anyone have any thoughts on the use of a brushless drill to mix methoxide? they don't spark and are completely enclosed, so should reduce the risk of fire. more risky than a circulating pump since you would still be standing over the mixing vessel. would still mix outdoors to reduce other risks.
I would not use it on an open top container. You dont only have to worry about the brushes, there is also the switch and possibly other sparking items such as an overload, speed controller, etc...
Simple schematic for a pump and heater control with a high limit
Sensor for the biodiesel/glycerin layer
I have a two part opinion about drills. First is they spark like crazy, which of course you have addressed, second is they have handles that put you at ground zero if anything does go wrong. ie, you don't hold mixing pumps in your hands.
I take the hard line of don't use drills to mix anything with methanol because after welding/grinding on tanks and drums, it's been proven to be the most lethal thing you can do in biodiesel. That said, there are plenty of people that have figured out how to use them without getting 3rd degree burns or burning down their home.
Oh the memories...
I'm one of those guys Rick speaks of. We used a regular hand drill with a 5-gallon bucket setup, covered with a snap on lid and hole punched in it for the mixing rod. I feel we were just lucky and can't recommend doing it. We moved away from that setup after a few successful batches, soon as we found a better design.
Do you have an air compressor?
If so, might I suggest a cheap air grinder in place of the brushless drill. Somewhere on here there is a link with pictures of our old setup. Basically just a 15 gallon stand tank, screw on lid, with a couple bearings holding the mixing rod and air grinder to the lid. Even with just an old 110v 15 gallon compressor, it mixed several hundreds of gallons of methanol and lye to perfection. Our current design is just a scaled up version with an air motor and 80 gallon compressor powering it.
The main thing that Rick's listed, is getting your body far away from that mixer. Methoxide is nasty enough stuff with minimal casual contact, ya never want to risk breathing the fumes or taking a bath in it. Take it from a long time brewer, some things are just not worth the long term health risk...
thanks for the replies. haha, i would never DREAM of using a normal drill anywhere near methoxide.
yeah, an air powered mixer is pretty much the best option. i looked at some, but they were expensive. i will have to look into the grinder.
yeah i definitely want a mixing tank that i don't have to be near when it's going.
tank would have to be sealed, vented, and metal before i'd do it indoors.
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