Preparation method capable of increasing macropore volume of silicon dioxide carrier
A silica, macropore volume technology, applied in catalyst carriers, chemical instruments and methods, chemical/physical processes, etc., can solve the problems of reduced processing capacity, insufficient macropores, easy pulverization, etc., and achieve macropore volume. Increase, the effect of expanding the hole is obvious, the effect of adding a large amount
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Embodiment 1
[0024] Take by weighing 1000g precipitated silica powder (average particle diameter 32um, specific surface area 126m 2 / g,Na 2 (00.15%), 100g polypropylene ultra-fine powder (average particle diameter 8um, get 10g put crucible 600 ℃ of burning and have no visible residue), add in the high-speed mixer that is provided with pressure type atomizing nozzle, seal feed opening , start the mixer to stir, and use the plunger type high-pressure pump as the power, spray 1000g polyacrylamide aqueous solution (mass concentration 0.5%) into atomized spray, stop stirring after 5min, let stand for 5hr, start stirring, and then add 400g silicon Sol (SiO 2 Mass concentration 30%, Na 2 (0.04%, colloidal average diameter 25nm) atomization sprays in, stops the mixer to stir after 5min, discharges, extrudes into the strip of outer diameter 3mm with twin-screw extruder after kneading by kneader, 110 ℃ of drying, Calcined at 660°C for 3 hours to obtain a silica carrier with a measured lateral com...
Embodiment 2
[0027] Weigh 1000g of precipitated silica powder identical to that of Example 1, 300g of polyethylene ultrafine powder (average particle diameter of 16um, take 10g and place it in a crucible at 600°C for burning without visible residue) and add it to the tank equipped with a pressure atomizing nozzle. In the high-speed mixer, close the feed port, start the mixer to stir, and use the plunger type high-pressure pump as the power, first atomize and spray 800g of carboxymethyl cellulose aqueous solution (mass concentration 0.3%), and stop stirring after 5 minutes. Stand still 5hr and start stirring, 600g silica sol (SiO 2 Mass concentration 30%, Na 2 (00.04%, colloid average diameter 10nm) atomization is sprayed into, after 5min, stop mixer and stir, discharge, extrude into the strip of outer diameter 3mm with twin-screw extruder after kneading by kneader, dry at 110 ℃, Calcined at 600°C for 3 hours to obtain a silica carrier with a measured lateral compressive strength of 171N / c...
Embodiment 3
[0030] Take by weighing 1000g of precipitated silica powder identical to that of Example 1, 15g of turnip powder (1250 mesh), 200g of polystyrene superfine powder (average particle diameter 25um, get 10g and put in a crucible at 600°C for burning without visible residue ) into a high-speed mixer provided with a pressure-type atomizing nozzle, close the material opening, open the mixer to stir, and take the plunger type high-pressure pump as power, first 800g α-starch aqueous solution (mass concentration 0.3%, gelatinization temperature 65°C) atomized and sprayed in, stop stirring after 5min, let stand for 5hr and start stirring, then add 700g of silica sol (SiO 2 Mass concentration 20%, Na 2 (0.03%, colloid average diameter 15nm) atomization sprays in, stops the mixer to stir after 5min, discharges, after being kneaded by kneader, extrude into the strip of outer diameter 3mm with twin-screw extruder, 110 ℃ of drying, Calcined at 630°C for 3 hours to obtain a silica carrier wi...
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