2601. ------. [PATART, G.] [Extracting Oils.] British Patent 249,519, Mar. 21, 1925. Chem. Abs., vol. 21, 1927, p. 973.

In the hydrogenation or extraction of byproducts from organic substances at high temperatures and pressures, the gases or liquids, or both, used are those that are already heated and compressed during industrial operations such as exothermic synthesizing reactions; for example, production of MeOH from H₂ and CO in a catalytic process. Gases from this reaction may be passed upward through a digester packed with pine wood while liquid from the same catalytic process is passed downward through the material. Petroleum oils and coal or similar materials may be similarly treated.