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US 8,945,645 B2Granted
Method for simultaneous concentration and rectification of grape must using nanofiltration and electrodialysis
AssigneeInstituto Superior Tecnico
InventorsMaria Norberta Neves Correia de Pinto, Victor Manuel Geraldes Fernandes, Isabel Margarida Martins Lopes Catarino Gomes
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Abstract
The invention described herein relates to a process for the simultaneous concentration and rectification of grape must with the retention of the volatile aromas precursors. The process consists in the integration of nanofiltration in concentration/diafiltration modes, with electrodialysis. The nanofiltration membranes exhibit selective permeation controlled by steric hindrance mechanisms and/or electrostatic interactions.
Claims24
A method for the simultaneous concentration and rectification of grape must comprising:
- subjecting grape must to nanofiltration using nanofiltration membranes in a single operation in order to achieve simultaneous concentration and, at least partial, rectification of grape must,
- controlling degree of rectification, which consists of the passage of the organic acids to the permeate, of the must by controlling concentration factor;
- wherein grape must sugars are retained in a retentate stream and are partially separated from organic acids that permeate to the permeate stream, and
- wherein the nanofiltration membranes have values of cut-off ranging from 150 to 300 Dalton and an active layer electrically charged.
1 more element
Dependencies are inferred from the claim text.