Abstract: The catalytic activities of some heteropolyacids(HPAs) in synthesizing butyl-acrylate are reported. It has been demonstrated that 12-tungstophosphoric acid is the most effective catalyst among more than 20 HPA(salts). Various factors concerned in this reaction have been investigated. The optimum conditions have been found, that is, the molar ratio of alcohol to acid is 1.2∶1.0 , the catalyst concentration 1%(mass fraction), the reaction time 2 h, the temperature 98—124 ℃ and a certain amount of polymerization inhibitor exists.

Key words: n-Butyl-acrylate, Acrylic acid, n-Butyl alcohol, Heteropolyacid