Patent ID: 9206047
Filing Date: 2015-12-08
Classification: B01D,C01B,Y10S

Abstract:
1. A process for concentrating an aqueous hydrogen peroxide solution in an apparatus comprising a preevaporator, a distillation column and a vapour compressor to give at least two hydrogen peroxide streams of different concentration, said process comprising feeding an aqueous hydrogen peroxide solution to be concentrated continuously to the preevaporator, feeding vapour produced by evaporation in the preevaporator to the distillation column via a conduit, withdrawing bottom product from the preevaporator as a first concentrated hydrogen peroxide stream, withdrawing vapour from the distillation column at the top of the column and compressing it with the vapour compressor for heating the preevaporator, and withdrawing bottom product from the distillation column as a second concentrated hydrogen peroxide stream, wherein part of the bottom product from the preevaporator is fed in liquid form to the distillation column via a conduit.