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
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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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