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US 5,141,611 AGranted
Removing and recovering plant polyphenols
AssigneeMemtec Limited
InventorDouglas L. Ford
Life of this patent
Estimating the term…
Abstract
Polyphenolic substances such as food dyes, tannins, fruit juices and wine colorings are removed from a solution by adsorption onto a regeneratable adsorbent polyamide of extended surface and controlled porosity. The surface chemistry of the polyamide may be modified by a glutaraldehyde/resorcinol treatment. The polyphenolic substances are recovered by elution with water or other protonic solvent.
Claims24
A method of removing a polyphenolic substance from a solution, comprising the steps of:
- (a) preparing a polyamide adsorber by
- (i) dissolving a drawn polyamide in an acid solution, wherein the w/w range of acid to polyamide is from 1.32:1.00 to 2.80:1.00 for a sufficient time and temperature to produce an acidic, partly hydrolyzed colloidal solution thereof,
- (ii) allowing said solutions to mature for at least one hour,
- (iii) precipitating the colloidal solution of polyamide to form said polyamide adsorber, and
- (b) adsorbing said polyphenolic substance from said solution onto said polyamide adsorber.
2 more elements
A method of removing a polyphenolic substance and a hydroxymethyl-furfural derived color from a solution containing the same, comprising the steps of:
- (a) preparing a polyamide adsorber by
- (i) dissolving a drawn polyamide in an acid solution is from 1.32:1.00 to 2.80:1.00 for a sufficient time and temperature to produce an acidic, partly hydrolyzed colloidal solution thereof,
- (ii) allowing said solutions to mature for at least one hour,
- (iii) precipitating the colloidal solution of polyamide to form said polyamide adsorber, and
- (b) adsorbing the polyphenolic substance onto said polyamide adsorber;
- and
- (c) removing the hydroxymethyl-furfural derived color by contacting said solution with activated carbon.
4 more elements
Dependencies are inferred from the claim text.