Patent GB-458667-A (GB)
Title: Process for the production of hydrocarbon products by treatment with hydrogenating gases of distillable carbonaceous materials and apparatus therefor
IPC: B01J19/02
Filed: 1935-04-15
Abstract: In the production of hydrocarbon products by the treatment of carbonaceous materials with hydrogenating gases, e.g. the destructive hydrogenation of coal, &c. those parts of the apparatus which are liable to corrosion and come into contact at 250 DEG  C. or over with reagents containing sulphur are made of a constructional material which is stable to hydrogen and is provided with a protective layer of cadmium or cadmium alloy by treating the parts with cadmium or cadmium alloy at elevated temperatures.  The apparatus may be made of an alloyed steel containing 1--8 per cent chromium with or without additions of molybdenum, aluminium, tungsten, vanadium, cobalt, manganese, or nickel.  The cadmium may be alloyed with copper, silver, iron and zinc, or iron and tin.  The protective layer is obtained by embedding the part in cadmium powder mixed with sand, alumina, &c., and heating to 500--900 DEG  C. preferably in the presence of an inert gas or by exposing the parts for twenty-four hours to cadmium vapour in a closed vessel maintained under 2--5 atmos. pressure and at 500--900 DEG  C., preferably first at 600 DEG C. and then at 800 DEG  C.  Air may be removed from the vessel by oxidation, by burning magnesium, or by displacement with an inert gas, e.g. nitrogen or with hydrogen.  Brown coal carbonization tar containing 1,6 per cent sulphur is treated at 450 DEG  C. with hydrogen under 250 atmos. pressure in a vessel made of a steel containing 5,5 per cent chromium, 1,6 per cent nickel and 0,1 per cent carbon and coated with iron cadmium alloy by exposure to cadmium vapour for 24 hours at 850 DEG  C.  Specification 277,273, [Class 32], is referred to.ALSO:In the production of hydrocarbon products by the treatment of carbonaceous materials with hydrogenating gases, e.g. the destructive hydrogenation of coal &c., those parts of the apparatus which are liable to corrosion and come into contact at 250 DEG  C. or over with reagents containing sulphur are made of a constructional material which is stable to hydrogen and is provided with a protective layer of cadmium or cadmium alloy by treating the parts with cadmium or cadmium alloy at elevated temperatures.  The apparatus may be made of an alloyed steel containing 1-8 per cent chromium with or without additions of molybdenum, aluminium, tungsten, vanadium, cobalt, manganese, or nickel.  The cadmium may be alloyed with copper, silver, iron and zinc, or iron and tin.  The protective layer is obtained by embedding the part in cadmium powder mixed with sand, alumina, &c. and heating to 500-900 DEG  C. preferably in the presence of an inert gas or by exposing the parts for twenty-four hours to cadmium vapour in a closed vessel maintained under 2-5 atmos. pressure and at 500-900 DEG  C., preferably first at 600 DEG  C. and then at 800 DEG  C.  Air may be removed from the vessel by oxidation, by burning magnesium, or by displacement with an inert gas, e.g. nitrogen or with hydrogen.  Brown coal carbonization tar containing 1,6 per cent sulphur is treated at 450 DEG  C. with hydrogen under 250 atmos. pressure in a vessel made of a steel containing 5,5 per cent chromium, 1,6 per cent nickel and 0,1 per cent carbon and coated with iron cadmium alloy by exposure to cadmium vapour for 24 hours at 850 DEG  C.  Specification 277,273, [Class 32], is referred to.