One of the mysteries of the English language finally explained.
1A process for the industrial production of phenol in which benzene vapour is heated with hydrogen chloride and air over a copper-containing catalyst to yield chlorobenzene, which is then hydrolysed to yield phenol.
2A process for the industrial production of hydrazine from sodium hypochlorite and ammonia.
3A process for the industrial production of hydroxylamine in which ammonium nitrate is converted to hydroxylamine disulphonate and then to hydroxylamine sulphate.
1920s; earliest use found in Gas World.
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