Soybean Oil for Enhanced Deinking of Litho Prints

Three soy-based oils were characterized by saponification and acid number values. The saponification procedure, in which the soy oils were boiled in diluted 0.1N KOH and titration of non-consumed KOH allowed identifying the amount of free and bound acid groups in tested oils, while acid number allowed determining the amount of free acid groups in soy oils. Free fatty acids were extracted from tested soy-oils and were utilized in flotation deinking of litho-printed paper substrates. The effect of each of the soy-oil byproducts on deinking was observed, quantified and compared with standard INGEDE 11p procedure that employ commercially available oleic acid.