| abstract |
A method (200, 201, 202) for recovering alkaline solution (1) from aqueous alkaline solution (2) contaminated with hemicelluloses (22), and a device (100, 101) for carrying out the method (200, 201, 202), in which the aqueous alkaline solution (2) as feed stream (14) and process water (10) as countercurrent (15) via an ion exchanger diffusion dialysis (3, 31) with at least one dialysis membrane (4, 41, 42, 43 , 44, 45) between feed stream (14) and countercurrent (15) and are thereby converted into an alkaline enriched diffusate (13) as recovered alkaline solution (1) and a dialysate (9) enriched with hemicelluloses (22). In order to reduce the maintenance effort of the method of the type mentioned at the outset and to increase its service life, it is proposed that gas components (28) be removed from the process water (10) of the counterflow (15) before being fed to the ion exchanger diffusion dialysis (3, 31) . |