Direct Thermochemical Liquefaction



The present invention relates to the preparation and use of bio-oil as a preservative. More specifically, this invention is directed to the use of bio-oil as a wood preservative, either alone or in combination with other preservatives. Furthermore, this invention is related to methods for recycling wood preservatives from treated wood products.

According to the present invention there is provided a bio-oil composition comprising derivatized lignin, alcohol, natural organic acids, carbonyls that is liquid at room temperature, wherein said bio-oil exhibits properties of a preservative. This bio-oil composition may further be characterized in comprising 2-methoxy-4-methylphenol and 3,4-dimethoxybenzoic acid.


Freel, B. and Graham, R.G. Ensyn Technologies, Inc., Bio-oil Preservatives, (26 Nov 2002) U.S. patent 6,485,841.