tag:blogger.com,1999:blog-8964719845369935777.post4674677608999859410..comments2024-03-27T21:23:40.339-04:00Comments on Chemjobber: Process Wednesday: "seasoning"?Chemjobberhttp://www.blogger.com/profile/15932113680515602275noreply@blogger.comBlogger7125tag:blogger.com,1999:blog-8964719845369935777.post-43265936088384479112016-11-10T09:26:37.964-05:002016-11-10T09:26:37.964-05:00I suspect that the seasoning batches consume whate...I suspect that the seasoning batches consume whatever compounds would poison the catalyst. We sometimes need to do this where I work.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-8964719845369935777.post-61483419749153471632016-10-27T08:19:19.309-04:002016-10-27T08:19:19.309-04:00You can cook in them at any point, even if they...You can cook in them at any point, even if they're rusty, I just don't think I would eat the food coming out of that pan...Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-8964719845369935777.post-9028852223400159312016-10-26T18:43:57.319-04:002016-10-26T18:43:57.319-04:00Also, if your hydrogenation stalls, it is advisabl...Also, if your hydrogenation stalls, it is advisable to filter off the heterogenous catalyst and re-submit the filtrates to fresh hydrogenation catalyst, rather than adding more and more catalyst.<br /><br />Pd-catalysed coupling reactions often proceed through Pd-nanoparticles generated from Pd pre-catalyst, and a parasitic process like their agreggation of the active Pd species into Pd black can derail it. (For this reason Heck high-temp reactions in particular are sensitive to catalyst overload, they work better with lower catalyst loading.) milkshakehttps://www.blogger.com/profile/08188961610554710616noreply@blogger.comtag:blogger.com,1999:blog-8964719845369935777.post-87025148738825091712016-10-26T15:07:56.325-04:002016-10-26T15:07:56.325-04:00I thought cast iron pots/pans needed to be seasone...I thought cast iron pots/pans needed to be seasoned before you cooked in them?Hapnoreply@blogger.comtag:blogger.com,1999:blog-8964719845369935777.post-86003602581949966552016-10-26T14:56:05.789-04:002016-10-26T14:56:05.789-04:00This is the same idea as running a conditioning ba...This is the same idea as running a conditioning batch for hydrogenations. Conditioning the reactor for a sensitive hydrogenation reaction as a technique has been around for a long time.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-8964719845369935777.post-33832863006735971842016-10-26T06:11:24.841-04:002016-10-26T06:11:24.841-04:00Pd II is a pretty strong oxidizing agent, with an ...Pd II is a pretty strong oxidizing agent, with an Eo of +0.987V, about the same as elemental bromine. The activation barrier is low and it's unscrupulous about what it deposits on, just like silver. Presumably you're working at much lower catalyst loadings than the academic versions, which are already low, anon electrochemistnoreply@blogger.comtag:blogger.com,1999:blog-8964719845369935777.post-10189836698292258162016-10-26T05:50:01.469-04:002016-10-26T05:50:01.469-04:00If the purpose of this step is mainly a test run, ...If the purpose of this step is mainly a test run, 'seasoning' might be misleading. Maybe they assume that the first batch will catch any catalyst poisons that are present. In that case, running that step contributes to the successful run of the main batch. Then 'seasoning' in the sense of 'preparing' would work. Oh, semantics.Anonymousnoreply@blogger.com