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Topic: improving product yield  (Read 31675 times)

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Offline plu

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Re: improving product yield
« Reply #15 on: June 14, 2006, 09:01:59 PM »
Thank you everyone for your excellent input.  I did another experiment today and I got a product yield of 85%!  (The ideal value was 80-90%.)  However, after doing an analysis of my product's melting point, I found that I had a notable amount of impurities; my melting point range was stretched over 6 oC.  I am thinking that this is due to a small amount of solvent that was left behind with the product crystals after the recrystallization/filtration procedure that I had performed.  I had left my product to dry for 15 minutes on a piece of filter paper placed on a Buchner funnel connected to a vacuum system (after I had filtered my recrystallized crystals), but apparently this was not sufficient.  Is there any other/better way to dry my product to improve purity?

Offline pantone159

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Re: improving product yield
« Reply #16 on: June 15, 2006, 01:36:41 AM »
Is there any other/better way to dry my product to improve purity?

Let it dry overnight, if you have the time.

Offline plu

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Re: improving product yield
« Reply #17 on: June 15, 2006, 07:30:07 AM »
Let it dry overnight, if you have the time.

Unfortunately, I do not have this time   :-\  Would leaving a second piece of filter paper on top of my product crystals help dry the remaining solvent more thoroughly and quickly?

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