| 摘要 |
<p>The present invention relates to a vertical multitubular gaslift reactor for the production of melamine from urea at high pressure, said reactor comprising: a first lower zone (1) comprising a urea inlet (2) for molten urea and an ammonia inlet (3) for gaseous ammonia; a second middle zone (4) comprising at least five riser tubes (5) wherein a lower density feed mixture is flowing upwards and wherein the reaction of melamine synthesis occurs, a space (14) for a heating medium, a heating medium inlet (7) for supplying heating medium into said space, and at least one heating medium outlet (8) for removing heating medium from said space; and a third upper zone (11) comprising an off-gas outlet (12) for the removal of gaseous reaction products and a product outlet (13) for the removal of liquid melamine product, said reactor further comprising at least one downcomer (6) for circulating a higher density reaction mixture from the third zone (11) to the first zone (1). The invention also relates to a method for the production of high purity melamine.</p> |
