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Method for preparing catalytic cracking catalyst

A catalytic cracking and catalyst technology, applied in the direction of catalyst activation/preparation, physical/chemical process catalyst, molecular sieve catalyst, etc., can solve the problems of ammonia nitrogen pollution, waste of manpower and material resources, heavy economic burden, etc., to eliminate ammonia nitrogen pollution and reduce wastewater treatment Cost, effect of enhancing activity and stability

Active Publication Date: 2012-11-28
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

The waste liquid after molecular sieve exchange and catalyst washing is high-ammonia-nitrogen wastewater, which needs to be treated at a huge cost before it can be discharged. Otherwise, it will cause serious ammonia-nitrogen pollution to the environment
[0008] The treatment of high ammonia nitrogen wastewater not only brings a heavy economic burden to catalytic cracking catalyst manufacturers, but also wastes a lot of manpower and material resources

Method used

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  • Method for preparing catalytic cracking catalyst
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preparation example Construction

[0021] In the catalytic cracking catalyst preparation method provided by the present invention, the molecular sieve is contacted with the aqueous solution containing organic acid and inorganic acid for 0.5-3 hours, and then separated, and the separated molecular sieve may also include the steps of washing, drying and roasting. Separation, washing, drying, and roasting methods are well known to those skilled in the art. For example, the separation can use the method of filtration to separate the exchanged molecular sieve from the mother liquor; the molecular sieve can be washed with deionized water; it can be heated in an air drying oven. Or dry and roast the molecular sieve by flash drying method. The molecular sieve obtained through the above steps is called the molecular sieve obtained by low-temperature mixed acid exchange.

[0022]According to the preparation method of catalytic cracking catalyst provided by the present invention, in the catalyst washing step, the catalyst...

Embodiment 1

[0035] The preparation of present embodiment catalytic cracking catalyst comprises the following steps:

[0036] (1) Exchange washing of Y-type molecular sieves containing Na: take 2.7 kilograms of acetic acid, add appropriate amount of cold water and stir to make it dissolve, then add 8.1 kilograms of hydrochloric acid with a concentration of 36% by weight, then continue to add cold water to dilute the solution to 1000L to form H + Mixed acid solution with a molar concentration of 0.17mol / L, control the solution temperature: 3.5±0.5°C, add 71.4 kg of Y-type molecular sieve powder dry basis (H 2 O: The weight ratio of molecular sieve raw powder dry basis=14:1), then stirred and reacted at 3.5±0.5°C for 2 hours, then filtered the slurry, and used deionized water 5 times the dry basis weight of Y-type molecular sieve raw powder for the filter cake rinse;

[0037] (2) flash drying the product of step (1) and roasting at 550° C. for 3 hours;

[0038] (3) preparing molecular siev...

Embodiment 2

[0045] The catalytic cracking catalyst was prepared according to the method in Example 1, except for step (1) and step (6).

[0046] (1) Exchange and washing of Na-containing Y-type molecular sieves: Weigh 5.67 kilograms of oxalic acid and add an appropriate amount of cold water to stir to dissolve it, then add 15.75 kilograms of nitric acid with a concentration of 20% by weight, then continue to add cold water to dilute the solution to 1000L to form H + Mixed acid solution with a molar concentration of 0.14mol / L, control the solution temperature: 4.5±0.5°C, add 55.6 kg of Y-type molecular sieve powder on a dry basis (molecular sieve exchange liquid, H 2 O: The weight ratio of molecular sieve raw powder dry basis=18:1), then stirred and reacted at 4.5±0.5°C for 2.5 hours, then filtered the slurry, and used deionized water 5 times the dry basis weight of Y-type molecular sieve raw powder for the filter cake rinse;

[0047] (6) Catalyst washing: take by weighing 1134 grams of o...

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Abstract

The invention discloses a method for preparing a catalytic cracking catalyst. The method comprises the following steps of: performing molecular sieve exchange, preparing the catalyst, and washing the catalyst and is characterized in that the step of performing molecular sieve exchange comprises the following substeps of: contacting a molecular sieve and an aqueous solution containing organic acid and inorganic acid at the temperature of between 0 and 5 DEG C for 0.5 to 3 hours, wherein the weight ratio of H2O to the molecular sieve is (11-18):1; the step of washing the catalyst comprises the following substeps of: contacting the catalyst and the aqueous solution containing the organic acid and the inorganic acid at the temperature of between 0 and 5 DEG C for 10 to 30 minutes, wherein the weight ratio of H2O to the catalyst is (7-9):1; and based on the amount of H<+>, the concentration of the organic acid in the aqueous solution is 0.0001 to 0.2 mol / L, and the concentration of the inorganic acid is 0.0001 to 0.1 mol / L. According to the method, ammonium salt is not completely used in the preparation process of the catalyst, the problem of ammoniac nitrogen pollution can be solved from the source, and water consumption and the discharge of wastewater in the preparation process are reduced obviously.

Description

technical field [0001] The invention relates to a preparation method of a catalytic cracking catalyst, more precisely, relates to a method for reducing the content of sodium oxide in molecular sieves by using low-temperature mixed acid exchange, and washing the catalyst with low-temperature mixed acid to reduce the content of sodium oxide in the catalyst. Background technique [0002] In the production process of catalytic cracking catalyst, ammonium salt is widely used to reduce the Na in the catalyst and its active component zeolite molecular sieve. + Perform ion exchange to improve its catalytic cracking performance. For example, Chinese patents CN1210034A, CN1065844A, US4,357,265 and US3,455,842 all disclose the preparation method of molecular sieves using ammonium salts for exchange. In order to increase the Na + Excessive ammonium salt is often used in the existing exchange process, and multiple exchanges with fresh solutions, such as the exchange of NaY molecular sie...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/08B01J37/06
Inventor 张蔚琳周灵萍许明德李峥朱玉霞田辉平
Owner CHINA PETROLEUM & CHEM CORP
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