na 2 O content less than 0.1% (weight), SiO 2 / Al 2 o 3 66.7 grams of ZSM-5 molecular sieve with a molecular ratio of 80 and Na 2 γ-Al with O content less than 0.1% by weight 2 o 3 ·H 2 O57.1 g is evenly mixed, then a certain amount of dilute nitric acid and Tianqing powder are added and kneaded evenly, extruded into strips, roasted to make a carrier, and placed in an impregnation container after pelletizing. Dissolve a certain amount of chloroplatinic acid and stannous chloride in an appropriate amount of water, mix them evenly, and co-impregnate the surface of the carrier, dry at 120°C for 4 hours, and bake at 500°C for 3 hours to prepare the first layer of catalyst A1.

[0015] Na 2 O content less than 0.1% (weight), SiO 2 / Al 2 o 3 66.7 grams of Beta molecular sieve with a molecular ratio of 40 and Na 2 γ-Al with O content less than 0.1% by weight 2 o 3 ·H 2 O57.1 g was uniformly mixed, then added a certain amount of dilute nitric acid and ammonium mol...

Embodiment 2

[0018] Na 2 O content less than 0.1% (weight), SiO 2 / Al 2 o 3 66.7 grams of Mor molecular sieve with a molecular ratio of 50 and Na 2 γ-Al with O content less than 0.1% by weight 2 o 3 ·H 2 O57.1 g is evenly mixed, then a certain amount of dilute nitric acid and Tianqing powder are added and kneaded evenly, extruded into strips, roasted to make a carrier, and placed in an impregnation container after pelletizing. Dissolve a certain amount of palladium chloride and stannous chloride in an appropriate amount of water, mix them evenly, impregnate them on the surface of the carrier, dry at 120°C for 4 hours, and roast at 500°C for 3 hours to prepare the first layer of catalyst A2.

[0019] Na 2 O content less than 0.1% (weight), SiO 2 / Al 2 o 3 66.7 grams of ZSM-12 molecular sieve with a molecular ratio of 30 and Na 2 γ-Al with O content less than 0.1% by weight 2 o 3 ·H 2 O57.1 g was uniformly mixed, then added a certain amount of dilute nitric acid and ammonium mo...

Embodiment 3

[0022] Na 2 O content less than 0.1% (weight), SiO 2 / Al 2 o 3 66.7 grams of ZSM-5 molecular sieve with a molecular ratio of 40 and Na 2 γ-Al with O content less than 0.1% by weight 2 o 3 ·H 2 O57.1 g is evenly mixed, then a certain amount of dilute nitric acid and Tianqing powder are added and kneaded evenly, extruded into strips, roasted to make a carrier, and placed in an impregnation container after pelletizing. Dissolve a certain amount of chloroplatinic acid and germanium tetrachloride in an appropriate amount of water, mix them uniformly, impregnate them on the surface of the carrier, dry at 120°C for 4 hours, and calcinate at 500°C for 3 hours to prepare the first layer of catalyst A3.

[0023] Na 2 O content less than 0.1% (weight), SiO 2 / Al 2 o 3 66.7 grams of ZSM-12 molecular sieve with a molecular ratio of 50 and Na 2 γ-Al with O content less than 0.1% by weight 2 o 3 ·H 2 O57.1 g is evenly mixed, then a certain amount of dilute nitric acid is added,...

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Abstract

The invention relates to a method for disproportionation and transalkylation of toluene and heavy aromatic hydrocarbon. The method mainly solves the problem of inadequate ability of treating polycyclic aromatic hydrocarbon in the prior art. A technical scheme of the invention adopts the method for disproportionation and transalkylation of toluene and heavy aromatic hydrocarbon, and the method comprises the following steps: with toluene and heavy aromatic hydrocarbon with carbon nine or more containing polycyclic aromatic hydrocarbon as reaction raw materials, carrying out mixing with hydrogen and then carrying out preheating, then allowing the obtained mixture to successively pass through two layers of catalysts, subjecting reactants to heavy aromatic hydrocarbon light fraction reaction on a first layer of the catalysts so as to generate a first reaction product rich in monocyclic aromatic hydrocarbon, and subjecting the first reaction product to disproportionation and transalkylation reaction through a second layer of the catalysts so as to produce xylene; thus, the problem is well solved, and the method can be applied in industrial production of disproportionation and transalkylation of toluene and heavy aromatic hydrocarbon.

Description

technical field [0001] The invention relates to a method for the disproportionation and alkyl transfer of toluene and heavy aromatic hydrocarbons. Background technique [0002] Using toluene or benzene with carbon nine and above heavy aromatics (C 9 + A) Transalkylation reaction is an effective method to increase xylene production and is widely used. Toluene and C 9 + The reaction network between A is complex, involving ring-opening cracking of benzene ring, dealkylation to light weight, disproportionation and transalkylation, etc. However, the acid properties and metal hydrogenation performance required by each reaction process are not the same. Therefore, it is difficult to simultaneously achieve the optimal level of each reaction in the same reactor or the same catalyst system. [0003] With the C in the reaction raw material 9 + The higher the content of A, especially the higher the content of polycyclic aromatic hydrocarbons, the more likely the catalyst will be ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C6/12C07C15/08C07C15/24
Inventor 李经球郭宏利杨德琴孔德金
Owner CHINA PETROLEUM & CHEM CORP
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