GB522037A - Improvements in the destructive hydrogenation of carbonaceous materials and in dephenolising waste water - Google Patents

Abstract

522,037. Recovering phenols from waste waters; destructive hydrogenation. POTTS, H. E. (Naamlooze Vennootschap Internationale Hydrogeneeringsoctrooein Maatschappij.) Dec. 3, 1938, No. 35248. [Class 32] [Also in Group IV] Waste waters containing phenols are dephenolised by injecting the waste water into the high pressure circulation system of a destructive hydrogenation plant at a point behind the reaction vessel, the phenolic substance being dissolved in the hydrogenation products and thus extracted from the water. The water mav be that obtained in the destructive hydrogenation reaction itself, or waste water obtained in the low temperature carbonisation of hydrogenation residues. The water is preferably added at such points in the system where congestion is liable to occur owing to the deposition of salts. In a destructive hydrogenation plant comprising a reactor 1. hot catch pot 4, cooler 6, and cold catch pot 7, the condensate collecting in the pot 7 is passed through a pressure release valve 10 to a separator 11 where water is removed through line 12 and then distilled with steam in a tower 14 the vapours passing through a cooler 17 to vessel 18 where water is separated. The sludge from the hot catch pot 4 is returned in part through line 25 to reaction vessel 1, the remainder after release of pressure being carbonized in the low temperature plant 27, and the vapours evolved condensed in cooler 29 and separated from water in separator 30. The water drawn off from separators 30, 18 is pumped by pumps 19, 33 through lines 34, 20 and injected through line 21 into the line 5 between the catch pot 4 and cooler 6. Extraneous water may be injected through line 35.