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A modified zeolite catalyst and applications thereof in toluene preparation through isopropyltoluene cracking

A technology of isopropyl toluene and modified zeolite, which is applied in the direction of molecular sieve catalysts, physical/chemical process catalysts, organic chemistry, etc., can solve the problem that catalysts are difficult to meet the requirements of industrial production, the selectivity of toluene is not high, and the yield of toluene is not high. High-level problems, to achieve stable and efficient catalytic activity, improve catalytic activity, and good technical effects

Active Publication Date: 2016-05-18
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Although the above-mentioned European patent EP231569 and Chinese patent CN1214961A all provide modified zeolite as a catalyst for isopropyltoluene dealkylation, the yield of the target product toluene of its cracking is not high, only about 70%. The selectivity of its catalyst to toluene is not high, which is easy to cause waste of resources
Therefore, its catalyst is difficult to meet the requirements of industrial production

Method used

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  • A modified zeolite catalyst and applications thereof in toluene preparation through isopropyltoluene cracking
  • A modified zeolite catalyst and applications thereof in toluene preparation through isopropyltoluene cracking
  • A modified zeolite catalyst and applications thereof in toluene preparation through isopropyltoluene cracking

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Effect test

Embodiment 1

[0024] Embodiment 1 catalyst preparation 1

[0025] 20 grams of Y-type zeolite raw powder (SiO 2 / Al 2 o 3 =15) Exchange with 0.5M ammonium nitrate aqueous solution for 1 hour, filter off the supernatant and wash twice, and repeat the above operation 2-3 times. Dry it at room temperature, and bake it in a muffle furnace at 450° C. for 4 hours to obtain a modified Y zeolite. with 5 g Al 2 o 3 Shaped, dried at room temperature, and fired in a muffle furnace at 550°C for 4 hours. Grind and sieve 20-40 mesh particles, weigh 10 grams, immerse in 6 ml of aqueous solution containing 3 grams of nickel nitrate hexahydrate by equal volume impregnation method, dry at 80°C and transfer to muffle furnace at 520°C Calcined for 4 hours to obtain catalyst A.

Embodiment 2

[0026] Embodiment 2 catalyst preparation 2

[0027] Weigh 20 grams of the ZSM-5 type zeolite prototype (SiO 2 / Al 2 o 3 =70), glued with 15 grams of 30% silica sol, extruded, dried at room temperature, and fired at 520°C for 4 hours. Grind and sieve 20-40 mesh particles, weigh 10 grams, immerse in 20 ml of an aqueous solution containing 8 grams of nickel nitrate hexahydrate for half an hour, filter off the clear liquid, dry at room temperature, and then roast at 350 ° C 4 hours. Repeat the immersion in the above solution once more, dry at room temperature, and then bake in a muffle furnace at 500° C. for 4 hours to obtain catalyst B.

Embodiment 3

[0028] Embodiment 3 catalyst preparation 3

[0029] Weigh 20 grams of the MOR mordenite prototype (SiO 2 / Al 2 o 3 =10), glued with 18 grams of 30% silica sol, extruded, dried at room temperature, and baked at 520°C for 4 hours. Grind and sieve 20-40 mesh particles, weigh 10 grams, immerse an equal volume in 6 milliliters of an aqueous solution containing 0.1 grams of RuCl3, dry at 80°C, and then bake in a muffle furnace at 500°C for 4 hours , to obtain catalyst C.

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Abstract

A modified zeolite catalyst is provided by the invention and is applied to catalyze isopropyltoluene cracking to prepare toluene. The catalyst is prepared by modifying zeolite adopting one or more selected from Y type zeolite, ZSM-5 type zeolite and MOR type mordenite, by adopting one or more than two selected from Al2O3, SiO2 or TiO2 as an adhesive, and by steps of performing extrusion forming, calcinating, and modifying a prepared composition with one or more selected from transition metals comprising Cr, Ni, Co and Zn, precious metals comprising Rh, Ru, Pt and Pd, and rare earth metals comprising La, Ce and Er. In a reaction in which the isopropyltoluene cracking is catalyzed to prepare the toluene, the catalyst shows high catalytic activity, toluene selectivity and stability at low reaction temperature and pressure, thus achieving low energy consumption and a high yield of the reaction.

Description

technical field [0001] The invention relates to catalyst technology, and in particular provides a catalyst for catalyzing the cracking of cumene toluene to remove isopropyl toluene and a preparation method thereof, and applies the catalyst to the reaction of catalyzing the cracking of cumene toluene to produce toluene. Background technique [0002] In the field of petrochemical and fine chemical industry, the cracking and dealkylation reaction of alkylbenzene has always been one of the important topics that people pay attention to. In petrochemical industry, dialkylbenzene in alkylbenzene is usually a mixture of three isomers of 1,2-, 1,3- and 1,4-dialkylbenzene, and these three isomers It is difficult to separate it by distillation. Therefore, a dealkylation reaction can be used to selectively remove an alkyl moiety of one of the undesired isomers, so that the undesired isomer can be easily separated and removed therefrom. In fine chemical industry, dealkylation reaction ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/14B01J29/46B01J29/22B01J29/16B01J29/08C07C15/06C07C4/18
CPCY02P20/52
Inventor 孙承林顾彬李先如荣欣卫皇曌王森
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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