Method for reducing the chlorine content of organomonophosphites using dimethylaminobutane, triethylamine or triethanolamine

A process for reducing the chlorine content in an organomonophosphite of one of the general formulae I, II, III, IV, V, VI, VII, VIII, IX and X:

• where the radicals R1, R2, R3, R4, R5, R6, R7, R8, R21, R22, R23, R24, R25, R31, R32, R33, R34, R35, R41, R42, R43, R44 and R45 are selected each independently from:
• —H, —(C1-C12)-alkyl, —O—(C1-C12)-alkyl, —O—(C6-C20)-aryl, —(C6-C20)-aryl,
• and R10 is —(C1-C12)-alkyl;
• and T is selected from:
• —CH3, —CF3, —CH2C6H5;
• and Q is selected from:
• —(C1-C12)-alkyl-, —C(CH3)3;
• and V is selected from:
• —CH2CH2COCH3, —C(CH3)3, —CH6H5;
• and W is selected from:
• -Me, —CH2CH3, —CH2CH2CH3, —CH2-cyclo-C3H5, —CH(CH3)2, -cyclo-C6H11, —C(CH3)3, —CH2C6H5, —CH2C6H3-2,4-(CH3)2;
• and X and Y are each independently selected from:
• —(C1-C12)-alkyl, —(C6-C20)-aryl, —(C6-C20)-aryl-(C1-C12)-alkyl, —(C1-C12)-alkyl-(C6-C20)-aryl;
• and Z is selected from:
• —(C1-C12)-alkyl-, —(C6-C20)-aryl-, —(C6-C20)-aryl-(C6-C20)-aryl-;
• and the alkyl, cycloalkyl, and aryl groups mentioned may be substituted;
• comprising the process steps of:
• a) partly or fully dissolving the organomonophosphite in a first solution comprising a first solvent selected from aromatics, alcohols, acetone, ethyl acetate, acetonitrile, ether, water;
• where the first solution comprises dimethylaminobutane or triethylamine or triethanolamine;
• c) the purified organomonophosphite is precipitated.