Sofnolime chemistry

watalibi · 29th January 2008, 07:31

Hello divers,

My 20 years old daughter, Marine, has to write a paper in Chemical Engineering and she chose to explain the chemistry in rebreathers. I don't know why ? So she is looking for details on the intimate reactions that occur in the oxygen cells (redox between electrodes, role of the KOH or weak acid electrolyte, ... ) and in the sofnolime. Any link of enginer level ?

Thank you.

Stephane.
accueil watalibi

johanvanlyl · 29th January 2008, 07:43

Stéphan,

sorry but i can't help you with this one !

Hope we will meet at La Ciotat end of april.

Salutations,

johan

schnappi · 29th January 2008, 09:10

Quote: (Originally Posted by watalibi)

Hello divers,

My 20 years old daughter, Marine, has to write a paper in Chemical Engineering and she chose to explain the chemistry in rebreathers. I don't know why ? So she is looking for details on the intimate reactions that occur in the oxygen cells (redox between electrodes, role of the KOH or weak acid electrolyte, ... ) and in the sofnolime. Any link of enginer level ?

Thank you.

Stephane.
accueil watalibi

dont know whether this is enough, but here is some details on the reaction in the lime:
Soda lime - Wikipedia, the free encyclopedia

cheers
--bruno

Abbo · 29th January 2008, 09:32

Quote: (Originally Posted by schnappi)

dont know whether this is enough, but here is some details on the reaction in the lime:
Soda lime - Wikipedia, the free encyclopedia

cheers
--bruno

Yes, but as described by Molecular Products Ltd, carbonic acid does not play a significant part in the reaction:
http://www.rebreatherworld.com/scrub...scrubbers.html
That said, as I commented at the end of the thread on 11 Jan, the equations are not balanced in Molecular Products' post.
I think he meant to write:
CO2 + NaOH => NaHCO3
NaHCO3 + Ca(OH)2 => CaCO3 + NaOH + H2O

For confirmation, if you look up carbonic acid
Carbonic acid - Wikipedia, the free encyclopedia
it reminds us that at 25 degrees C, carbonic acid does not form.

Take all this with a pinch of sodium chloride as I'm a physicist not a chemist.

JonnyB · 29th January 2008, 09:47

hi!
I would recommend you to contact Jaap on this board. He is an amazing guy with lots of knowledge in this area.

/Jonny

jaap · 29th January 2008, 23:57

Quote: (Originally Posted by watalibi)

Hello divers,

My 20 years old daughter, Marine, has to write a paper in Chemical Engineering and she chose to explain the chemistry in rebreathers. I don't know why ? So she is looking for details on the intimate reactions that occur in the oxygen cells (redox between electrodes, role of the KOH or weak acid electrolyte, ... ) and in the sofnolime. Any link of enginer level ?

Thank you.

Stephane.
accueil watalibi

Hi

Open access (for free) links to interesting science and engineering publications can be a bit tricky. But why not suggesting spending some time searching with relevant key words at: Rubicon Research Repository: Home

If she is using a computer at a University or similar I'm sure they have access to some library function that will enable wide searches of other publications that could be of interest.

You will find way too much information...perhaps not exactly what you ask for but there is definately enough and a lot more to choose from if the subject of the report is fairly free.

I don't feel like fishing out any detailed online links since there is too big a risk I will get stuck spending way too much time on some findings on the way that I missed.

But if you guys feel like it, send a draft of the report to me once its ready for a few comments, perhaps both will benefit from it. If its in French I most certainly will ;-) Struggle to keep from forgetting too much of it, especially technical French.

Quote: (Originally Posted by JonnyB)

hi!
I would recommend you to contact Jaap on this board. He is an amazing guy with lots of knowledge in this area.

/Jonny

Thats nice of you Jonny. I guess I owe you a beer for such compliments...

29th January 2008, 07:31	#1 (permalink)
watalibi New Member Current Rebreather/s: Inspiration Vision Megalodon Sport Kiss Other Rebreather/s: Inspiration Classic Evolution Join Date: Nov 2005 Location: France Posts: 41	Sofnolime chemistry Hello divers, My 20 years old daughter, Marine, has to write a paper in Chemical Engineering and she chose to explain the chemistry in rebreathers. I don't know why ? So she is looking for details on the intimate reactions that occur in the oxygen cells (redox between electrodes, role of the KOH or weak acid electrolyte, ... ) and in the sofnolime. Any link of enginer level ? Thank you. Stephane. accueil watalibi
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29th January 2008, 07:43	#2 (permalink)
johanvanlyl New Member Current Rebreather/s: Megalodon Other Rebreather/s: Inspiration Vision Join Date: Nov 2005 Location: Belgium Posts: 50	Re: Sofnolime chemistry Stéphan, sorry but i can't help you with this one ! Hope we will meet at La Ciotat end of april. Salutations, johan
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29th January 2008, 09:10	#3 (permalink)
schnappi New Member Current Rebreather/s: Inspiration Vision Other Rebreather/s: Join Date: Jan 2007 Location: Zurich, Switzerland Posts: 30	Re: Sofnolime chemistry Quote: (Originally Posted by watalibi) Hello divers, My 20 years old daughter, Marine, has to write a paper in Chemical Engineering and she chose to explain the chemistry in rebreathers. I don't know why ? So she is looking for details on the intimate reactions that occur in the oxygen cells (redox between electrodes, role of the KOH or weak acid electrolyte, ... ) and in the sofnolime. Any link of enginer level ? Thank you. Stephane. accueil watalibi dont know whether this is enough, but here is some details on the reaction in the lime: Soda lime - Wikipedia, the free encyclopedia cheers --bruno
(Offline)

29th January 2008, 09:32	#4 (permalink)
Abbo Going down on Meg Current Rebreather/s: Megalodon Other Rebreather/s: Join Date: Aug 2006 Location: Tokyo Posts: 366	Re: Sofnolime chemistry Quote: (Originally Posted by schnappi) dont know whether this is enough, but here is some details on the reaction in the lime: Soda lime - Wikipedia, the free encyclopedia cheers --bruno Yes, but as described by Molecular Products Ltd, carbonic acid does not play a significant part in the reaction: http://www.rebreatherworld.com/scrub...scrubbers.html That said, as I commented at the end of the thread on 11 Jan, the equations are not balanced in Molecular Products' post. I think he meant to write: CO2 + NaOH => NaHCO3 NaHCO3 + Ca(OH)2 => CaCO3 + NaOH + H2O For confirmation, if you look up carbonic acid Carbonic acid - Wikipedia, the free encyclopedia it reminds us that at 25 degrees C, carbonic acid does not form. Take all this with a pinch of sodium chloride as I'm a physicist not a chemist.
(Online)

29th January 2008, 09:47	#5 (permalink)
JonnyB Jonny The Hatch Current Rebreather/s: MK 15.X Titan Home Build Other Rebreather/s: Not Bought Yet Inspiration Classic Megalodon Sport Kiss Classic Kiss Home Build Join Date: Jan 2005 Location: Sweden (Stockholm)/Cyprus(Ayia Napa) Posts: 940	Re: Sofnolime chemistry hi! I would recommend you to contact Jaap on this board. He is an amazing guy with lots of knowledge in this area. /Jonny __________________ A quote from Crazyduck - In remembering our own Rob Davies. "Outbound flight 777 heavy you are cleared for flight Due west into that warm red Texas sunset You have angels on your wings and divers memories on your six." Rest In Peace http://www.divetekcyprus.com http://www.diveccr.com
(Offline)

29th January 2008, 23:57	#6 (permalink)
jaap Normal people worry me Current Rebreather/s: Classic Kiss Other CCR RB80 / Clone Ray Other SCR Home Build Other Rebreather/s: Other CCR RB80 / Clone Ray Other SCR Home Build Join Date: Jun 2005 Location: Stockholm Sweden Posts: 437	Re: Sofnolime chemistry Quote: (Originally Posted by watalibi) Hello divers, My 20 years old daughter, Marine, has to write a paper in Chemical Engineering and she chose to explain the chemistry in rebreathers. I don't know why ? So she is looking for details on the intimate reactions that occur in the oxygen cells (redox between electrodes, role of the KOH or weak acid electrolyte, ... ) and in the sofnolime. Any link of enginer level ? Thank you. Stephane. accueil watalibi Hi Open access (for free) links to interesting science and engineering publications can be a bit tricky. But why not suggesting spending some time searching with relevant key words at: Rubicon Research Repository: Home If she is using a computer at a University or similar I'm sure they have access to some library function that will enable wide searches of other publications that could be of interest. You will find way too much information...perhaps not exactly what you ask for but there is definately enough and a lot more to choose from if the subject of the report is fairly free. I don't feel like fishing out any detailed online links since there is too big a risk I will get stuck spending way too much time on some findings on the way that I missed. But if you guys feel like it, send a draft of the report to me once its ready for a few comments, perhaps both will benefit from it. If its in French I most certainly will ;-) Struggle to keep from forgetting too much of it, especially technical French. Quote: (Originally Posted by JonnyB) hi! I would recommend you to contact Jaap on this board. He is an amazing guy with lots of knowledge in this area. /Jonny Thats nice of you Jonny. I guess I owe you a beer for such compliments... __________________ My initials: JAAP
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