I have found a page focused on the use of Sweet vitriol (Ether).
Read it through though and the documents. As you will see sulphuric ether is tested as well as a kind of tranquilizer even though it does not work well, since it has the exactly opposite effect, namely making the patient active. Just listen to this except:
"The first experiment was with sulphuric ether, the odor of which was
readily recognized in the preparation employed by Dr. Morton. Ether inhaled in vapor is well known to produce symptoms similar to those
produced by the nitrous oxide. In my own former experience the exhilaration has been quite as great, though perhaps less pleasurable, than that of this gas, or of the Egyptian haschish. It seemed probable that the ether might be so long inhaled as to produce excessive inebriation and insensibility; but in several experiments the exhilaration was so considerable that the subject became uncontrollable, and refused to inspire through the apparatus."
I have not seen the film you speak of and have no idea what the scene you refere to is about, but could the fumes of vitriol acid be used as a kind of drug?
Perhaps I am far out but if you could explain the scene more detailed I would have a better chance to know which areas I should be looking at for an answer.
This is the page. Click the icon saying: "About Ether"
'Tis an interesting tale in itself.
http://www.anesthesia-nursing.com/
-Selwyn