Method for Selective Passivation of Transalkylation Catalysts

A technology of transalkylation and catalyst, which is applied in the direction of catalyst, catalyst protection, molecular sieve catalyst, etc. It can solve the problems of obvious side reaction of benzene ring hydrogenation and high hydrogen consumption of reaction, and achieve the effect of suppressing excessive hydrogenation side reaction

Active Publication Date: 2020-07-03
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is in order to overcome existing benzene / toluene and carbon nine and above heavy aromatics (C 9 + A) In transalkylation technology, there are obvious side reactions of benzene ring hydrogenation, and the problem of high hydrogen consumption in the reaction

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  • Method for Selective Passivation of Transalkylation Catalysts

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Embodiment 1

[0017] Na 2 O content is less than 0.1% (weight) MOR molecular sieve 67 grams and with 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. A certain amount of chloroplatinic acid was dissolved in water, 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 A

[0018] In a fixed-bed reactor, 10 grams of catalyst A was installed, hydrogen gas was passed through, the temperature was raised to 400° C., the reduction activation was carried out by purging for 2 hours, and then selective passivation treatment was carried out. The passivation conditions are: the reaction temperature is 380°C, the pressure is 2.0MPa, and the feed WHSV=3h -1 , the molecular ratio of hydrogen to hydro...

Embodiment 2

[0020] In a fixed-bed reactor, 10 grams of catalyst A was installed, hydrogen gas was passed through, the temperature was raised to 400° C., the reduction activation was carried out by purging for 2 hours, and then selective passivation treatment was carried out. The passivation conditions are: the reaction temperature is 380°C, the pressure is 2.0MPa, and the feed WHSV=3h -1 , the molecular ratio of hydrogen to hydrocarbon is 4.0, and the weight composition of raw material is toluene / C 9 + A=50 / 50, material C 9 + A contains 2% methylnaphthalene. C 9 A raw material weight composition is: 4.2% of propylbenzene, 29.04% of methyl ethylbenzene, 59.6% of trimethylbenzene. After 100 hours of passivation, switch to normal reaction conditions: the reaction temperature is 360°C, the pressure is 3.0MPa, and the feed WHSV=4h -1 , the molecular ratio of hydrogen to hydrocarbon is 2.0, and the weight composition of raw material is toluene / C 9 + A=50 / 50, material C 9 + The content...

Embodiment 3

[0022] In a fixed-bed reactor, 10 grams of catalyst A was installed, hydrogen gas was passed through, the temperature was raised to 400° C., the reduction activation was carried out by purging for 2 hours, and then selective passivation treatment was carried out. The passivation conditions are: the reaction temperature is 410°C, the pressure is 2.0MPa, and the feed WHSV=3h -1 , the molecular ratio of hydrogen to hydrocarbon is 4.0, and the weight composition of raw material is toluene / C 9 + A=50 / 50, material C 9 + A contains 4% naphthalene. C 9 A raw material weight composition is: 4.2% of propylbenzene, 29.04% of methyl ethylbenzene, 59.6% of trimethylbenzene. After 100 hours of passivation, switch to normal reaction conditions: the reaction temperature is 360°C, the pressure is 3.0MPa, and the feed WHSV=4h -1 , the molecular ratio of hydrogen to hydrocarbon is 2.0, and the weight composition of raw material is toluene / C 9 + A=50 / 50, material C 9 + The content of na...

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Abstract

The invention discloses a selective passivation method for a transalkylation catalyst. The selective passivation method for the transalkylation catalyst in the invention mainly overcomes the problemsof high initial activity of catalysts and high loss rate of aromatic rings in the prior art. According to the invention, benzene / toluene and C9+ heavy aromatic hydrocarbons are used as raw materials and are allowed to undergo a reaction on the surface of the catalyst in the presence of a competitive adsorbent with an aromatic ring structure so as to produce xylene, and side reactions in hydrogenation and ring opening of phenyl rings can be effectively inhibited at the same time, and the competitive adsorbent is at least one selected from bicyclic or polycyclic aromatic hydrocarbons. The methodprovided by the invention can overcome the problem of the high aromatic hydrocarbon loss rate of the transalkylation catalyst in an initial stage and is applicable to the industrial conversion reactions of aromatic hydrocarbons.

Description

technical field [0001] The invention relates to a catalyst selective passivation method. Background technique [0002] Using toluene and C9 + A. Transalkylation reaction to increase the production of xylene is a method that effectively utilizes heavy aromatics to increase the production of xylene, and is widely used. At present, the utilization of C9+ heavy aromatics by the disproportionation and transalkylation unit mainly focuses on the utilization of C9A and some C10A. In order to improve the heavy aromatics processing capacity of the catalyst and improve the stability of the catalyst, the toluene disproportionation and transalkylation catalysts generally contain molecular sieves A bifunctional catalyst with a metal component and a hydrogenation metal component. Molecular sieves ZSM-5, MOR, and Beta have all been reported as catalysts for toluene disproportionation and transalkylation, while metals such as platinum, palladium, rhenium, and molybdenum are also commonly u...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/22B01J33/00C07C6/12C07C15/08
CPCB01J29/22B01J33/00B01J2229/18C07C6/126C07C2529/22C07C15/08Y02P20/52
Inventor 李经球李华英孔德金
Owner CHINA PETROLEUM & CHEM CORP
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