A Vacuum Sublimator How ruould you like a simple,inexpensive vacuum suhlimator that never gets stuck, requires no grease, and holds a high vacuum? The key t o this is a common $0.29 hardware store item called a in. spud washer which will serve as a seal similar to the rubber cones used with Biichner funnels. The bottom is a side neck test tube made from 60-mm glass tubing. The condenser is a test tube made from 27-mm glass joined to 40-mm glass flared to a lip diameter of 61 mm as shown in the picture. No surfaces are ground glass; they are fire palished. In a rwthinl: l a l ~ r a t m ywe used this nppmmla for the purification of norhorned,' w ~ l hikr ~nthe rc,ndrnsrrand an xipirator tu pn,v:de the vacuum. The vacuum quickly i~rhtvnsrhr halwsagainct the wddw,and yet releasing the vacuum lraves the p r t i loose for easy removal of the sublimate.
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Moore, James A,, and Dalrymple, David L., "Experimental Methods in Organic Chemistry," 2nd ed., W. B. Saunders Co., Philadelphia, 1976, p. 164. University of New Orleans J o h n C. Stowell New Orleans, Louisiana 70122
422 / Journal of Chemical Education
