| 摘要 |
<p>NOVEL RECOVERY PROCESS OF THE DISLCOSURE 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), triphenylphosphinetri(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. -A-</p> |
