Chemistry: physical processes – Physical processes
Patent
1977-06-21
1978-09-19
Padgett, Benjamin R.
Chemistry: physical processes
Physical processes
62 66, 2523011W, G21F 902, C01G 4306
Patent
active
041150732
ABSTRACT:
It has been the practice to (a) withdraw hot, liquid UF.sub.6 from various systems, (b) direct the UF.sub.6 into storage cylinders, and (c) transport the filled cylinders to another area where the UF.sub.6 is permitted to solidify by natural cooling. However, some hazard attends the movement of cylinders containing liquid UF.sub.6, which is dense, toxic, and corrosive.
As illustrated in terms of one of its applications, the invention is directed to withdrawing hot liquid UF.sub.6 from a system including (a) a compressor for increasing the pressure and temperature of a stream of gaseous UF.sub.6 to above its triple point and (b) a condenser for liquefying the compressed gas. A network containing block valves and at least first and second portable storage cylinders is connected between the outlet of the condenser and the suction inlet of the compressor. After an increment of liquid UF.sub.6 from the condenser has been admitted to the first cylinder, the cylinder is connected to the suction of the compressor to flash off UF.sub.6 from the cylinder, thus gradually solidifying UF.sub.6 therein. While the first cylinder is being cooled in this manner, an increment of liquid UF.sub.6 from the condenser is transferred into the second cylinder. UF.sub.6 then is flashed from the second cylinder while another increment of liquid UF.sub.6 is being fed to the first. The operations are repeated until both cylinders are filled with solid UF.sub.6, after which they can be moved safely. As compared with the previous technique, this procedure is safer, faster, and more economical. The method also provides the additional advantage of removing volatile impurities from the UF.sub.6 while it is being cooled.
REFERENCES:
patent: 2649702 (1953-08-01), Kellie
Ishii, B. et al., Chemical Abstracts, 85, (1976), 69867k.
Takeda, S., Chemical Abstracts, 85, (1976), 100994a.
Fort William G. S.
Lee, Jr. William W.
Carlson Dean E.
Hamel Stephen D.
Kyle Deborah L.
Lewis Fred O.
Padgett Benjamin R.
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