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Method for preparing in situ crystallization type catalytic cracking catalyst

An in-situ crystallization and catalytic cracking technology, which is applied in the direction of catalyst activation/preparation, physical/chemical process catalysts, molecular sieve catalysts, etc., can solve the problems of long crystallization time and the influence of crystallization quality stability, and achieve crystallization time Short, reduce the amount of directing agent, shorten the effect of crystallization time

Active Publication Date: 2009-09-23
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with the synthesis of NaY molecular sieves by the gel method, the in-situ crystallization process has one more step from the solid phase to the liquid phase, resulting in a longer crystallization time; Many conditions are restricted, which also affects the stability of crystallization quality

Method used

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  • Method for preparing in situ crystallization type catalytic cracking catalyst
  • Method for preparing in situ crystallization type catalytic cracking catalyst
  • Method for preparing in situ crystallization type catalytic cracking catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Add water to 20Kg (dry basis) of kaolin to make a slurry with a solid content of 35%, and add a total of 3% of additives such as sodium pyrophosphate and sodium hydroxide, and spray to obtain 15Kg of spray soil balls. The sprayed soil balls were roasted in a muffle furnace at 980°C for 2 hours to obtain roasted soil balls A1 and at 750°C for 3.5 hours to obtain roasted soil balls B1. Sodium silicate (containing 19.84% SiO 2 , 6.98% Na 2 (0) 750g, the mother liquor (8.04% SiO ) from the gel method NaY synthesis (using the method of Example 3 in US3639099) 2 , 0.67% Al 2 o 3 , 4.29% Na 2 O=60:5:32) 300g, sodium hydroxide 11.2g, directing agent (containing 11.65% SiO 2 , 1.32% Al 2 o 3 , 12.89% Na 2 O) 96g, deionized water 200g, 260gA1, 140gB1 were put into a stainless steel reactor, heated to 90°C and crystallized at constant temperature for 20 hours. After the crystallization is completed, the mother liquor is removed by filtration, and the filter cake is washed...

Embodiment 2

[0055] Add water to 18Kg (dry basis) kaolin to make a slurry with a solid content of 35%, and add 5% sodium silicate as an auxiliary agent, and spray to obtain 12Kg of spray soil balls. The sprayed soil balls were roasted in a muffle furnace at 1060° C. for 1 hour to obtain roasted soil balls A2, and roasted at 850° C. for 3 hours to obtain roasted soil balls B2. Sodium silicate (containing 19.84% SiO 2 , 6.98% Na 2 (0) 550g, the mother liquor that adopts 975g to obtain by the embodiment 3 method in US3639099 and 40.2g aluminum sulfate 75 ℃ reacted 5 hours to form the silica-alumina structural unit component of silica-alumina colloid (10.62% SiO 2 , 2.51% Al 2 o 3 , 3.86% Na 2 O=55:13:20) 738g, sodium hydroxide 28g, directing agent (containing 11.65% SiO 2 , 1.32% Al 2 o 3 , 12.89% Na 2 O) 180g, 40g of deionized water, 360g of A2, and 110g of B2 were put into a stainless steel reactor, the temperature was raised to 86° C. and crystallized at a constant temperature for ...

Embodiment 3

[0057] Add water to 25Kg (dry basis) kaolin to make a slurry with a solid content of 35%, and add 1% sodium hydroxide as an auxiliary agent, and spray to obtain 22Kg of spray soil balls. The sprayed soil balls were roasted in a muffle furnace at 900°C for 3.5 hours to obtain roasted soil balls A3, and at 870°C for 1.5 hours to obtain roasted soil balls B3. Sodium silicate (containing 19.84% SiO 2 , 6.98% Na 2 O) 1500g, from the mother liquor (13.69% SiO 2 , 0.56% Al 2 o 3 , 3.73% Na 2 O=73:3:20) 330g, sodium hydroxide 12.6g, directing agent (containing 11.65% SiO 2 , 1.32% Al 2 o 3 , 12.89% Na 2 O) 210g, 70g A3, and 280g B3 were put into a stainless steel reactor, the temperature was raised to 93° C. and crystallized at constant temperature for 18 hours. After the crystallization, the filter cake was filtered, washed and dried to obtain the crystallized product MC-3, which contained 32% Y-type zeolite, and the silicon-aluminum ratio (molar ratio) of the zeolite was 4....

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Abstract

The invention provides a method for preparing an in situ crystallization type catalyst by adding components with a silicon-aluminum structure unit in a certain proportion. The method is characterized in that: kaoline with meso position grain diameter used as a raw material is added with water to form a pulp, the pulp undergoes spray forming to form an earth ball, and the earth ball is roasted to form a roasted earth ball. The roasted earth ball undergoes the crystallized reaction with sodium silicate, the components with the silicon-aluminum structure unit, a guiding agent and the like to from a crystallized product of which the content of NaY zeolite is between 15 and 60 percent and the silicon-aluminum ratio is 3.5-5.5; and the crystallized product is exchanged and roasted to obtain the catalyst needed. Because the components with the silicon-aluminum structure unit are used as sources of partial silicon, aluminum and sodium, the method has the advantages of realizing the preparation of the in situ crystallization type molecular sieve in a short period of time, further shortening flow, improving yield and lowering production cost.

Description

technical field [0001] The invention relates to a method for preparing an in-situ crystallization type catalytic cracking catalyst by using kaolin as a main raw material. Background technique [0002] FCC catalysts can be divided into two types: in-situ crystallization type and semi-synthetic type according to different catalyst preparation processes. The semi-synthetic catalyst is to mix the active component (such as Y-type molecular sieve) and the matrix (such as kaolin), add a binder, spray to obtain microspheres of 20-140 μm, and then undergo a series of post-treatments to obtain the finished catalyst. In the 1970s, Engelhard Corporation of the United States proposed an in-situ crystallization technology that used kaolin as a raw material to simultaneously prepare active components and substrates. The prepared catalyst was called all-clay type or in-situ crystallization type catalyst. Good performance, activity and hydrothermal stability, low wear index. [0003] Domes...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/08B01J37/28
Inventor 张莉王宝杰刘宏海庞新梅刘超伟赵红娟石晓庆赵晓争张爱萍周卫军
Owner PETROCHINA CO LTD
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