Process for preparing l-ascorbic acid

Details Process for preparing l-ascorbic acid Process for preparing l-ascorbic acid

C - Chemistry, Metallurgy

07

D

260/366.7

C07D 307/62 (2006.01)

Patent

CA 1190552

Abstract of the Disclosure L-ascorbic acid is prepared from sodium 2-keto-L- gulonate by introducing gaseous hydrogen chloride in a molar ratio of about 1.5 - 2.0 to the sodium-2-keto-L-gulonate into a mixture composed of the sodium 2-keto-L-gulonate, ethanol and acetone at a ratio of 1 : 0.25 - 1.00 : 0.5 - 2.5 by weight at a temperature of about 25 - 75°C until precipitation of sodium chloride ends, removing the precipitated sodium chloride before L-ascorbic acid begins to crystalize out, maintaining the filtrate or supernatant at a temperature of about 25 - 75°C for a period of 5 - 100 hours and cooling it to yield crystals of L-ascorbic acid as a final product. A solvent inert to the L-ascorbic acid and 2-keto-L-gulonate may be added to the filtrate or supernatant with a favorable result in obtaining purer intended product. - 15 -

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