We don't have synonyms for sulphating yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are sulphuring, sulphatic and sulfating.
(n) :
(Commonwealth) Alternative spelling of sulfate. [(organic chemistry) Any salt or ester of sulfuric acid.]
(v) :
(Commonwealth) Alternative spelling of sulfate. [(American spelling, transitive, chemistry) To treat something with sulfuric acid, a sulfate, or with sulfur dioxide.]
(n) :
(Commonwealth) Alternative spelling of sulfate. [(organic chemistry) Any salt or ester of sulfuric acid.]
(v) :
(Commonwealth) Alternative spelling of sulfate. [(American spelling, transitive, chemistry) To treat something with sulfuric acid, a sulfate, or with sulfur dioxide.]