PROCESS FOR PRECIPITATING CYTOSINE FROM ALKALINE SOLUTIONS WITH SULPHURIC ACID

摘要

The invention relates to an improved process for precipitating cytosine from an aqueous solution of an alkali or alkaline earth metal salt of cytosine using sulphuric acid. An aqueous solution of the cytosine salt, at elevated temperature, is adjusted to a pH in the range 2 to 7 by means of an organic or inorganic acid, preferably sulphuric acid, the solution is freed of solid constituents and the cytosine is precipitated with sulphuric acid as the aqueous solution cools.