乙炔在Hg SO_4~■-稀H_2~■SO_4~■液作用下,水合生成乙醛的实验方法,由于本身的缺点,较少在实验中采用,更少用于演示。本人采用一支试管,既发生乙炔又同时使乙炔和水蒸气一起与催化剂磷酸接触,在250—400℃温度下,直接水合生成乙醛。本实验可作演示实验、学生实验,也可用于定性实验中的少量制备。 The experimental method of acetylene hydration to produce acetaldehyde under the action of Hg SO_4~■- dilute H_2~■SO_4~■ liquid, due to its own shortcomings, is less used in experiments and less used for demonstration. I use a test tube, both acetylene and acetylene and water vapor together with the catalyst phosphoric acid, in the 250-400 °C temperature, direct hydration to produce acetaldehyde. This experiment can be used as a demonstration experiment, a student experiment, or a small amount of preparation in a qualitative experiment.