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Alkylaromatic conversion catalyst

A catalyst, alkyl aromatic technology, applied in the field of alkyl aromatic hydrocarbon conversion catalysts, can solve problems such as affecting catalyst performance, expensive procedures, complexity, etc.

Active Publication Date: 2019-05-21
SHELL INT RES MAATSCHAPPIJ BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] However, although dual or triple catalyst systems have been described in the art, there is a continuing need to develop catalyst systems for combined ethylbenzene dealkylation and xylene isomerization that not only exhibit favorable xylene isomerization Combined with high ethylbenzene conversion, it can also be produced without the need for selective pretreatment with organosilicon compounds or coke deposition, which are complex and expensive procedures and can affect the catalyst by causing pore clogging performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] Embodiment 1 (manufacture of catalyst A)

[0069] 92 g of solid sodium hydroxide and 125 g of L-tartaric acid were dissolved in 3.5 l of water, and 175 g of sodium aluminate solution was added thereto to prepare a uniform solution. Then, 660 g of silicic acid powder was slowly added to the mixed solution with stirring to prepare a uniform aqueous reaction mixture. The reaction mixture was placed in an autoclave, and after the autoclave was closed, it was allowed to react at 160° C. for 72 hours with stirring. Thereafter, the reaction product was taken out of the autoclave, washed with distilled water until its pH was almost neutral, then filtered and dried overnight at 120 °C. The product thus obtained is ZSM-5, the properties of which are shown in Table 1 below. This zeolite is hereinafter referred to as zeolite A.

[0070] Table 1

[0071]

[0072]

[0073] Micropore and mesopore volumes are each deduced from nitrogen adsorption and desorption isotherms ...

Embodiment 2

[0077] Embodiment 2 (manufacture of catalyst B)

[0078] A sample of Support A as described in Example 1 was dealuminated by treating the sample with a 0.02M aqueous solution of ammonium hexafluorosilicate. The samples thus treated were subsequently washed, dried and calcined.

[0079] The support thus obtained was impregnated in the pore volume with a solution containing platinum (but without tin) to obtain a final catalyst with 0.025 wt.% platinum based on the total catalyst. After impregnation is complete, the catalyst is dried and then calcined. The resulting catalyst is referred to as Catalyst B hereinafter.

Embodiment 3

[0080] Embodiment 3 (manufacture of catalyst C)

[0081] The support was prepared from ZSM-5 with a mesopore volume of 0.29 ml / g, a number average crystallite size of 28 nm and a silica to alumina molar ratio of 80. This ZSM-5 is commercially available from Zeolyst as "ZD13008", hereinafter referred to as Zeolite C. The high and medium pore volume in the zeolite translates to the high and medium pore volume of the zeolite in the catalyst.

[0082] Zeolite powder was mixed with low sodium grade silica ("Sipernat 50" from Degussa) and ammonium stabilized commercial silica sol (sold under the trade name "Bindzil 30NH3" by the company Eka Chemicals) and extruded To obtain a support comprising 60 wt.% of zeolite, 26.6 wt.% of "Sipernat 50" and 13.4 wt.% of silica sol on a dry basis.

[0083] The raw extrudates were dried and calcined at 500°C to achieve sufficient strength for industrial applications. The obtained carrier is hereinafter referred to as carrier C.

[0084] The ...

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Abstract

Process for dealkylation of alkylaromatic compounds which process comprises contacting an alkylaromatic feedstock with i) a first catalyst comprising a) a carrier comprising of from 20 to 70 wt. % ofrefractory oxide binder and of from 30 to 80 wt. % of dealuminated ZSM-5 having a crystallite size of from 500 to 10,000 nm and a silica to alumina molar ratio (SAR) of from 20 to 100; b) of from 0.001 to 5 wt. % metal chosen from the group consisting of Groups 6, 9 and 10; and optionally c) up to 0.5 wt. % of a Group 14 metal, and ii) a subsequent catalyst comprising a) a carrier comprising of from 20 to 70 wt. % of refractory oxide binder and of from 30 to 80 wt. % of ZSM-5 having a crystallite size of from 3 to 100 nm and a SAR of from 20 to 200; b) of from 0.001 to 5 wt. % of metal chosenfrom the group consisting of Groups 6, 9 and 10; and optionally c) up to 0.5 wt. % of a Group 14 metal.

Description

[0001] The present invention relates to an alkyl aromatic hydrocarbon conversion catalyst, its preparation and its use in ethylbenzene dealkylation. Background technique [0002] Ethylbenzene (EB) is one of the aromatic hydrocarbons obtainable from naphtha cracking or reformate. Reformate is an aromatic product obtained by catalytic conversion of straight-run hydrocarbons boiling in the range of 70°C to 190°C, such as straight-run naphtha. Catalysts used to produce reformate are typically platinum on alumina catalysts. The reformate feedstock itself is obtained by fractionation or distillation of petroleum crude oil and its composition varies depending on the source of the crude oil, but is usually low in aromatics. Upon conversion to reformate, the aromatic content increases significantly and the resulting mixture of hydrocarbons becomes highly desirable as a source of valuable chemical intermediates and as a component of gasoline. The main components are a group of aromati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C4/18C07C5/27C07C15/04C07C15/067B01J29/00
CPCC07C4/18C07C5/2708C07C2529/44Y02P20/52B01J37/04B01J23/626B01J29/40B01J29/80B01J37/0201B01J2229/16B01J2229/37B01J29/44C01B39/38B01J35/19B01J35/30B01J35/40C07C15/04C07C15/067B01J37/0009B01J35/613B01J35/615B01J35/633B01J37/0018B01J37/0236B01J37/08C01P2002/60C01P2006/12C01P2006/14
Inventor H-X·李G·萨巴特·普加达斯I·M·范维格切尔Y·扬森
Owner SHELL INT RES MAATSCHAPPIJ BV
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