Patent ID: 9650401
Date: 2017-05-16
CPC Classifications: C07F

Claim:
1. Process for reducing the chlorine content in an organobisphosphite of one of the general formulae I, II, III, IV, V and VI: where R and the four following pairs of radicals are not both the same radical in all four pairs: R 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.