tag:blogger.com,1999:blog-8964719845369935777.post4602675143691890543..comments2024-03-27T21:23:40.339-04:00Comments on Chemjobber: Process Wednesday: Vortexes aren't good?Chemjobberhttp://www.blogger.com/profile/15932113680515602275noreply@blogger.comBlogger13125tag:blogger.com,1999:blog-8964719845369935777.post-22698432042998933212012-02-03T15:08:26.719-05:002012-02-03T15:08:26.719-05:00The Oxford Dictionary says both plural forms are a...The Oxford Dictionary says both plural forms are acceptable.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-8964719845369935777.post-5066790512583161952012-02-02T18:27:12.340-05:002012-02-02T18:27:12.340-05:00Our local glassblower suggested crimping the walls...Our local glassblower suggested crimping the walls of the RBF slightly, each baffle 120 degrees from the next. Apparently she does this all the time for larger (~1L) erlenmeyer flasks.<br /><br />I've asked her to crimp two 100mL RBFs, to see how well they work.Pamplemoussenoreply@blogger.comtag:blogger.com,1999:blog-8964719845369935777.post-27406689634093414942012-02-02T14:32:38.334-05:002012-02-02T14:32:38.334-05:00I don't know if the placement is correct, but ...I don't know if the placement is correct, but like Anon9:52a says below, thermocouples or a thermal well (closed glass tube, mounted in adapter) should help at least a little.Chemjobberhttps://www.blogger.com/profile/15932113680515602275noreply@blogger.comtag:blogger.com,1999:blog-8964719845369935777.post-45492672148352535122012-02-02T14:28:37.544-05:002012-02-02T14:28:37.544-05:00Well, I guess the question is now: How do you set ...Well, I guess the question is now: How do you set up a simple baffle for small (<250mL) reactions?Pamplemoussenoreply@blogger.comtag:blogger.com,1999:blog-8964719845369935777.post-85978014855632962312012-02-02T12:22:49.588-05:002012-02-02T12:22:49.588-05:00I must know: isn't it "vortices?"
...I must know: isn't it "vortices?" <br /><br />I mean, there aren't any matrixes (matrices, yes?). However, there are duplexes, sixes, and perplexes is still a verb. So, I'm stuck.See Arr Ohhttp://justlikecooking.blogspot.comnoreply@blogger.comtag:blogger.com,1999:blog-8964719845369935777.post-43973430149537474332012-02-01T12:52:22.453-05:002012-02-01T12:52:22.453-05:00It all depends... on the goals. If the process goa...It all depends... on the goals. If the process goal is to efficiently mix liquid(s) then vortex is bad and baffles are good. If the process goal is to mix liquids and gases (hydrogenation) then the vortex is very effective and baffles are bad.<br /><br />We used to use baffles in RBFs. Back in the day they were called thermometers. Now we have thermocouples - 1/8", 1/16", 1/32"...Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-8964719845369935777.post-79409286164507355352012-02-01T12:44:16.014-05:002012-02-01T12:44:16.014-05:00This video gave me a good idea of the benefits of ...This video gave me a good idea of the benefits of a baffle to mixing!<br /><br />http://www.youtube.com/watch?v=6E2-y96uYR4&noredirect=1marvinthefishnoreply@blogger.comtag:blogger.com,1999:blog-8964719845369935777.post-35998501920038957542012-02-01T12:27:37.478-05:002012-02-01T12:27:37.478-05:00this "vortex does a lousy job at mixing"...this "vortex does a lousy job at mixing" downed on me after running anionic polymerizations where one of the commonly-used bases (organopotassium that makes deeply-colored dark solutions) is added via canula to a stirred solution of the initiator until a hint of the organopotassium color persists - just like a titration. So if you stir vigorously with a healthy-looking vortex in the middle as you canulate the organopotassium in and if you aim onto the center of vortex around the stirbar (instead of the periphery of your vortex) you wil have a swirlingh colorless reaction mix with a deep-colored column of unmixed organopotassium right around the vortex center, looking like a miniature tornado. Very pretty/milkshakehttp://orgprepdaily.wordpress.comnoreply@blogger.comtag:blogger.com,1999:blog-8964719845369935777.post-46347402192729118372012-02-01T11:46:14.587-05:002012-02-01T11:46:14.587-05:00Assuming things are isothermal and laminar, the st...Assuming things are isothermal and laminar, the stuff that's stuck in a vortex can only get out by diffusion.<br /><br />I've seen this sort of stuff in the gas phase where recirculation can result in very long residence times compared to what you'd expect based on flows and volumes.materials guynoreply@blogger.comtag:blogger.com,1999:blog-8964719845369935777.post-12649232979723978602012-02-01T11:33:32.222-05:002012-02-01T11:33:32.222-05:00Paul Mavros has got quite some publications relate...Paul Mavros has got quite some publications related to mixing on it's name. I suggest you check his website out . https://docs.google.com/Doc?id=dc2ptgt2_112cn4dxwdnAnonymoushttps://www.blogger.com/profile/14243609075227986811noreply@blogger.comtag:blogger.com,1999:blog-8964719845369935777.post-89116479800364251702012-02-01T11:31:38.538-05:002012-02-01T11:31:38.538-05:00I am intrigued, too. I guess in my 100 mL rbf hea...I am intrigued, too. I guess in my 100 mL rbf heat transfer and distribution probably isn't so much of a problem...azmanamhttp://www.chemistry-blog.comnoreply@blogger.comtag:blogger.com,1999:blog-8964719845369935777.post-19624244819557034302012-02-01T10:25:11.902-05:002012-02-01T10:25:11.902-05:00Try vortexing at a party and see how you get on! B...Try vortexing at a party and see how you get on! Better mixing (WOTS).Quintusnoreply@blogger.comtag:blogger.com,1999:blog-8964719845369935777.post-68800935061000754132012-02-01T10:22:05.928-05:002012-02-01T10:22:05.928-05:00Probably why James Bond always has his drinks &quo...Probably why James Bond always has his drinks "shaken, not stirred".Anonymousnoreply@blogger.com