| abstract |
The invention relates to a method (200, 201, 202) for recovering alkaline solution (1) from aqueous alkaline solution (2) contaminated with hemicelluloses (22), and to a device (100, 101) for carrying out the method (200, 201, 202), in which the aqueous alkaline solution (2) is guided as feed flow (14), and process water (10) as counter flow (15) by way of an ion exchanger diffusion dialysis (3, 31) having at least one dialysis membrane (4, 41, 42, 43, 44, 45) between feed flow (14) and counter flow (15), and is thereby converted into an alkaline-enriched diffusate (13) as recovered alkaline solution (1) and a dialysate (9) enriched with hemicelluloses (22). The aim of the invention is to reduce the maintenance effort of the method of the type mentioned at the beginning, and to increase the service life thereof. This aim is achieved, according to the invention, in that prior to delivery to the ion exchanger diffusion dialysis (3, 31), gas components (28) are removed from the process water (10) of the counter flow (15). |