| 摘要 |
PURPOSE:To react a lower fatty acid with a lower olefin in the presence of a compound selected from the Cs salt, Rb salt, Tl salt, ammonium salt and K salt of tungstosilicic acid as a catalyst in a gaseous phase, when the lower fatty acid is esterified with the lower olefin to obtain the subject substance. CONSTITUTION:A lower fatty acid (e.g. acrylic acid) is made to react with a lower olefin (e.g. ethylene) in the presence of a compound selected from the Cs salt, Rb salt, Tl salt, ammonium salt and K salt of tungstosilicic acid as a catalyst at 100-250 deg.C in a gaseous phase of 2-10kg/cm<2> to obtain the subject substance (e.g. ethyl acrylate) in a good space time yield. In order to prolong the life of the catalyst, the reaction may be carried out in the presence of a suitable volume of water. The catalyst may be prepared by dissolving the tungstosilicic acid in a suitable volume of water, mixing the solution with the nitrate salt, carbonate salt, etc., of Cs, Rb, Tl ammonium or K in a form of powder or aqueous solution and subsequently evaporating the water from the reaction product. |
