Preparation method of attapulgite-based solid acid catalyst for vegetable fat epoxidation
A technology of solid acid catalyst and vegetable oil, which is applied in the direction of physical/chemical process catalysts, chemical instruments and methods, and fatty acid production. The effect of stability
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Embodiment 1
[0024] (1) Fully stir 10 g of attapulgite, 200 g of water, and 1 g of sodium hexametaphosphate, soak for 24 h; fully stir the soaked suspension at 80°C for 120 min, let it stand for 0.5 h, and absorb it by siphon method The supernatant is 10 cm; add water to the same position, repeat the above operations of settling, standing, and absorbing the supernatant; put the extracted supernatant in an oven to dry, crush, and pass through a 200-mesh sieve to obtain purified attapulgite ; Mix 5 g of the above-mentioned purified attapulgite, 1 g of acid and 15 ml of water, stir at 30°C for 180 min, filter, dry, grind, and pass through a 200-mesh sieve to obtain acid-modified attapulgite; Take 3 g of acid-modified attapulgite, heat it at 200°C for two hours, and then add 1.5 g of N-( β -Aminoethyl)- gamma -Aminopropyltrimethoxysilane, 98.5 g toluene, reflux for 24 hours, filter, grind, pass through a 200-mesh sieve, and vacuum-dry at 80°C for 3 hours to obtain organically modified attapul...
Embodiment 2
[0028] (1) Fully stir 15 g of attapulgite, 200 g of water, and 1 g of sodium hexametaphosphate, soak for 24 h; fully stir the soaked suspension at 80°C for 60 min, let it stand for 0.5 h, and absorb it by siphon method The supernatant is 10 cm; add water to the same position, repeat the above operations of settling, standing, and absorbing the supernatant; put the extracted supernatant in an oven to dry, crush, and pass through a 200-mesh sieve to obtain purified attapulgite ; Mix 10 g of the above-mentioned purified attapulgite, 5 g of acid and 50 ml of water, stir at a constant temperature of 60 ° C for 30 min, then filter, dry, grind, and pass through a 200-mesh sieve to obtain acid-modified attapulgite; Weigh 3 g of acid-modified attapulgite, keep it warm at 200°C for two hours, then add 8 g of γ-aminopropyltriethoxysilane and 92 g of toluene, reflux for 24 hours, filter, grind, pass through a 200-mesh sieve, and Vacuum drying at 80°C for 6 h to obtain organically modified...
Embodiment 3
[0032] (1) Fully stir 20 g of attapulgite, 100 g of water, and 0.1 g of sodium hexametaphosphate, and soak for 24 h; stir the soaked suspension at 60°C for 90 min while ultrasonically oscillating, let it stand for 0.5 h, and siphon Absorb the supernatant 10 cm by the method; add water to the same position, repeat the above operations of settling, standing, and absorbing the supernatant; put the extracted supernatant in an oven to dry, crush, and pass through a 200-mesh sieve to obtain purified concave-convex Attapulgite: Mix 10 g of the above-mentioned purified attapulgite, 2 g of acid and 50 ml of water, stir at 90°C for 180 min, filter, dry, grind, and pass through a 200-mesh sieve to obtain acid-modified attapulgite ; Weigh 3g of acid-modified attapulgite, heat at 200°C for two hours, add 4 g of cetyltrimethylammonium chloride, 96 g of toluene, reflux for 24 hours, filter, grind, pass through a 200-mesh sieve, and put in 80 ℃ vacuum drying for 3 h to obtain organically modi...
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