The sketch shows an outline of what was being manufactured at ICI Billingham in 1939. But the same processes would have been used up to the 1950s. As originally set up, Billingham ‘synthesised’ ammonia using the Haber Bosch process, in which a key feature was the production of hydrogen and nitrogen from water and producer gas units. Billingham at this time was a glorified gasworks. The ammonia was mainly used for fertiliser as ammonium sulphate, by reacting it with sulphuric acid. The sulphuric acid came from the use of anhydrite, that had been fortuitously discovered to lie beneath the ICI site. But the ammonia could also be used to make nitric acid and urea. Drikold was solid carbon dioxide, or dry ice, which was a byproduct from making the hydrogen and nitrogen.
More complex fertilisers could be made by bringing in potash and phosphate rock. I would guess that these would need to be imported at the time. The chalk would have come by rail from the south. And as mentioned recently Billingham was making petrol from coal, but creosote was also being used as it greatly increased the output. Some of this probably came from the gasworks on site.
Every pupil at Richard Hind Boys in the 1950s will remember the chemistry master, Mr Dee, explaining how the Stocktonian name for ICI Billingham, the ‘Synthetic’, had come about from its use of the Haber Bosch process.
Image and details courtesy of Fred Starr.