ANALYTICAL EDITION
June, 1944
399 LITERATURE CITED
in or reactive with stopcock lubricants, since stopcock 1 alone would have to be replaced by another closure ( 3 ) . The use of a Pyrta cut-off, for example, would eliminate both stopcock 1 and the ground-glass joint below it.
(1) Brunauer. Emmett, and Teller, J . Am. Chem. SOC., 60, 309 (1938); also “Advances in Colloid Sciences”, Vol. 1, p. 35,
New York, Interscience Publishers, 1942.
(2) Emmett and Brunauer, J . Am. Chem. soc., 59, 1553 (1937).
(3) Farkas and Melville, “Experimental Methods in Gas Reactions”, pp. 62-6, London, Macmillan Co., 1939. (4) LaLande, McCarter, and Sanborn, IND. ENQ.CHEM.,36, 99 (1944). (5) Livingston. J . Am. Chem. Soc., 66, 569 (1944).
ACKNOWLEDGMENT
The author wishes to thank the Attapulgus Clay Company for permission t o publish the data (4) of Figure 2.
Improved Distilling
Flask
ERICH BAER, Department of Chemistry,
THE
tendency of many substances to solidify on condensation, thus blocking narrow and inaccessible parts of a distilling apparatus, often leads to interruption of the distillation. To overcome this difficulty Anschute ( 1 ) designed an all-glass distilling unit in which the receiver, acting also as condenser, was sealed on to thc flask. This construction allowed the removal of obstructing material by heat applied externally. The scimitarshaped receiver, however, which gives the name of sword flask to this type of distilling flask, was unsuitable for the collection of larger amounts of distillate. There was also a risk of contamination by accidental contact with the rubber stopper a t the end of the receiver, and complications were encountered when in vacuum distillations the simultaneous use of thermometer and capillary was required.
Banting Institute, Toronto, Canada
A few simple changes in the form of the Anschuta flask led to an improved distilling flask (Figure I ) of general applicability which has rendered valuable service over a number of years in distilling substances of low or high boiling point a t either normal or reduced pressure. Two of the inconveniences encountered when using the Anschuta flask were overcome by giving the receiver a straight cylindrical shape of greeter diameter and an outlet tube. These alterations, without unduly enlarging the receiver, considerably increase its capacity and prevent accidental contamination of the distillate by rubber. TO accommodate separately a thermometer and a capillary a short side arm opposite the receiver and a t the same height has been added. The thermometer and t h e capillary tube are held in place by rubber stoppers. If rubber must be avoided, the distilling flask shown in Figure 2 can be used with advantage, as it is eqpecially designed for the distillat i o n of c o r r o s i v e substances. Both flasks, sturdy by virtue of deFigure 2 sign, are speedily assembled or diqmantled and easily cleaned. The approximate meaiurements for the different sizes of the distilling flask (Figure 1) commonly used in this laboratory are listed in Table I. Ace Glass, Inc., Vineland, N. J., will 4tock this improved inord flask after the war, and at present is willing Outside Diameter to fill any specific order for thiq item, of Dista!
9 Figure 1
Table I.
Dimensions of Flask Distalire L,f
C’aImcI7Y of
liiilb (V?.
Seck ~ ~ l i Recriver ~ . ~ Side ~ A~r m C‘apa?. O u t Tube and OutOutside side side Side Arm ity o f , R e - Diamfrom Diani1) ia m 1wwr r,ter I.ength Bulb eter Leilath et?) I.mrrth c‘c. Cm. Cm. Cm. Cm. Cm. Cm. Cm.
-
4
1 2
10
10
1 6
6 .i
2 0
1 8
$51)
:30
1 6
11 0
3 3
2.5
1 u0
MI
1 G
12.0
4.5
3.2
300
l(i0
2.2
13.5
.?,i
4.4
5.?0
300
2.5
I S 3
a.5
3.0
4
6.5
1.5
.\leaswed along lower edge of receiver. b IIeasured along u p p w edge of receiver.
1.6
2 2
E n d of Receivrr
2 5
0.8
3.0
8.0 8.0
0.8
3.5
0.9
11.0 12.0 16.0 1.55 20.0
1,s
ACKNOWLEDGMENT
C‘Vl.
3.0a 1 . 2 4.8b 3.5 1.5 3,0 6.0 1 5
0.8
1.7
5.0
1.0
2.1
2.0
1 .(J
The author wishes to express hi. thanks to Miss Marjorie Muir, RoyaI Ontario Museum, Toronto, for
preparing the drawings. The sealed-in capillary and thermometer jacket were added by J. C. Sowden, Toronto. LITERATURE CITED :1)
Lassai-Cohn, “Arbeitsmethodenfur organisch-chemlsche Laboratorien”, 5th ed., Vol. 1, p 76, Leiprig, Leopold T’oss,
1923.
