Process for continuously preparing alkanolamin and/or alkylamin photosulfonates from fatty esters or petroleum paraffins, and alkanolamin and/or alkylamin photosulfonates so obtained

摘要

1. Process for the continuous preparation of alkanolamine and/or alkylamine photosulphonates from a starting material (1) constituted by fatty acid methyl esters or petroleum paraffins comprising the following steps : a) submitting the said starting material (1) to photosulphonation under anhydrous conditions by a mixture (3) of sulphurous anhydride and oxygen under ultraviolet irradiation ; b) degassifying the product (4) from stage a of the sulphurous anhydride which it contains ; the process being characterised in that it comprises in addition the following stages ; c) adding to the degassified product (8) obtained from stage b an amount of alkanolamine and/or alkylamine (10) greater than that strictly necessary for the neutralisation of the sulphonic acids contained in such a way as to separate the mixture thus obtained into two phases, a lighter phase called the raffinate (11) and a heavier phase called the extract (12) ; d) recycling to stage a the said raffinate (11) which contains unsulphonated starting material (1) ; e) recovering the said extract (12) which contains the alkanolamine and/or alkylamine polysulphonates.