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 1633.    ---------------.  [JONES, J. P.]  Some Solvent-Extraction Developments in Germany.  II.  Nat. Petrol. News, Tech. Sec., vol. 38, 1946, pp. R181, 182, 184.  CIOS Rept. XXXI-85, 1945, 73 pp. PB 1850.

        Second part of this report discusses the separation of low-temperature carbonization tar distillate into raffinate and extract by means of SO2 and the use of naphtha to separate the extract.  Also described is the use of triangular coordinate graphs to supply data on the relationship between solvent, raffinate and extract phases necessary for commercial operations.