Patent GB-359421-A (GB)
Title: Improvements in the removal of acetylene from gases
IPC: C10K3/00
Filed: 1930-05-16
Abstract: To remove acetylene contained as an impurity in gases containing hydrogen, the gases are passed at about 100-200 DEG  C., over a catalyst prepared from both chromium and nickel salts, oxides, or hydroxides, with or without other salts or oxides or hydroxides.  The acetylene is partly converted into ethane and partly polymerized. The gases which may be treated include coke oven gas, illuminating gas, low temperature carbonization gas, cracking gases, oil gas, waste gases from destructive hydrogenation, and gases obtained by the thermal and (or) electrical treatment of hydrocarbons such as methane, if desired after the bulk of the acetylene has been removed by other means. The catalysts may be deposited on carriers, a number of which are mentioned, and may contain up to 10 per cent of manganese, silver, copper gold, uranium, vanadium, titanium, thallium, zirconium, aluminium, tin, lead, bismuth, mercury, or metals of the platinum group, or salts, oxides or hydroxides of any of these metals, or alkalies, alkaline earths, or rare earths.  The process is preferably effected at atmospheric pressure, but reduced or raised pressure may also be applied.  According to the examples, (1) a low-temperature carbonization gas freed from carbon dioxide and hydrogen sulphide is led at 100 DEG  C. over a catalyst prepared by calcining a mixture of nickel nitrate and chromic anhydride, and reducing the product with hydrogen; (2) hydrogen obtained by thermal decomposition of methane is led a 100 DEG  C. over a catalyst prepared by calcining a mixture of pyrolusite, chromic anhydride, nickel nitrate and silver nitrate, and reducing the product with hydrogen; (3) cracking gas is led at 105-200 DEG  C. over a catalyst prepared from chromium trioxide and nickel nitrate. Specifications 300,294 and 314,432, [both in Class 1 (i), Chemical processes &c.], are referred to.ALSO:To remove acetylene from gases containing it as an impurity, the gases are passed at about 100-200 DEG  C. over a catalyst prepared from both chromium and nickel salts, oxides, or hydroxides, with or without other salts or oxides or hydroxides. When the gases treated contain hydrogen, the acetylene is partly converted into ethane and partly polymerized; in other cases it is removed by polymerization alone.  The gases which may be treated include coke oven gas, illuminating gas, low-temperature carbonization gas, cracking gases, oil gas, waste gases from destructive hydrogenation, and gases obtained by the thermal and (or) electrical treatment of hydrocarbons such as methane, if desired after the bulk of the acetylene has been removed by other means. The catalysts may be deposited on carriers, a number of which are mentioned, and may contain up to 10 per cent of manganese, silver, copper, gold, uranium, vanadium, titanium, thallium, zirconium, aluminium, tin, lead, bismuth, mercury, or metals of the platinum group, or salts, oxides or hydroxides of any of these metals, or alkalies, alkaline earths, or rare earths.  The process is preferably effected at atmospheric pressure, but reduced or raised pressure may also be applied.  According to the examples, (1) a low-temperature carbonization gas freed from carbon dioxide and hydrogen sulphide is led at 100 DEG  C. over a catalyst prepared by calcining a mixture of nickel nitrate and chromic anhydride, and reducing the product with hydrogen; (2) hydrogen obtained by thermal decomposition of methane is led at 100 DEG  C. over a catalyst prepared by calcining a mixture of pyrolusite, chromic anhydride, nickel nitrate and silver nitrate, and reducing the product with hydrogen; (3) cracking gas is led at 150-200 DEG  C. over a catalyst prepared from chromium trioxide and nickel nitrate.  Specifications 300,294 and 314,432, [both in Class 2 (iii), Dyes &c.], are referred to.