As an anhydride, It can be prepared by dehydrating its acid, i.e. Acetic acid, by strong dessicant such as Tetraphosphorus decaoxide (P4O10) : P4O10 + 12 CH3COOH ----> 4 H3PO4 + 6 (CH3CO)2O
You don't, quite simply. If you're asking, then you're not qualified to prepare substances that cause anesthesia. Furthermore, anesthesia should only be employed for medical purposes, in which case...
Since vinegar is dilute, first we have to boil it to make it concentrated. When acid is about 97% , keep it with phosphoric anhydride. As a powerful desiccant it will dehydrate Concentrated acetic...