| 摘要 |
A method for the preparation of N-methyl ureas is disclosed, the improvement consisting in that the reaction is a catalytic hydrogenation of a mixture of an urea and formaldehyde, carried out in a single-step run and in a definitely acidic environment, contrarily to the conventional art, under high temperatures and pressures. Temperatures of 50.degree.C150.degree.C and pressures of from 20 to 150 kgs./sq.cm. are the prefurred field of action. |
