Method of purifying triaryl phosphate

Details Method of purifying triaryl phosphate Method of purifying triaryl phosphate

1978-05-09

1980-05-20

Sutto, Anton H.

Chemistry of carbon compounds

Dipeptides, e.g., aspartame, anserine, carnosine, etc.

260966, C07F 909

Patent

active

042039339

ABSTRACT:
A method of purifying triaryl phosphate to be used as electrical insulating oil, comprising a first step of washing the phosphate with the aqueous solution of alkali, a second step of diluting the phosphate with aromatic insulating oil, a third step of treating the diluted phosphate with acid clay in an atmosphere of dry gas so that the acid clay adsorbs the impurities in the phosphate and a fourth step of treating the phosphate under reduced pressure for removal of any remaining impurities therefrom.

REFERENCES:
patent: 1462306 (1923-07-01), St. John
patent: 1840335 (1932-01-01), ter Horst
patent: 2605279 (1952-07-01), Edwards et al.
Grin, "Clay Mineralogy," McGraw-Hill, 1962, pp. 320-321 & 326-331.
Siddiqui, "Bleaching Earths," Pergamon Press, 1968, pp. 1-3, 44-45 & 50-55.
Kirk-Othmer, "Encyclopedia of Chemical Technology" vol. 5, (1964), pp. 541-555.

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