Method of purifying pyrethrum extract

Details Method of purifying pyrethrum extract Method of purifying pyrethrum extract

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).

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