tert-Butyl alcohol.

§ 21.101 tert-Butyl alcohol. (a) Acidity (as acetic acid). 0.003 percent by weight maximum. (b) Color. Colorless. (c) Distillation range. When 100 mL of tertiary butyl alcohol are distilled, none should distill below 78 °C. and none above 85 °C. More than 95 percent should distill between 81 °−83 °C. (d) Dryness at 20 °C. Miscible without turbidity with 19 volumes of 60° Bé1. gasoline. (e) Freezing point (first needle). Above 20 °C. (f) Identification test. Place five drops of a solution containing approximately 0.1 percent tertiary butyl alcohol in ethyl alcohol in a test tube. Add 2 mL of Denige's reagent (dissolve 5 grams of red mercuric oxide in 20 mL of concentrated sulfuric acid; add this solution to 80 mL of distilled water, and filter when cool). Heat the mixture just to the boiling point and remove from the flame. A yellow precipitate forms within a few seconds. (g) Nonvolatile matter. Less than 0.005 percent by weight. (h) Odor. Characteristic odor. (i) Residual odor after evaporation. None. (j) Specific gravity at 25 °/25 °C. 0.780 to 0.786. [T.D. ATF–133, 48 FR 24673, June 2, 1983. Redesignated by T.D. ATF–442, 66 FR 12854, Mar. 1, 2001]