Which gas is mixed with propane to detect its odour?
- Dr WLv 72 months ago
Thiols and mercaptans are a CLASS of organic molecules. They are two different names for the same class
.. R - SH
where R is any organic C-H chain. (alkyl and aryl included)
here's an example
n-butyl mercaptan.... n-butanel thiol..... butan-1-thio are all names for that 1 compound.
mercaptans (aka thiols) are generally very pungent. n-butyl mercaptan smells like skunks. And mercaptans can commonly by detected by human noses is very small concentrations. less than 1 part per billion.. ppb
t-butyl mercaptan is 1 chemical used as odorants in natural gas and propane.
.. .. . ..CH3
. . .. . ..|
CH3 - C - SH
.. .. .. . |
. .. .. .CH3
it has an odor threshold of 0.3 ppb and you know the smell
another is ethyl mercaptan
and another is methyl mercaptan aka methane thiol
. CH3-S-CH3.. .. . .dimethylsulfide
.. CH3-CH2-CH2-SH... . n-propyl mercaptan
.. CH3-CH(CH3)-SH.. . ..isopropyl mercaptan
often odorants are manufactured by a chemical company and are specific blends of those chemicals + others depending on the application and the gas they are used to odorize. For example
.. Scentinal A (by Chevron) is 99% ethyl mercaptan.
.. Scentinal N is 75% t-butyl and 25% isopropyl mercaptan
.. Scentinal F-20 is 80% t-butyl and 20% dimethyl sulfide (CH3)2S
.. Scentinal T is thiophane (cyclic C4H8S)
.. Scentinal P is n-propyl, isopropyl and n-butyl mercaptans
.. Scentinal O a blend of 6 different sulfides and mercaptans.
.. Scentinal H hexane + t-butyl mercaptane (20%)
.. Scentinal Eis n-propyl, isopropyl and n-butyl mercaptans
All of which COULD be used to odorize propane. Which one is used depends on (1) local standards, (2) local availability, (3) cost, the propane supplier, etc. All of them are compounds containing sulfur.
- regeruggedLv 72 months ago
Mercaptan. Smells like sulphur.