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Calculation For Vapor Ppm Of Formaldehyde In Batch
#1
Posted 15 August 2020 - 09:30 PM
#2
Posted 15 August 2020 - 11:17 PM
https://webbook.nist...D=C50000&Mask=4
Hi,
You need more data like the total pressure on the sky of the reactor, the other components if any like (water ,etc)
The link above is about vapor pressure of formaldehyde.
Note :don't mix up PPM mol and PPM mass .
Hope this is helping you
Good luck
Breizh
Edited by breizh, 15 August 2020 - 11:18 PM.
#3
Posted 16 August 2020 - 12:41 AM
Thank you very much for your reply Breizh!
I have attached the SDS of the curative, but I do not know exact composition because it is proprietary.
When you say total pressure in the "sky" of the reactor, do you mean headspace--in other words the space above the liquid? I am not sure how to obtain that info as there is very little head space in a banbury mixer. Typically its 90-100% full in order to generate more shear with the blades.
Am I correct in determining to use vapor pressure to calculate vapor generated in ppm, rather than the hand calculation shown in the picture?
Thanks,
Humza Ahmad sds.PDF 121.22KB 6 downloads
Edited by ahumza94, 16 August 2020 - 12:42 AM.
#4
Posted 16 August 2020 - 01:00 AM
hi,
Yes I think so !
Sky = head space
note :3*0.1 %= 0.003 lb not 0.3 lb .
In the worst case ( lack of data) you may consider that all the formalin is passed to the vapor phase (head space)
Good luck.
Breizh
Edited by breizh, 16 August 2020 - 03:17 AM.
#5
Posted 16 August 2020 - 03:18 PM
Oh boy, I can't believe I missed that. Thanks Mr. Breizh. that would bring our concentration down to around 15ppm which makes a ton of more sense.
Humza A
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