tag:blogger.com,1999:blog-8964719845369935777.post5598807793669001879..comments2024-03-27T21:23:40.339-04:00Comments on Chemjobber: Process Wednesday: sight glassesChemjobberhttp://www.blogger.com/profile/15932113680515602275noreply@blogger.comBlogger7125tag:blogger.com,1999:blog-8964719845369935777.post-91433863507815407392013-01-30T21:49:22.816-05:002013-01-30T21:49:22.816-05:00It sounds like an idea worth trying -- if I had co...It sounds like an idea worth trying -- if I had concerns, it would be about the ice cubes melting by the time they got to the interface? I dunno. It's certainly worth a shot. Chemjobberhttps://www.blogger.com/profile/15932113680515602275noreply@blogger.comtag:blogger.com,1999:blog-8964719845369935777.post-75015047034594494582013-01-30T21:47:38.419-05:002013-01-30T21:47:38.419-05:00This is a good idea. I like it.
(Hey, Ken, thank...This is a good idea. I like it. <br /><br />(Hey, Ken, thanks for all your comments on PW posts recently. They're high quality; I hope my posts continue to inspire them.) Chemjobberhttps://www.blogger.com/profile/15932113680515602275noreply@blogger.comtag:blogger.com,1999:blog-8964719845369935777.post-78176067630527960192013-01-30T20:00:52.845-05:002013-01-30T20:00:52.845-05:00Stewie Griffin:
Thanks... I think??
I was serious....Stewie Griffin:<br />Thanks... I think??<br />I was serious. Celite shows the phase separation but then has to be removed via polishing filter. Ice cubes should be easy to see in the sight glass, and ice doesn't have to be removed. Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-8964719845369935777.post-87738350498387466752013-01-30T18:52:01.508-05:002013-01-30T18:52:01.508-05:00I can verify Celite trick works great in real worl...I can verify Celite trick works great in real world. Rather than a "pinch" would use about a tablespoon worth.<br /><br />I swear some of the old operators could make the cut by ear as they would listen to the down flow and could tell when solvent changes pass through the valves.<br /><br />Ken what you state should be SOP/understanding for all process chemists to always extrapolate bench observation into the plant. Therefore can estimate where the phase cut should be and do an initial rapid transfer to get close then slow down to fine control for final cut.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-8964719845369935777.post-8745945457831264552013-01-30T18:42:16.158-05:002013-01-30T18:42:16.158-05:00aww... cute. I remember people using colored NMR t...aww... cute. I remember people using colored NMR tube plastic caps for the purpose - they float in water but sink in many organic solvents that form upper layer on watermilkshakehttp://orgprepdaily.wodpress.comnoreply@blogger.comtag:blogger.com,1999:blog-8964719845369935777.post-64934290048115886892013-01-30T14:01:10.298-05:002013-01-30T14:01:10.298-05:00Here's a trick for "tricky" phase cu...Here's a trick for "tricky" phase cuts we've used in the past:<br /><br />1) weigh bottom layer from lab scale reaction<br />2) calculate predicted weight of bottom layer for scale up run<br />3) separate abottom layer directly into drums on a balance, such that you have a good idea when you are nearing the phase cut<br /><br />Should work just as well using volume estimates if your reactors have level indicators, but not every reactor has them. A balance is also usually much more accurate than a level indicator.Kennoreply@blogger.comtag:blogger.com,1999:blog-8964719845369935777.post-25369407494344921292013-01-30T13:07:15.073-05:002013-01-30T13:07:15.073-05:00Stewie Griffin:
Why not just use ice cubes in plac...Stewie Griffin:<br />Why not just use ice cubes in place of celite?Anonymousnoreply@blogger.com