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Ultra-stable Y-type molecular sieve as well as preparation method and application thereof

A technology of molecular sieve and B acid, applied in the direction of molecular sieve catalysts, including molecular sieve catalysts, chemical instruments and methods, etc., can solve the problems of poor activity and selectivity of low-temperature liquid-phase transalkylation catalysts, improve the diffusion of reactants, and reduce side reactions , The effect of high proportion of B acid

Pending Publication Date: 2022-05-13
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is the problem of poor activity and selectivity of low-temperature liquid-phase transalkylation catalysts existing in the prior art

Method used

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  • Ultra-stable Y-type molecular sieve as well as preparation method and application thereof
  • Ultra-stable Y-type molecular sieve as well as preparation method and application thereof
  • Ultra-stable Y-type molecular sieve as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0072] Take 1.2g HF and add it to 150g 0.2mol / L ammonium fluorosilicate solution, after stirring evenly, add 30g SiO 2 / Al 2 o 3 It is a Y-type molecular sieve of 5.8, and the temperature is raised to 60° C. and stirred for 30 minutes, and then filtered, washed and dried to obtain a pretreated Y molecular sieve.

[0073] Get 20g of pretreated molecular sieves and disperse them in 200g of ammonium chloride aqueous solution with a concentration of 9% by weight (calculated as ammonium chloride) for beating and stirring. After 20 minutes, add 1mol / L oxalic acid solution for acid treatment. The acid treatment temperature is 90°C. The time is 1h; finally wash with 20 times deionized water and dry at 120°C for 12h;

[0074] Then put it into a hydrothermal furnace and raise the temperature to 650°C. During the hydrothermal ultra-stabilization treatment process, the uniform heating rate is 8°C / min, and 100% by volume of steam is passed through for roasting for 2 hours, and dried at 1...

Embodiment 2

[0078] Take 0.7g NH 4 F was added to 190g of 0.2mol / L ammonium fluorosilicate solution, after stirring evenly, 36g of SiO 2 / Al 2 o 3 For 5.4 Y-type molecular sieves, heat up to 80°C and stir for 15 minutes, then filter, wash and dry to obtain pretreated Y molecular sieves.

[0079] Take 25g of pretreated molecular sieves and disperse them in 220g of ammonium sulfate aqueous solution with a concentration of 9% by weight (calculated as ammonium chloride) for beating and stirring. After 20 minutes, add 0.6mol / L acetic acid solution for acid treatment. The acid treatment temperature is 75°C. The time is 1.5h; finally wash with 20 times of deionized water and dry at 120°C for 12h; then put it into a hydrothermal furnace and raise the temperature to 670°C. , passed through 80 volume % steam for 2 h, and dried at 120° C. for 12 h to prepare a USY type molecular sieve, marked as sample USY-B.

[0080] NH on USY-B 3 - Characterization of TPD, Py-IR and XRD, the results of which a...

Embodiment 3

[0083] Take 1.0g HF and add it to 165g 0.2mol / L ammonium fluorosilicate solution, after stirring evenly, add 40g SiO 2 / Al 2 o 3 For 6.5 Y-type molecular sieves, heat up to 50°C and stir for 1 hour, then filter, wash and dry to obtain pretreated Y molecular sieves.

[0084] Take 30g of pretreated molecular sieves and disperse them in 280g of ammonium nitrate aqueous solution with a concentration of 10% by weight (calculated as ammonium chloride) for beating and stirring. After 20 minutes, add 1.4mol / L oxalic acid solution for acid treatment. The acid treatment temperature is 90°C. The time is 2 hours; finally wash with 20 times of deionized water and dry at 120°C for 12 hours; then put it into a hydrothermal furnace and raise the temperature to 630°C. Roasting with 100% by volume steam for 2 hours, and drying at 120° C. for 12 hours to prepare a USY type molecular sieve, marked as sample USY-C.

[0085] USY-C for NH 3 - Characterization of TPD, Py-IR and XRD with results s...

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Abstract

The invention discloses an ultra-stable Y-type molecular sieve as well as a preparation method and application thereof. According to the ultra-stable Y-type molecular sieve provided by the invention, the pore volume of mesopores accounts for more than 50% of the total pore volume; and the amount of the strong B acid accounts for 40-70% of the total amount of the B acid. The ultra-stable Y-type molecular sieve has the characteristics of high proportion of strong B acid and abundant mesopores, can complete the reaction at a lower reaction temperature when being used for the transalkylation reaction of benzene and polyalkylbenzene, not only can improve reactant diffusion and enhance the accessibility of activity, but also can reduce the occurrence of side reactions, and has good activity and selectivity.

Description

technical field [0001] The invention relates to an ultra-stable Y-type molecular sieve and its preparation method and application. The Y-type molecular sieve can be used in the transalkylation reaction of diethylbenzene and benzene. Background technique [0002] Ethylbenzene is an important basic organic raw material, mainly used to produce styrene, and styrene is an important monomer for the synthesis of polystyrene, styrene-butadiene rubber, ABS and SBS, etc. It is also used in pharmaceutical, coating and textile industries. very broad. [0003] Ethylbenzene is mainly synthesized through the alkylation reaction of benzene and ethylene. During the alkylation reaction process of benzene and ethylene, the reaction product ethylbenzene continues to undergo alkylation reaction with raw material ethylene to form diethylbenzene, triethylbenzene and For polyethylbenzene components such as tetraethylbenzene, in order to increase the yield of ethylbenzene, polyethylbenzene material...

Claims

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Application Information

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IPC IPC(8): C01B39/24B01J29/08B01J35/10B01J37/10B01J37/30C07C2/66C07C15/073
CPCC01B39/24B01J29/084B01J37/10B01J37/30C07C2/66C07C2529/08C01P2006/14C01P2006/12C01P2002/82C01P2002/72B01J35/617B01J35/635B01J35/633C07C15/073Y02P20/52
Inventor 郭冬冬孙洪敏宦明耀
Owner CHINA PETROLEUM & CHEM CORP
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