1047.    FISCHER, F., TROPSCH, H., AND TEB-NEDDEN, W.  [Synthesis of Paraffin Hydrocarbons of High Molecular Weight From Carbon Monoxide.]  Ber. Deut. Chem. Gesell., vol. 60B, 1927, pp. 1330-1334; Chem. Abs., vol. 21, 1927, p. 2870.

        It has already been mentioned that in the preparation of petroleum hydrocarbons from CO solid paraffin hydrocarbons are found in the contact substances (abs. 1020).  In 1 of the usual contact substances, which had been treated for a long time with water gas under 10 atm., there were formed, together with the liquid and solid products, which distilled off with the current of water gas, considerable amounts of nonvolatile compounds, and when the experiment was continued, a long time, the contact mass increased greatly in weight, and on opening the contact tube, it was found to contain a mass that was solid at room temperature and became semiliquid on warming; on distillation in vacuo large amounts of solid paraffin passed over.  A part of the product was so difficultly volatile, however, that it was necessary to extract the contact mass with solvents (C₆H₆, xylene).  A partial separation was effected into a less soluble fraction melting 104°-117°, solidifying 109°.  Its composition, solidification point, and molecular weight all showed conclusively that it consisted of paraffin hydrocarbons of high molecular weight, around 1,000 or about C₇₀.