| http://www.w3.org/ns/prov#value | - It is of particular advantage to introduce gaseous hydrogen chloride, (optionally together with an inert gas such as nitrogen or carbon dioxide) into the solution of the bis-urea at a temperature within the range of 100??? to 200??? C. In general, approximately 5 to 50 wt. % solutions of the bis-urea are used.
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