From: peter@tsto.co.uk   
      
   On 10/04/2023 19:30, Peter Fairbrother wrote:   
   > On 02/03/2023 16:28, Treon Verdery wrote:   
   >   
   >> is it possible to exceed vacuum distillation efficiency with clingy   
   >> gas that pulls no? because of pvnrt n and possibly r components   
   >> microdropets with high vacuum resistance could pull (van der walls)   
   >> but not gas   
   >   
   > yes because a) thermal conduction into liquid via gas is faster than   
   > through chamber walls and b) the evaporating surface area is larger and   
   > c) if the vapour pressure of the distillate is very low so there is free   
   > molecular flow (pv=nRt doesn't apply) the vapour next to the surface can   
   > be swept away reducing reabsorption see diffusion pump   
      
   d) the flow of carrier gas can sweep the evaporand away even if there is   
   no free molecular flow e) why can't there be van der Waals forces in   
   vapours/gases?   
      
      
   Peter F   
   >   
   > Peter F   
      
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