Method for disproportionation and transalkylation of toluene heavy aromatics

A technology of transalkylation and toluene, which is applied in chemical instruments and methods, organic chemistry, hydrocarbons, etc., can solve the problems of high loss rate of aromatic rings and high hydrogen consumption in reactions, and achieve good stability, good technical effects, and reduced Aromatic ring loss rate and effect of reaction hydrogen consumption

Inactive Publication Date: 2013-05-29
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is that the existing toluene and heavy aromatics disproportionation and transalkylation catalyst technology have the problems of high loss rate of aromatic ring and high reaction hydrogen consumption

Method used

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  • Method for disproportionation and transalkylation of toluene heavy aromatics

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Na 2 O content less than 0.1% (weight), SiO 2 / Al 2 o 3 66.7 grams of ammonium type beta zeolite 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 O 57.1 grams are uniformly mixed, then added a certain amount of dilute nitric acid and Tian Qing powder, kneaded evenly, extruded into strips, roasted to make a carrier, and placed in an impregnation container after dicing. The carrier was impregnated with a certain amount of chloroplatinic acid solution, dried at 120°C for 4 hours, calcined at 500°C for 3 hours, and then reduced at 400°C to obtain catalyst A (0.1 wt% Pt / β).

[0018] Take 100ml of catalyst A, place it in a tubular reactor, feed 500ml / min of hydrogen, gasify a certain amount of dimethyl disulfide and mix it with hydrogen. The sulfur content in the mixed gas is 300ppm. Pass the mixed gas once through the catalyst bed, and carry out sulfidation at 400°C, so that the molar ratio of sulfur content to metal conten...

Embodiment 2

[0020] Na 2 O content less than 0.1% (weight), SiO 2 / Al 2 o 3 66.7 grams of ammonium mordenite 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 O 57.1 grams are uniformly mixed, then added a certain amount of dilute nitric acid and Tian Qing powder, kneaded evenly, extruded into strips, roasted to make a carrier, and placed in an impregnation container after dicing. The carrier was impregnated with a certain amount of palladium chloride solution, dried at 120°C for 4 hours, calcined at 500°C for 3 hours, and then reduced at 400°C to prepare catalyst B (0.2wt% Pd / mordenite). Catalyst sulfidation conditions and performance evaluation conditions are as in Example 1.

Embodiment 3

[0022] Take 100ml of catalyst A, place it in a tubular reactor, feed 500ml / min of hydrogen, gasify a certain amount of dimethyl disulfide and mix it with hydrogen. The sulfur content in the mixed gas is 300ppm. Pass the mixed gas once through the catalyst bed, and carry out sulfidation at 450°C, so that the molar ratio of sulfur content to metal content on the catalyst reaches 0.3, and stop injecting sulfide. Inject containing toluene and C 9 + The material of A is contacted with the catalyst for reaction, and the catalyst performance evaluation conditions are as in Example 1.

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Abstract

The invention relates to a method for disproportionation and transalkylation of toluene heavy aromatics and mainly solves the problems that aromatic ring loss rate is high, reaction hydrogen consumption is high and the like during reaction in the prior art. Catalyst used in the method includes: (a) at least one of platinum or palladium metals; and (b) at least one of ZSM-12, mordenite and zeolite. The catalyst is preprocessed in a way that the catalyst is contacted with sulfur compounds at 200-600 DEG C to allow sulfur content of the catalyst to be not larger than metal absorption saturation value. The problems that aromatic ring loss rate is high, reaction hydrogen consumption is high and the like are solved. The method is applicable to industrial production of disproportionation and transalkylation of toluene heavy aromatics.

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] The p-xylene in the C8 aromatics is one of the main basic organic raw materials in the petrochemical industry, and has a wide range of uses in many chemical production fields such as chemical fibers, synthetic resins, pesticides, and medicines. In order to increase xylene production, use toluene disproportionation or toluene and carbon nine and above heavy aromatics (C 9 + A) Transalkylation reaction generates benzene and C8 aromatic hydrocarbons to achieve the purpose of increasing the production of p-xylene. [0003] With the increasing weight of upstream reformate, the comprehensive utilization of heavy aromatics has become a concern of people. Carbon nine aromatic hydrocarbons (C 9 A) There is a relatively mature utilization technology to increase the production of xylene through the transalky...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C15/08C07C6/12B01J29/74B01J29/22B01J37/20
CPCY02P20/52
Inventor 郭宏利孔德金李经球李华英
Owner CHINA PETROLEUM & CHEM CORP
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