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Alumina hydrate composition and catalyst containing zsm-22 type molecular sieve, preparation method and hydroisomerization method

A technology of ZSM-22 and hydrated alumina, which is applied in the direction of molecular sieve catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve problems such as transfer difficulties, secondary dust pollution, and increased volume of unqualified products, and achieve simplification Process flow, the effect of reducing operating energy consumption

Active Publication Date: 2020-07-28
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

[0015] (1) Pseudo-boehmite that has not been completely dried has strong viscosity, is difficult to transfer, and easily causes secondary dust pollution;
[0016] (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;
[0017] (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;
[0018] (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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  • Alumina hydrate composition and catalyst containing zsm-22 type molecular sieve, preparation method and hydroisomerization method
  • Alumina hydrate composition and catalyst containing zsm-22 type molecular sieve, preparation method and hydroisomerization method
  • Alumina hydrate composition and catalyst containing zsm-22 type molecular sieve, preparation method and hydroisomerization method

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preparation example Construction

[0106] According to the preparation method of the hydrated alumina composition of the present invention, the raw material mixture contains hydrated alumina wet gel, ZSM-22 molecular sieve and a compound having at least two proton acceptor sites. The compound having at least two proton acceptor sites and its type, as well as the ZSM-22 molecular sieve and its type have been described in detail above, and will not be repeated here.

[0107] 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.

[0108] The precipitation method includes acid method and alkali method. The acid method is to carry out precipitation reaction of aluminum salt with basic compound. The alkali method...

Embodiment 1

[0238] 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 80.2%.

[0239] (1) Add 5.48kg H-ZSM-22 molecular sieve (product of Sinopec Catalyst Branch Company, silicon-aluminum ratio is 50, dry basis is 0.98) in 50kg wet filter cake SLB-1, then add 10kg water and mix beating for 5 minutes, Then the slurry was filtered with a belt filter to obtain 15.2kg of wet filter cake SLBZ-1. It was determined that the i value of the wet filter cake SLBZ-1 was 80.2%; after the wet filter cake SLBZ-1 was roasted at 600°C for 3 hours, it was determined that the weight ratio of alumina to ZSM-22 molecular sieve was 58:42 .

[0240] (2) Put 200g of wet filter cake numbered SLBZ-1 in a beak...

Embodiment 2

[0251] (1) Mix 5 kg of wet filter cake numbered SLBZ-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 LBZ-1) was obtained. It has been determined that the i value of the wet filter cake numbered LBZ-1 is 63%.

[0252] (2) 300g of wet filter cake numbered LBZ-1 was placed in a beaker, and 4.3g of hydroxyethyl methylcellulose (purchased from Shanghai Huiguang Fine Chemical Co., Ltd., the same below) and 1.7g 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.

[0253] (3) Extrude the hydrated alumina composition prepared in step (2) on an F-26 twin-screw extrud...

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Abstract

The invention discloses a hydrated alumina composition containing ZSM-22 molecular sieve and its preparation method, as well as a molded body and its preparation method and application. The composition contains hydrated alumina, ZSM-22 molecular sieve and at least two Compounds with proton acceptor sites and a value of 5 or less. The invention also discloses a hydroisomerization catalyst using a shaped body formed of the hydrated alumina composition as a carrier, a preparation method and a hydroisomerization method. The present invention uses hydrated alumina wet gel as the starting material to prepare a molded body with higher strength, omits the step of drying the hydrated alumina wet gel, simplifies the overall process flow, and reduces the overall operating energy consumption. Dust pollution caused by using pseudo-boehmite dry glue powder as raw material is avoided, which greatly improves the working environment. The catalyst according to the invention shows better catalytic activity in hydroisomerization reactions.

Description

technical field [0001] The present invention relates to the technical field of alumina forming, specifically, the present invention relates to a hydrated alumina composition containing ZSM-22 molecular sieve and its preparation method, and the present invention also relates to the hydrated alumina formed from the hydrated alumina composition. Aluminum molded body and alumina molded body, the present invention further relates to a hydroisomerization catalyst using the molded body formed from the hydrated alumina composition as a carrier, a preparation method thereof, and a hydroisomerization process using the catalyst method. Background technique [0002] ZSM-22 molecular sieve is a new type of aluminosilicate molecular sieve material developed in the 1980s by Dwyer et al. of Mobil Corporation of the United States. It belongs to the orthorhombic crystal system, the space group is Mmc21, and the unit cell parameter is a=13. ZSM-22 molecular sieve has a TON structural topolo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/70B01J20/28B01J20/18C10G49/08B01J20/30
CPCB01J20/08B01J20/18C10G49/08B01J20/28078B01J20/28083B01J20/2809B01J20/28092B01J29/70B01J35/64B01J35/67B01J35/69B01J35/647
Inventor 毕云飞夏国富杨清河李明丰辛靖黄卫国郭庆洲方文秀
Owner CHINA PETROLEUM & CHEM CORP
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