Hydrated alumina composition and catalyst containing ZSM-12 type molecular sieve, preparation methods and hydroisomerization method

A ZSM-12, hydrated alumina technology, applied in molecular sieve catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of secondary dust pollution, difficult transfer, low production efficiency, etc., and reduce operating energy. The effect of reducing consumption and simplifying the process flow

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

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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 surface that is dried does not contain free water), while the interior remains wet (that is, for the interior that has not been dried, the content of free water basically remains 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 during molding, but because the dry basis (35%-50%) of the pseudo-boehmite it uses 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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  • Hydrated alumina composition and catalyst containing ZSM-12 type molecular sieve, preparation methods and hydroisomerization method
  • Hydrated alumina composition and catalyst containing ZSM-12 type molecular sieve, preparation methods and hydroisomerization method
  • Hydrated alumina composition and catalyst containing ZSM-12 type molecular sieve, preparation methods 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-12 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-12 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. Boehmite wet filter cake (the wet filter cake is coded as SLB-1), the i value of the wet filter cake is 80.2%.

[0239] (1) Add 5.48kg H-ZSM-12 molecular sieve (product of Sinopec Catalyst Branch Jianchang Branch Company, Si-Al ratio is 50, dry basis is 0.98) to 50kg wet filter cake SLB-1, then add 10kg water to mix Beat the pulp for 5 minutes, then filter the slurry with a belt filter to obtain 15.2kg of wet filter cake SLBZ-1. The i value of the wet filter cake SLBZ-1 was determined to be 80.2%; after the wet filter cake SLBZ-1 was roasted at 600°C for 3 hours, the weight ratio of alumina to ZSM-12 molecular sieve was determined to be 58:42.

[0240] (2) Put 200g of the wet filter cake numbered SLBZ-1 in a beaker, then add 5g of methylcellul...

Embodiment 2

[0251] (1) Mix 5kg of wet filter cake numbered SLBZ-1 with 500g of deionized water and beat for 1 minute, then send the obtained slurry into a plate and frame filter press, adjust the pressure of the plate and frame to 0.7MPa 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) Put 300g of the wet filter cake numbered LBZ-1 in a beaker, add 4.3g of hydroxyethyl methylcellulose (purchased from Shanghai Huiguang Fine Chemical Co., Ltd., the same below) and 1.7g of safflower powder ( The content of galactomannan is 85% by weight (purchased from Beijing Chemical Reagent Company), and 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 a F-26 twin-screw extruder wi...

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Abstract

The invention discloses a hydrated alumina composition containing a ZSM-12 molecular sieve and a preparation method thereof and a molded body and a preparation method and application thereof. The composition contains hydrated alumina, the ZSM-12 molecular sieve and a compound with at least two proton acceptor sites and with the value of phi of 5 or less. The present invention also discloses a hydroisomerization catalyst using the molded body prepared from the hydrated alumina composition as a carrier, a preparation method and a hydroisomerization method. The molded body with higher strength isprepared from hydrated alumina wet gel as a starting material, the step of drying of the hydrated alumina wet gel is omitted, the overall process flow is simplified, the overall operation energy consumption is reduced, dust pollution caused by use of pseudoboehmite dry powder as a raw material is avoided, and the working environment is greatly improved. The catalyst shows a higher catalytic activity in the hydroisomerization reaction.

Description

technical field [0001] The present invention relates to the technical field of alumina molding, in particular, the present invention relates to a hydrated alumina composition containing ZSM-12 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-12 molecular sieve was synthesized for the first time in 1974 by Rosinski et al., Mobil Company of the United States. ZSM-12 has a one-dimensional linear non-intersecting channel composed of twelve-membered rings, with a pore diameter of ZSM-12 belongs to the monoclinic crystal system (C2 / m), the structure type is MT...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/70B01J21/04B01J20/08C10G45/64
CPCB01J20/08B01J21/04B01J29/7034C10G45/64
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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