Manufacture of hard carbon products from pitch

Abstract

Abstract 673,003. Treating pitch. C.D. PATENTS, Ltd. Sept. 12, 1950 [Oct. 4, 1949], No. 25547/49. Class 55 (ii). [Also in Group V] Moulded carbon bodies are prepared by dissolving pitch in a hydrocarbon solvent with agitation, adding, whilst agitation continues, sulphuric acid in excess of the amount necessary to obtain an agglutinating precipitate, washing the precipitate free from the excess sulphuric acid, adding one or more softening agents so that it becomes agglutinating and extrusible, and firing the extruded body with or without drying to a temperature higher than 1000‹ C. under non-oxidizing conditions and at a maximum rate of temperature rise whilst avoiding intumescence. Naphtha is specified as the solvent whilst the softening agents are middle oil, heavy oil and anthracene oil from coal tar, coal tar pitch, aromatic hydrocarbons or mixtures thereof, naphthenic hydrocarbons, heterocyclic compounds containing one nitrogen atom in the nucleus, petroleum residues, asphalt and soft bitumen 15 to 35 per cent of strong sulphuric acid is used. Specification 619,967 is referred to.

Inventors

• 👤 Charles Desmond Greaves
• 👤 William Duncan Parker

Bibliographic Details