BAD FUER ELEKTRODENLOSE VERKUPFERUNG

摘要

Bath contg. a water-sol. Cu salt, a cpd. forming a complex with Cu, an alkali metal hydroxide and formaldehyde, is improved by the addn. of a sulphite, pref. 1-10 g/l or Na2SO3, K2SO3, (NH4)2SO3 or NaH2O3. The sulphite inhibits noncatalyst reactions which otherwise occur in the bulk of the soln. at higher concns. and temps. so that the process can be intensified.