A method to obtain imidazoline mixtures capable of providing considerable energy savings during the manufacture process due to a notable reduction of process temperature and lower requirements of chemical raw materials, and it allows for the direct use of vegetable oils, instead of fatty acids or their esters, producing imidazolines containing a (2-hydroxyethyl) group on position one of the ring and on position 2, a hydrocarbonated chain, from the fatty acids present in coconut oil, palm oil, jathrofa or castor. Likewise, the application of these mixtures as corrosion inhibitors has been established, in addition to quaternized imidazolines, which have applications as cationic surfactants, fabric softeners, hair conditioners and antistatic agents. It is an optimized method that compared to other known methods, uses substoichiometric proportions of aminoethylethanolamine and lower reaction temperatures, without using dehydrating agents or catalysts, or azeotropic distillation, which involves the use of highly flammable solvents.