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Molecular sieve-containing hydrated alumina composition and molded hydrated alumina material, and preparation methods and application thereof, and catalyst and preparation method thereof

A technology of hydrated alumina and alumina trihydrate, which is applied in molecular sieve catalysts, organic compound/hydride/coordination complex catalysts, chemical instruments and methods, etc., and can solve transfer difficulties, secondary dust pollution, molding interference, etc. problems, to achieve the effect of avoiding dust pollution, simplifying the overall process flow, and reducing operating energy consumption

Active Publication Date: 2018-05-11
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] (1) Pseudo-boehmite that has not been completely dried has strong viscosity, is difficult to transfer, and easily causes secondary dust pollution;
[0015] (2) Drying starts from the surface. The drying of the wet solid product separated from the mixture obtained from the gelling reaction is incomplete drying, so there is a sandwich biscuit phenomenon, that is, the surface of part of the pseudo-boehmite is dried (that is, the dried surface is substantially free of free water), while the interior is still wet (that is, for the non-dried interior, the content of free water is basically maintained at the level before drying), since the surface is dried, Therefore, hard particles are formed. When peptizing agent and / or binder are added to this incompletely dried pseudo-boehmite and kneaded, the hard particles formed during the drying process are in the process of extrusion. It is easy to cause blockage and affect production efficiency;
[0016] (3) It is difficult to stably control the dry base of pseudo-boehmite. The instability of the dry base will cause great interference to the molding process, making the molding process very unstable, resulting in an increase in the amount of unqualified products and low production efficiency;
[0017] (4) CN103769118A adopts a conventional molding process when molding, yet because the dry basis (35%-50%) of the pseudo-boehmite it adopts is far lower than the conventional dry basis content (about 70%), that is The water content is high, and there is basically no extrusion pressure during the extrusion molding process. Therefore, the carrier obtained after the extrudate is dried and roasted has basically no mechanical strength. As long as a little external force is applied, it will be pulverized and has no possibility of industrial application. sex, which is the biggest problem facing the technology

Method used

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  • Molecular sieve-containing hydrated alumina composition and molded hydrated alumina material, and preparation methods and application thereof, and catalyst and preparation method thereof
  • Molecular sieve-containing hydrated alumina composition and molded hydrated alumina material, and preparation methods and application thereof, and catalyst and preparation method thereof
  • Molecular sieve-containing hydrated alumina composition and molded hydrated alumina material, and preparation methods and application thereof, and catalyst and preparation method thereof

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preparation example Construction

[0107] According to the preparation method of the hydrated alumina composition of the present invention, the raw material mixture contains hydrated alumina wet gel, Y-type molecular sieve, ZSM-type molecular sieve and a compound having at least two proton acceptor sites. The compound having at least two proton acceptor sites, as well as the Y-type molecular sieve and the ZSM-type molecular sieve have been described in detail above, and will not be repeated here.

[0108] The hydrated alumina wet gel can be synthesized by conventional methods, such as one or more of precipitation method (including acid method and alkali method), hydrolysis method, seed separation method and rapid dehydration method. Generally, it is obtained by optionally aging the hydrated alumina gel solution, followed by washing and solid-liquid separation.

[0109] The precipitation method includes acid method and alkali method. The acid method is to carry out precipitation reaction of aluminum salt with b...

Embodiment 1

[0245] The alumina hydrate wet gel used in this example is a quasi-alumina hydrogel solution prepared by the acid method (sodium metaaluminate-aluminum sulfate method, obtained from Sinopec Changling Branch) after washing and filtering. The wet filter cake of boehmite (the wet filter cake is coded as SLB-1), after measurement, the i value of the wet filter cake is 78.2%.

[0246] (1) Add 4.926kg Y-type molecular sieve (purchased from Sinopec Catalyst Changling Branch Company, unit cell constant is The dry basis is 0.75, the sodium oxide content is less than 0.8% by weight) and 0.45kg ZSM-5 molecular sieve (purchased from Sinopec Catalyst Changling Branch, the silicon-aluminum molar ratio is 50, the dry basis is 0.91, and the sodium oxide content is less than 0.05% by weight ), then add 10kg of water and mix for beating for 5 minutes, then filter the slurry with a belt filter to obtain a wet filter cake SLBY-1. It was determined that the i value of the wet filter cake SLBY-1 ...

Embodiment 2

[0256] (1) Mix 5 kg of wet filter cake numbered SLBY-1 with 500 g of deionized water for beating for 1 minute, then send the resulting slurry into a plate and frame filter press, adjust the pressure of the plate and frame to 0.7 MPa and maintain After 15 minutes, a wet filter cake (coded as LBY-1) was obtained. It has been determined that the i value of the wet filter cake numbered LBY-1 is 67%.

[0257] (2) 300g of wet filter cake numbered LBY-1 is placed in a beaker, and 4.2g of hydroxyethyl methylcellulose (purchased from Shanghai Huiguang Fine Chemical Co., Ltd., the same below) and 2.3g of scallop powder ( The content of galactomannan is 85% by weight (purchased from Beijing Chemical Reagent Company). After stirring for 10 minutes with a mechanical stirrer, the hydrated alumina composition of the present invention is obtained, and its properties are listed in Table 1.

[0258] (3) Extrude the hydrated alumina composition prepared in step (2) on an F-26 twin-screw extrude...

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Abstract

The invention discloses a molecular sieve-containing hydrated alumina composition and a preparation method thereof, and a molded hydrated alumina material and a preparation method and application thereof. The composition contains hydrated alumina, a Y-type molecular sieve, a ZSM-type molecular sieve and a compound having at least two proton acceptor sites, and the Phi value of the composition is 5or below. The invention also discloses a catalyst using the molded hydrated alumina material formed by the hydrated alumina composition as a carrier and having hydrogenation catalysis effect, and a preparation method thereof, and a hydrocracking method. According to the invention, wet hydrated alumina gel is used as a starting raw material for preparation of the molded hydrated alumina material with high strength, and the step of drying of the wet hydrated alumina gel is omitted, so the overall process flow is simplified, overall energy consumption in operation is lowered, dust pollution caused by usage of dry pseudo-boehmite glue powder as a raw material is avoided, and an operation environment is greatly improved. When the molded hydrated alumina material formed by the hydrated aluminacomposition is used as the carrier for the catalyst, the catalyst presents higher catalytic activity.

Description

technical field [0001] The present invention relates to the technical field of alumina forming, in particular, the present invention relates to a hydrated alumina composition containing molecular sieves and a preparation method thereof, and the present invention also relates to a hydrated alumina formed body and a hydrated alumina formed from the hydrated alumina composition. Alumina molded body, the present invention further relates to a catalyst with hydrogenation catalysis using the molded body formed from the hydrated alumina composition as a carrier, a preparation method thereof, and a hydrocracking method using the catalyst. Background technique [0002] In the traditional method, the alumina formed body containing Y-type molecular sieve and ZSM-type molecular sieve, especially the γ-alumina formed body containing Y-type molecular sieve and ZSM-type molecular sieve, has a good pore structure and a suitable ratio Surface and high heat resistance stability, often used as...

Claims

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Application Information

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IPC IPC(8): B01J29/80B01J31/26B01J31/34B01J32/00B01J35/10B01J20/18C10G47/10C10G47/20
CPCB01J20/08B01J20/18C10G47/10C10G47/20B01J29/80B01J31/26B01J31/34B01J29/166B01J29/48B01J2229/18B01J35/647
Inventor 辛靖杨清河杨平王轶凡李明丰聂红胡志海董松涛张毓莹
Owner CHINA PETROLEUM & CHEM CORP
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