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Methanol evaporation question
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This is coming from a storage perspective. Some water methanol users are trying to figure out how to keep the methanol from evaporating from the water it is mixed in with. I can't find alot about methanol evaporation, but it seems that BDers are trying to get it to happen. Assuming a vented black tank mounted in the bed of a truck, what is the best way to keep the methanol from evaporating out the vent? From preliminary reading, it seems that a vent cooler than the tank is good for collecting it, so would a vent hotter than the tank be the best for keeping it in? What kind of evaporation rates would a 5 gallon container with 25% methanol vented through a 1/2" hose have? We stumbled into it on another forum and are trying to figure out if it is something to worry about.
 
Location: Mito, Japan | Registered: November 18, 2006Reply With QuoteReport This Post
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Plug the vent. If that's not possible, keep the liquid as cold as possible. You also could try an airlock - the liquid in it would absorb some of the vapors, and prevent free breathing which should also reduce evaporation. Is it really a big problem? I don't know, but consider that methanol is an ingredient in automotive windshield washer fluid, primarily there as an anti-freeze.
 
Location: Santa Cruz, Ca | Registered: July 29, 2006Reply With QuoteReport This Post
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Tanks are in the back of beds for truck guys, up to 35 gallons with water and methanol mixed in. I would think that a vent would be necessary.
 
Location: Mito, Japan | Registered: November 18, 2006Reply With QuoteReport This Post
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Why? Are they emptied on the fly somehow? Here 55gal(~210l)drums of methanol are hauled and stored w/o venting in things like shipping containers.
 
Location: Santa Cruz, Ca | Registered: July 29, 2006Reply With QuoteReport This Post
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Working this same issue Shaman, but in the engine compartment on my boat. Heat an issue in there also, I'm mounting a 4gallon fuel cell for water/methanol storage.

Probably going with a small check valve that will only allow air into the tank. That could be mounted into a T pipe fitting along with a 15PSI pressure release [pop off] valve. Check grainger.com or mscdirect.com .

So if the pumps pulling liquid it will open the check valve, otherwise it's a sealed tank. The pop off would release if for some reason the tank overheated and became pressurized.. Best I could come up with so far.

-Ken


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Location: Southeastern Ohio | Registered: January 10, 2008Reply With QuoteReport This Post
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Kenr34
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Posted June 14, 2011 06:26 PM Hide Post
Working this same issue Shaman, but in the engine compartment on my boat. Heat an issue in there also, I'm mounting a 4gallon fuel cell for water/methanol storage.

Probably going with a small check valve that will only allow air into the tank. That could be mounted into a T pipe fitting along with a 15PSI pressure release [pop off] valve. Check grainger.com or mscdirect.com .

So if the pumps pulling liquid it will open the check valve, otherwise it's a sealed tank. The pop off would release if for some reason the tank overheated and became pressurized.. Best I could come up with so far.

-Ken



I was with you on the check valve, I did the same thing with the little tank I had in the back of the hatch. Didn't want the fumes, but didn't want to stress out the pump.
 
Location: Mito, Japan | Registered: November 18, 2006Reply With QuoteReport This Post



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If you must vent it be sure to do it where the fumes will not be returning inside; methanol is toxic.



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Location: :-) Great White North eh ? | Registered: December 10, 2004Reply With QuoteReport This Post
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Good advice, probably reason I'm going blind, working with this crap every day.

-Ken


Recycling & Green Fuels Research: www.altfuelsgroup.org
Ozone Eating Toys For Big Boys !!: www.suncoastexotics.com
Carefully Maintaining A Carbon Neutral Footprint...
 
Location: Southeastern Ohio | Registered: January 10, 2008Reply With QuoteReport This Post
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