Committee on Library—Andrew Leslie, James P. Purcell, William M. Dade.
Executive Committee—John Purcell, W. S. Bum, R. R. Duval:—
After which, several nominations were made. Appropriations were placed at the disposal of the library committee for subscriptions to various periodicals, and for the purchase of books, after which, the meeting adjourned.
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NEW YORK JOURNAL OF PHARMACY. SEPTEMBER, 1852.
ON THE OIL OF GRAIN SPIRIT, OR FUSEL OIL. BY EDWARD N. KENT.
The oil of grain spirit, has recently attracted considerable attention from the fact of its being the basis of a number of artificial perfumes or essences, one of which has been extensively used under the name of banana or pear essence.
The crude oil, as is well known, consists principally of hydrated oxide of amyl, mixed with more or less alcohol, and small quantities of other substances, the nature of which is not generally known, though it has been asserted that œnanthic ether and œnanthic acid may be found among them. To obtain the latter articles was a desired object, and that which led to the subject of this paper.
Crude fusel oil, (or oil of grain spirit) when distilled in a glass retort, commences to pass over at about 190° Fahrenheit, and a considerable portion is obtained below 212; which consists mostly of alcohol and water, with a small quantity of the hydrated oxide of amyl. By changing the receiver and continuing the operation to about 280°, a large product is obtained, consisting principally of hydrated oxide of amyl, but contaminated with a little alcohol and water, and a trace of less volatile oil, which may be found in larger quantity in the residue remaining in the retort. This residue is small, of an agreeable odor, and consists of several substances among {258} which may be found, an oil having the intoxicating smell, but not the chemical properties of œnanthic ether, other than a similarity in its boiling point.
To obtain a more perfect separation of the substances contained in the crude oil, a small copper still was constructed, on the principal which is now so successfully used in the manufacture of high proof alcohol, and which proved highly useful for the above purpose. This still is so arranged, that the vapor which is evolved by the boiling liquid, passes through a series of bent tubes, each of which is connected with a return pipe for returning vapors less volatile than boiling water, back to the still. These tubes are enclosed in a copper funnel filled with cold water, which becomes heated as the operation proceeds, and finally boils; the less volatile vapors are thus prevented from passing over, and the alcohol and water are almost perfectly separated from the oil remaining in the still.—If the water is then drawn off from the vessel containing the serpentine tube, the distillation may be continued till it ceases spontaneously.