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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 molecular sieve catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of many process steps, unstable catalyst quality and type, cumbersome process, etc., and achieve stable product quality, The effect of improving catalytic activity and performance and simplifying the process

Active Publication Date: 2015-04-08
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 with a concentration of 20% by weight (commercially available, industrial grade), and 300 grams of purified water was added. Then add 300 grams of ZMS-5 molecular sieves with a dry basis content of 95% by weight, and grind them in a high-speed homogenizer for 20 minutes; take another commercially available 98% by weight industrial-grade concentrated sulfuric acid, and prepare a concentration of 40% by weight sulfuric acid solution. 1000 grams, added to the sodium silicate solution reactor containing molecular sieve for reaction, mixed quickly and uniformly to form a mixed solution, control the pressure of the nozzle of the vortex mixing reactor to be about 0.55Mpa, spray the mixed solution into the air, and spray to create a mixed solution. The granules were formed into spherical hydrogels, and the hydrogels were collected and soaked in a water pool containing 4% by weight of dilute sulfuric acid solution for 4 hours to form stab...

Embodiment 2

[0031] with SiO 21500 grams of sodium silicate with a concentration of 25% by weight (commercially available, industrial grade), and 500 grams of purified water was added. Then add 600 grams of ZMS-5 molecular sieves modified by P of 98 wt % on a dry basis, and grind them in a high-speed homogenizer for 20 minutes; take commercially available 98 wt % industrial-grade concentrated sulfuric acid, and prepare a concentration of 50 1550 grams of wt% sulfuric acid solution was added to a sodium silicate solution reactor containing molecular sieves for reaction, mixed quickly and uniformly to form a mixed solution, the pressure of the nozzle of the vortex mixing reactor was controlled to be about 0.55Mpa, and the mixed solution was sprayed into the air In the process, spray granulation into spherical hydrogels, the hydrogels are collected and soaked in a pool containing 4% (weight) of dilute sulfuric acid solution for 4 hours to form stable gel balls, and then the gel balls are sepa...

Embodiment 3-7

[0033] The basic preparation process 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 are different), and the post-processing parameters are different. The preparation conditions and the prepared catalyst 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 molding 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 an increasing impact on the petroleum industry. Catalyst molding is one of the important steps in the catalyst preparation process. Only by preparing a catalyst of suitable shape, size and mechanical strength through certain molding processing methods can it meet the requirements of catalyst reactions and devices, and give full play to its activity and selectivity. The early preparation of spherical catalysts used oil-ammonia column forming technology. The technology firstly mixes sol with dilute acid to form an unstable sol, which is dripped into the turbine oil column through the nozzle at the lower part of the distribution umbrella. The upper layer of the oil co...

Claims

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Application Information

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Patent Type & Authority Patents(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