Behaviour of slash pine wood (Pinus elliottii Engelm.) extractives during pulping using catalyzed 80% aqueous methanol, was studied in detail. Particularly, the main resin-and fatty acids (RAFA) were characterized before and after the pulping trials. RAFAthus collected were saponified and/or methylated and characterized by gas liquid chromatography (GC or GLC) and gas chromatography-mass spectrometry. Pulping experiments were performed at 205°C for periods of 5, 20, 40 and 60 min. RAFAsurviving the high-temperature pulping process, were found mainly in the black liquor.The extractives were recovered from the black liquor by a selective tertiary component liquid/liquid extraction procedure, using diethyl ether äs the third (extracting) solvent. In the black liquor, substantial quantities of resin acids (89.8%) and fatty acids (25.6%) were detected already after 5 min cooking. After a 60 min cook the black liquor contained 78.1% and 71.6% resin-and fatty acids, respectively, while the pulp retained 11.7% and 8.2%, respectively. Effective extractives removal from the black liquor was observed on precipitation of the lignin (Lignin II) by dilution with 10 times volume of water. Lignin II can potentially carry 98% and 60.4% of the resinand fatty acids, respectively, leaving only minor amounts of resin acids (2%) and some fatty acids (39.6) dissolved in the aqueous filtrate. A small fraction of lignin which precipitates on cooling of the black liquor ("Lignin I") adsorbed and carried 10.2% and 20.2% of the resin-and fatty acids, respectively. Methods for recovery of an uncontaminated (by extractives) lignin are discussed. Opportunities for generating another byproducts stream, by organosolv pulping of resinous woods, are pointed out.These same considerations motivated organosolv pulping trials by Klcinert andTaycnthal in 1931 using aqueous cthanol äs the pulping solvent for woods at tempcratures similar to those uscd in kraft pulping. In later experiments with 50:50 ethanol-watcr at 185 °C, it Holzforschung /Vol. 46 /1992 / No. 6