Patent ID: 9120061
Filing Date: 2015-09-01
Classification: B01D,B03D,C12P

Abstract:
1. A process for the treatment of a stream of substances which contains at least one substance from each of the following groups: (A) amino acids; (B) carboxylic acids different from amino acids and having from 1 to 5 C-atoms; and (C) inorganic salts; wherein the stream of substances derives from silage liquids, and which process comprises the steps of: (1) treating the stream of substances by a two- or multi-stage nanofiltration, wherein at least one of the stages carried out after the first stage is configured as a diafiltration, and obtaining a retentate enriched with substance (A); (2) treating the permeate of step (1) by a first electrodialysis and obtaining a concentrate enriched with substance (C); (3) treating the diluate of step (2) by reverse osmosis and a second electrodialysis, wherein at least a portion of the retentate of the reverse osmosis is supplied to the second electrodialysis, and at least a portion of the diluate of the second electrodialysis is supplied to the reverse osmosis, and wherein at least a portion of the permeate of the reverse osmosis and at least a portion of the diluate of the second electrodialysis are supplied to the two- or multi-stage nanofiltration; and (4) obtaining a concentrate enriched with substance (B) in the second electrodialysis.