Taymar
A woman i do gardening for has a can of this in her shed for a small flamethrower thing that is meant to burn small path weeds.
Its mix is
30% propane
70% butane
Will this be any good to use as fuel?
30% Propane, 70% Butane Mix, Any good?
GEt the chemical equation for the combustion of propane and butane with oxygen. Make sure there are no other chemicals in the can. Stoichiometry may be difficult to use in figuring this out so maybe just experiment.
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jimmy101
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If the can really only contains propane and butane then the stoichiometry is pretty simple.
Method 1: Just take the weighted average of the fuel ratios for the two fuels;
30% butane which is used at 3.12% (squirt-and-screw method)
70% propane which is used at 4.02% (squirt-and-screw method)
Volume percent of fuel is;
(0.30)(3.12%)+(0.70)(4.02%) = 3.75%
(this is only approximately but close enough for most purposes)
Method 2: The balanced chemical equation is;
3C<sub>4</sub>H<sub>10</sub> + 7C<sub>3</sub>H<sub>8</sub> + (109/2)O<sub>2</sub> = 33CO<sub>2</sub> + 43H<sub>2</sub>O
or
6C<sub>4</sub>H<sub>10</sub> + 14C<sub>3</sub>H<sub>8</sub> + 109O<sub>2</sub> = 66CO<sub>2</sub> + 86H<sub>2</sub>O
For every 6+14=20 volumes of fuel we need 109 volumes of oxygen.
Since air is only 21% oxygen;
(20/109)*(0.21) = 3.85% fuel in air.
Method 1: Just take the weighted average of the fuel ratios for the two fuels;
30% butane which is used at 3.12% (squirt-and-screw method)
70% propane which is used at 4.02% (squirt-and-screw method)
Volume percent of fuel is;
(0.30)(3.12%)+(0.70)(4.02%) = 3.75%
(this is only approximately but close enough for most purposes)
Method 2: The balanced chemical equation is;
3C<sub>4</sub>H<sub>10</sub> + 7C<sub>3</sub>H<sub>8</sub> + (109/2)O<sub>2</sub> = 33CO<sub>2</sub> + 43H<sub>2</sub>O
or
6C<sub>4</sub>H<sub>10</sub> + 14C<sub>3</sub>H<sub>8</sub> + 109O<sub>2</sub> = 66CO<sub>2</sub> + 86H<sub>2</sub>O
For every 6+14=20 volumes of fuel we need 109 volumes of oxygen.
Since air is only 21% oxygen;
(20/109)*(0.21) = 3.85% fuel in air.
