Preparation method of allantoin for cosmetics
A technology for allantoin and cosmetics, which is applied in the field of cosmetics and can solve problems such as equipment corrosion, post-processing load pollution, and the inability to meet the quality requirements of cosmetic grade allantoin and pharmaceutical grade allantoin
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Embodiment 1
[0028]A preparation method of allantoin for cosmetics: 0.1 mol glyoxylic acid solution (mass concentration is 50%) and 0.4 mol urea are added in the microwave reactor, then 4.0g 1# catalyst is added thereto, and the reaction mixture is After reacting at 80°C for 12 hours, the catalyst was filtered and separated, and the product obtained was recrystallized to obtain the finished product of allantoin with a yield of 86.1%.
[0029] The preparation steps of described 1# catalyst are as follows:
[0030] (1) Mesoporous CeO 2 -ZrO 2 Preparation of composite oxides
[0031] Dissolve cerium nitrate and zirconium oxynitrate into deionized water, then add P123 to it and continue to stir for 30 min, then add 1mol / L Na 2 CO 3 After the pH value of the mixed solution reached 10, the aging treatment was continued for 16 h, the obtained product was centrifuged, washed, and dried at 105 °C for 12 h, and finally the obtained solid was roasted at 550 °C for 6 h to obtain a mesoporous struc...
Embodiment 2
[0039] A preparation method of allantoin for cosmetics: 0.3 mol glyoxylic acid solution (mass concentration is 50%) and 1.2 mol urea are added in the microwave reactor, then 8.0g 1# catalyst is added thereto, and the reaction mixture is After reacting at 90°C for 8 h, the catalyst was filtered and separated, and the resulting product was recrystallized to obtain the finished product of allantoin with a yield of 88.4%.
[0040] The preparation steps of described 2# catalyst are as follows:
[0041] (1) Mesoporous CeO 2 -ZrO 2 Preparation of composite oxides
[0042] Dissolve cerium nitrate and zirconium oxynitrate into deionized water, then add a certain amount of P123 to it and continue to stir for 30 minutes, then add 1mol / L Na 2 CO 3 After the pH value of the mixed solution reached 11, the aging treatment was continued for 10 h, the obtained product was centrifuged, washed and dried at 105 °C for 12 h, and finally the obtained solid was roasted at 650 °C for 4 h to obtai...
Embodiment 3
[0051] A preparation method of allantoin for cosmetics: 0.1 mol glyoxylic acid solution (mass concentration is 50%) and 0.3 mol urea are added in the microwave reactor, then 4.0g 3# catalyst is added thereto, and the reaction mixture is After reacting at 70°C for 24 hours, the catalyst was separated by filtration, and the resulting product was recrystallized to obtain the finished product of allantoin with a yield of 82.6%.
[0052] The preparation steps of described 3# catalyst are as follows:
[0053] (1) Mesoporous CeO 2 -ZrO 2 Preparation of composite oxides
[0054] Dissolve cerium nitrate and zirconium oxynitrate into deionized water, then add a certain amount of P123 to it and continue to stir for 30 minutes, then add 1mol / L Na 2 CO 3 After the pH value of the mixed solution reached 10.5, the aging treatment was continued for 12 hours, the obtained product was centrifuged and washed, then dried at 105°C for 12 hours, and finally the obtained solid was roasted at 600...
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