Process for preparing L-ascorbic acid

Details Process for preparing L-ascorbic acid Process for preparing L-ascorbic acid

1983-03-23

1985-01-01

Milestone, Norma S.

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C07D30762

Patent

active

044916680

ABSTRACT:
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.degree.-75.degree. 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.degree.-75.degree. 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.

REFERENCES:
patent: 2129317 (1938-09-01), Elger
patent: 2179978 (1939-11-01), Elger
patent: 2462251 (1949-02-01), Bassford et al.

Affiliated with

Also associated with

Rating

Process for preparing L-ascorbic acid does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Process for preparing L-ascorbic acid, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for preparing L-ascorbic acid will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-577866