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A supergravity method for preparing an aluminosilicate molecular sieve

A silica-alumina molecular sieve, supergravity technology, applied in chemical instruments and methods, crystalline aluminosilicate zeolite, chemical/physical/physical-chemical processes, etc. simple effect

Inactive Publication Date: 2018-06-29
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the shape of the product prepared by this method is not uniform

Method used

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  • A supergravity method for preparing an aluminosilicate molecular sieve
  • A supergravity method for preparing an aluminosilicate molecular sieve
  • A supergravity method for preparing an aluminosilicate molecular sieve

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Take 1.3g of aluminum sulfate, 90g of silica sol, 3.5g of sodium chloride, 6g of sodium hydroxide, 100g of tetrapropylammonium hydroxide, and 200g of deionized water. Feed by peristaltic pump, pre-mixed at the supergravity level of 100-200g, the reaction temperature is 130°C, the reaction time is 12h, after the reaction in the supergravity reactor, the product is taken out. Transfer the synthesized product to a centrifuge tube, centrifuge at 3000-5000rpm, centrifuge for 5-10min, pour off the supernatant, and then wash with water 5-6 times until the pH of the solution is neutral. Calculating for 5 hours at the bottom to obtain silicon-aluminum molecular sieves, which are independently dispersed particles, the crystal appearance of the product is lateral stripes, the average particle size is 300nm, and the particle size distribution is 150-450nm.

Embodiment 2

[0026] Take 0.45g of aluminum sulfate, 50g of silica sol, 2g of sodium chloride, and 78g of tetrapropylammonium hydroxide. The peristaltic pump feeds, premixes at a supergravity level of 100-200g, the reaction temperature is 150°C, and the reaction time is 6h. After the reaction in the supergravity reactor is completed, the product is taken out. Transfer the synthesized product to a centrifuge tube, centrifuge at 3000-5000rpm, centrifuge for 5-10min, pour off the supernatant, and then wash with water 5-6 times until the pH of the solution is neutral. Calculating for 5 hours at the bottom to obtain the silica-alumina molecular sieve, which is independently dispersed in the shape of round or elliptical particles, with an average particle size of 400nm and a particle size distribution of 200-450nm.

Embodiment 3

[0028] Take 0.5g of aluminum sulfate, 60g of silica sol, 1.5g of sodium chloride, and 90g of tetrapropylammonium hydroxide. Feed by peristaltic pump, pre-mixed at the supergravity level of 100-200g, the reaction temperature is 130°C, the reaction time is 12h, after the reaction in the supergravity reactor, the product is taken out. Transfer the synthesized product to a centrifuge tube, centrifuge at 3000-5000rpm, centrifuge for 5-10min, pour off the supernatant, and then wash with water 5-6 times until the pH of the solution is neutral. Calculating for 5 hours at the bottom to obtain silica-alumina molecular sieves, which are independently dispersed particles, most of which are dumbbell-shaped structures composed of two circles, and the particle size range is 300-1000nm.

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Abstract

The invention provides a supergravity method for preparing an aluminosilicate molecular sieve, and belongs to the field of catalyst preparation. An internal-circulating supergravity reactor is adoptedas a reaction device. A silicon source and an aluminum source are pumped into the reactor at the same time through a liquid feeding pipe, and initial gel is obtained after the two raw materials are premixed. A rapid mixing characteristic of supergravity is utilized by a reaction system so that a raw material ratio under a microcosmic condition is accurately controlled and regulated, and crystallization is performed in a microcosmic and uniform environment, and therefore nucleating and growing processes are uniform and controllable, crystals grow uniformly, and particle size distribution is narrowed. Proper process conditions for preparing the molecular sieve are obtained through influences of process condition changes on the synthesized molecular sieve.

Description

technical field [0001] The invention relates to a preparation method of a silica-alumina molecular sieve, which belongs to the field of catalyst preparation. Background technique [0002] Silico-alumina molecular sieve is a kind of aluminosilicate with uniform channels. This type of molecular sieve has three-dimensional straight channel channels and a typical MFI structure. Because of its unique channel structure and stable crystal structure, it uses its high ion Exchange, strong acidity, good thermal stability and good shape-selective catalytic performance, widely used in petrochemical industries such as catalytic cracking, dewaxing of lubricating oil fractions, conversion of methanol to gasoline, ethylene benzene alkylation, xylene isomerization, etc. Alkylation, etc., as well as fine chemicals, medicine, etc. promising in industrial applications. [0003] The synthesis methods of silica-alumina molecular sieves include hydrothermal method, microwave method, and non-aque...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/04B01J19/18
CPCB01J19/1875B01J2219/00081C01B39/04C01P2002/72C01P2004/03C01P2004/62
Inventor 孙宝昌康英英初广文邹海魁张亮亮罗勇陈建峰
Owner BEIJING UNIV OF CHEM TECH
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