tag:blogger.com,1999:blog-4387100009341358284.post7111747953702187030..comments2024-03-12T09:55:15.923+01:00Comments on Curly Arrow: Whatman Phase SeparatorsDaniel Sejerhttp://www.blogger.com/profile/12498255536497699232noreply@blogger.comBlogger18125tag:blogger.com,1999:blog-4387100009341358284.post-72482101506114063002012-01-04T08:42:30.670+01:002012-01-04T08:42:30.670+01:00@Anon.: I guess it is a matter of opinion if it wo...@Anon.: I guess it is a matter of opinion if it works well or not with solvents lighter than water. Try it and see what you think. If you only have a very small amount of water it works OK with the lighter solvents although it takes a while. However, if you have a larger volume it takes a long time for the separation to take place because most of the filter is occupied by the aqueous phase. D!Daniel Sejerhttps://www.blogger.com/profile/12498255536497699232noreply@blogger.comtag:blogger.com,1999:blog-4387100009341358284.post-54988549588558666652012-01-04T01:25:40.681+01:002012-01-04T01:25:40.681+01:00"It only works well with solvents more dense ..."It only works well with solvents more dense than water" I forwarded caution to lab using filter for hexane/water separation for quant work. The lab contacted Whatman and claims density should not matter. Any thoughts?Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-4387100009341358284.post-13938952598092481142010-10-08T11:32:31.670+02:002010-10-08T11:32:31.670+02:00If you're interested in separation, and these ...If you're interested in separation, and these papers, you might like the discussion going on at;<br /><br />http://www.sciencemadness.org/talk/viewthread.php?tid=14613#pid189554<br /><br />I know some of you are actual, real life, well funded lab chemists, and probably have access to equipment that can test for the better hidden effects.Johnhttps://www.blogger.com/profile/12028261077084460273noreply@blogger.comtag:blogger.com,1999:blog-4387100009341358284.post-35376630300457453082010-10-07T19:57:20.428+02:002010-10-07T19:57:20.428+02:00I found fabric spray (sprayable silicone) can turn...I found fabric spray (sprayable silicone) can turn a piece of ordinary filter paper into a MAGIC filter paper. 8P<br /><br />And I made a video...<br /><br />http://www.youtube.com/watch?v=GzlnaKW1wcQJohnhttps://www.blogger.com/profile/12028261077084460273noreply@blogger.comtag:blogger.com,1999:blog-4387100009341358284.post-76623882630814422522009-02-18T21:03:00.000+01:002009-02-18T21:03:00.000+01:00To ChcltBrcn: there is no big sense in drying if w...To ChcltBrcn: there is no big sense in drying if water will be removed anyway via an azeotrope. Let say if you do not want to mess with MgSO4 you can extract your water phase with EtOAc, add to your combined organic phase some toluene or CHCl3 or DCM (ca 1/4), wash this new combined organic phase with brine, filter through a small plug of cotton and concentrate on vacuum. No water should be left.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-4387100009341358284.post-29261396574771741112009-01-21T19:16:00.000+01:002009-01-21T19:16:00.000+01:00totaly interested. im working on 500 -140 ug scal...totaly interested. im working on 500 -140 ug scale and havent been able to get the water out of my NMR spectra. Anybody use this paper on that small of a scale?Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-4387100009341358284.post-74340695145628442072009-01-21T15:54:00.000+01:002009-01-21T15:54:00.000+01:00Perhaps a little Off-topic but, does anyone know a...Perhaps a little Off-topic but, does anyone know about the Waters FractionLynx purification system? I have a guy running one in my department and both times I've used it it's given incredible results, separating stereoisomers and really nasty halogenated mixtures. I don't have a clue how it works though...ChcltBrcnhttps://www.blogger.com/profile/11422826953493529809noreply@blogger.comtag:blogger.com,1999:blog-4387100009341358284.post-25933474260651086982009-01-11T12:54:00.000+01:002009-01-11T12:54:00.000+01:00Biotage also make similar things aimed more at sma...Biotage also make similar things aimed more at small scale parallel synthesis.<BR/>http://www.biotage.com/DynPage.aspx?id=25351Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-4387100009341358284.post-27543526953044554312009-01-11T07:38:00.000+01:002009-01-11T07:38:00.000+01:00oh.. its excellent. Thanks for this. I enjoy readi...oh.. its excellent. Thanks for this. I enjoy reading your blog very much..CARBON CHEMISTRYhttps://www.blogger.com/profile/14148478920569101828noreply@blogger.comtag:blogger.com,1999:blog-4387100009341358284.post-57060907505051521402009-01-09T13:32:00.000+01:002009-01-09T13:32:00.000+01:00I should mention one more thing. When you filter o...I should mention one more thing. When you filter on 1PS filter paper the separation is instantaneous. There is no waiting around to get the last couple of drops through the filter paper. The organic phase essentially falls through. Much more convenient than cotton, glass wool or standard filter paper and it's cheap too. Whatman should pay me for this free advertising. D!Daniel Sejerhttps://www.blogger.com/profile/12498255536497699232noreply@blogger.comtag:blogger.com,1999:blog-4387100009341358284.post-47249793948721361192009-01-09T13:28:00.000+01:002009-01-09T13:28:00.000+01:00Firstly, I've tried filtering emulsions on 1PS fil...Firstly, I've tried filtering emulsions on 1PS filter paper and unfortunately it doesn't work (hardly surprising really). Secondly, I'm sligtly confused about the azetrope story. I'll have to look this up when I get to work next week. I thinhk most of us know about the toluene/water azetrope, but I'm not familiar with the CHCl3, CH2Cl2/water azeotropes. I'll get back to this. D!Daniel Sejerhttps://www.blogger.com/profile/12498255536497699232noreply@blogger.comtag:blogger.com,1999:blog-4387100009341358284.post-82134765365826152232009-01-09T10:53:00.000+01:002009-01-09T10:53:00.000+01:00Quote: "One guy taught me no to dry an organic pha...Quote: "One guy taught me no to dry an organic phase if it contains a lot of DCM, toluene or CHCl3."<BR/><BR/>Why is this?ChcltBrcnhttps://www.blogger.com/profile/11422826953493529809noreply@blogger.comtag:blogger.com,1999:blog-4387100009341358284.post-88260084491899876832009-01-09T09:43:00.000+01:002009-01-09T09:43:00.000+01:00It seems to be nice thing for fast separation of p...It seems to be nice thing for fast separation of phases - thanks a lot!<BR/>But concerning drying - residual water goes as an aseotrope with DCM or CHCl3, the same as with toluene. One guy taught me no to dry an organic phase if it contains a lot of DCM, toluene or CHCl3. After separation of pases we just pass it throug a plug of cotton to get rid of droplets and go to a rotavap directly.<BR/><BRAnonymousnoreply@blogger.comtag:blogger.com,1999:blog-4387100009341358284.post-13867863180146756692009-01-08T13:41:00.000+01:002009-01-08T13:41:00.000+01:00Hey Lysen, surely you mean efficient and technolog...Hey Lysen, surely you mean efficient and technologically up to date, right? D!Daniel Sejerhttps://www.blogger.com/profile/12498255536497699232noreply@blogger.comtag:blogger.com,1999:blog-4387100009341358284.post-75852490666460910242009-01-08T08:43:00.000+01:002009-01-08T08:43:00.000+01:00You don't have to wait for the phases to separate ...You don't have to wait for the phases to separate and, more importantly, you don't have to dry your organic phase to remove residual water. D!Daniel Sejerhttps://www.blogger.com/profile/12498255536497699232noreply@blogger.comtag:blogger.com,1999:blog-4387100009341358284.post-20372501238095132342009-01-08T02:30:00.000+01:002009-01-08T02:30:00.000+01:00what is the advantage over the sep funnel? Particu...what is the advantage over the sep funnel? Particularly when the density of the solvent is heavier than water??Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-4387100009341358284.post-30358922550675281452009-01-07T17:45:00.000+01:002009-01-07T17:45:00.000+01:00The largest filter papers I have (15 cm diameter) ...The largest filter papers I have (15 cm diameter) can retain about 40 ml aqueous phase (the way I fold them). You can however get diameters up to 27 cm or even sheets measuring 28 x 46 cm. There is more info on this web site: http://www.whatman.com/1PSPhaseSeparators.aspx. D!Daniel Sejerhttps://www.blogger.com/profile/12498255536497699232noreply@blogger.comtag:blogger.com,1999:blog-4387100009341358284.post-38733600094853768732009-01-07T17:16:00.000+01:002009-01-07T17:16:00.000+01:00What kind of volumes can you put through it?What kind of volumes can you put through it?Timhttps://www.blogger.com/profile/04558813471766103419noreply@blogger.com