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Method for reducing ammonium and nitrogen consumption in FCC (Fluid Catalytic Cracking) catalyst production process

A technology of catalysts and catalyst particles, applied in molecular sieve catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve problems such as ammonium nitrogen pollution, achieve the effect of reducing the amount of ammonium nitrogen, reducing the content of sodium oxide, and ensuring the washing effect

Active Publication Date: 2013-01-09
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The waste liquid after molecular sieve exchange and catalyst washing is high ammonium nitrogen wastewater, which needs to be treated at a huge cost before it can be discharged, otherwise, it will cause serious ammonium nitrogen pollution to the environment

Method used

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  • Method for reducing ammonium and nitrogen consumption in FCC (Fluid Catalytic Cracking) catalyst production process

Examples

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Effect test

preparation example Construction

[0017] In the preparation method of the FCC catalyst provided by the present invention, during the molecular sieve exchange process, the molecular sieve is contacted with the acid solution for 0.5-3 hours, and then separated, and the steps of washing, drying and roasting the separated molecular sieve can also be included. The methods of separation, washing, drying and roasting are well known to those skilled in the art. For example, the separation can be done by filtering to separate the exchanged molecular sieve from the mother liquor; the molecular sieve can be washed with deionized water.

[0018] In the preparation method of the FCC catalyst provided by the invention, in the washing step of the catalyst, the catalyst particle containing the exchanged molecular sieve is contacted with an acid solution to carry out the washing reaction, so as to reduce the content of sodium oxide in the catalyst. Wherein, the acid solution includes inorganic acid and organic acid, and the ino...

Embodiment 1

[0028] The preparation of present embodiment FCC catalyst comprises the following steps:

[0029] (1) Exchange washing of NaY molecular sieve: take by weighing 4.48 kilograms of citric acid and add appropriate amount of cold water and stir to make it dissolve, then add concentration and be 8.1 kilograms of hydrochloric acid of 36% by weight, then continue to add cold water to dilute the solution to 1000L and be made into H + Acid solution with a molar concentration of 0.15M (M is mol / L, in which the concentration of citric acid is 0.07M and the concentration of hydrochloric acid is 0.08M). kg, then stirred and reacted at 3±0.5°C for 1.5 hours, filtered, washed with deionized water, and the amount of washing water was 10 times the weight of the molecular sieve;

[0030] (2) flash drying the product of step (1) and roasting at 550° C. for 3 hours;

[0031] (3) preparing molecular sieve slurry by beating the product of step (2) according to the ratio of molecular sieve dry basis...

Embodiment 2

[0038] Prepare FCC catalyst by the method described in embodiment 1, difference is step (1) and step (6).

[0039] (1) The exchange washing of NaY molecular sieve: take by weighing 9.45 kilograms of oxalic acid, add appropriate amount of cold water and stir to make it dissolve, add concentration and be 5 kilograms of hydrochloric acid of 36% by weight, then continue to add cold water and dilute the solution to 1000L and be made into H + Acid solution with a molar concentration of 0.20M, control the solution temperature: 2±0.5°C, add 100 kg of NaY molecular sieve (dry basis) under stirring, then stir at 2±0.5°C for 2.0 hours, then filter the slurry, filter cake Rinse with deionized water 10 times the weight of molecular sieve;

[0040] (6) Catalyst washing: take by weighing 380 kilograms of oxalic acid and add appropriate amount of cold water and stir to make it dissolve, then add 1000 grams of hydrochloric acid with a concentration of 36% by weight, then continue to add cold w...

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Abstract

The invention discloses a method for preparing a FCC (Fluid Catalytic Cracking) catalyst, which comprises the steps of exchanging molecular sieves, preparing catalyst granules containing the exchanged molecular sieves and washing the catalyst, wherein the step of exchanging the molecular sieves comprises that the molecular sieves are contacted with low-concentration aqueous solution of inorganic acid and organic acid for 0.5 to 3 hours at the temperature of between 0 and 5 DEG C and separation is performed; and the step of washing the catalyst comprises that the catalyst is contacted with thediluted solution of the organic acid and the inorganic acid for 10 to 60 minutes at the temperature of between 0 and 5 DEG C. The method can be used for preparing the high-performance cracking catalyst and reduce the ammonium and nitrogen consumption in the catalyst preparation process.

Description

technical field [0001] The invention relates to a method for reducing the amount of ammonium nitrogen used in the production process of an FCC 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, US 4,357,265 and US 3,455,842 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 sieves with ammonium salts, one exchange can make the NaY in the molecular sieve 2 The O content can be reduced to about 5.0% by weight, and the method of multiple exchanges and intermediate roasting can m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/70B01J29/40B01J29/08B01J37/00
Inventor 周灵萍张蔚琳许明德李峥田辉平朱玉霞严加松
Owner CHINA PETROLEUM & CHEM CORP
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