Preparation of diethyl oxalate丨Shandong diethyl oxalate manufacturer

Preparation of diethyl oxalate: azeotropic dehydration at 68-70 under heating and reflux. After the water has basically evaporated, the ethanol and benzene evaporate. After cooling, wash with water, saturated sodium bicarbonate solution, wash with water, and dry with anhydrous sodium sulfate. Atmospheric distillation, collect fractions at 182 ~ 184 to obtain 1) 57 g of diethyl oxalate (1), with a yield of 78%. Note: (1) Anhydrous oxalic acid can be prepared by the following method: the powdered oxalic acid containing crystal water is heated to reflux with carbon tetrachloride, and azeotropically dehydrated to anhydrous evaporation. Filter, dry and store in a desiccator for later use. It can also be dried directly in an oven to prepare anhydrous oxalic acid. The corresponding amount of oxalic acid containing crystal water can also be used in this experiment, but the reaction time is longer. Preparation of diethyl oxalate丨Shandong diethyl oxalate manufacturer

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