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2 137 752

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IPC

(21) (22)

Application

98103251/04, 1998-02-24

(24)

Start date

1998-02-24

(22)

Actual filing date

1998-02-24

(45)

Published

1999-09-20

(72)

Inventor

De Vekki Andrej Vasil'EvichStepanov D.N.De Vekki Dmitrij Andreevich

(73)

Holder

De Vekki Andrej Vasil'EvichStepanov Dmitrij NikolaevichDe Vekki Dmitrij Andreevich

CITRIC ACID PRODUCTION METHOD Russian patent published in 1999 - IPC

Abstract RU 2137752 C1

FIELD: industrial organic synthesis. SUBSTANCE: citric acid is prepared by oxidation of 4- methylenetetrahydropyran with nitric acid at 4 to 70 C in presence of 0.01 to 0.02% of ammonium perrhenate. Citric acid is extracted from oxidate with amyl fraction of fusel oil, using at least double excess of extractant with respect to the weight of formed citric acid. Extract solution is subjected to distillation at atmosphere pressure to isolate citric acid with melting point 152.5 C and yield up to 98.5%. Distilled extractant is recycled. EFFECT: simplified technology. 2 cl, 1 tbl

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RU 2 137 752 C1

Authors

De Vekki Andrej Vasil'Evich

Stepanov D.N.

De Vekki Dmitrij Andreevich

Dates

1999-09-20—Published

1998-02-24—Filed