Catalyst for olefin catalytic cracking to produce propylene and ethylene and application thereof

A catalytic cracking and catalyst technology, applied in the field of ethylene catalyst and catalytic cracking to produce propylene, can solve the problems of inability to operate for a long time, and achieve the effects of small crystal grains, high acid density and long service life

Inactive Publication Date: 2009-12-02
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] However, the olefin catalytic cracking catalysts in the prior art cannot operate for a long period of time while ensuring high propylene and ethylene yields. Therefore, in order to solve the above problems, a new catalyst for olefin catalytic cracking to produce propylene and ethylene is provided. and how to use it is extremely necessary

Method used

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  • Catalyst for olefin catalytic cracking to produce propylene and ethylene and application thereof
  • Catalyst for olefin catalytic cracking to produce propylene and ethylene and application thereof
  • Catalyst for olefin catalytic cracking to produce propylene and ethylene and application thereof

Examples

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preparation example Construction

[0059] The preparation method of H-type ZSM-5 molecular sieve:

[0060] After the ZSM-5 molecular sieve raw powder with the required silicon-aluminum ratio and particle size was roasted at 550°C to remove the template agent, the ratio of molecular sieve (g) to exchange solution (ml) was 1:10, and NH 4 NO 3 The solution (0.8mol / L) was exchanged in a 90°C water bath for 5 hours, and filtered; the filter cake was exchanged twice with the same amount of exchange liquid as before, filtered, and washed with distilled water until there was no NO in the filtrate. 3 - Existence, drying at 110°C, and calcining at 550°C to obtain HZSM-5 molecular sieve.

Embodiment 1

[0070] The raw powder of ZSM-5 molecular sieve (mole ratio of silicon to aluminum is 180, particle size is 400nm) is processed according to the above preparation method to obtain HZSM-5 molecular sieve. The HZSM-5 molecular sieve and silicon oxide (specific surface area > 200M2 / g of high-purity silica) and squat powder are mixed in proportion, after mixing, add an appropriate amount of dilute nitric acid, after mixing, extrude into a cylindrical shape with a diameter of 3mm, dry at 110°C and roast at 520°C to obtain a molecular sieve containing ZSM-5 and silicon oxide strips. Take a certain amount of cylindrical particles, impregnate the particles with a solution containing phosphoric acid at room temperature, filter and separate, dry at 110°C and bake at 500°C, and use a solution containing Ce(NO 3 ) 3 The solution impregnated the particles, filtered and separated, dried at 110°C and calcined at 520°C, impregnated with Ca and Ce, treated with water vapor at 500°C for 5 hour...

Embodiment 2

[0072] Treat the original powder of ZSM-5 molecular sieve (silicon-aluminum molar ratio is 80, particle size is 200nm) according to the above preparation method: change the roasting temperature of molecular sieve raw powder from 550°C to 450°C, change the exchange time from 5h to 3h, after exchange The roasting temperature of the filter cake was changed to 650°C, and other conditions remained unchanged to obtain HZSM-5 molecular sieve. The HZSM-5 molecular sieve and silicon oxide (specific surface area > 200M 2 / g of high-purity silica) and squat powder are mixed in proportion, after mixing, add an appropriate amount of dilute nitric acid, after mixing, extrude into a cylindrical shape with a diameter of 3mm, dry at 110°C and roast at 520°C to obtain a molecular sieve containing ZSM-5 and silicon oxide strips. Take a certain amount of cylindrical particles, impregnate the particles with a solution containing phosphoric acid at room temperature, filter and separate, dry at 110...

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Abstract

The invention provides a novel catalyst for olefin catalytic cracking to produce propylene and ethylene and a use method thereof. The catalyst comprises ZSM-5 molecular sieve in which the silicon aluminium mole ratio SiO2/Al2O3 is 10-300 and the grain size is 10-800nm, and phosphorus element and rare earth metal elements which are loaded on the molecular sieve; wherein, C4-C12 olefin is used as raw materials, the reaction temperature is 450-650 DEG C, the reaction pressure is 0-0.3Mpa, the weight hourly space velocity of olefin is 1-14h, the weight ratio of water to the olefin is 0.1-10; the raw materials are sent to catalyst bed to perform olefin catalytic cracking reaction to produce propylene and ethylene. By applying the catalyst provided by the invention, the high yield of propylene and ethylene can be maintained, while the reaction operating time can be longer, thus being applicable to the industrialized production.

Description

technical field [0001] The invention relates to a catalyst for producing propylene and ethylene by catalytic cracking and its application, in particular to a catalyst for producing propylene and ethylene by catalytic cracking of C4-C12 olefins and its application. Background technique [0002] According to statistics, the world's ethylene production capacity in 1995 was 79.32 million tons / year, and it is expected to be 110.38 million tons / year by 2010. With the increase of ethylene production, the output of carbon four and above carbon four olefins by-products of steam cracking continues to increase. Affected by changes in the chemical product market and transportation costs and other factors, it is a must to carry out in-situ deep processing of these low value-added materials. A better way to use it. At the same time, affected by the increase in demand for polypropylene and alkylaromatic compounds, the demand for propylene is growing vigorously. By 2008, the demand for pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/40C07C4/06C07C11/04C07C11/06
CPCY02P20/52
Inventor 白杰郝雪松刘小波王超陈硕
Owner CHINA PETROLEUM & CHEM CORP
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