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Process for preparing cracking catalyst for hydrocarbons containing molecular sieves

A technology for cracking catalysts and molecular sieve hydrocarbons, which is applied in the field of preparation of hydrocarbon cracking catalysts. It can solve the problems of poor catalyst selectivity, small catalyst pore size and pore volume, and achieve low coke selectivity, large pore size and pore volume, and high Effect of light oil selectivity

Active Publication Date: 2005-11-02
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to provide a kind of pore size and pore volume bigger, selectivity better containing molecular sieve for the catalyst pore diameter and pore volume prepared by above-mentioned existing cracking catalyst preparation method are too small, the shortcoming of catalyst selectivity is bad. Preparation method of hydrocarbon cracking catalyst

Method used

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Examples

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preparation example Construction

[0010] According to the preparation method of the catalyst provided by the present invention, the hydrated alumina can be all the modified hydrated alumina, or a mixture of modified hydrated alumina and conventional unmodified hydrated alumina. The modified alumina hydrate is used in an amount such that the alumina provided by the modified alumina hydrate accounts for at least 5% by weight, preferably at least 20% by weight, of the total amount of alumina provided by the alumina hydrate.

[0011] The hydrated alumina is selected from one or more of the hydrated aluminas commonly used in cracking catalysts, such as pseudoboehmite (Pseudoboemite) structure, monohydrate (Boehmite) structure, gibbsite (Gibbsite) ) structure and Bayerite (Bayerite) structure of the hydrated alumina in one or more. Alumina hydrate having a pseudoboehmite structure and / or alumina hydrate having a gibbsite structure are preferred.

[0012] The modified hydrated alumina is hydrated alumina calcined at...

example 1

[0028] This example illustrates modified alumina and its preparation.

[0029] Weighed 6 kilograms of pseudoboehmite (produced by Shandong Aluminum Plant, with an alumina content of 62% by weight), roasted at 200°C for 5 hours, 300°C for 3 hours and 380°C for 1.5 hours, and cooled to obtain modified pseudo-boehmite. Boehmite A1, A2 and A3. Mix modified pseudo-boehmite A1, A2 and A3 with deionized water respectively, and grind for 1 hour to obtain a slurry containing modified pseudo-boehmite A1, A2 and A3, the content of alumina in the slurry is 20 weight%.

example 2

[0031] This example illustrates modified alumina and its preparation.

[0032] Weighed 6 kg of gibbsite (produced by Shandong Aluminum Works, with an alumina content of 64% by weight) and roasted at 300° C. for 2 hours, and cooled to obtain modified gibbsite A4. The modified gibbsite A4 was mixed with water and ground for 1.5 hours to obtain a slurry containing the modified gibbsite A4, and the content of alumina in the slurry was 30% by weight.

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Abstract

A method for preparation of olefin-cracking molecular sieve catalyst contains the following steps: mixing equably aluminium sol, hydrated alumina, clay, acid, molecular sieve with water to prepare a serous fluid of a solid content of 25-45 weight percent, then drying, said hydrated alumina containing a modified hydrated alumina, which is prepared by coasting hydrated alumina in 150-400 Deg. C for at least 10 minutes, and provides alumina at least 5 weigh percent to total amount provided by hydrated alumina. Cracking catalyst prepared in such way has big hole diameter and hole bulk, and thus has high light oil selectivity and low coke selectivity.

Description

technical field [0001] The present invention relates to a preparation method of a hydrocarbon cracking catalyst, more specifically, a preparation method of a hydrocarbon cracking catalyst containing molecular sieves. Background technique [0002] In recent years, the heavy tendency of catalytic cracking raw materials has become increasingly serious, and macromolecular substances such as colloids and asphaltenes in raw materials have relatively large molecular diameters. When the catalyst lacks medium and large pores, these macromolecular substances are not only difficult to convert into light oil, but also easily generate coke and dry gas on the surface of the catalyst, resulting in poor selectivity of the catalyst, that is, the selectivity of coke is high. Light oils, i.e. diesel and gasoline, are less selective. Therefore, increasing the pore size and pore volume of the cracking catalyst matrix is ​​an important means to improve the performance of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G11/05
Inventor 严加松龙军田辉平周灵萍王振波许明德张万虹
Owner CHINA PETROLEUM & CHEM CORP
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