Method for preparing butanedione through oxidating acetylmethylcarbinol
A technology of acetoin and diacetyl, applied in the field of oxidation of acetoin to diacetyl, can solve the problems of high production cost, rare raw materials, difficult purification of products, etc., and achieve low production cost, simple operation and high selectivity Effect
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[0012] The present invention will be further described in detail below in combination with the technical scheme and the best embodiment.
[0013] Add 220 g (2.5 mol) of acetoin, 500 ml of water and 1360 g of hexahydrate crystalline ferric chloride (5.0 mol) in a 3-liter three-necked flask equipped with mechanical stirring, dropping funnel, fractionating column and condenser. The mixture was heated to 100°C, and diacetyl was collected until there was no distillate. The water layer of the distillate was removed, and the oil layer was dried with calcium chloride and rectified to obtain 161 grams of diacetyl. The purity of the product is not less than 99%, the refractive index is 1.3935, the boiling point is 88.0-88.5°C, and the yield is 75%.
[0014] Pour the still liquid ferrous chloride into the filter tank to filter. The sieve plate in the middle of the filter tank must be paved with small stones and sand, and then covered with filter cloth. The bottom of the tank should be ...
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