Chemical engineering

John Holker

John Holker (1719 – 27 April 1786) was a Jacobite soldier, industrialist, and one of the world’s first industrial espionage agents, born in Stretford, England, to blacksmith John Holker and his wife Alice.

Stretford process

The Stretford process was developed during the late 1950s to remove hydrogen sulfide (H2S) from town gas. It was the first liquid phase oxidation process for converting H2S into sulfur to gain widespread commercial acceptance.


Tapputi-Belatekallim (fl. 1200 BCE) was a Babylonian chemist and a royal perfume maker.