Warning
Warning: This fuel and by-products of combustion with this fuel contain chemicals known to the state of California to cause cancer, birth defects, or other reproductive harm.
This is a warning label on a canister of Coleman propane fuel. I wonder if a similar label will be printed on the LNG tankers or on the storage tanks.
This is a warning label on a canister of Coleman propane fuel. I wonder if a similar label will be printed on the LNG tankers or on the storage tanks.
posted by The Guy Who Writes This at 6:54 PM
8 Comments:
bonus post night, huh?
Another education from Guy.
You're becoming my eyes and ears to the world and all it's crazy (and scary) phenomenon.
You're also teaching me to be on the lookout for myself.
Damn it, I wanted to save this as a draft and work on it some more, but I screwed up. If there's no photo, I didn't intend to post it. Damn...
Ok Ok, I have had ENOUGH. Since when in your sub medial cranium has it become acceptable to disseminate information in a less then truthful way? Since when has LNG, liquefied natural gas, a homologous gas made up of primarily methane, CH4
been any ware near the composition of propane C3H6 a completely different compound. You complain about the use of marginal intellect in disseminating information, how about a little self evaluation
So there are no health or atmospheric concerns that come from the burning of LNG? There are no concerns with the venting of LNG while it is being transferred and reconstituted? LNG is anything but Natural Gas. Try as you might to convince the world that your gas is safe. If it burns, it isn't.
I don't see why, considering our food from China and other countries is probably totally tainted and there's no labels there. Or am I just cynical?
The analogy of burning methane and the formation of a compound that “MAY” be present in the burning of propane are two totally different things.
Propane :
Propane undergoes combustion reactions in a similar fashion to other alkanes. In the presence of excess oxygen, propane burns to form water and carbon dioxide.
C3H8 + 5O2 → 3CO2 + 4H2O + heat
When not enough oxygen is present for complete combustion, propane burns to form water and carbon monoxide.
2C3H8 + 7O2 → 6CO + 8H2O + heat
Unlike natural gas, propane is heavier than air (1.5 times denser). In its raw state, propane sinks and pools at the floor. Liquid propane will flash to a vapor at atmospheric pressure and appears white due to moisture condensing from the air.
When properly combusted, propane produces about 2,500 BTU per cubic foot of gas.
Propane is nontoxic; however, when abused as an inhalant it poses a mild asphyxiation risk through oxygen deprivation. It must also be noted that commercial product contains hydrocarbons beyond propane, which may increase risk. Propane and its mixtures may cause mild frostbite during rapid expansion.
Propane combustion is much cleaner than gasoline, though not as clean as natural gas. The presence of C-C bonds, plus the multiple bonds of propylene and butylene, create organic exhausts besides carbon dioxide and water vapor during typical combustion. These bonds also cause propane to burn with a visible flame
Methane:
The primary component of natural gas is methane (CH4), the shortest and lightest hydrocarbon molecule. It also contains heavier gaseous hydrocarbons such as ethane (C2H6), propane (C3H8) and butane (C4H10),
Component wt. %
Methane (CH4) 70-90
Ethane (C2H6) 5-15
Propane (C3H8) and Butane (C4H10) < 5
CO2, N2, H2S, etc. balance
Nitrogen, helium, carbon dioxide and trace amounts of hydrogen sulfide, water and odorants can also be present. Mercury is also present in small amounts in natural gas extracted from some fields. The exact composition of natural gas varies between gas fields. Processed natural gas that is available to end-users is tasteless and odorless, however, before gas is distributed to end-users, it is odorized by adding small amounts of odorants (mixtures of t-butyl mercaptan, isopropyl mercaptan, tetrahydrothiophene, dimethyl sulfide and other sulfur compounds), to assist in leak detection. Processed natural gas is, in itself, harmless to the human body, however, natural gas is a simple asphyxiant and can kill if it displaces air to the point where the oxygen content will not support life.Natural gas is lighter than air, and so dissipates into the atmosphere. But when natural gas is confined, such as within a house, gas concentrations can reach explosive mixtures and, if ignited, result in blasts that could destroy buildings. Methane has a lower explosive limit of 5% in air, and an upper explosive limit of 15%.
Explosive concerns with compressed natural gas used in vehicles are almost non-existent, due to the escaping nature of the gas, and the need to maintain concentrations between 5% and 15% to trigger explosions.
Very nice comparison.
I just don't think we should continue burning things for energy. It doesn't seem to be working out for us.
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