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Chemistry Forums for Students => Organic Chemistry Forum => Organic Chemistry Forum for Graduate Students and Professionals => Topic started by: student10 on July 30, 2013, 08:45:43 PM

Title: Amberlyst 15 and 21 ion exchange resin
Post by: student10 on July 30, 2013, 08:45:43 PM

Hello,

I would like to know if someone knows a good protocol to regenerate both amberlyst 15 and 21 ion exchange resin.

Thanks.

Title: Re: Amberlyst 15 and 21 ion exchange resin
Post by: Babcock_Hall on August 07, 2013, 11:17:49 AM

Do you know which Dowex resins are most similar to these two?

Title: Re: Amberlyst 15 and 21 ion exchange resin
Post by: salteen on August 07, 2013, 01:54:09 PM

I haven't used either of these, but I do regularly use Amberlite 120, which is also a strongly-acidic sulfonic acid resin.  I put a half-inch layer of the resin in a ~50mL glass frit, fill with 10% HCl, and let it drain by gravity with occasional stirring - if it doesn't empty by gravity, I'll let it sit for about 10 min and then use suction.  Then I wash the resin with 5-10 column volumes of water (with suction) until the water flowing through is pH 6-7.  Then wash once with methanol to remove organic impurities. 

I use this regularly to re-acidify solutions of NaOMe or K₂CO₃.  But as I said, this is a slightly different resin, so YMMV.

Title: Re: Amberlyst 15 and 21 ion exchange resin
Post by: Babcock_Hall on August 08, 2013, 09:21:16 AM

What counterion is presently bound?