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Olefin cracking catalyst, preparation method thereof and olefin cracking method

A technology for cracking catalysts and olefins, which is applied in the fields of hydrocarbon cracking to produce hydrocarbons, molecular sieve catalysts, chemical instruments and methods, etc., can solve the problems of high process cost, unfavorable catalyst regeneration, low ethylene selectivity, etc., and achieves high yield and cracking process. cost reduction effect

Pending Publication Date: 2020-08-04
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] Aiming at the shortcomings of existing olefin cracking catalysts, the present invention provides an olefin cracking catalyst and a preparation method thereof. The prepared catalyst can be used for catalytic cracking of light olefins, especially olefins in catalytic or coker gasoline fractions, and can solve the problem of The catalysts used in the prior art have the problems of low selectivity of ethylene and propylene and short catalyst life
[0011] The present invention also provides a method for catalytic cracking of olefins, using the catalyst of the present invention, which solves the problems in the prior art that fluidized bed is required for catalytic cracking, which is not conducive to catalyst regeneration and high process cost

Method used

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  • Olefin cracking catalyst, preparation method thereof and olefin cracking method
  • Olefin cracking catalyst, preparation method thereof and olefin cracking method
  • Olefin cracking catalyst, preparation method thereof and olefin cracking method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] (1) HZSM-5 molecular sieve treated by cation exchange and SAPO-34 molecular sieve treated by acid

[0059] The HZSM-5 molecular sieve was added to 0.1 mol / L NaOH solution, so that the mass ratio of HZSM-5 molecular sieve:NaOH solution was 1:6, and the mixed slurry of cation exchange treatment was obtained. The cation exchange treatment mixture was heated to about 90° C. in a water bath, maintained at this temperature for about 2 hours, and the HZSM-5 molecular sieve filter cake was filtered off with suction and washed until neutral. The obtained molecular sieve filter cake was dried in an oven at 120° C. for 4 hours, and then placed in a muffle furnace for calcination at 540° C. for 4 hours to obtain a cation exchange-treated HZSM-5 molecular sieve.

[0060] Add SAPO-34 molecular sieve to 0.06mol / L HNO 3 In solution, SAPO-34 molecular sieve: HNO 3 The mass ratio of the solution is 1:6 to obtain an acid-treated mixture. The acid treatment mixture was heated to about 9...

Embodiment 2

[0080] The catalyst was prepared according to the same procedure as in Example 1, except that the types of molecular sieves were different:

[0081] The SAPO-34 molecular sieve was replaced with β molecular sieve, and the method for cation exchange treatment of β molecular sieve and HZSM-5 molecular sieve was the same as that in Example 1, and the HZSM-5 and β molecular sieve after cation exchange treatment were mixed with a mass ratio of 3:1 to obtain HZSM -5 / β composite molecular sieve.

[0082] Other operations were the same as in Example 1, and catalyst B was prepared.

[0083] The catalytic effect evaluation experiment of catalyst B is the same as the catalytic cracking of catalytic cracking C4-C5 gasoline fraction in Example 1, and the results are shown in Table 1.

Embodiment 3

[0085] The catalyst was prepared according to the same procedure as in Example 1, except that the types of molecular sieves were different:

[0086] The molecular sieve is added with USY molecular sieve, and the cation exchange treatment process is the same as the cation exchange treatment process of HZSM-5 molecular sieve in Example 1. Proportions are mixed to obtain HZSM-5 / USY / SAPO-34 composite molecular sieve, other operations are the same as in Example 1, and catalyst C is prepared.

[0087] Taking catalytic cracking C4-C5 gasoline fractions as raw materials, the catalytic effect evaluation experiment of catalyst C is the same as that in Example 1, and the results are shown in Table 1.

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Abstract

The invention provides an olefin cracking catalyst, a preparation method thereof and an olefin cracking method. The preparation method of the catalyst comprises the following steps: mixing at least two of pretreated SAPO-34, ZSM-5, beta and USY molecular sieves according to a mass ratio of 0-30:50-80:0-30:0-50 to obtain a composite molecular sieve, and preparing the composite molecular sieve at least comprising two molecular sieves, wherein the pretreatment being as follows: the ZSM-5 molecular sieve, the beta molecular sieve and the USY molecular sieve are respectively subjected to cation exchange treatment; and sequentially carrying out nonmetal and metal modification on the composite molecular sieve, mixing with a matrix and a binder, and pulping to obtain the olefin cracking catalyst.The catalyst provided by the invention uses the composite molecular sieve with a multi-pore structure, is subjected to multiple modification treatment, has an appropriate pore structure and acid distribution, realizes regulation and control of an olefin cracking reaction path, improves the olefin conversion rate and the yields of ethylene and propylene, and also prolongs the service life of the catalyst.

Description

technical field [0001] The invention relates to petrochemical technology, in particular to a preparation method of an olefin cracking catalyst, a catalyst prepared by the method, and an olefin cracking method implemented by the catalyst. Background technique [0002] Ethylene is the basic organic raw material for petrochemicals, and about 75% of petrochemicals are produced from ethylene. In terms of synthetic materials, it is widely used in the production of polyethylene, vinyl chloride and polyvinyl chloride; in terms of organic synthesis, it is widely used in the synthesis of various basic organic synthesis raw materials such as ethanol, ethylene oxide and ethylene glycol. In fact, ethylene production has become a symbol to measure the development level of a country's petrochemical industry. [0003] Propylene is an important organic petrochemical basic raw material second only to ethylene. It is mainly used for the production of polypropylene, phenol, acetone, etc. Other...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/80B01J29/85B01J35/10C07C4/06C07C11/04C07C11/06
CPCB01J29/005B01J29/80C07C4/06B01J29/40B01J29/85B01J29/7007B01J29/084B01J2229/37B01J2229/38B01J2229/18B01J29/48B01J29/7815B01J29/166B01J35/60B01J35/613B01J35/615C07C11/04C07C11/06Y02P20/52
Inventor 赵亮孙海玲高金森张宇豪张彬瑞郝天臻孟庆飞李德忠徐春明
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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