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Process for the separation and purification of salts of diphenylphosphinephenyl-m-sulphonic acid, phenylphospine-di(m-phenylsulphonic acid) and/or triphenylphosphine-tri-(m-sulphonic acid)
Process for the separation and purification of salts of diphenylphosphinephenyl-m-sulphonic acid, phenylphospine-di(m-phenylsulphonic acid) and/or triphenylphosphine-tri-(m-sulphonic acid)
A process for the purification of salts of at least one member of the group consisting of diphenylphosphine-phenyl-m-sulfonic acid, phenylphosphine-di-(m-phenylsulfonic acid) and triphenylphosphine-tri-(m-sulfonic acid) from aqueous solutions thereof comprising adding at least a molar equivalent amount of at least one member of the group consisting of di-(n-pentyl)-amine, di-(n-hexyl)-amine and water-soluble salts of said amines to an aqueous solution containing at least one member of the group consisting diphenylphosphine-phenyl-m-sulfonic acid, phenylphosphine-di-(m-phenylsulfonic acid), triphenylphosphine-tri(m-sulfonic acid) and salts thereof to adjust the pH value to /=7, recovering the precipitate, washing the precipitate and dissolving the same in an aqueous basic solution.
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