| 主权项 |
1. Process for reducing the chlorine content in an organobisphosphite of one of the general formulae I, II, III, IV, V and VI: where R1, R2, R3, R4, R5, R6, R7, R8, R9 are each independently selected from: —H, —(C1-C12)-alkyl, —O—(C1-C12)-alkyl, —O—(C6-C20)-aryl, —(C6-C20)-aryl, halogen, —COO—(C1-C12)-alkyl, —CONH—(C1-C12)-alkyl, —(C6-C20)-aryl-CON[(C1-C12)-alkyl]2, —CO—(C1-C12)-alkyl, —CO—(C6-C20)-aryl, —COOH, —OH, —SO3H, —SO3Na, —NO2, —CN, —NH2, —N[(C1-C12)-alkyl]2; and the four following pairs of radicals are not both the same radical in all four pairs: R1 and R5, R2 and R6, R3 and R7, R4 and R8; comprising the process steps of: a) partly or fully dissolving the organobisphosphite in a first solution, b) introducing the first solution into a second solution, which results in precipitation of the purified organobisphosphite, wherein the first solution comprises a first solvent and a first base, the second solution comprises a second solvent and a second base, and the first solvent is selected from: aromatics, alcohols, acetone, ethyl acetate, acetonitrile, ethers, the second solvent is selected from: aromatics, C5-C10-alkanes, alcohols, acetone, ethyl acetate, acetonitrile, ethers, the first base is selected from: amine bases, alkoxides, pyridine, pyridine derivatives, N-methyl-2-pyrrolidone, triethanolamine, the second base is selected from: amine bases, alkoxides, pyridine, pyridine derivatives, N-methyl-2-pyrrolidone, triethanolamine, and the organobisphosphite has better solubility in the first solvent than in the second solvent. |
