| 摘要 |
A process for the manufacture of alkali metal salt of Sorbic acid or free Sorbic acid by oxidation of 2:4 hexadienal with an aqueous solution of Hydrogen Peroxide and adding oxides of transition metal such as Mn, Ni, Cu, Ag, Pt, or Pd. In a reactor maintaining the temperature in the range of 5 deg.-80 deg.C., preferable between 20 deg. to 40 deg. thus converting the metal salt to free Sorbic acid by acidification. Molar proportions of 2:4 hexadienal and an aqueous alkali metal hydroxide are 1:2:1 and these are fed to reactor containing catalyst and continuously blowing the mixture. Catalysts used in the process are oxides of transition metals or salts of Li, Na, or Ca. The mixture in the reactor kept alkaline using calcium hydroxide or ammonium hydroxides. Potassium hydroxide or ammonium hydroxides.
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