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To: pgerassi who wrote (21738)	12/6/2000 5:49:57 PM
From: Bill Jackson	Respond to of 275872

Pete, I had assumed that SiF4 would be a gas since so many sister compounds are gasses. It looks doable. the only question is the cost of the electricity. This looks like a dual distillation method with Si28 going upstream and the others going downstream. I wonder how the various distillation processes would work here? since a distillation column with enormous numbers of theoretical plates can be made easily. Of course we need a difference in boiling temp of 2/3 liquids with the assorted Si isotopes in it. Does us no good if they all boil the same. What about column methods based on the size? The expectation that 28 will be a little smaller than 29/30...I guess that is basically a diffusion method. What doe EP do? Bill