Method for extracting Vitamin C and gulonic acid from Vitamin C mother liquor
A vitamin and coronic acid technology, applied in the separation/purification of carboxylic acid compounds, organic chemistry, etc., can solve the problems of three-waste pollution, inability to recrystallize, etc., and achieve the effects of high resin utilization, low production cost, and improved product quality.
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[0033] In the preparation method of the resin of the present invention, the reaction conditions of the suspension polymerization may be well-known suspension reaction conditions in the art. In a preferred example of the present invention, the reaction temperature of the suspension reaction is 60-110°C, preferably 75-90°C, the pressure is normal pressure, and the reaction time is 4-10 hours, preferably 6 to 7 hours.
[0034] 2. Acidic cationic functionalization of resin matrix
[0035] The gel or macroporous reticular cross-linked interpolymer containing acrylic acid group and / or methacrylic acid group synthesized by the present invention can be obtained by hydrolysis only due to its own acidic functional group. Suitable type of weakly acidic cationic resin.
[0036] The gel or macroporous network cross-linked interpolymer containing acrylate groups and / or methacrylate groups synthesized by the present invention needs to be hydrolyzed by a NaOH solution with a concentration o...
Embodiment
[0052] In the simulated moving bed operating system composed of eight 40mm×1200mm chromatographic columns connected in series, the macroporous acidic cationic resin synthesized by 30% styrene monomer and 70% methacrylate-based monomer is filled. The liquid is vitamin C mother liquor, wherein the concentration of vitamin C is about 18.5%, and the concentration of gulong acid is about 39%. The mother liquor is passed through a simulated moving bed. The operating conditions of the simulated moving bed are as follows: separation temperature 75°C, system pressure 1.1Mpa, feed The feed rate is 1L / h, the elution water feed rate is 3.5L / h, and the feed reaches equilibrium after 24 hours. The output obtained is as follows:
[0053] 1) Vitamin C part: the concentration of vitamin C is about 12.7%, the purity of vitamin C is 94.8%, and the concentration of gulong acid is 4.6% (the volume is 1.5 times of the mother liquor of vitamin C fed).
[0054] 2) Gulonic acid concentration: the con...
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