SEPARATION OF LITHIUM ISOTOPES BY MOLECULAR DISTILLATION: SECOND MEVAC PILOT PLANT
Technical Report
·
OSTI ID:4264557
An improved eight stage molecular still for separating isotopes of lithium is described. This unit incorporates desirable design characteristics of a previous unit, Mevac I, such as, close spacing between distilland and condenser, with a simple stage arrangement permitting gravity flow of distilland. Its special features include a flat condenser surface, improved side and end closures, and elevated distillate flow troughs. Performance of the unit was generally satisfactory, with separation efficiencies at total reflux ranging from 47 to 58%. Stage separation factors varied from 1.052 to 1.064 in the temperature range 627 to 535 deg C. (Measured distillation rates 0.69 to 0.17 g/ (cm/sup 2/)1hr)). Corrosion of type 321 stainiess steel used in fabrication of the unit was not found to be a serious problem. Certain mechanical limitations resulting in excessive stress concentration in the longitudinal weld seams are recognized, however, and suggestions for a modified design are included. (auth)
- Research Organization:
- Oak Ridge Gaseous Diffusion Plant, Tenn.
- DOE Contract Number:
- W-7405-ENG-26
- NSA Number:
- NSA-13-009504
- OSTI ID:
- 4264557
- Report Number(s):
- K-1220(Del.)
- Country of Publication:
- United States
- Language:
- English
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