Acetic anhydride

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In order to dehydrate sodium acetate is placed in a shallow iron or nickel dish and heated over a free flame. Sodium acetate first melts and on further heating the mass solidifies. In order to remove the last portions of the water, the salt is heated further with a large flame, until the solidified mass melts for the second time. To 70 grams of finely pulverized, anhydrous sodium acetate are placed in round bottom flask equipped with dropping funnel and distillation condenser connected with receiving flask protected from moisture with calcium chloride tube. As soon as the first half of the chloride is added, the reaction is interrupted for a short time, in order that the pasty mass may be stirred up with a glass rod. The second half of acetyl chloride is then added. In such case, the fraction is poured back into the funnel and again allowed to act on the sodium acetate. Also, if the reaction is too rapid it can be cooled with ice-cold water. The yield of acetic anhydride is about 50 grams. From practical point of view it is not necessary for the preparation of acetic anhydride isolate the acetyl chloride ; it is better to allow acetyl chloride to act directly on an excess of the anhydrous sodium acetate , so that from the phosphorus oxychloride and anhydrous sodium acetate the acetic anhydride is directly obtained:. Preparation of acetic anhydride from phosphorus oxychloride. Preparation of acetic anhydride from acetic acid and oxalyl chloride. Oxalyl chloride and oxalyl bromide as reagents in organic chemistry, L. I found it rather difficult to seperate the acetic chloride from the end mixture, even after distillation Any help? Your email address will not be published. The preparative procedures provided by PrepChem. Although all syntheses are based on scientific literature with the citations to the original source, PrepChem. Preparation of acetic anhydride. Synthesis of acetic formic anhydride Synthesis of butyric anhydride Synthesis of propionic anhydride Synthesis of succinic anhydride Synthesis of cinnamic anhydride. Leave a Reply Cancel reply Your email address will not be published.

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Acetic anhydride