I've read of a chemical process in which naoh could be turned into nah
using only heat in the overall process.

I currently own and am experimenting with sol. furnaces ranging up to
1400 deg. celsius.

Step 1: NaOH + Na --> Na2O + 1/2 H2
Step 2: Na2O + heat --> Na + 1/2 O2
Step 3: Na + 1/2 H2 --> NaH

Overall:  NaOH + heat --> NaH + 1/2 O2 

I would like to use my furnace to convert small (few pounds) amounts
of naoh into nah. can you give me (general) information on how to do
this if it is possible on the domestic scale (in your opinion) and
approximately how much will  the extra equipment cost? (except
furnace)

by the way I know of a different , similiar, process-
2 NaOH + 2 CH4  --->   2 Na + 5 H2  +  2 CO 
requiring methane and 1000 deg.cel. , but I am worried about the CO emmisions..
 

thanks

I don't have an answer for you except to question your proposed
mechanism.  Where do you plan on getting the elemental sodium from?  I
would be more worried about handling that than the CO emissions.

actually when i read this again , the post was false!
the second process if i see correctly is

Na2O+heat ---> 2Na + 1/2 O2

so basically your'e supposed to be in some 'closed Na loop' where you
start with an amount of Na and then retrieve and reuse it in the
overall process.

what I meant about CO emmisions isn't that it would be unsafe for me
personally but the process itself isn't enviromentally plausible on a
larger scale.
I plan to start producing NaH 'fuel' by the second method and
meanwhile research a different one safer for the enviroment.