Abstract
The chlorination product prepared in carbontetrachloride can be separated more neatly by precipitation method than by evaporating off the solvent. For, when the solution is heated on a water bath, it yields a product not only dark coloured but also hardly separable from the flask. The precipitation method adopted in the present work will be summarized as follows: First of all the concentration of the product in carbontetrachloride is adjusted to 15% referring to a preliminary test made on a small fraction of the whole solution. Methanol should be ad-ded to this 15% solution till the three components (the product, methanol and carbontetrachloride) stand at equilibrium, and then the mixture is gradually poured into a weighed amount of methanol that is being stirred throughout this process. Thus the product is precipitated in the form of white powder with the yield of 90% or so. Subsequently it is air-dried. The yield does not reach 100%, since the equilibrium exists among these components.
