GB332336A - Improvements in the working up of distillable carbonaceous liquids containing substances of high molecular weight - Google Patents

Abstract

332,336. Johnson, J. Y., (I. G. Farbenindustrie Akt.-Ges.). May 15, 1929. Hydrogenation, destructive. - In obtaining valuable hydrocarbon products from carbonaceous liquids containing substances of high molecular weight, the latter are removed from the liquids by adsorbents, and are destructively hydrogenated together with the adsorbents at elevated temperatures and pressures. The treatment with adsorbents may be carried out at ordinary or elevated temperatures, and the treated liquid mav be worked up further in any desired manner. Suitable adsorbents are silica gel and alumina gel; preferably the adsorbent should also be a destructive hydrogenation catalyst, such as molybdic acid, or alternatively should be impregnated with such a catalyst. The adsorbent may be used in a colloidal state. After the destructive hydrogenation the adsorbent may be regenerated and used again. In an example, a middle oil containing 7 per cent of constituents boiling between 325‹ C. and 350‹ C. and 5 per cent boiling above 350‹ C. is treated at 70-80 C‹. with a silica adsorbent which has been made catalytic by impregnation with a solution of the nitrates of molybdenum and zinc, followed by heat treatment. The middle oil is separated by centrifuging from the adsorbent and is destructively hydrogenated at 440-450‹ C. and under a pressure of 200 atmospheres of hydrogen in the presence of a catalyst containing molybdic and chromic acids. The activity of the catalyst remains practically unimpaired, whereas, without the preliminary treatment with adsorbent, poisoning occurs rapidly. The adsorbent and adsorbed substances are treated with hydrogen at 460‹ C. and 200 atmospheres. and the low-boiling products formed are returned to the main process. The adsorbent is preferably regenerated by heating for re-use.