Organic compounds -- part of the class 532-570 series – Organic compounds – Carboxylic acids and salts thereof
Patent
1979-07-30
1980-10-07
Niebling, John F.
Organic compounds -- part of the class 532-570 series
Organic compounds
Carboxylic acids and salts thereof
252431C, C11C 100, C09F 508
Patent
active
042270200
ABSTRACT:
A method for preparing naphthenic acids consists in that a petroleum fraction is oxidized at a temperature of 135.degree.-140.degree. C. in the presence of catalyst consisting of manganese naphthenate and potassium naphthenate; the obtained mixture of organic oxygen-containing compounds containing naphthenic and hydroxynaphthenic acids is diluted with an organic solvent, and the hydroxynaphthenic acids are precipitated and separated; the solution of the organic oxygen-containing compounds freed from hydroxynaphthenic acids in said organic solvent is treated with an aqueous solution of sodium hydroxide; thus obtained aqueous solution of sodium naphthenates is separated; said aqueous solution of sodium naphthenates is treated with diethyl sulphate at a temperature of 90.degree.-95.degree. C. to isolate ethyl naphthenates from which a fraction of ethyl naphthenate boiling out in a temperature range of 75.degree.-170.degree. C. is separated by rectification in vacuum of 3 mm Hg; the isolated fraction of ethyl naphthenates is treated with an aqueous solution of sodium hydroxide and the end product is isolated by the action of mineral acids.
REFERENCES:
patent: 2144855 (1939-01-01), Rutherford
patent: 2519309 (1950-08-01), Denton
patent: 3183279 (1965-05-01), Mills
Akhundov Arif A.
Aliev Vagab S.
Bocharov Jury N.
Lugovskoi Vladimir D.
Miramanian Akop A.
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