Compound modification method for USY molecular sieve

A compound modification and molecular sieve technology, which is applied in molecular sieve catalysts, chemical instruments and methods, hydrocarbon oil cracking, etc., can solve problems such as a large decrease in crystallinity, and achieve high crystallinity and high crystallinity.

Inactive Publication Date: 2014-06-25
PETROCHINA CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

HCl, HNO 3 and H 2 SO 4 Dealumination is simply relying on H + Dealumination, so the crystallinity drops greatly, and the acid concentration and modification time must be strictly controlled

Method used

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  • Compound modification method for USY molecular sieve
  • Compound modification method for USY molecular sieve
  • Compound modification method for USY molecular sieve

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Prepare citric acid solutions with concentrations of 0.10mol / L, 0.15mol / L, 0.20mol / L and 0.25mol / L; prepare 0.10mol / L ammonium fluorosilicate solution;

[0022] Weigh 4 parts of industrial USY, 12g each, and add them to 250ml three-necked flasks respectively;

[0023] Add 60ml of citric acid solutions of different concentrations to each flask, stir, and heat up to 70°C;

[0024] When the temperature rises to 70°C, continuously add 60ml of ammonium fluorosilicate solution at a rate of 1ml / min;

[0025] The liquid-solid ratio is 10, and the volume ratio of the citric acid solution to the ammonium fluorosilicate solution is 1.0.

[0026] After addition, continue to react for 3h;

[0027] The obtained product was washed with deionized water until neutral, and dried at a constant temperature of 110° C. for 16 hours to obtain modified samples, which were marked as F-2, F-3, F-1, and F-4.

[0028] The results of the modified USY pore volume of each sample are shown in Table...

Embodiment 2

[0032] Prepare a citric acid solution with a concentration of 0.15mol / L; prepare a 0.10mol / L ammonium fluorosilicate solution;

[0033] Weigh 4 parts of industrial USY, 12g each, and add them to 250ml three-necked flasks respectively;

[0034] Add 60ml of citric acid solution to each flask, stir, and heat up to 70°C;

[0035] When the temperature rises to 70°C, add 60ml of ammonium fluorosilicate solution to each flask at a rate of 0.75ml / min, 1ml / min, 1.25ml / min and 1.5ml / min respectively;

[0036] The liquid-solid ratio is 10, and the volume ratio of the citric acid solution to the ammonium fluorosilicate solution is 1.0.

[0037] After addition, continue to react for 3h;

[0038] The obtained product was washed with deionized water until neutral, and dried at a constant temperature of 110° C. for 16 hours to obtain modified samples, labeled as F-8, F-3, F-9, and F-10.

[0039] The results of the modified USY pore volume of each sample are shown in Table 2.

[0040] Tabl...

Embodiment 3

[0044] Prepare a citric acid solution with a concentration of 0.15mol / L; prepare a 0.10mol / L ammonium fluorosilicate solution;

[0045] Weigh 4 parts of industrial USY, 12g each, and add them to 250ml three-necked flasks respectively;

[0046] Add 60ml of citric acid solution to each flask, stir, and heat up to 70°C;

[0047] When the temperature rises to 70°C, add 60ml of ammonium fluorosilicate solution to each flask at a rate of 1ml / min;

[0048] The liquid-solid ratio is 10, and the volume ratio of the citric acid solution to the ammonium fluorosilicate solution is 1.0.

[0049] After the feeding was completed, the reaction was continued, and the reaction times were 2h, 3h, 4h and 5h, respectively.

[0050] The obtained product was washed with deionized water until neutral, and dried at a constant temperature of 110° C. for 16 hours to obtain modified samples, labeled as F-11, F-3, F-12 and F-13.

[0051] The results of the modified USY pore volume of each sample are sh...

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Abstract

The invention relates to a method for a structural design of a USY molecular sieve, and particularly relates to a compound modification method for the USY molecular sieve, wherein ammonium fluosilicate and citric acid are taken as a modifying agent in the method. The method is used for preparing a modified USY molecular sieve which has abundant secondary porous structures, high crystallinity and abundant medium-strong acid, and the modified USY molecular sieve is applicable to a hydrocracking catalyst which is used for producing prolific middle distillate as a target product.

Description

technical field [0001] The invention relates to a method for structural design of USY molecular sieves, in particular to a compound modification method for USY molecular sieves. Background technique [0002] Hydrocracking technology is one of the important secondary processing means for lightening heavy oil. Most of the hydrocracking catalysts used contain molecular sieves, especially modified high-silicon Y molecular sieves. For hydrocracking catalysts that produce more middle distillates, modified high-silicon Y molecular sieves have the characteristics of fewer acid centers, high acid strength, and abundant secondary pores. The utilization rate also requires the crystallinity of the molecular sieve to be as high as possible. [0003] There are three main methods for Y molecular sieve modification: (1) high temperature hydrothermal method; (2) chemical method, and (3) a combination of high temperature hydrothermal and chemical methods. The high-temperature hydrothermal m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/24C10G47/16B01J29/08B01J35/10
Inventor 阎子峰乔柯刘欣梅许本静王莹莹何丽凤张志华戴宝琴王甫村
Owner PETROCHINA CO LTD
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