| 摘要 |
<p>26982-22 In a method for producing diesel fuel in which a middle oil originating from coal is extracted as a preliminary product for the subsequent further treatment in a refining and hydrocracking stage with extraction of diesel fuel by a) hydrogenating coal liquefaction in the presence of rubbing oil (mashing oil) originating from the process, hydrogenous circulating gas and fine-particle catalyst (bottom phase), b) separation of the non-liquefied solids from the bottom phase in a hot separator at approximately the same temperatures and pressures as in the liquefaction reactor, c) condensation of the vaporous top product of the hot separator in an intermediate and a cold separator with simultaneous recovery of the circulating gas, and with a constant total oil yield from the coal, the portion of middle oil and in particular the portion of middle oil that can be used as diesel fuel is increased by d) feeding the condensate from the intermediate and the cold separator to a distillation column operating at atmospheric pressure and there dividing it into the four boiling steps section I below 180.degree.C boiling section II between 180 and 250.ANG.C boiling section III between 250 and 350.degree.C boiling and section IV above 350.degree.C boiling and by e) using sections II and IV as rubbing oil, section I as coal light oil to be processed further and section III as a preliminary product for the subsequent further treatment with extraction of diesel fuel. In this way the yield of middle oil, and thus the yield of diesel oil from the middle oil, can be increased without affecting the total oil yield from the coal. ZV 6 Kae/Kr P 34 20 197.1</p> |
