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糠醛和丙酮的连续缩合反应是在一附有冷却夹套,搅拌器,温度计和液面调整漏斗的φ45×700mm 玻璃管内进行。当催化混合液中氢氧化钠浓度为2.0—1.0%,催化混合液中丙酮浓度维持在为其起始浓度的43—56%,温度在25—30℃,将1∶1克分子比例的糠醛——丙酮混合液以9—11ml./分的速度连续输入反应管内进行反应则糠叉丙酮产率可维持在66—72.9%。在其中维持丙酮在催化混合液中的一定浓度是重要的。糠叉丙酮通过与次氯酸钠(有效氯含量约10%)以1∶3.2克分子比例进行反应,温度在65°—75℃,则呋喃丙烯酸产率为80—82%,氯仿回收率为理论产率的54%。
The continuous condensation of furfural and acetone was carried out in a φ45 × 700 mm glass tube with cooling jacket, stirrer, thermometer and level adjusting funnel. When the concentration of sodium hydroxide in the catalyst mixture is 2.0-1.0%, the concentration of acetone in the catalytic mixture is maintained at 43-56% of its initial concentration and the temperature is 25-30 ° C. A 1: 1 molar ratio of furfural - acetone mixture was continuously fed into the reaction tube at a rate of 9-11ml./minute to carry out the reaction, and the yield of the furfuryl acetone could be maintained at 66-72.9%. It is important to maintain a certain concentration of acetone in the catalytic mixture therein. The reaction of furfuryl acetone with 1: 3.2 molar ratio of sodium hypochlorite (effective chlorine content of about 10%) at a temperature of 65 ° -75 ° C yields furan acrylic acid of 80-82% and the chloroform recovery is the theoretical yield Of the 54%.