| 摘要 |
In the hydrolysis of nicontinonitrile to nicotinamide, the hydrolysis effluent, containing nicotinamide, unconverted nicotinonitrile, ammonia and some ammonium nicotinate is stripped with gaseous ammonia to produce a molten nicontinamide bottoms, essentially free of nicotinonitrile, containing less than 10 wt % water and an overhead containing water vapor, ammonia and nicotinonitrile. An aqueous solution of ammonia and unreacted nicotinonitrile is recovered from the overhead and recycled to the hydrolysis, with gaseous ammonia in the overhead being recycled to the stripping. |
