Tannin extraction and processing

Details Tannin extraction and processing Tannin extraction and processing

1994-01-24

1995-05-23

Geist, Gary

Compositions

Preservative agents

Anti-oxidants or chemical change inhibitants

252398, 252404, 252406, 44307, 156335, 514783, 527400, A61K 3578, C07G 1700

Patent

active

054178886

ABSTRACT:
A method for producing a relatively low viscosity tannin extract from bark and/or wood and suitable for use in formaldehyde-condensation adhesives comprises providing tannin extract obtained from bark and/or wood, separating from the tannin extract the high molecular weight material, subjecting the high molecular weight material to treatment with one or more sulphite compounds to reduce the molecular weight and recombining the sulphited material with the tannin extract. The tannin extract may be recovered by subjecting bark and/or wood to a first stage hot aqueous tannin extraction process, thereby obtaining a first stage tannin extract, subjecting the extracted bark and/or wood to a second stage hot aqueous extraction process at a higher pH than the first stage, thereby obtaining a second stage tannin extract, and optionally recombining the first and second stage tannin extracts.

REFERENCES:
patent: 4521336 (1985-06-01), Dilling
Australian Standard, entitled "Adhesives For Timber And Timber Products Part 1 Adhesives For Plywood Manufacture" AS 2754.1-1985, pp. 1-7.
Stamdards Association Of Australia, entitled "Australian Standard Methods Of Test For Veneer And Plywood" AS 2098.2-1977, pp. 2-1 thru 2-8.
A. Journal-article entitled "Investigations On The Tannins OF Pinus Radiata Bark" by H. Anderson and A. Bilkens-1985, pp. 183-191.

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