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Preparation method of wear-resistant microspheroidal silica carrier

A spherical silica, silica technology, applied in the direction of catalyst carrier, chemical instrument and method, chemical/physical process, etc., can solve the problem that the mechanical strength and wear resistance of the carrier are reduced, the wear resistance of the carrier cannot be greatly improved, and the sintering Poor performance and other problems, to achieve the effect of long service life, not easy to break, and stable performance

Inactive Publication Date: 2016-05-04
钟俊超
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, preparing a microspherical silica carrier with suitable pore structure, mechanical strength and wear resistance is a technical problem in this field, because silica raw materials such as precipitated silica and fumed silica are usually sintered The performance is poor; using silica sol as a binder can improve the mechanical strength and wear resistance of the silica carrier, but the effect is limited. Even after recrystallization treatment such as hydrothermal treatment, the wear resistance of the carrier cannot be greatly improved
Using alumina, calcium oxide, kaolin, etc. as a binder can also improve the mechanical strength and wear resistance, but under acidic conditions, the acid-resistant components contained in the binder will be eroded, making the mechanical strength and wear resistance of the carrier Abrasiveness will gradually decrease

Method used

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  • Preparation method of wear-resistant microspheroidal silica carrier
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Examples

Experimental program
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Effect test

Embodiment 1

[0034] Take 1000g of calcined silica powder A, put it into a mixing tank, add 3000g of deionized water, start stirring and beating, after the dispersion is uniform, use a homogenizer to grind and disperse to the average particle diameter of 5um, transfer to an autoclave, add 200g of acetic acid, acetic acid Ammonium 50g, the PH value of the mixing solution to 3.5, crystallization treatment at 150°C for 40hrs, cooling to 60°C, the specific surface area of ​​silica particles was measured to be 122m 2 / g, add 2000g latex solution A (containing SiO 2 200g), fully mixed, pumped into a centrifugal spray granulator that has been preheated to 200°C working temperature for granulation, and adjusted the speed of the feed pump and centrifuge so that the average diameter of the obtained micropowder is 230um and the sphericity reaches a good Level, granulation is completed in 30 minutes, and the obtained granulated micropowder has better strength; half of the granulated micropowder is calc...

Embodiment 2

[0036] The other half of the granulated micropowder in Example 1 was calcined at 720° C. for 3 hours to obtain the wear-resistant microspherical silica carrier of the present invention. The average diameter of the measured carrier is 213um, the sphericity is good, and the strength is good; the specific surface area is 115m 2 / g, the pore volume is 0.60ml / g, and the average pore diameter is 23nm; the measured wear rate and fragmentation rate are relatively low, see the data listed in the table below for details.

Embodiment 3

[0038] Take 1000g of calcined silica powder B, put it into the mixing tank, add 3000g of deionized water, start stirring and beating, after the dispersion is uniform, use a homogenizer to grind and disperse to the average particle diameter of 5um, transfer to the autoclave, add 200g of acetic acid, acetic acid Ammonium 100g, the pH value of the sizing solution to 4.0, add 2000g emulsion A (containing SiO 2 200g), pumped into a centrifugal spray granulator that has been preheated to a working temperature of 240°C for granulation, and adjusted the speed of the feed pump and centrifuge so that the average diameter of the obtained micropowder was 230um and the sphericity reached a good level, 30 minutes After the granulation is completed, the strength of the obtained granulated micropowder is better; half of the granulated micropowder is calcined at 680° C. for 3 hours to obtain the wear-resistant microspherical silica carrier of the present invention. The average diameter of the ...

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Abstract

The invention provides a preparation method of a wear-resistant microspheroidal silica carrier. The preparation method comprises roasting precipitation silica powder or white carbon black with a specific surface area of 250-600m<2> / g at a temperature of 730-760 DEG C so that a specific surface area is reduced to 100-220m<2> / g, adding water into the roasting product, carrying out uniform mixing, carrying out grinding dispersing to obtain microparticles with the average diameter of 2-5 microns, adding acetic acid and ammonium acetate into the microparticles, carrying out crystallization treatment at a temperature of 150-180 DEG C, adding a white carbon black emulsion into the treated microparticles, carrying out uniform mixing, carrying out spray granulation and roasting the granule powder to obtain microspheroidal carriers with the average diameter of 50-250 microns, a specific surface area of 80-200m<2> / g, a pore volume of 0.5-0.7ml / g and the average pore diameter of 20-40nm. The wear-resistant microspheroidal silica carrier has high mechanical strength, wear resistance and impact resistance, is suitable for further loading with active components and can be used for preparation of a fluidized bed catalyst.

Description

technical field [0001] The invention belongs to the field of catalysts, and relates to a method for preparing a microspherical silica carrier, in particular to a method for preparing a wear-resistant and impact-resistant microspherical silica carrier. Background technique [0002] In addition to having a suitable pore structure, the catalyst should also have high mechanical strength and wear resistance, especially in the fluidized bed, between catalyst particles, between catalyst particles and the inner wall of the reactor, between catalyst particles and the solid phase in the fluidized bed There will be frequent friction and collision between the reaction raw materials or products, and the formed broken particles will expand the fluidized bed layer, and the formed finer powder, such as the part below 10-15um, is easy to blow off the fluidized bed, basically Scrapped. [0003] Preparing the carrier first, and then impregnating the active component is the most commonly used ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J32/00B01J21/08B01J35/08B01J35/10
CPCB01J21/08B01J35/51B01J35/613B01J35/615B01J35/635B01J35/647
Inventor 钟俊超
Owner 钟俊超
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