12 December 2015 2 7K Report

In the book The Manipulation of Air-Sensitive Compounds by D.F. Shriver and M.A. Drezdzon, they give a inert atmosphere setup (figure attached) where inert gas flows from one inlet through the reaction flask to a mineral oil bubbler. However, during reaction and cooling they say to turn off the flow from that first inlet and turn on a second inlet flow of inert gas. I'm confused why there needs to be two inert gas inlets. Why can't there just be one inlet that is on the whole time for initial purging, reaction, and cooling? Shriver and Drezdzon mention that this two-inlet configuration prevents atmospheric gases from backing up into the system and minimizes exposure of the reaction mixture to impurities in the inert gas, but it seems to me that having one inlet would perform just as well.

Many thanks for your help.

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