Patent GB-140394-A (GB)
Title: Improvements in and relating to the production of nitrogen compounds
IPC: C01C3/00
Filed: 1920-03-15
Abstract: Ammonia cyanogen, hydrocyanic acid, &c. are prepared from gas mixtures containing nitrogen,-for instance nitrogen, a hydrocarbon, or carbon monoxide, and hydrogen, or ammonia and acetylene,-by passing the gas mixture over a nitrogenous catalyst, formed by heating a normal cyanide in an atmosphere containing nitrogen such as barium cyanamide, prepared in a porous form as described below, or a cyanamide of titanium, vanadium, tungsten, uranium, nickel, manganese, chromium, &c., or a body prepared by heating an alkali cyanide with nitrogen, hydrogen, and carbon, or a mixture of porous barium cyanamide with a cyanamide of the above metals.  The barium cyanamide is produced by heating barium cyanide in nitrogen at about 400 -500 DEG  C.  When a mixed catalyst is used, it is preferred to make it by heating a mixture of the metal cyanides with barium cyanide, chromium and uranium cyanides being mentioned.  It is also stated that nickel cyanide is converted into a cyanamide by the same process, but the product is not in porous form.  When barium cyanamide is not used in the catalyst, a carrier is preferably used; for instance, the catalyst obtained from alkali cyanide may be supported on asbestos, kieselguhr, or coke.  The Specification as open to inspection under Sect. 91 (3) (a) states also that the catalyst employed may be a cyanide or other compound such as a hydride of any of the metals mentioned, or the free metals and the compounds obtained may be compounds of nitrogen with one or more other elements.  This subject-matter does not appear in the Specification as accepted.ALSO:Compounds of nitrogen with carbon or hydrogen or both, such as cyanogen, hydrocyanic acid, and ammonia, are prepared from gas mixtures containing nitrogen, for instance nitrogen, a hydrocarbon or carbon monoxide, and hydrogen, or ammonia and acetylene, by passing the gas mixture over a nitrogenous catalyst formed by heating a normal cyanide in an atmosphere containing nitrogen, such as barium cyanamide, prepared in a porous form as described below, or a cyanamide of titanium, vanadium, tungsten, uranium, nickel, manganese, chromium, &c., or a body prepared by heating an alkali cyanide with nitrogen, hydrogen, and carbon, or a mixture of porous barium cyanamide with a cyanamide, of the above metals. The barium cyanamide is produced by heating barium cyanide in nitrogen at about 400-500 DEG  C.  When a mixed catalyst is used, it is preferred to make it by heating a mixture of the metal p  cyanides with barium cyanide, chromium and uranium cyanides being mentioned. It is also stated that nickel cyanide is converted into a cyanamide by the same process, but the product is not in porous form.  When barium cyanamide is not used in the catalyst, a carrier is preferably used; for instance, the catalyst obtained from alkali cyanide may be supported on asbestos, kieselguhr, or coke.  The production of hydrocyanic acid, cyanogen, &c. may be effected at atmospheric pressure, but is preferably effected under pressure, pressures of 100-1000 lb. being mentioned.  The temperature should not be such as to fuse the catalyst.  The Specification as open to inspection under Sect. 91 (3) (a) states also that the compounds obtained may be compounds of nitrogen with one or more other elements, and the catalysts employed may be a cyanide or other compound such as a hydride of any of the metals mentioned or the free metals.  This subject-matter does not appear in the Specification as accepted. Reference has been directed by the Comptroller to Specification 143,550, [Class 1 (i), Chemical processes &c.]