This paper present the results of total acid hydrolysis of β–alkyl (C12H25/C18H37) polyethyleneoxy (n=3–20) propionitriles (I) in classical heterogeneous system and micellar catalysis conditions with dodecylbenzene sulphonic acid (III) and p-toluenesulphonic acid (II). Alkaline (Na, K) and ammonium salts (NH4; MEA; DEA; TEA) of the β–alkyl C12H25/C18H37) polyethyleneoxy (n=3–20) propionic acids (I) as valuable ionic-anionic surfaceactive components in hygiene receipts are also in agroalimentary processing.