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Catalytic cracking prolific propylene catalyst and preparation method thereof

A catalytic cracking and catalyst technology, used in catalytic cracking, physical/chemical process catalysts, molecular sieve catalysts, etc., can solve the problems of unstable molecular sieve structure and deactivation, and achieve good hydrothermal stability, high propylene yield and propylene selective effect

Pending Publication Date: 2022-03-25
SHANDONG JINGBO PETROCHEM
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The propylene catalyst used in catalytic cracking can greatly increase the output of propylene, and the main role is the hydrogen ZSM-5 molecular sieve; however, the molecular sieve structure is unstable and easily deactivated under the hydrothermal conditions of catalytic cracking

Method used

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

Examples

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preparation example Construction

[0023] The present invention provides a kind of preparation method of catalytic cracking prolific propylene catalyst, comprises the following steps:

[0024] a) performing phosphorus modification and metal modification on the hydrogen ZSM-5 molecular sieve in turn to obtain a modified molecular sieve;

[0025] b) mixing the binder with water to obtain a precursor slurry, and then sequentially adding kaolin, pseudo-boehmite, hydrochloric acid and the modified molecular sieve obtained in step a) under stirring conditions to obtain a propylene catalyst mother liquor;

[0026] c) shaping the propylene catalyst mother liquor obtained in step b) and then roasting to obtain a catalytic cracking catalyst that can produce more propylene.

[0027] In the invention, firstly, the hydrogen type ZSM-5 molecular sieve is modified by phosphorus and metal in order to obtain the modified molecular sieve. In the present invention, the particle size of the hydrogen-type ZSM-5 molecular sieve is ...

Embodiment 1

[0054] (1) Weigh 200g of aluminum sol and dissolve it in 900g of deionized water with stirring to obtain mixed solution A.

[0055] (2) Weigh 195g of kaolin and dissolve it in mixed solution A under stirring condition, and stir at 400r / min for 1h to obtain mixed solution B.

[0056] (3) Weigh 70 g of pseudo-boehmite and add it into the mixed solution B, and stir at 400 r / min for 0.5 h to obtain the mixed solution C.

[0057] (4) Add 14 g of hydrochloric acid with a concentration of 37 wt% to the mixed solution C, stir at 400 r / min for 1 hour, and obtain the mixed solution D.

[0058] (5) Weigh 250g of zinc-phosphorus modified molecular sieve and add it into the mixed solution D, stir at 400r / min for 1.5h to obtain the propylene catalyst mother liquor; Concentration is 1wt% phosphoric acid solution (P 2 o 5 ), stirred evenly at room temperature, and roasted at 540°C for 3h after drying to obtain a phosphorus-modified molecular sieve; then impregnated the phosphorus-modified ...

Embodiment 2

[0061] Using the preparation method provided in Example 1, the difference is that: the cerium-phosphorus modified molecular sieve is used instead of the zinc-phosphorus modified molecular sieve to obtain a catalyst for catalytic cracking with high yield of propylene; the preparation method of the cerium-phosphorus modified molecular sieve is as follows: hydrogen type ZSM-5 molecular sieve Immersed in a phosphoric acid solution (P 2 o 5 ), stirred evenly at room temperature, and roasted at 540°C for 3h after drying to obtain a phosphorus-modified molecular sieve; then impregnated the phosphorus-modified molecular sieve in Ce(NO 3 ) 3 The solution was stirred evenly, dried and calcined at 540° C. for 3 hours to obtain cerium-phosphorus-modified molecular sieves.

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Abstract

The invention provides a catalytic cracking prolific propylene catalyst and a preparation method thereof. The preparation method comprises the following steps: a) sequentially carrying out phosphorus modification and metal modification on a hydrogen type ZSM-5 molecular sieve to obtain a modified molecular sieve; b) mixing a binder with water to obtain precursor slurry, and sequentially adding kaolin, pseudo-boehmite, hydrochloric acid and the modified molecular sieve obtained in the step a) under a stirring condition to obtain propylene catalyst mother liquor; and c) molding the propylene catalyst mother liquor obtained in the step b), and roasting to obtain the catalytic cracking productive propylene catalyst. Compared with the prior art, the preparation method provided by the invention has the advantages that the hydrogen type ZSM-5 molecular sieve is adopted as the raw material, modification treatment is carried out in cooperation with specific steps, the overall better interaction is realized, and the prepared catalytic cracking prolific propylene catalyst has higher propylene yield and propylene selectivity, and is good in hydrothermal stability; the catalyst can be better used in the field of petrochemical catalytic cracking.

Description

technical field [0001] The invention relates to the technical field of petroleum catalytic cracking, and more specifically relates to a catalytic cracking catalyst capable of producing propylene and a preparation method thereof. Background technique [0002] Propylene is an important chemical raw material. With the development of the national economy in recent years, the market demand for propylene is increasing day by day. At present, domestic propylene mainly comes from naphtha steam cracking and heavy oil catalytic cracking. Due to the heavy crude oil in my country, naphtha steam cracking is difficult to meet the growing demand for propylene. Compared with the steam cracking process, the production of propylene by catalytic cracking has the advantages of heavy raw material, high ratio of propylene to ethylene, and low production cost. The increase of propylene production by catalytic cracking has become a hot spot in the development of catalytic cracking technology. [0...

Claims

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Application Information

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IPC IPC(8): B01J29/40C10G11/05
CPCB01J29/405B01J29/40C10G11/05B01J2229/186
Inventor 陈春雨姜海英高天宇史会兵赵德明王耀伟栾波
Owner SHANDONG JINGBO PETROCHEM
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