If you need assistance, please send an email to forum at 4hv dot org. To ensure your email is not marked as spam, please include the phrase "4hv help" in the subject line. You can also find assistance via IRC, at irc.shadowworld.net, room #hvcomm.
Support 4hv.org!
Donate:
4hv.org is hosted on a dedicated server. Unfortunately, this server costs and we rely on the help of site members to keep 4hv.org running. Please consider donating. We will place your name on the thanks list and you'll be helping to keep 4hv.org alive and free for everyone. Members whose names appear in red bold have donated recently. Green bold denotes those who have recently donated to keep the server carbon neutral.
Special Thanks To:
Aaron Holmes
Aaron Wheeler
Adam Horden
Alan Scrimgeour
Andre
Andrew Haynes
Anonymous000
asabase
Austin Weil
barney
Barry
Bert Hickman
Bill Kukowski
Blitzorn
Brandon Paradelas
Bruce Bowling
BubeeMike
Byong Park
Cesiumsponge
Chris F.
Chris Hooper
Corey Worthington
Derek Woodroffe
Dalus
Dan Strother
Daniel Davis
Daniel Uhrenholt
datasheetarchive
Dave Billington
Dave Marshall
David F.
Dennis Rogers
drelectrix
Dr. John Gudenas
Dr. Spark
E.TexasTesla
eastvoltresearch
Eirik Taylor
Erik Dyakov
Erlend^SE
Finn Hammer
Firebug24k
GalliumMan
Gary Peterson
George Slade
GhostNull
Gordon Mcknight
Graham Armitage
Grant
GreySoul
Henry H
IamSmooth
In memory of Leo Powning
Jacob Cash
James Howells
James Pawson
Jeff Greenfield
Jeff Thomas
Jesse Frost
Jim Mitchell
jlr134
Joe Mastroianni
John Forcina
John Oberg
John Willcutt
Jon Newcomb
klugesmith
Leslie Wright
Lutz Hoffman
Mads Barnkob
Martin King
Mats Karlsson
Matt Gibson
Matthew Guidry
mbd
Michael D'Angelo
Mikkel
mileswaldron
mister_rf
Neil Foster
Nick de Smith
Nick Soroka
nicklenorp
Nik
Norman Stanley
Patrick Coleman
Paul Brodie
Paul Jordan
Paul Montgomery
Ped
Peter Krogen
Peter Terren
PhilGood
Richard Feldman
Robert Bush
Royce Bailey
Scott Fusare
Scott Newman
smiffy
Stella
Steven Busic
Steve Conner
Steve Jones
Steve Ward
Sulaiman
Thomas Coyle
Thomas A. Wallace
Thomas W
Timo
Torch
Ulf Jonsson
vasil
Vaxian
vladi mazzilli
wastehl
Weston
William Kim
William N.
William Stehl
Wesley Venis
The aforementioned have contributed financially to the continuing triumph of 4hv.org. They are deserving of my most heartfelt thanks.
Registered Member #8
Joined: Thu Feb 02 2006, 04:34AM
Location: Harlowton, MT, United States
Posts: 214
So how fast does glass dissolve in molten NaOH again?
I can't say for sure about NaOH specifically, but it will dissolve in other molten salts (CaCl2, LiCl/KCl) about like salt in water, and saturated aqueous NaOH will dissolve glass at a significant rate even at room temperature and below. Regular glass is also quite conductive at elevated temperature especially when in contact with ionic melts.
Have you given any more thought to the "frozen" or "skull layer" metal trap we had discussed?
Registered Member #193
Joined: Fri Feb 17 2006, 07:04AM
Location: sheffield
Posts: 1022
Backyard Skunkworks wrote ...
Bored Chemist wrote ...
Sodium will burn in CO2 and CO2 reacts with NaOH. You really can't use it as an "inert" gas here.
Yeah...
So how fast does glass dissolve in molten NaOH again?
It depends on the glass and the temperature, but I think the answer will be "far too fast". I wouldn't even consider using glass for this sort of thing. What's wrong with stainless steel? An old saucepan is probaly cheaper than glass as well as more robust.
Registered Member #1262
Joined: Fri Jan 25 2008, 05:22AM
Location: Maryland, USA
Posts: 451
I wasn't really talking about glass for the entire enclosure, I was thinking of using a glass divider to keep the molten sodium from shorting the electrodes together. Chris's point about the conductivity sort of eliminates the question anyway, what good is your non-conductive dividor when it starts conducting?
I guess I might be forced to use some type of cooling so I can have a non-conductive NaOH layer as a seperator, although this sure complicates things...
I guess the complexity of all this really drives home how reactive molten NaOH and Na really are. None the less, I want to keep trying to come up with a viable design for this thing.
Registered Member #8
Joined: Thu Feb 02 2006, 04:34AM
Location: Harlowton, MT, United States
Posts: 214
Here's a bit of info that might be helpful to you. You can see here that a 51.5% molar mixture of NaOH in KOH melts at only 170°C. That might not help much in terms of corrosion of ceramics, but it will make frozen traps or feedthroughs much easier to deal with.
This site is powered by e107, which is released under the GNU GPL License. All work on this site, except where otherwise noted, is licensed under a Creative Commons Attribution-ShareAlike 2.5 License. By submitting any information to this site, you agree that anything submitted will be so licensed. Please read our Disclaimer and Policies page for information on your rights and responsibilities regarding this site.
Castner process for making Sodium metal
