CHEMISTRY: M. COM BERG 
425 
It was established that not only is it unnecessary to keep on neutralizing 
the hydrochloric acid produced with the progress of the reaction, but 
that in fact it is inadvisable to do so. 
Separation of chlorhydrin. — Pure chlorhydrin boils at 128°C. It was 
found, however, that when mixed with water in proportion of 42.5 parts 
of the former and 57.5 parts of the latter, the two form a constant boiling 
mixture which distills at 95.8°. Consequently, aqueous solutions of 
chlorhydrin poorer than 42.5% tend to give on distillation initial frac- 
tions approaching in composition the constant boiling mixture; solutions 
richer than 42.5% give as the final fractions pure chlorhydrin. With the 
addition of salt or calcium chloride to the Kquid to be distilled, concen- 
trations of chlorhydrin up to 80% can be readily obtained. The dia- 
gram shows what happens when 5, 10 and 15% solutions of chlorhydrin 
are subjected to distillation. 
Chlorhydrin is miscible with water in all proportions. It has, how- 
ever, been found that it can be salted out from its aqueous solutions, 
provided that the proper conditions as to initial concentration, etc., are 
