Chemistry of carbon compounds – Miscellaneous organic carbon compounds – C-metal
Patent
1974-01-11
1976-04-20
Gerstl, Robert
Chemistry of carbon compounds
Miscellaneous organic carbon compounds
C-metal
C07C 6748
Patent
active
039520471
ABSTRACT:
A method of purifying crude pyrethrum extract through the use of acetonitrile as the extracting agent comprising the method steps of mixing crude pyrethrum extract with acetonitrile, separating the acetonitrile-pyrethrum extract layer at a temperature effective to precipitate out undesirable impurities and waxes in such acetonitrile-pyrethrum extract, removing the acetonitrile by distillation, mixing the concentrated pyrethrum extract with an amount of mineral spirits effective to precipitate out undesirable impurities, and removing the mineral spirits by distillation.
REFERENCES:
patent: 3042706 (1962-07-01), Haus et al.
Merck Index, 8th Ed., pp. 8, 671, (1968).
Kassera Dean C.
Moore Joseph B.
Gerstl Robert
McLaughlin Gormley King Company
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