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Preparation method of spherical molecular sieve based catalyst

A technology of spherical molecular sieve and molecular sieve, which is applied in the direction of molecular sieve catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of cumbersome process, unstable catalyst quality and type, and many process steps, so as to simplify the process, The effect of improving catalytic activity and performance and stabilizing product quality

Active Publication Date: 2013-10-23
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for producing spherical catalysts using a vortex or mixed-rotation mixing reactor, so as to overcome the shortcomings of the prior art, such as complex processes, many process steps, and unstable quality and type of catalysts produced.

Method used

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  • Preparation method of spherical molecular sieve based catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] with SiO 2 1000 grams of sodium silicate (commercially available, industrial grade) with a concentration of 20% by weight was added to 300 grams of purified water. Then add 300 grams of ZMS-5 molecular sieves with a dry basis content of 95% by weight, and grind for 20 minutes in a high-speed homogenizer; get commercially available 98% by weight of technical grade concentrated sulfuric acid in addition, and make a concentration of 40% by weight sulfuric acid solution 1000 grams, added to the sodium silicate solution reactor containing molecular sieves to react, quickly mixed evenly to form a mixed solution, control the pressure of the nozzle of the vortex mixing reactor at about 0.55Mpa, spray the mixed solution into the air, and spray to make Granulate into spherical hydrogel, collect the hydrogel into a pool containing 4% by weight of dilute sulfuric acid solution and soak for 4 hours to form a stable gel ball, then separate the gel ball from the acid solution and wash...

Embodiment 2

[0031] with SiO 21500 grams of sodium silicate (commercially available, industrial grade) with a concentration of 25% by weight was added to 500 grams of purified water. Adding 600 grams of P-modified ZMS-5 molecular sieves wherein dry basis content is 98% by weight again, grinds 20 minutes in high-speed homogenizer; Get commercially available 98% by weight technical grade concentrated sulfuric acid in addition, be made into concentration and be 50 1550 grams of sulfuric acid solution by weight, join in the sodium silicate solution reactor that contains molecular sieve and react, form the mixed solution after fast mixing, control the pressure of the nozzle of the vortex type mixing reactor at about 0.55Mpa, the mixed solution is sprayed into the air In, spray granulation into spherical hydrogel, the hydrogel is collected into the pool that contains the dilute sulfuric acid solution of 4% (weight) and soaks 4 hours, forms stable gel ball, then gel ball and acid solution are sep...

Embodiment 3-7

[0033] The basic process of preparation of Examples 3-7 is the same as that of Examples 1 and 2, except that the molecular sieves are replaced with other molecular sieves (dry basis is different), and the post-treatment parameters are different. The preparation conditions, prepared catalysts and properties are shown in Table 1.

[0034] Table 1 Preparation conditions and properties of spherical molecular sieve catalysts

[0035]

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Abstract

The invention discloses a preparation method of a spherical molecular sieve based catalyst, and aims to overcome the defects that in the prior art, the technical process is complicated, the working procedures are more, the quality and type of the produced catalyst are not stable and the like. The preparation method comprises the following steps: adding water into a sodium silicate solution with 15-29wt% of silicon dioxide in the mass ratio of water to sodium silicate solution of 0.2-1.0, and then adding a molecular sieve or a modified molecular sieve; evenly mixing with sulfuric acid solution with the concentration of 30-60wt%, wherein the mass ratio of sodium silicate molecular sieve dispersion liquid to sulfuric acid solution in the mixture is 1.0-5.0; spraying a mixed liquor into air through a nozzle of an eddy or mixing screw mixture reactor, so that the mixed liquor generates spherical gel grain through polycondensation, then carrying out acidification, washing, stoving and drying to obtain the spherical molecular sieve based catalyst.

Description

technical field [0001] The invention relates to a molecular sieve catalyst forming technology, in particular to a preparation method of a spherical molecular sieve catalyst in the oil refining industry. Background technique [0002] With the advancement of petroleum processing technology, catalyst development has a greater impact on the petroleum industry. Catalyst molding is one of the important steps in the catalyst preparation process. Only by preparing a catalyst with suitable shape, size and mechanical strength through certain molding processing methods can it meet the requirements of catalyst reaction and device, and give full play to its activity and selectivity. The early preparation of spherical catalyst technology used the oil-ammonia column forming technology. The technology first mixes the sol with dilute acid to form an unstable sol, which is dropped into the turbine oil column through the nozzle at the lower part of the distribution umbrella. The upper layer o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J35/08B01J29/40B01J29/70B01J29/85B01J29/18
Inventor 韩海波魏小波郝代军刘丹禾任潇航
Owner CHINA PETROLEUM & CHEM CORP