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Title: Process gas solidification system

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.6more » 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.« less

Inventors:
 [1];  [2]
  1. Oak Ridge, TN
  2. (Oak Ridge, TN)
Issue Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
OSTI Identifier:
863183
Patent Number(s):
4115073
Assignee:
United States of America as represented by United States (Washington, DC)
Patent Classifications (CPCs):
F - MECHANICAL ENGINEERING F17 - STORING OR DISTRIBUTING GASES OR LIQUIDS F17C - VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES
C - CHEMISTRY C01 - INORGANIC CHEMISTRY C01G - COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
DOE Contract Number:  
W-7405-ENG-26
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
process; gas; solidification; practice; withdraw; hot; liquid; various; systems; direct; storage; cylinders; transport; filled; permitted; solidify; natural; cooling; hazard; attends; movement; containing; dense; toxic; corrosive; illustrated; terms; applications; directed; withdrawing; including; compressor; increasing; pressure; temperature; stream; gaseous; triple; condenser; liquefying; compressed; network; block; valves; portable; connected; outlet; suction; inlet; increment; admitted; cylinder; flash; gradually; solidifying; therein; cooled; manner; transferred; flashed; fed; operations; repeated; solid; moved; safely; compared; previous; technique; procedure; safer; faster; economical; method; provides; additional; advantage; removing; volatile; impurities; additional advantage; compressed gas; process gas; hot liquid; removing volatile; storage cylinders; containing liquid; storage cylinder; /23/62/

Citation Formats

Fort, William G. S., and Lee, Jr., William W. Process gas solidification system. United States: N. p., 1978. Web.
Fort, William G. S., & Lee, Jr., William W. Process gas solidification system. United States.
Fort, William G. S., and Lee, Jr., William W. Sun . "Process gas solidification system". United States. https://www.osti.gov/servlets/purl/863183.
@article{osti_863183,
title = {Process gas solidification system},
author = {Fort, William G. S. and Lee, Jr., William W.},
abstractNote = {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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1978},
month = {1}
}

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