Preparation of 2,2-dimethylolpropanoic acid

2,2-Dimethylolpropanoic acid was synthesized by the mixed aldol condensation and oxidation from formaldehyde and propaldehyde.A mixture of formaldehyde 2.4 mol,propaldehyde 1 mol and K2CO3 as catalyst at 35 ℃ was stirred for 10 h.Then H2O2 0.9 mol was added and the mixture was stirred at 95 ℃ for 10 h to obtain 2,2-dimethylolpropanoic acid.The yield of the product was 53.5% and the purity was over 99%.