Method for preparing catalytic cracking aid

A technology of catalytic cracking and additives, applied in the direction of hydrocarbon cracking, molecular sieve catalysts, chemical instruments and methods, etc., can solve ammonia nitrogen pollution and other problems, achieve the effect of eliminating ammonia nitrogen pollution, solving ammonia nitrogen pollution problems, and reducing wastewater treatment costs

Active Publication Date: 2012-11-28
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 additive 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

Method used

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  • Method for preparing catalytic cracking aid
  • Method for preparing catalytic cracking aid

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preparation example Construction

[0025] In the preparation method of catalytic cracking additive provided by the present invention, the molecular sieve is contacted with the aqueous solution containing inorganic acid and organic acid for 0.5-2 hours, and then separated, and the steps of washing, drying and roasting the molecular sieve obtained after separation may also be included. 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.

[0026] According to the preparation method of the catalytic cracking additive provided by the present invention, in the washing...

Embodiment 1

[0039] The preparation of the present embodiment catalytic cracking propylene auxiliary agent comprises the following steps:

[0040] (1) Exchange washing of NaZSM-5 molecular sieve: Weigh 8.7 kilograms of acetic acid and add an appropriate amount of cold water to stir to dissolve it, then add 18.9 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 a low-concentration mixture Acid solution, control the solution temperature: 1±0.5°C, add 125 kg of NaZSM-5 molecular sieve raw powder dry basis (molecular sieve exchange liquid, H 2 O: the weight ratio of molecular sieve raw powder dry basis=8:1), then stirred and reacted at 1±0.5°C for 2 hours, then filtered the slurry, and the filter cake was drenched with deionized water 5 times the weight of NaZSM-5 molecular sieve raw powder wash.

[0041] (2) flash drying the product of step (1) and roasting at 550° C. for 3 hours;

[0042] (3) preparing mo...

Embodiment 2

[0049] The catalytic cracking propylene auxiliary agent was prepared according to the method in Example 1, except for step (1) and step (6).

[0050](1) Exchange washing of NaZSM-5 molecular sieve: Weigh 11.34 kg of oxalic acid, add appropriate amount of cold water and stir to dissolve it, then add 7.1 kg of hydrochloric acid with a concentration of 36% by weight, then continue to add cold water to dilute the solution to 1000L to form a low-concentration mixture Acid solution, control the solution temperature: 2±0.5°C, add 167 kg of NaZSM-5 molecular sieve raw powder dry basis (molecular sieve exchange liquid, molecular sieve exchange liquid, H 2 O: the weight ratio of molecular sieve raw powder dry basis=6:1), then stirred and reacted at 2±0.5°C for 2 hours, then filtered the slurry, and the filter cake was drenched with deionized water 5 times the weight of NaZSM-5 molecular sieve raw powder wash;

[0051] (6) Auxiliary washing: take 2268 grams of oxalic acid, add an approp...

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Abstract

The invention discloses a method for preparing a catalytic cracking aid. The method comprises the following steps of performing molecular sieve exchange, preparing a propylene aid and washing the propylene aid 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 inorganic acid and organic acid at the temperature of between 0 and 5 DEG C for 0.5 to 2 hours, wherein the weight ratio of H2O to the molecular sieve is (5-10):1, and based on the amount of H<+>, the concentration of the organic acid in the aqueous solution is 0.009 to 0.9 mol/L, and the concentration of the inorganic acid is 0.001 to 0.1 mol/L; the step of washing the propylene aid comprises the following substeps of: contacting the propylene aid and the aqueous solution containing the inorganic acid and the organic acid at the temperature of between 0 and 5 DEG C for 10 to 100 minutes, wherein the weight ratio of H2O to the propylene aid is (5-9):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 used in the preparation process of the propylene aid, 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 additive, more precisely, it involves using a low-temperature mixed acid exchange to reduce the sodium oxide content in molecular sieves, and washing the propylene additive with a low-temperature mixed acid to reduce the sodium oxide in the propylene additive content method. Background technique [0002] In addition to the cracking catalyst used in the catalytic cracking process, there are also a variety of catalytic cracking additives that play an auxiliary role. Increase the octane number of gasoline, increase the yield of liquefied gas and the concentration of propylene in it, and promote the conversion of CO into CO 2 , passivate the toxicity of heavy metal impurities in raw materials to catalyst activity and reduce SO in regeneration flue gas x content and so on. The use of additives has many advantages. Adding additives can trigger a certain reaction and work; when the addit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/40B01J29/80C07C11/06C07C4/06
CPCY02P20/52
Inventor 周灵萍张蔚琳李峥许明德朱玉霞田辉平
Owner CHINA PETROLEUM & CHEM CORP
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