Rectification
A second distilla- weight of the same while in pulp can be retion of a fluid, for the purpose of rendering it duced to the simple manipulation of weighing purer. In rectifying alcohol containing wa- it in a vessel. Find the weight of a vessel ter, the distillation is conducted at a tempera- full of the pulp; then weigh the same vessel ture high enough to evaporate the alcohol and full of the same liquid that the pulp is moistcause it to distill over into the receiver, but ened with, and note down the difference benot high enough to boil the water, the greater tween the weights. Next divide this differpart of which, therefore, remains behind in ence of weight by the difference between the the body of the still. It is difficult to obtain specific gravities of the pulp and the liquid; an anhydrous product without employing lastly add this quotient to the difference of some agent having a strong affinity for water. weight already noted down, and the sum will