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AssigneeEvonik Degussa GmbH
InventorsHubertus Eickhoff, Florian Lode, Eduardo Arevalo, Marc Brendel, Claudia Wallert
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The invention is directed to a process for concentrating aqueous hydrogen peroxide solution to give at least two hydrogen peroxide streams of different concentration in an apparatus which includes a preevaporator (1), a distillation column (2) and a vapour compressor (3). The aqueous hydrogen peroxide solution to be concentrated (4) is continuously fed into the preevaporator; vapour (5) produced by evaporation in the preevaporator is fed to the distillation column; bottom product (6) obtained in the preevaporator is withdrawn as a first concentrated hydrogen peroxide stream (7); vapour (8) produced in the distillation column is withdrawn from the distillation column at the top of the column, compressed by the vapour compressor and used for heating the preevaporator; and the bottom product (9) obtained in the distillation column is withdrawn as a second concentrated hydrogen peroxide stream (10); Concentrated hydrogen peroxide solutions having differing concentrations in the range from 50 to 70% by weight of hydrogen peroxide can be produced at the same time in a freely selectable ratio by feeding part of the bottom product obtained in the preevaporator in liquid form to the distillation column.
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.
A process for concentrating an aqueous hydrogen peroxide solution in an apparatus comprising a preevaporator, a distillation column separate from said preevaporator and a vapour compressor to give at least three 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, 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.
Dependencies are inferred from the claim text.