The industrial manufacture of dicamba diolamine follows the same broad pattern used for other amine salts of phenoxy- and benzoic-acid herbicides: first produce purified dicamba acid, then convert it into the desired amine salt under tightly controlled neutralisation conditions. The upstream steps mirror standard dicamba production, constructing the dimethyl-chlorobenzoic acid core through halogenation and methylation chemistry, followed by carboxylation and purification to yield technical-grade dicamba acid. To form the diolamine salt, the acid is dissolved or slurried in a suitable solvent and reacted with diolamine at a defined pH and temperature to ensure complete salt formation without excess free amine or unreacted acid.
