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Previous by Date: Subject: Re: [DCHAS-L] DCHAS-L readership survey results Date: Tuesday, April 21, 2020 at 4:57:23 PM Author: NEAL LANGERMAN <neal**At_Symbol_Here**CHEMICAL-SAFETY.COM> |
Next by Date: Subject: Re: [DCHAS-L] Schlenk Line Survival Guide Date: Tue, 21 Apr 2020 23:10:46 +0000 Author: Niteen Vaidya |
This Schlenk line guide is a bit simplistic and old-school. For example:
"The inert gas is vented through a bubbler (either oil or mercury).-"..
Really? mercury bubbler? We should only be recommending oil.
Rest of same sentence: "allowing the inert gas pressure to be monitored."
Not really. It does allow one to see the flow of inert gas, but not truly monitored. The function of the bubbler is to provide a small positive pressure so when one releases an evacuated flask to inert gas the system should not have negative pressure and suck in oil/air.
Missing from diagram - Since a taller column of oil is necessary to achieve the same positive pressure of inert gas, a trap should be placed between the inert gas manifold and the bubbler to catch oil moving towards the inert gas manifold.
Missing from diagram - An inert gas ballast should be connected to the inert gas manifold. My students use a 1 L flask so that when a larger evacuated flask is switched to inert gas the drop in inert gas manifold pressure is not so great as to suck oil back into the system. Too much pressure reduction and air could be sucked in after the oil.
The guide does not include information about usage, mainly just startup and shutdown. So maybe a starting point, but not a guide to usage.
Craig
Craig A. Merlic
Professor of Chemistry, UCLA Department of Chemistry and Biochemistry
Executive Director, UC Center for Laboratory Safety
Los Angeles, CA 90095-1569
Voice: 310-825-5466
From: ACS Division of Chemical Health and Safety <DCHAS-L**At_Symbol_Here**PRINCETON.EDU> on behalf of NEAL LANGERMAN <neal**At_Symbol_Here**CHEMICAL-SAFETY.COM>
Organization: Advanced Chemical Safety
Reply-To: <neal**At_Symbol_Here**CHEMICAL-SAFETY.COM>
Date: Tuesday, April 21, 2020 at 9:50 AM
To: <DCHAS-L**At_Symbol_Here**PRINCETON.EDU>
Subject: [DCHAS-L] Schlenk Line Survival Guide
ASYNT has updated its SCHLENK LINK SURVIVAL GUIDE. Very helpful for those new to vacuum techniques or as a sanity check for the pro.
https://schlenklinesurvivalguide.com/
Stay healthy and stay safe
Neal
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