About the conditions of hydroxylation, Petrović et al. (2003) patented the alcoholysis of epoxidized oils using fluoboric acid as a catalyst (48%, < 2%p/p) with different hydroxylated molecules like water, monoalcohols (methanol, ethanol, propanol and butanol) and their mixtures, using molar excess to avoid polymerization and products of higher viscosities. They obtained yields of 85-95% and hydroxyl numbers (OH numbers) of 110-213 mg KOH at 25-50°C, using molar relations between 1:1 and 10:1 of a mixture of alcohols (methanol and isopropyl alcohol with water) to epoxide group
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