INDUSTRIAL A N D E N G INEERING CHEMISTRY
12
Vol. 18, No. 1
EXAMPLE OF USE
The utility of such an experimental dryer was demonstrated during the development of a pilot-plant pmeess for extracting rubber from the Russian dandelion. The purified rubber as extracted from the root was in the form of small discrete particles which floated in water. This material
cte.
Sam&
from eneh test were dhheeked
6 i c ~ m o o u n d ~ nt hal
175 c.f.in. per square foot of pan a&; the tray was loaded with 0.75 pound (dry woight) of rubher per square foot.
MOISTURE. DRY 8ASlS-LBS.1100 LBS RUBBER
It was demonstrated that such a heat-sensitive material could be dried verv raoidlv at. an olcvat,ed temuerature with better results and more economioally than by a conventional method for drying such vacuum drying. The data Obtained made possible the operation of a pilot-plant dryer under conditions which yielded the best quality of dried rubber. I
The conditioned air finally p a w s through a copper diffusing screen, 6, which eliminates any droplets of water. If the humidifying nozzles were located in the duct lesding to the heater, the diffusing screen would be unnecessary. The air now returns to the blower for mother cycle.
Pycnometer
.
.
Holder
ROBERT E . LEDLEY, JR., Sun Oil Company, Norwood, Pa
SINCE
the publication by Lipkin, Davison, Harvey, and Kurtz (1) of a new design of pycnometer especially suited t o
the meeise determination of the densities of volatile liauids. mutine use of this instrument has indicated the need for a multiple holder assembly with which to support two or more pycnometers at one time in a glass jar thermostat. A simple and satisfactory type of holder which has heon in use in this laboratory for several years is illustrated and described herewith. Figure 1 shows the structural details of the holder proper. 1
SECTIONA A SOLDER
TO ROD
SHEET
,
It may be made of brass or any other available metal which can be hard- or soft-soldered and will not oorrodc in the thermostat linnid.
Figure 2 illustrates a convenient mounting for suspending the holders in the thermostat. It consist8 of a brass bar 0.125 inch thick, 1 inoh wide, and 12 inohes long with seven inch holes drilled 1.5 inches apart to acoommodate the threaded ends of the holders. Two nuts support each holder and permit regulation of the depth of immersion of the pycnometers. A total of six holders with pycnometers may be conveniently suspended in a 12-inch diameter jar with this mounting. The ends of the mounting as illustrated are drilled to fit over posts clamped to the sides of the thermostat. However, the pasts need not be used, the bar simply being allowod to rest on the edges of the jar. Individual mountings for each holder which can be hooked or clzrnpeil to the edee of the jar may he used if desired.
METAL
WING NUT I
SUPPORT
out removing the' assembly from the bath or disturbing other pycnometers mounted in it.
HEX. NUT
LITERATURE CITED
(1)
Lipkin, M. R., Dsvison. J. A.. Harvey, W. T..and Kurt.. S. 8.. Jr.. IND.END. CHEM., ANAL.ED.,16. 55 (1944).
SECTION Figure
BB
1. Pycnometer Holder Detail
Figure
2.
Multiple Holder Assemblq
