GB407127A - Improved process for the treatment with hydrogenating gases of distillable carbonaceous materials - Google Patents

Abstract

In the treatment of distillable carbonacous materials containing at least three carbon atoms in the molecule with hydrogen at elevated temperatures and preferably under pressure, the carbonaceous materials and a catalyst containing rhenium are passed together with the hydrogenating gases through the reaction vessel. The rhenium catalyst may be applied to the material in solution, as a colloidal suspension, or the material may be impregnated therewith. Rhenium sulphides, oxides, halides, or perrhenates are mentioned and the rhenium compound may be applied to a carrier, e.g. florida earth, active carbon or coke activated by steam or acids. Regeneration of the catalyst may be obtained by the addition of liquid oxidising agents, e.g. nitric acid. Naphthalene mixed with rhenium sulphide prepared as described below is passed with hydrogen through a vessel maintained at 440 DEG C. and 180 atmospheres pressure. A liquid hydrogenated product is obtained containing decahydro and tetrahydronaphthalene. Benzene is similarly converted to cyclohexane. Cylinder oil is treated with molybdic acid and rhenium heptasulphide absorbed on active carbon and a lubricating p oil boiling above 360 C. is obtained, while cresol is converted into benzines in presence of rhenium disulphide. Rhenium disulphide is obtained by dissolving potassium perrhenate in water and passing in hydrogen sulphide slowly. The solution is acidified with hydrogen chloride and the black precipitate of the heptasulphide is further treated in a tube at 400 DEG C. with hydrogen sulphide to convert it into the disulphide. The treatment may take place in the presence of active carbon. Specifications 379,587 and 379,755 are referred to.ALSO:In the treatment of distillable carbonaceous materials containing at least three carbon atoms in the molecule with hydrogen at elevated temperatures and preferably under pressure, the carbonaceous materials and a catalyst containing rhenium are passed together with the hydrogenating gases through the reaction vessel. The rhenium catalyst may be applied to the material in solution, as a colloidal suspension, or the material may be impregnated therewith. Rhenium sulphides, oxides, halides, or perrhenates are mentioned and the rhenium compound may be applied to a carrier, e.g. florida earth, active carbon or coke activated by steam or acids. Regeneration of the catalyst may be obtained by the addition of liquid oxidizing agents, e.g. nitric acid. Naphthalene mixed with rhenium sulphide prepared as described below is passed with hydrogen through a vessel maintained at 440 DEG C. and 180 atmospheres pressure. A liquid hydrogenated product is obtained containing decahydro and tetrahydronaphthalene. Benzene is similarly converted to cyclohexane. Cylinder oil is treated with molybdic acid and rhenium heptasulphide absorbed on active carbon and a lubricating oil boiling above 360 DEG C. is obtained, while cresol is converted into benzines in presence of rhenium disulphide. Rhenium disulphide is obtained by dissolving potassium perrhenate in water and passing in hydrogen sulphide slowly. The solution is acidified with hydrogen chloride and the black precipitate of the heptasulphide is further treated in a tube at 400 DEG C. with hydrogen sulphide to convert it into the disulphide. The treatment may take place in the presence of active carbon. Specifications 379,587, and 379,755, [Group III], are referred to.