Ind. Eng. Chem. Prod. Res. Dev. 1984, 23, 177-182 177 obtained. Since the degree of deuteration is dependent on how much deuterium is available for exchange, changing the ratio for deuterated to nondeuterated solvents in the generator would change the deuterium content in the final product.The system is therefore capable of producing linear and varying degrees of branched deuteriopolymethylenes having different physical and mechanical properties. Gram quantities of the deuterated polymer are obtained safely and conveniently in several hours with the semibatch bench-scale system described, with the potential for controlling molecular weight and percent deuteration. AcknowledgmentThe authors are grateful to glass technologist S. Mezynski and acknowledge the financial support provided by W. 0. Doggett and W. H. Bennett of Plasma Physics Research at NCSU. Literature Cited Adamson, D.; Kenner. J. J . Chem. Soc. 1935. 286. Ardt, F. Org. Syn. Coll. 1943. 2 , 461. Bamberger, E.; Tschlrner, F. Ber. 1900, 33. 955. de Boer, T. J.; Backer, H. J. Org. Syn. 1883, 4 . 943. Basted. H. S. The Indlcetw JUM 1989, 24. Buckley, G. D.; Cross, L. H.; Ray, N. H. J . Chem. Soc. 1950, 2714. Davles, A. G.; Hare, D. 0.; Khan, 0. R.; Slkera, J. J . Chem. Soc. 1983, 85, 4481. Feltzln, J.; Restlano, A. J.; Mesroblan, R. 8. J . Am. Chem. Soc. 1955, 77, 206. Intematbnal Technlcal Information Instkute, "Toxlc and Hazardous IndusM a1 Chemicals Safety Manual for Handling and Disposal with Toxlchy and Hazard Data", New York. 1975; p 157. Krakovyak, M.; Anufriyeva, Ye.; Skorokhodov, S. A semi-continuous spinning basket type reactor has been designed and built for the supercritical gas extraction of wood in a flowing solvent. Two factorial plans of experiments have been performed to study the extraction of fopulus tremu/okfes in methanol. The temperature range extended up to 350 O C and the pressure range to 17.01 MPa. Results for oil yield and wood conversion were obtained as functions of solvent flow rates, rate of agitation, nature of the reactor iining, wood chips size, and rate of temperature rise. The most important factors were identiRed as temperature, presswe, and solvent flow rate, the size of the wood particles being mainly significant at low pressure. These results are discussed in light of current knowledge on wood pyrolysis. Thigpen, P. L.; Berry, W. L. "Liquid Fuels from Wood by Continuous Operatiin of the Albany, Oregon Blomass Llquefaction Facllky"; Symposlum Papers Energy from Bbmass and Wastes VI, Lake Buena Vista. FP, 1982.