Type of Document Dissertation Author Coli, Guido John Jr. URN etd-07102010-020030 Title The design, construction, and operation of a centrifugal molecular still Degree PhD Department Chemical Engineering Advisory Committee
Advisor Name Title Vilbrandt, Frank C. Committee Chair Murphy, Nelson F. Committee Member O'Shaughnessy, Louis Committee Member Keywords
Date of Defense 1949-05-15 Availability unrestricted AbstractMolecular distillation is distillation carried out in a sufficiently high vacuum such that the distance which molecules leaving an evaporator my travel, before being condensed, is comparable to the mean free path of the vapor molecules residual gas. The use of high vacuum thus provides the vapor molecules with an unobstructed path from the evaporator to condenser by removal of noncondensable gasses and greatly lowers the temperature at which distillation will occur...
There are two main types of molecular stills reported in the literature, the falling film and centrifugal. In their present state of development only the latter has sufficient capacity to warrant application on a commercial scale. In essence, this still consists of a heated rotating disk which distributes the fluid in a thin film across its surface by centrifugal force, and an adjacent cooler surface for collecting the vaporized molecules, the entire apparatus being enclosed in a highly evacuated container.
The purpose of this investigation was: (1) to construct a centrifugal molecular still having replacable rotating disks of varying sizes…; (2) to operate the molecular still and collect sufficient data to verify that this still had operating characteristics comparable to those reported in the literature; (3) to ascertain the effect of each of the variables listed on the operating characteristics of the still.
Filename Size Approximate Download Time (Hours:Minutes:Seconds)
28.8 Modem 56K Modem ISDN (64 Kb) ISDN (128 Kb) Higher-speed Access LD5655.V856_1949.C644.pdf 102.09 Mb 07:52:37 04:03:04 03:32:41 01:46:20 00:09:04next to an author's name indicates that all files or directories associated with their ETD are accessible from the Virginia Tech campus network only.
If you have questions or technical problems, please Contact DLA.