| 摘要 |
1313809 Biuret AE & CI Ltd 21 July 1971 [21 July 1970] 34184/71 Heading C2C Condensation products of urea (e.g. biuret) are produced by introducing a urea melt into the reaction zone of an elongate tubular reactor at sub-atmospheric pressure, maintaining the reactor wall in the reaction zone at a temperature of 110-250‹ C., forming a film of the melt on the wall, causing the film to flow along the wall, collecting the resulting reaction mass consisting of condensation products and unreacted urea, and cooling the mass. |
