Proper noun
the Leblanc process
(chemistry, historical) An early industrial method of producing sodium carbonate. It involved two stages: production of sodium sulfate from sodium chloride, followed by reaction of the sodium sulfate with coal and calcium carbonate to produce sodium carbonate.
By 1814 the Leblanc process of making alkali from common salt was introduced to Britain. Source: Internet
The process was an improvement over the earlier Leblanc process. Source: Internet