Re: Bright green gas
Posted by Fish'n Jim On 2018/7/31 20:48:36
If you're expecting nice clear colorless gasoline, you're unfortunately mistaken in this day and age.
These are the starting jars. 3 Ethanol(EtOH) on the left, but not immediately distinguishable by color compared to EtOH free. As you can see, it's bright yellow to start with. The cloudy one is the one with 1 vol% water which by the way does not dissolve, and upon shaking becomes turbid as shown. What happens is H2O extracts some of the EtOH and forms a separate phase layer. That's why I suspected the green gas had water in it, but it could be particulate.
These gasolines were obtained locally by me in 14 gal EtOH, 5 gal EtOH free, quantities from the Shell station within the last 2 weeks. The ethanol free is listed as a non-Shell product. Gas in this area comes from Tx via pipeline. I suspect it has a fair amount of iron in it, but only parts of a ppm Fe are needed to impart yellow. There's also the additives that could be giving color. [I'm not sure if it's coming from dye in these cases(89 octane rated) for inventory purposes, either.] There's a comparative color scale they use for specs, and I used to have it eyeballed but I'm far removed from that now.
I'll leave these capped up*, no air and if nothing happens, then I'll vent them to let air in as you'd have in your tank.
Doesn't look like it'll take much to change the hue to green, but I never intentionally bias the experiments.
For the record, there's 200 ml of gas in each, and 2 x (2.3 gm ea) 1" of 1/4 Cu tube, all I did was rinse in gas and dry excess.
The brass is two 1/8" male flare nuts.
Temperature 80F.
ps: you have to also consider the distribution and most comes from terminals and the trucks carry different grades in the same truck and usually without cleaning between loads. Blending for brand additives is allowed. But I've seen the same fuel, from the same tank, go from the brand station to the independent unbranded station back in the day.
* - I put the metal lids(canning type) on after the photos as the plastic were leaking a bit. I don't need a fire in the garage.
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These are the starting jars. 3 Ethanol(EtOH) on the left, but not immediately distinguishable by color compared to EtOH free. As you can see, it's bright yellow to start with. The cloudy one is the one with 1 vol% water which by the way does not dissolve, and upon shaking becomes turbid as shown. What happens is H2O extracts some of the EtOH and forms a separate phase layer. That's why I suspected the green gas had water in it, but it could be particulate.
These gasolines were obtained locally by me in 14 gal EtOH, 5 gal EtOH free, quantities from the Shell station within the last 2 weeks. The ethanol free is listed as a non-Shell product. Gas in this area comes from Tx via pipeline. I suspect it has a fair amount of iron in it, but only parts of a ppm Fe are needed to impart yellow. There's also the additives that could be giving color. [I'm not sure if it's coming from dye in these cases(89 octane rated) for inventory purposes, either.] There's a comparative color scale they use for specs, and I used to have it eyeballed but I'm far removed from that now.
I'll leave these capped up*, no air and if nothing happens, then I'll vent them to let air in as you'd have in your tank.
Doesn't look like it'll take much to change the hue to green, but I never intentionally bias the experiments.
For the record, there's 200 ml of gas in each, and 2 x (2.3 gm ea) 1" of 1/4 Cu tube, all I did was rinse in gas and dry excess.
The brass is two 1/8" male flare nuts.
Temperature 80F.
ps: you have to also consider the distribution and most comes from terminals and the trucks carry different grades in the same truck and usually without cleaning between loads. Blending for brand additives is allowed. But I've seen the same fuel, from the same tank, go from the brand station to the independent unbranded station back in the day.
* - I put the metal lids(canning type) on after the photos as the plastic were leaking a bit. I don't need a fire in the garage.
Attach file:
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