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Method for preparing dual-molecular-sieve-containing cracking catalyst by using in-situ crystallization

A cracking catalyst and bimolecular sieve technology, which is applied in molecular sieve catalysts, physical/chemical process catalysts, catalytic cracking, etc., can solve the problems that the preparation of in-situ crystallization has not been published, and the pellet catalyst cannot meet the requirements of fluidized operation, etc. , to achieve the effect of rich catalyst pores and strong conversion ability of heavy oil

Active Publication Date: 2013-01-23
REZEL CATALYSTS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the method disclosed in this technology to prepare small ball catalysts with a particle size of several millimeters can only be used in fixed-bed reactors. It does not disclose that this method can perform in-situ crystallization on kaolin microspheres with a particle size of tens of microns formed by spraying. The prepared pellet catalyst cannot meet the requirements of catalyst fluidization operation in catalytic cracking unit

Method used

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  • Method for preparing dual-molecular-sieve-containing cracking catalyst by using in-situ crystallization

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] With 80 grams of NaZSM-5 molecular sieve (industrial product, Leshan Runhe Catalytic New Material Co., Ltd., silicon-aluminum ratio 30), 80 grams of NaY molecular sieve (same as above, silicon-aluminum ratio 5.0, crystallinity 90%), 800 grams of kaolin and 3 liters of water Add to beating in the gel-forming kettle for 30 minutes, add 400 milliliters of silica sol (same as above, SiO 2 25% by weight) after continuing beating for 30 minutes, use a high-shear mixing emulsifier (MBE-100L type, manufactured by Shanghai Environmental Protection Equipment General Factory) beating and homogenizing after 30 minutes in the laboratory with a small spray dryer (LPG-5 type, Changzhou Jianda Drying Equipment Co., Ltd.) is made into the microsphere of embodiment 1, and its average particle diameter is 65 microns.

[0030] Roast the microspheres at 200° C. for 2 hours to dehydrate in a calciner system with an air pump at a pressure of 0.05 MPa, then turn off the air pump and open the ...

Embodiment 2

[0037] Add 40 grams of HZSM-5 molecular sieve (same as above, silicon-aluminum ratio of 50), 40 grams of HY molecular sieve (same as above, silicon-aluminum ratio of 6.5, crystallinity 80%), 850 grams of kaolin and 3 liters of water into the gelling kettle for beating for 30 minutes, Add 200 ml aluminum sol (same as above, SiO 2 20% by weight), 150 grams of pseudo-boehmite (industrial product, Shanxi Aluminum Plant of Aluminum Corporation of China, solid content 65% by weight) and 25 milliliters of hydrochloric acid (chemically pure, Beijing Chemical Reagent Company, 33% by weight) continue beating for 40 Minutes later, beating and homogenizing with a high-shear mixing emulsifier (same as above) after 30 minutes, the microspheres of embodiment 2 were made on a small spray dryer (same as above) in the laboratory, and its average particle diameter was 62 microns.

[0038] Roast the microspheres at 300° C. for 1 hour to dehydrate in a roasting furnace system with an air pump at ...

Embodiment 3

[0043] 40 g NH 4 ZSM-5 molecular sieve (the same, silicon-aluminum ratio 50) and 40 grams of rare earth ZSM-5 molecular sieve (the same, silicon-aluminum ratio 30, rare earth oxide 2.0% by weight), 40 grams of NH 4 Y molecular sieve (same as above, silicon-aluminum ratio 5.0, crystallinity 90%), 40 grams of rare earth USY molecular sieve (same as above, 2.0 weight percent of rare earth oxide), 850 grams of kaolin and 3 liters of water are added to the gelling kettle for beating for 30 minutes, and 400 ml Sodium silicate (same as above) continues beating after 40 minutes, with high-shear mixing emulsifying machine (same as above) beating homogeneously after 30 minutes, the microsphere of embodiment 3 is made on the small-sized spray drier (same as above) in laboratory, its The average particle diameter is 64 microns.

[0044] Roast the microspheres at 350° C. for 1 hour to dehydrate in a calciner system with an air pump at a pressure of 0.06 MPa, then turn off the air pump and...

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Abstract

A method for preparing dual-molecular-sieve-containing cracking catalyst by using in-situ crystallization is characterized by mixing 1 to 10 % by weight of a ZSM-5, 1 to 10 % of by weight of a Y molecular sieve, 1 to 15 % by weight of a binder and the balance being kaolin, pulping and atomizing to prepare microballoons with an average particle size of 50 to 80 microns; vacuum calcinating and dehydrating under 0.01 to 0.1 MPa and 150 to 500 DEG C for 0.5 to 4 hours, and calcinating under 500 to 900 DEG C for 1 to 10 hours, adding a sodium silicate solution with a solid / liquid ratio of 1 : 1-5; adjusting a pH value of the slurry to 12-14 with a sodium hydroxide solution; hydrothermally crystallizing 20 to 60 % by weight of a NaY molecular sieve with a silica-alumina ratio of 4.5 to 5.8 respectively under 50 to 100 DEG C for 0.5 to hours and under 80 to 130 DEG C for 15 to 40 hours; and hydrothermally exchanging for 1 to 3 times with a rare earth salt solution and an ammonium salt solution and calcinating under 400 to 750 DEG C for 1 to 4 hours for 1 to 2 times to prepare a catalyst with less than or equal to 1.0 % by weight of Na2O and 2 to 12 % by weight of rare earth oxide, wherein the catalyst contains the ZSM-5 molecular sieve and the Y molecular sieve, and has advantages of strong conversion capability of heavy oil, large liquid yield and high octane number of gasoline.

Description

technical field [0001] The invention relates to a method for preparing a catalyst for catalytic conversion of petroleum hydrocarbons, in particular to a method for preparing a bimolecular sieve-containing cracking catalyst by in-situ crystallization, and belongs to the field of petrochemical catalysts. Background technique [0002] As early as the 1960s, Heden et al. from Enghard Mineral Chemical Company of the United States first disclosed in USP3391994 the NaY in-situ crystallization technology in which kaolin was used as a matrix to prepare active components and matrix symbiosis, and developed in-situ crystallization to produce Y molecular sieves. catalyst method. The process is to first spray kaolin slurry into microspheres suitable for fluid catalytic cracking units, and after roasting, convert a part of the microspheres into NaY molecular sieves in an alkaline system, and then modify them. Prepared as catalytic cracking catalyst, USP3503900 and so on. Compared with t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/80C10G11/05
Inventor 卓润生
Owner REZEL CATALYSTS CORP
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