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Exchange modification method for reducing content of sodium oxide in Y-type molecular sieve

A molecular sieve and sodium oxide technology, which is applied in the directions of favhedral crystalline aluminosilicate zeolite, crystalline aluminosilicate zeolite, etc., can solve problems such as difficulty in implementation, difficulty, ammonia nitrogen pollution, etc., and reduce water consumption, waste water discharge, crystallinity, etc. The effect of improving and eliminating the problem of ammonia nitrogen pollution

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

[0005] Visible, K + The exchange capacity is strong, and the Na in the zeolite can be easily exchanged + , but since K + The exchange capacity of NH is stronger than that of NH 4 + , use the ammonium salt to further exchange the K that has been exchanged to the zeolite + Obviously it is more difficult, and the exchanged K + It needs to be further exchanged by subsequent ammonium salts before zeolite can be used for catalytic cracking
This method is difficult to implement in industry, and needs to be exchanged with ammonium salt, and there is still the problem of ammonia nitrogen pollution

Method used

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  • Exchange modification method for reducing content of sodium oxide in Y-type molecular sieve

Examples

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Effect test

Embodiment 1

[0020] Weigh 2.7 grams of acetic acid, add an appropriate amount of cold water and stir to dissolve it, then add 8.1 grams of hydrochloric acid with a concentration of 36% by weight, and then continue to add cold water to dilute the solution to 1000ml to form a low-concentration mixed acid solution. Control the solution temperature: 3.5±0.5°C , add Y-type molecular sieve former powder dry base 71.4 grams (H 2 O: The weight ratio of molecular sieve raw powder dry base=14:1), then stirred and reacted at 3.5±0.5°C for 2 hours, then filtered the slurry, and the filter cake was rinsed with deionized water 5 times the weight of Y-type molecular sieve raw powder and drying to obtain a molecular sieve sample exchanged once with a low-temperature and low-concentration mixed acid solution, which is denoted as S1. Its properties and exchange water consumption are shown in Table 1.

Embodiment 2

[0022] Weigh 5.67 grams of oxalic acid, add an appropriate amount of cold water and stir to dissolve it, then add 15.75 grams of nitric acid with a concentration of 20% by weight, and then continue to add cold water to dilute the solution to 1000ml to form a low-concentration mixed acid solution. Control the solution temperature: 4.5±0.5°C , add Y-type molecular sieve former powder dry base 55.6 grams (H 2O: The weight ratio of molecular sieve raw powder dry base = 18:1), then stirred and reacted at 4.5±0.5°C for 2.5 hours, then filtered the slurry, and the filter cake was rinsed with deionized water 5 times the weight of Y-type molecular sieve raw powder and drying to obtain a molecular sieve sample exchanged once with a low-temperature and low-concentration mixed acid solution, which is denoted as S2. Its properties and exchange water consumption are shown in Table 1.

Embodiment 3

[0024] Weigh 12.8 grams of citric acid, add an appropriate amount of cold water and stir to dissolve it, then add 3.27 grams of phosphoric acid with a concentration of 50% by weight, then continue to add cold water to dilute the solution to a low-concentration mixed acid solution of 1000ml, control the solution temperature: 1 ± 0.5 ° C, Add Y-type molecular sieve former powder dry base 66.7 grams (H 2 O: The weight ratio of molecular sieve raw powder dry base = 15:1), then stirred and reacted at 1±0.5°C for 3 hours, then filtered the slurry, and the filter cake was rinsed with deionized water 5 times the weight of Y-type molecular sieve raw powder and drying to obtain a molecular sieve sample exchanged once with a low-temperature and low-concentration mixed acid solution, which is denoted as S3. Its properties and exchange water consumption are shown in Table 1.

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Abstract

The invention discloses an exchange modification method for reducing the content of sodium oxide in a Y-type molecular sieve. The exchange modification method is characterized by comprising the following steps of contacting the Y-type molecular sieve of which the content of Na is relatively high and an aqueous solution containing inorganic acid and organic acid at the temperature of 0 to 5 DEG C for 0.5 to 3 hours; and separating, washing and drying to obtain a Y-type molecular sieve of which the content of the sodium oxide is relatively low, wherein the weight ratio of H2O to the molecular sieve is (11-18):1. By the exchange modification method, ammonium salt is not required in the process of reducing the content of the sodium oxide in the Y-type molecular sieve, so that pollution caused by ammonia nitrogen can be eliminated at the source, and water consumption and waste water emission are obviously reduced in the Y-type molecular sieve exchange process.

Description

technical field [0001] The invention relates to a method for reducing sodium oxide content in Y-type molecular sieves. More precisely, it is a molecular sieve exchange modification method involving the exchange of molecular sieves with low-temperature mixed acid to reduce the content of sodium oxide in Y-type molecular sieves. Background technique [0002] In the production process of catalytic cracking catalyst, for the higher content of sodium oxide, ammonium salt is generally used to reduce the Na in the catalyst and its active component zeolite molecular sieve raw powder. + Perform ion exchange to reduce its sodium oxide content and improve its catalytic cracking performance. For example, CN1210034A, CN1065844A, US4,357,265 and US3,455,842 all disclose methods for exchanging sodium oxide in molecular sieves with ammonium salts. Since the exchange of sodium oxide in molecular sieves is difficult, in order to increase the Na + Excessive ammonium salt is often used in the...

Claims

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Application Information

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IPC IPC(8): C01B39/24
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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