FIELD: organic chemistry. SUBSTANCE: method involves extraction by aqueous-organic solvent (e. g. 60- 65% ethanol) having additive of 3-5% calcium carbonate as calculated for dry raw materials. The process is followed by passing extract through anionite resin and cathionite resin. Desired product is eluated by distilled water and crystallized. Then organic solvent is added and thus prepared mixture is cooled. EFFECT: improves efficiency of the method. 1 tbl
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Authors
Dates
1994-03-15—Published
1991-08-15—Filed