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Catalyst for producing propylene by catalytic pyrolysis and preparation method thereof

A catalytic cracking and catalyst technology, applied in the direction of physical/chemical process catalysts, molecular sieve catalysts, bulk chemical production, etc., can solve the problems of less research on the optimization and utilization of olefins, achieve improved yield and selectivity, simple process flow, Highly stable effect

Active Publication Date: 2009-06-24
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Numerous patents focused on the catalytic C 4 ~C 6 Catalyst and method thereof for olefin cracking to generate propylene, but for C 6 ~C 12 There are few studies on the optimal utilization of olefins

Method used

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  • Catalyst for producing propylene by catalytic pyrolysis and preparation method thereof

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preparation example Construction

[0026] The preparation method of olefin catalytic cracking to produce propylene catalyst provided by the invention, the step of this method comprises:

[0027] 1) Roast the molecular sieve raw powder with a grain size of 10-100nm at 400-700°C to remove the template agent, exchange it in a solution containing ammonium ions for 1-4 times, each time for 2-4 hours, and the exchange temperature is 50 ~120°C, the concentration of ammonium ions in the solution is 0.5~2mol / L, after the exchange is completed, dry and then roast to obtain hydrogen molecular sieves;

[0028] 2) impregnating the hydrogen-type molecular sieve in a solution containing phosphorus and / or group IB metal ions, then drying and calcining at 400-700°C for 2-6 hours to obtain a modified molecular sieve;

[0029] 3) Mix the modified molecular sieve with heat-resistant inorganic oxide or its precursor and water evenly, shape it into the desired shape, dry it, and bake it at 400-800°C for 2-8 hours, preferably at 500-...

Embodiment 1

[0051] 1) The ZSM-23 molecular sieve raw powder with a particle size of 10-100nm was roasted at 550°C to remove the template agent, and then mixed with 1mol / L NH 4 NO 3 The solution was ion-exchanged twice at 100° C. for 4 hours each time, dried after the exchange, and calcined at 550° C. for 4 hours to obtain hydrogen-type molecular sieves.

[0052] 2) Put the hydrogen type ZSM-23 molecular sieve in a certain concentration of (NH) 2 HPO 4 Immersed in the solution, then dried, and roasted at 500° C. for 3 hours to obtain a P-modified molecular sieve; so that the content of P is 2.0% by weight based on the total weight of the molecular sieve;

[0053] 3) Mix the phosphorus-modified molecular sieve obtained in step 2, silica sol and appropriate amount of water according to the weight ratio of molecular sieve dry basis: silica sol=25:75, grind it evenly, extrude it, and obtain catalyst A1 after drying and roasting .

Embodiment 2

[0055] 1) The ZSM-5 molecular sieve raw powder with a particle size of 10-100nm was roasted at 600°C to remove the template agent, and then mixed with 1mol / L NH 4 NO 3 The solution was ion-exchanged twice at 100° C. for 4 hours each time, dried after the exchange, and calcined at 600° C. for 4 hours to obtain hydrogen-type molecular sieves.

[0056] 2) The hydrogen ZSM-5 molecular sieve was mixed with a certain concentration of AgNO 3 Immersed in the solution, then dried, and roasted at 550° C. for 2 hours to obtain an Ag-modified molecular sieve; so that the content of Ag is 2.2% by weight based on the total weight of the molecular sieve;

[0057] 3) Silver modified molecular sieve, pseudo-boehmite and an appropriate amount of water obtained in step 2 are mixed in a weight ratio of molecular sieve on a dry basis: pseudo-boehmite=40:60, and after being uniformly ground, it is extruded into strips, dried, Catalyst A2 was obtained after calcination.

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Abstract

The invention discloses a catalyst for producing propylene by catalytic pyrolysis and a preparation method thereof. Calculated as the total weight of the catalyst, the catalyst comprises 20 to 40 weight percent of element-modified molecular sieve and 60 to 80 weight percent of heat-resistant inorganic oxide, wherein the content of a modified element is between 1 and 10 weight percent calculated as the total weight of the molecular sieve, the average grain diameter of crystal grains of the molecular sieve is between 10 and 100nm, and the modified element is one or a mixture of more of family IB metals and / or phosphorus. The catalyst is used for reactions that low carbon olefin, particularly the propylene is produced by C6-C12 olefins through catalytic pyrolysis, and has higher conversion rate of the C6-C12 olefins and yield of the propylene.

Description

technical field [0001] The present invention relates to a catalyst for the catalytic conversion of olefins and a preparation method thereof, more specifically to a catalyst made of C 6 ~C 12 A catalyst for producing light olefins, especially propylene, by catalytic cracking of olefins and a preparation method thereof. Background technique [0002] Propylene is an important petrochemical basic raw material, mainly used in the production of polypropylene, acrylonitrile, propylene oxide, isopropanol, cumene and acrylic acid. With the rapid development of the national economy, the demand for propylene continues to increase, but the growth of propylene production capacity is limited, and the traditional method of increasing propylene production cannot meet the market demand. [0003] Hydrocarbon steam cracking process and catalytic cracking process are the two main sources of propylene. The steam cracking unit is mainly based on light raw materials. The output of propylene is ...

Claims

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Application Information

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IPC IPC(8): B01J29/80B01J29/40C07C11/06C07C4/06
CPCY02P20/52
Inventor 侯焕娣崔德春张书红王子军李锐李萍肖荣军包晓东
Owner CHINA PETROLEUM & CHEM CORP
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