A kind of solid acid catalyst and its preparation method and the preparation method of p-hydroxyphenylglycine
A technology of p-hydroxyphenylglycine and solid acid catalyst, which is applied in catalyst activation/preparation, preparation of organic compounds, preparation of cyanide reaction, etc., can solve the problems of long process route, long reaction time, cumbersome operation, etc., to reduce pollution , The effect of high reuse rate and low dosage
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[0028] The invention provides a kind of preparation method of solid acid catalyst, comprises the following steps:
[0029] Perform hydrothermal synthesis reaction of silica sol, aluminum hydroxide and inorganic strong base to obtain hydrothermal synthesis product system;
[0030] performing an ion exchange reaction with the hydrothermal synthesis product system and ammonium nitrate solution to obtain a solid acid catalyst precursor;
[0031] The solid acid catalyst precursor is calcined to obtain a solid acid catalyst.
[0032] In the invention, silica sol, aluminum hydroxide and inorganic strong base are subjected to hydrothermal synthesis reaction to obtain a hydrothermal synthesis product system.
[0033] In the present invention, the hydrothermal synthesis reaction of silica sol, aluminum hydroxide and inorganic strong base preferably specifically includes first mixing the silica sol and aluminum hydroxide uniformly to obtain a gel, and then adding The inorganic strong b...
Embodiment 1
[0050] Mix 1.0 mol of silica sol, 160 mol of aluminum hydroxide and 0.2 mol of sodium hydroxide, and carry out hydrothermal synthesis reaction at 200°C for 40 hours to obtain a hydrothermal synthesis product system; add 100 mL of 0.3 mol / L of ammonium nitrate solution, carried out ion exchange reaction 3 times at 70°C, dried at 120°C for 6h to obtain a solid acid catalyst precursor; roasted the solid acid catalyst precursor at 520°C for 5h, and ground to The particle size is 0.8 μm, and a solid acid catalyst is obtained, and the acidity of the solid acid catalyst is H 0 ≤-3, the acid content is 1.56mmol / g cat.
Embodiment 2
[0052] Mix 1.0 mol of silica sol, 20 mol of aluminum hydroxide and 0.03 mol of sodium hydroxide, and conduct a hydrothermal synthesis reaction at 150°C for 12 hours to obtain a hydrothermal synthesis product system; add 50 mL of 0.1 mol / L ammonium nitrate solution, ion exchange reaction was carried out 3 times at 60°C, and dried at 100°C for 8h to obtain a solid acid catalyst precursor; the solid acid catalyst precursor was roasted at 450°C for 3h, and ground to The particle size is 0.5 μm, and a solid acid catalyst is obtained, and the solid acid catalyst H 0 ≤-3, the acid content is 1.35mmol / g cat.
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