Process for reducing the chlorine content of organotetraphosphites

1. Process for reducing the chlorine content in an organotetraphosphite of one of the formulae III, IV, V, VI, VII, VIII, IX, X, XI, XII, XIII, XIV and XV:

comprising the following process steps:

a) contacting the organotetraphosphite with a solution comprising at least one solvent and at least one base, where the at least one solvent is selected from acetonitrile, ethyl acetate, ethanol, propanol, toluene,

b) adjusting the temperature to a value in the range from −20° C. to +15° C.,

c) removing the purified organotetraphosphite.

2. Process according to claim 1 ,

wherein the solution with which the organotetraphosphite is contacted in step a) contains, as well as the at least one solvent and the at least one base, also max. 5% water based on the solvent content.

3. Process according to claim 1 ,

wherein the at least one base is selected from triethylamine and dimethylaminobutane.

4. Process according to claim 1 ,

wherein the organotetraphosphite used in process step a) has a chlorine content of 1500 ppm to 100 000 ppm.

5. Process according to claim 1 ,

wherein the purified organotetraphosphite has a chlorine content of <1000 ppm.

6. Process according to claim 2 ,

wherein the at least one base is selected from triethylamine and dimethylaminobutane.

7. Process according to claim 2 ,

wherein the organotetraphosphite used in process step a) has a chlorine content of 1500 ppm to 100 000 ppm.

8. Process according to claim 3 ,

wherein the organotetraphosphite used in process step a) has a chlorine content of 1500 ppm to 100 000 ppm.

9. Process according to claim 2 ,

wherein the purified organotetraphosphite has a chlorine content of <1000 ppm.

10. Process according to claim 3 ,

wherein the purified organotetraphosphite has a chlorine content of <1000 ppm.

11. Process according to claim 4 ,

wherein the purified organotetraphosphite has a chlorine content of <1000 ppm.