Aerodynamic separation of gases and isotopes : recent by E Phillip Muntz; John F Wendt

By E Phillip Muntz; John F Wendt

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1~). d) I n some c a s e s , this t y p e o f c o n n e c t i o n i s n o t p r a c t i c a l , and t h e columns a r e o p e r a t e d as 3-stream s e p a r a t i n g e l e m e n t s w i t h a s i n g l e feed s t r e a m , n e a r t h e middle of t h e column, and two w i t h d r a w a l streams, one a t e a c h end. A s c h e m a t i c diagram of t h i s t y p e o f c a s c a d e would look similar t o F i g u r e I I I . l b , b u t w i t h t h e i n d i v i d u a l e l e m e n t s i n t h i s c a s e b e i n g columns r a t h e r t h a n s i n g l e s e p a r a t i n g s t a g e s .

4) A so that the work required for a reversible, isothermal separation is equal to the Gibbs free energy change of the system. ,brings about a more ordered, less random, arrangement). 4) yields . 5 where pf and pi represent the final and initial pressures, respectively. 5) is frequently illustrated with the use of the concept of ideal semi-permeable membranes. Consider a reservoir containing a binary gas mixture at pressure T in which the concentration of specified component is z. For the separation of n moles of this mixture into the two pure components, we permit n z moles of the specified component to pass at its partial pressure through a semipermeable membrane which is impermeable to the other component and then compress this gas to the original system pressure T.

T ....... __ . - . 0. 0 30 TABLE 4 RAYLEIGH DI STILLATION 0 . RIt314 1 . @4 ----- -. I79735 1 . 1Q251 1 16986 1 I 1572 .. 427978 436833 -97712 -975635 9 7 4 3 79 . 2 . 3 6 1 31 , %" 7,- TABLE 4 CONT'D. 544935 -552421 -559725 -945676 -942699 -939578 a936337 ~932816 56656 5738 1 2 -58357 -587121 -929278 9 2 5533 . 645433 643093 63968 7 -635123 -798697 . 38fl25 7 3 1232 5 -214213 4497U3 . 3 9 ? ) 49 -313699 - 2 1 6332 * -61659 * 32 work per unit upflow is a maximum when the cut is equal to zero.

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