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Catalytic cracking catalyst and preparation method thereof

A catalytic cracking and catalyst technology, applied in catalytic cracking, physical/chemical process catalysts, molecular sieve catalysts, etc., can solve the problems of low selectivity and limited effect of low-carbon olefins, achieve rich mesopores, reduce coking deactivation, Effect of suppressing surface non-selective side reactions

Active Publication Date: 2019-09-24
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] Existing methods have limited effect on maintaining good shape selectivity after ZSM-5 molecular sieve is expanded, and the selectivity of low-carbon olefins in cracking catalysts is not high.

Method used

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  • Catalytic cracking catalyst and preparation method thereof
  • Catalytic cracking catalyst and preparation method thereof

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preparation example Construction

[0047] In the catalytic cracking catalyst preparation method provided by the present invention, the preparation method of the phosphorus-containing MFI structure molecular sieve comprises: a, carrying out desiliconization treatment on the sodium type MFI structure molecular sieve in an alkaline solution to obtain a desiliconization molecular sieve; b, step The desiliconized molecular sieve obtained in a is subjected to ammonium exchange to obtain an ammonium-exchanged molecular sieve; wherein, the sodium content of the ammonium-exchanged molecular sieve is less than 0.2% by weight in terms of sodium oxide and based on the total dry weight of the ammonium-exchanged molecular sieve; c. The ammonium-exchanged molecular sieve obtained in step b is dealuminated in a complex acid dealumination agent solution composed of fluosilicic acid, organic acid and inorganic acid, and after filtering and washing, the dealuminated molecular sieve is obtained; d. After the obtained dealuminated m...

preparation Embodiment 1

[0077] Crystallized ZSM-5 molecular sieve (produced by Catalyst Qilu Branch Company, synthesized without amine method, n(SiO 2 ) / n(Al 2 o 3 )=27) filter out mother liquor, wash with water to Na 2 O content is lower than 3.0% by weight, filter to obtain filter cake; Take above-mentioned molecular sieve 100g (dry basis) and add in 1000g 2.0% NaOH solution, heat up to 65 ℃, after reacting for 30min, after rapidly cooling to room temperature, filter, wash to filtrate neutral. Then, add 800g water to the filter cake to make a slurry, add 40g NH 4 Cl, heated to 75°C, exchanged for 1h, to Na 2 O content is lower than 0.2% by weight, filters, washes, obtains molecular sieve filter cake; Get above-mentioned molecular sieve 50g (dry basis) and add water and be mixed with the molecular sieve slurry of solid content 10% by weight, add oxalic acid 4g in stirring, then 45g hydrochloric acid (mass fraction 10%) and 30g of fluosilicic acid (mass fraction 3%) were added in parallel, and t...

preparation Embodiment 2

[0097] Crystallized ZSM-5 molecular sieve (produced by Catalyst Qilu Branch Company, synthesized without amine method, n(SiO 2 ) / n(Al 2 o 3 )=27) filter out mother liquor, wash with water to Na 2 O content is lower than 3.0% by weight, filter to obtain filter cake; Get above-mentioned molecular sieve 100g (dry basis) and add in 1500g 2.3% NaOH solution, heat up to 60 ℃, after reacting for 45min, after rapidly cooling to room temperature, filter, wash to filtrate neutral. Then, add 800g water to the filter cake to make a slurry, add 40g NH 4 Cl, heated to 75°C, exchanged for 1h, to Na 2 O content is lower than 0.2% by weight, filters, washes, obtains molecular sieve filter cake; Get above-mentioned molecular sieve 50g (dry basis) and add water and be mixed with the molecular sieve slurry of solid content 10% by weight, add citric acid 4g in stirring, then 10g sulfuric acid (mass fraction 10%) and 45g of fluosilicic acid (mass fraction 3%) were added in parallel, and the ad...

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Abstract

The invention provides a catalytic cracking catalyst and a preparation method thereof, wherein the catalyst comprises 15-65% of natural minerals, 10-60% of an oxide, and 25-75% of a Y type molecular sieve and a phosphorus-containing IMF-structure molecular sieve, wherein the n(SiO2) / n(Al2O3) of the phosphorus-containing IMF-structure molecular sieve is more than 18 and less than 70, the phosphoruscontent is 1-15 wt%, the Al distribution parameter D is more than or equal to 0.6 and is less than or equal to 0.85, the volume of the mesopores accounts for 40-70% of the total pore volume, the volume of the mesopores with the pore size of 2-20 nm accounts for more than 85% of the total mesopore volume, the amount of the strong acid accounts for 45-75% of the total acid amount, and a ratio of the acid B to the acid L is 8-30. According to the present invention, the catalytic cracking catalyst has high low-carbon olefin yield and high BTX yield in the catalytic cracking of petroleum hydrocarbons.

Description

technical field [0001] The invention relates to a catalytic cracking catalyst and a preparation method thereof Background technique [0002] For a long time, ethylene, propylene and butene have been the basic organic chemical raw materials for synthetic resin, synthetic fiber and synthetic rubber, among which propylene is an important raw material for the manufacture of petrochemical products after ethylene. At present, the largest source of propylene at home and abroad is the main by-product of thermal cracking to produce ethylene. Liquid-based ethylene plants usually produce about 15% of propylene, providing about 70% of the propylene consumed by the petrochemical industry, while the second largest source of propylene is almost all from FCC units, providing about 30% of demand, In the United States, FCC units provide about half of petrochemicals' propylene demand. [0003] Due to the rapidly growing demand for polypropylene, the demand for propylene in the petrochemical ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/85C10G11/05C07C4/06C07C11/06
Inventor 刘宇键周翔田辉平刘俊王丽霞张杰潇
Owner CHINA PETROLEUM & CHEM CORP
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