A process for preparation of
thiocyclam base and salt. A method of manufacturing N,N-dimethyl-1,2,3-trithian-5-ylainine
hydrochloride is described including the steps of: providing a mixture of
thiosulfuric acid S, S′[2-(dimethylamino) trimethylene] ester monosodium salt and
sodium hydroxide; adding an aqueous
saline solution to the mixture of
thiosulfuric acid S, S′-[2-(dimethylamino) trimethylene] ester monosodium salt and
sodium hydroxide; separating the phases of the mixture; collecting the solids from the mixture using
filtration; washing the solids with
organic solvent; and
drying the solids, where the dried solids are methyl-1,2,3-trithian-5-ylamine
hydrochloride, and where the yield of the N,N-dimethyl-1,2,3-trithian-5-ylamine
hydrochloride is increased by incorporation of a body charge of diatomaceous earth into the
saline addition step, forming a mixture of the diatomaceous C earth with the composition of this step, and filtering the charged mixture through a diatomaceous earth media prior to the separation step.