PROCESS FOR PREPARING TRI(M-SULFOPHENYL)PHOSPHINE BY HYDROLYSIS AND CONTROLLED DILUTION OF THE SULFONATION MIXTURE

摘要

1. Process for the preparation of tri(m-sulphophenyl)phosphine (TPPTS) comprising a) a sulphonation of triphenylphosphine (TPP) by means of a H2 SO4 -SO3 mixture containing an excess of SO3 , b) a hydrolysis of the excess SO3 present in the sulphonate obtained under (a) in order to stop the sulphonation reaction and c) a dilution of the hydrolysate obtained under (b) in order to attain a H2 SO4 normality compatible with d) the final step of extraction of TPPTS, the said process being characterized in that the hydrolysis step (b) and at least a part of the dilution step (c) are carried out simultaneously by incorporating the sulphonate in an acid aqueous hydrolysis solution while maintaining the H2 SO4 normality during the hydrolysis at a value above 9 N and removing at least partly the heat produced, the temperature being below 20 degrees C.