Assertion: acetic anhydride | /r/HasProperty | difficult
Facets:
value: to separate the acetic anhydride
type: PURPOSE
Source sentences:
text: When acetic anhydride is used to acetylate methyl lactate, it is difficult to effect a thorough and satisfactory separation of the acetylation product, methyl alpha-acetoxypropionate or methyl acetyl lactate, and unreacted acetic anhydride.
text: Acetic anhydride is so difficult to handle safely that it is a necessity to use standard laboratory equipment and procedure.
text: In the separation of acetic anhydride from solutions containing it, said solutions being characterized by the fact that it is difficult to separate the acetic anhydride therefrom by ordinary distillation methods, the steps comprising adding an entraining agent to the solution, said entraining agent being characterized by the fact that it will boil within the range of 90° C. to 1500 C., will form an azeotrope with the acetic anhydride in the solution, and is selected from the group consisting of normal paraffinic hydrocarbons, a mixture of normal paraffinic hydrocarbons, saturated cyclic hydrocarbons, and mixtures of saturated cyclic hydrocarbons, then fractionally distilling the mixture and recovering the resulting acetic anhydride-entraining agent azeotrope.