| 摘要 |
1. Process for the preparation of iminodibenzyl of the formula (I) see diagramm : EP0158115,P5,F2 by heating 2,2'-diaminodibenzyl of the formula (II) see diagramm : EP0158115,P5,F3 with phosphoric acids in the molten state, characterized in that reaction is carried out continuously in several stages, wherein a) molten 2,2'-diaminodibenzyl and a phosphoric acid, each of which has a temperature of between 160 and 200 degrees C, are fed separately in a molar ratio of diaminodibenzyl : P2 O5 of 1 : 1 to 1 : 2.5 into the first stage, the neutralization takes place there, with evolution of heat, and the condensation is carried out in the subsequent reaction stages at a temperature of 260 degrees C to 320 degrees C, after which b) the uncooled reaction mixture from the last stage is transferred continuously into a heated separator and is separated at 160 degrees C to 300 degrees C into a product stream containing the upper phase of molten iminodibenzyl and a discharge stream containing, as the lower phase, phosphoric acid and ammonium phosphates. |
