24.03.1942 (82 years)
Prof Robert Simpson Silver CBE FRSE FIP MIME (1913–1997) was a Scottish physicist and mechanical engineer, awarded the Unesco Prize for Science in 1968 for his discovery of a process for the demineralisation of sea water. Prior to his work there had been no commercially viable desalination process that involved continuous flow; plants had to be stopped and emptied of accumulated salt from time to time, such as when a passenger liner using desalination was in port. Silver performed a thermodynamic analysis (now known as "Second Law Analysis") showing that reverse osmosis and "multi-stage flash" were the optimal processes for purification of water. As reverse osmosis technology was less advanced in the mid-20th century he designed multi-stage flash equipment, of which the first operational large-scale installation was in Kuwait. Silver was also a poet and playwright whose work was performed at the Edinburgh Festival.