The analysis and grading of creosotes . zoo Z/P ZZO ZXf ZfOZ50 260 270° ZQO ZSO^ JOO J/0° JZO JJO° J^JS0J60 TEMPERA TURE Fig. 23.—Distillation limits for Grade A. such as is shown in figure 22. The flask which contained the frac-tion is rinsed out twice more with concentrated sulphuric acid andthe rinsings added to the funnel. Enough more concentrated sul-phuric acid is added nearly to fill the funnel, and the mixture is thor-oughly shaken at least six times in thirty minutes. After standing [Cir. 112] 39 until it becomes cool the volume is brought up into the graduationsby the addition of con
The analysis and grading of creosotes . zoo Z/P ZZO ZXf ZfOZ50 260 270° ZQO ZSO^ JOO J/0° JZO JJO° J^JS0J60 TEMPERA TURE Fig. 23.—Distillation limits for Grade A. such as is shown in figure 22. The flask which contained the frac-tion is rinsed out twice more with concentrated sulphuric acid andthe rinsings added to the funnel. Enough more concentrated sul-phuric acid is added nearly to fill the funnel, and the mixture is thor-oughly shaken at least six times in thirty minutes. After standing [Cir. 112] 39 until it becomes cool the volume is brought up into the graduationsby the addition of concentrated sulphuric acid, and after anotlierhour the amount of unsulphonated oil is read and the i:)ercontaore cal-cidated. The residual oil is usually almost white or a pale ])lue. Insome cases a reddish oil with a distinctive odor is obtained from a. 200 ZIO ZZXf Z50 ZW 250 260 270 280° 230 500° JIG 320°3J0° JiOJSO° J60 TLMPEIRATURE Fig. 24.—Distillation limits for Grade B. pure coal-tar creosote; this oil does not consist of hydrocarbons andis soluble in caustic alkalies. The sulphuric acid should, therefore, bedrawn off, the oil washed with water, and a 10 per cent solutionof sodium hydroxide added. If the oil is soluble in this reagent, thesulphonation test is regarded as negative. [Cir. 112] 40 TAR ACIDS. Fifty cubic centimeters of the creosote under analysis are measuredat 60° into a small distilling flask by a pipette. The oil is distilledas completely as possible without breaking the distilling bulb, and the
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