954.    ---------------.  [FISCHER, F.]   [Synthesis of Aromatic Hydrocarbons From Methane at Atmospheric Pressure and Without Catalysts.]  Brennstoff-Chem., vol. 9, 1928, pp. 309-316; Chem. Abs., vol. 23, 1929, p. 2694.

      Pure CH4 from various sources and CH4 with other gases (coal gas) is decomposed by passage through porcelain or quartz tubes heated 900-1,200.  The tar formed is precipitated by a Cottrell precipitator, and light oils are absorbed by active charcoal.  The time of contact is fully as important as the temperature.  For example, 346 l. CH4 89% with 8% N2 passed through the 1-mm. annular space between concentric 14- and 16-mm. tubes 22 cm. long at 63 l. per hr. gave 7 gm. oil, 3 gm. tar, and 0.2 gm. C.  Higher temperatures with the same gas flow favor precipitation of C.  Tar and oil do not form to an appreciable extent below 900.  The tar is aromatic; naphthalene, anthracene, and phenethrene being isolated.  The oils contain mostly benzene with xylene and C10H8.  SiO2, W, Mo, and Sn as catalysts did not favor oil yields; Fe, Cu and graphite favored C precipitation.