A kind of preparation method of alkyl glycoside
A technology for alkyl glycosides and glucose, applied in the field of preparation of alkyl glycosides, can solve the problems of complex process, difficult separation of neutralized salts, long process flow, etc., and achieves the effects of expanding application area, low production cost and reducing difficulty
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Embodiment 1
[0018] In a 2000mL high-shear stirring stainless steel reactor with a reflux device, add 750Kg of fatty alcohol and 300Kg of glucose, maintain a vacuum of -95KPa and raise the temperature to 110°C for half an hour, then add NaHSO 4 1.5kg, the stirring speed is 150r / min, and the temperature is raised to 115°C, the mixer is turned on, and the vacuum reaction is maintained for 2 hours. At 130°C and 120 Pa absolute pressure, fatty alcohol is removed; 450Kg of water is added to dilute the product to a 50% solution; NaOH solution is added to adjust the pH value to 10, and the product is discharged to obtain an alkyl glycoside product. The measured absorbance of the product at a wavelength of 420nm is 0.012 (the absorbance of corrected distilled water is 0), the residual sugar is 0.07%, and the residual alcohol is 0.45%.
Embodiment 2
[0020] In a 20-ton reaction kettle, add 3 tons of anhydrous glucose and 12 tons of higher alcohols, start stirring, and raise the temperature to 105°C under a vacuum of -98KPa to vacuumize for 1 hour. Add 15Kg of anhydrous potassium bisulfate, heat up to 115°C, maintain absolute pressure at -98KPa, stir and react in vacuum for 2 hours, then filter, and the filtrate is adsorbed by resin to remove residual H + , and then the above-mentioned filtrate is sent to a thin-film evaporator, and the temperature in the kettle is controlled at 120° C. to dealcoholize under the condition of an absolute pressure of 100 Pa and a vacuum degree. After dealcoholization, the temperature was lowered to 80°C, and 4 tons of distilled water was added to adjust the solid content to 60% to obtain a light yellow aqueous solution of alkyl glycosides. Put the above alkyl glucoside solution into the bleaching kettle, add 50 kg of 30% hydrogen peroxide, stir and heat at a constant temperature of 50°C-70°C ...
Embodiment 3
[0022] In a 10-ton reactor, add 1.3 tons of anhydrous glucose, recover 200Kg of glucose, and 6 tons of higher alcohols, start stirring and raise the temperature to 110°C under a vacuum of -95KPa to vacuumize for 1 hour. Add 7.5Kg of anhydrous sodium hypophosphite, raise the temperature to 115°C, maintain absolute pressure -95KPa vacuum stirring reaction for 2h, then filter, and the filtrate is adsorbed by resin to remove residual H + , and then the above-mentioned filtrate is sent to a molecular distillation tower, and the temperature in the kettle is controlled at 120° C. to dealcoholize under the condition of an absolute pressure of 80 Pa and a vacuum degree. After dealcoholization, the temperature was lowered to 80°C, and 2.5 tons of distilled water was added to adjust the solid content to 50% to obtain a light yellow aqueous solution of alkyl glycosides. Put the above alkyl glucoside solution into the bleaching tank, add 15 kg of 30% hydrogen peroxide, stir and heat at a c...
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Abstract
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