Benzine, To Color Green.
Purification Of Benzine.
Fatty acid from tallow, olive oil, or other fats may be used, but care should be taken that they have as slight an odor of rancid fat as possible. The so-called elaine or olein—more correctly oleic acid—of the candle factories may likewise be employed, but it should first be agitated with a 1/10-per-cent soda solution to get rid of the bad-smelling fatty acids, especially the butyric acid.
The Prevention Of The Inflammability Of Benzine.
Substitute for Benzine as a Cleansing Agent.—
| I.— | Chloroform | 75 parts |
|---|---|---|
| Ether | 75 parts | |
| Alcohol | 600 parts | |
| Decoction of quillaya bark | 22,500 parts | |
| Mix. | ||
| II.— | Acetic ether, technically pure | 10 parts |
| Amyl acetate | 10 parts | |
| Ammonia water | 10 parts | |
| Alcohol dilute | 70 parts | |
| Mix. | ||
| III.— | Acetone | 1 part |
| Ammonia water | 1 part | |
| Alcohol dilute | 1 part | |
| Mix. | ||
Deodorizing Benzine.—
| I.— | Benzine | 20 ounces |
|---|---|---|
| Oil of lavender | 1 fluidrachm | |
| Potassium dichromate | 1 ounce | |
| Sulphuric acid | 1 fluidounce | |
| Water | 20 fluidounces |
Dissolve the dichromate in the water, add the acid and, when the solution is cold, the benzine. Shake every hour during the day, allow to stand all night, decant the benzine, wash with a pint of water and again decant, then add the oil of lavender.
II.—First add to the benzine 1 to 2 per cent of oleic acid, which dissolves. Then about a quarter of 1 per cent of tannin is incorporated by shaking. A sufficient quantity of caustic potassa solution, or milk of lime, to combine with the acids is then well shaken into the mixture, and the whole allowed to stand. The benzine rises to the top of the watery fluid, sufficiently deodorized and decolorized for practical purposes.