Go Back   Chemistry Help Forum > Chemistry Forums > High School Chemistry Forum

High School Chemistry Forum Ask your high school chemistry questions here.

Reply
 
Thread Tools Display Modes
Old Mar 30th 2018, 04:33 AM   #1
Theothecat
Junior Member
 
Join Date: Mar 2018
Location: Atlanta, GA
Posts: 1
Theothecat is on a distinguished road
Co2 scrubber with sodium hydroxide and/or lithium hydroxide

Ok, so me and a friend want to build our own co2 scrubber. After some reasearch, we narrowed down 2 substances- Sodium hydroxide and lithium hydroxide.
We are wondering if anyone can help us, design and work out the chemistry needed to accomplish our task.
Theothecat is offline   Reply With Quote
Old Mar 30th 2018, 11:00 PM   #2
oz93666
Member
 
Join Date: May 2017
Location: thailand
Posts: 87
oz93666 is on a distinguished road
I think the only reason lithium comes up in relation to this is because it's lighter ... a prime consideration for Apollo missions ...they used LiOH

So sodium hydroxide is your best bet , easily obtainable and cheap , from hard wear stores in the form of beads about 4mm diam ...of sometimes flakes ...

If I were doing this I would make a vertical transparent colomb , perhaps out of plastic water bottles , fill it up with the hydroxide pellets , and feed air in through the bottom , so it passed up the colomb in between the space between the pellets , coming out the top where it should have a greatly reduced C02 and H2O content ...

Over time the pellets will get wet , the solution dripping down through the colomb , you will have to catch this some how ...it's very nasty and caustic !!

After a while you will have a lot of solution , you have to get the air incontact with this to remove the CO2 to make full use of the hydroxide

2NaOH + CO2 = ............

A much less messy alternative could be carbon , it will be bulkier , a big drum full of C with air in one end and out the other , any charcoal should work, barbecue charcoal ... and when it's full of CO2 you can easily regenerate it driving off the CO2 with fresh air

see here ... https://en.wikipedia.org/wiki/Carbon_dioxide_scrubber

Last edited by oz93666; Mar 30th 2018 at 11:05 PM.
oz93666 is offline   Reply With Quote
Old Apr 2nd 2018, 12:34 PM   #3
chemsurvival
Junior Member
 
Join Date: Apr 2018
Location: USA
Posts: 3
chemsurvival is on a distinguished road
I am curious to know the purpose of this scrubber: this is only because this was posted in a high school chemistry forum and the materials suggested are highly caustic and should only be handled and used independently by a properly trained scientist or engineer. If you (or anyone reading this thread) are trying to build a re-breather without the proper training or oversight, I implore you reconsider before you hurt yourself. If you are instead interested in scavenging carbon dioxide for some other purpose, please elaborate so that we can offer the safest possible solutions to your chemistry challenge!
chemsurvival is offline   Reply With Quote
Reply

  Chemistry Help Forum > Chemistry Forums > High School Chemistry Forum

Tags
environment, physical chemistry



Thread Tools
Display Modes



Facebook Twitter Google+ RSS Feed