Extraction of coniferous woods with fluid carbon dioxide and oth

Details Extraction of coniferous woods with fluid carbon dioxide and oth Extraction of coniferous woods with fluid carbon dioxide and oth

1980-07-10

1981-12-29

Cockeram, H. S.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260 977, C09F 300, C09F 100

Patent

active

043082009

ABSTRACT:
Disclosed is a process for extraction of coniferous woods, such as pine, with supercritical fluids to recover tall oil and turpentine, or components thereof. Gases such as carbon dioxide, nitrous oxide, nitrogen, and lower alkanes or lower alkenes at temperatures above critical and pressures of about 100 psi above critical; i.e., supercritical fluids, are contacted with subdivided wood. The extracted wood is suitable for pulping and subsequent papermaking. The extract-bearing fluid is preferably stripped of the extracts by reducing the pressure in stages, each pressure reduction effecting removal of extracts of a narrowly-defined molecular weight range. The fluid is recompressed and recycled.

REFERENCES:
patent: 1762785 (1930-06-01), Little
patent: 2388412 (1945-11-01), Hixson et al.
patent: 3969196 (1976-07-01), Zosel

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