Abstract: An improvement in the process for making a dialkyl phosphorochloridothioate from P.sub.2 S.sub.5, alkyl alcohol and chlorine in which the desired product is separated from the reaction mixture by distillation, leaving an unstable, acidic residue, wherein the residue is stabilized and neutralized by reaction with an organic base, thereby enhancing the value of the residue while avoiding potential environmental damage caused by disposal of the residue.

Abstract: The invention is a process for preparing alkylidenebis(dibromophenol) comprising(a) dissolving alkylidenediphenol in between about 17 and 25 moles of methanol for each mole of alkylidenediphenol wherein the methanol has less than 5 percent by weight of water therein;(b) adding to the solution between about 4.0 and 4.1 moles of bromine per mole of alkylidenediphenol at an elevated temperature;(c) adding water to precipitate the alkylidenebis(dibromophenol) remaining in solution after the addition of the bromine in step (b) is completed; and(d) separating the alkylidenebis(dibromophenol) from the methanol solution.