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Method for toluene disproportionation and/or transalkylation reaction

A technology of alkylation transfer and toluene disproportionation, which is applied in chemical instruments and methods, chemical/physical processes, catalysts, etc., can solve the problems affecting the purity of benzene products, poor selectivity, and low activity of cracking catalysts, so as to improve purity and reduce strong acid Center, the effect of increasing the cracking activity

Active Publication Date: 2018-07-10
CHINA PETROLEUM & CHEM CORP +1
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  • Description
  • Claims
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Problems solved by technology

[0003] The technical problem to be solved by the present invention is that the prior art has the problems of low cracking catalyst activity and poor selectivity, which affect the purity of product benzene, and provides a new method for toluene disproportionation and / or transalkylation reaction

Method used

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  • Method for toluene disproportionation and/or transalkylation reaction

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preparation example Construction

[0035] The reaction conditions in the second reaction zone include: reaction temperature 300-500°C, reaction pressure 1.0-5.0MPa, weight space velocity 1.0-20.0 hours -1 , Hydrocarbon ratio 2-8. The second catalyst includes the following components in parts by weight: a) 20 to 80 parts of at least one second zeolite selected from mordenite, ZSM-5, beta zeolite and Y zeolite; b) 0.05% ~5 parts of at least one auxiliary agent selected from group VIII, IIB, IIA group elements or their oxides; c) 10~40 parts of binder. The preparation method of the second catalyst comprises the following steps: a) forming the second zeolite and a binder; b) loading the precursor metal containing the promoter on the shaped catalyst by means of impregnation, precipitation, adsorption and ion exchange; The methods of impregnation, precipitation, adsorption and ion exchange are well known in the art; c) calcining the molded catalyst loaded with auxiliary components at a temperature of 400-600° C. for...

Embodiment 1

[0052] 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 O 57.1 grams are uniformly mixed, then added dilute nitric acid and Tianqing powder, kneaded evenly, extruded, roasted to make a carrier, and placed in an impregnation container after dicing. The first catalyst A1 was obtained by dissolving chloroplatinic acid and stannous chloride in water, mixing them evenly, co-impregnating the surface of the carrier, drying at 120°C for 4 hours, and calcining at 500°C for 3 hours.

[0053] SiO 2 / Al 2 o 3 25 mordenite 195g with γ-Al 2 o 3 Mix 107.1g, then add dilute nitric acid and safflower powder, knead evenly, extrude into strips, roast to make a carrier, cut into pellets and place in an impregnation container. The metal precursor iridium chloride was dissolved in water, mixed evenly, impregnated on the surface of the carrier, dried a...

Embodiment 2

[0056] SiO 2 / Al 2 o 3 25 mordenite 195g with γ-Al 2 o 3 Mix 107.1g, then add dilute nitric acid and safflower powder, knead evenly, extrude into strips, roast to make a carrier, cut into pellets and place in an impregnation container. The metal precursor iridium chloride was dissolved in water, mixed evenly, impregnated on the surface of the carrier, dried at 120°C for 4 hours, and calcined at 500°C for 3 hours to obtain catalyst B2.

[0057] Take 16g of A1 and 4g of B2 catalysts, fill them in a fixed bed reactor from top to bottom, pass in hydrogen, raise the temperature to 400°C, purging for two hours for reduction activation, the reaction temperature is 400°C, the pressure is 3MPa, according to WHSV=2.5 h -1 Working condition feed, hydrogen hydrocarbon molecular ratio 3.0. The raw material weight composition is toluene / methylcyclohexane=99.5 / 0.5. The catalyst reaction performance results are shown in Table 1.

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Abstract

The invention relates to a method for toluene disproportionation and / or a transalkylation reaction. The method mainly solves the problems in the prior art that the activity of cracking catalysts is low, the selectivity of the cracking catalysts is poor, and the purity of product benzene is influenced. The method comprises the following steps that raw material toluene enters a first reaction zone for disproportionation and / or the transalkylation reaction to obtain a material stream containing benzene and non-aromatic hydrocarbon; the material stream containing benzene and non-aromatic hydrocarbon enters a second reaction zone to be in contact with a second catalyst to obtain a product material stream with the benzene purity greater than 99.85% by weight. The second catalyst comprises, by weight, 20-80 parts of at least one second zeolite selected from the group consisting of mordenite, ZSM-5, beta zeolite and Y zeolite, 0.05-5 parts of at least one auxiliary selected from the group consisting of nickel, zinc, strontium, magnesium and iridium or iridium oxide and 10-40 parts of binder. According to the technical scheme, the problems are better met, and the method can be used in industrial production of toluene disproportionation and / or the transalkylation reaction.

Description

technical field [0001] The invention relates to a method for toluene disproportionation and / or transalkylation reaction. Background technique [0002] Benzene, toluene and xylene (abbreviated as BTX aromatics) are important basic organic raw materials in modern petrochemical industry. Silico-alumina molecular sieve is a crystalline aluminosilicate zeolite, in which silicon atoms and aluminum atoms in the crystal structure are connected to each other through oxygen atoms to form a network structure, and are often used as aromatic hydrocarbon disproportionation and transalkylation catalysts. In addition, metals such as platinum, rhenium, molybdenum, and bismuth are usually introduced into the molecular sieve catalyst to improve the stability of the catalyst and increase the processing capacity of heavy aromatics. The document US2005763720A discloses a transalkylation catalyst containing platinum metal. The catalyst has good stability after steam or presulfurization treatment,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C6/12C07C15/04B01J29/80
CPCB01J29/80C07C6/123C07C2529/80C07C15/04Y02P20/52
Inventor 孔德金王晓晨李经球李华英
Owner CHINA PETROLEUM & CHEM CORP
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