[NorPene Solutions]

Originally Posted by A6 Grower

I have a chest freezer filled with 50/50 glycol and water. Its been working ok. Recently i tossed a few cheapo harbor freight fountain pumps in there to move the glycol around as it was freezing around the edges and top but liquid in the center. Now the whole thing is a nice orange slushy mixture that holds the -10f my freezer gets it to much much longer. Even with a hot lab at 80f my glycol is only at 0f at the end of my 10 hour days. Poor freezer works 24/6 probably. the sides get a little warm to the touch, i'm wondering how long she'll last.

Was pleasantly surprised the little mag driven fountain pumps were able to work as well as they do.

Are you using the same type of pump for pumping the 50/50 mix to an IC69?

[Gray Wolf]

Originally Posted by mrsmarybrown

Could a 50/50 mix of Methanol and water be placed in a chest freezer or would that pose too high of a safety issue.

Read link @:https://www.che.sc.edu/faculty/weidne...H_Solution.pdf

Flammability issues of mixtures:

If you hold a match over pure MeOH in air a fire is likely because the MeOH vapor over the liquid is within the flammability limits.

Looking at the other end if you have 99 per cent water - 1 per cent MeOH by weight and you hold a match over the liquid in air what happens? Nothing I expect.

Question is what happens between 1% and 100% MeOH. Adding to the problem are the different evaporation rates of the MeOH and water....

The following values were used in the calculation,

For Methanol:

Flash point = 12.22 °C
Upper Flammability Temperature = 43 °C
Lower Flammability Temperature = 7 °C
Upper Flammability Limit = 36.5% (by volume)
Lower Flammability Limit = 6 % (by volume)
Ignition Temperature = 350 °C

(Source: The Methanol Institute, Washington, DC 20006 - https://www.methanol.org)

[NorPene Solutions]

Originally Posted by Gray Wolf

Link:https://www.che.sc.edu/faculty/weidne...H_Solution.pdf

Flammability issues of mixtures:

If you hold a match over pure MeOH in air a fire is likely because the MeOH vapor over the liquid is within the flammability limits.

Looking at the other end if you have 99 per cent water - 1 per cent MeOH by weight and you hold a match over the liquid in air what happens? Nothing I expect.

Question is what happens between 1% and 100% MeOH. Adding to the problem are the different evaporation rates of the MeOH and water....

The following values were used in the calculation,

For Methanol:

Flash point = 12.22 °C
Upper Flammability Temperature = 43 °C
Lower Flammability Temperature = 7 °C
Upper Flammability Limit = 36.5% (by volume)
Lower Flammability Limit = 6 % (by volume)
Ignition Temperature = 350 °C

(Source: The Methanol Institute, Washington, DC 20006 - https://www.methanol.org)

Thanks GW!

[Permacultuure]

Originally Posted by tommy_greens

Dont see a poly sci model that goes to -40.
Have you used one of their chillers successfully to reach cryo temps?

https://www.labdepotinc.com/Product_D...pid~60529.aspx

Their immersion chillers get down to -80.

I don't have one of their chillers, but Regis does, and has struggled to get it to -40, last I heard.

Recirculating chillers are taxed, domestic made 20l -80c quotes were 30k plus. Across the sea they are about 5k.....

[A6 Grower]

Originally Posted by mrsmarybrown

Are you using the same type of pump for pumping the 50/50 mix to an IC69?

My coils are IN the freezer thats filled with glycol. Im not pumping the glycol anywhere it stays in the freezer along with 4 coils. The pumps in the freezer just move glycol around to create a more even temp...

I do plan on using one of these pumps next week to pump glycol out of my freezer and through the coil condenser on my rotavap thats coming monday. Ill let you know how that goes.

[Dab Strudel]

Originally Posted by A6 Grower

I have a chest freezer filled with 50/50 glycol and water. Its been working ok. Recently i tossed a few cheapo harbor freight fountain pumps in there to move the glycol around as it was freezing around the edges and top but liquid in the center. Now the whole thing is a nice orange slushy mixture that holds the -10f my freezer gets it to much much longer. Even with a hot lab at 80f my glycol is only at 0f at the end of my 10 hour days. Poor freezer works 24/6 probably. the sides get a little warm to the touch, i'm wondering how long she'll last.

Was pleasantly surprised the little mag driven fountain pumps were able to work as well as they do.

haha id love to try this but back when I had it filled with ice i had to chizzle the ice away to get the tank out once and realllllly dinged the inside of the thin metal. maybe I can flex seal or silicone the holes and proceed with caution... Id drill holes and silicone them to still make the coils self draining :0

[Dab Strudel]

Whats the chances Glycol, Methanol, and Water/Ice would be a better mixture?

[A6 Grower]

I did the same thing. I just sealed them with epoxy and silicone on top. Works fine unless you made some crazy big holes. And obviously now you have to be careful not to scrape the patch off. Or just spend $600 on a new freezer. I ended up going that route after fixing the holes. Successfully, but the freezer was old and didn't work that great so i got a kenmore elite freezer that goes down to -30F. Gets my glycol down to -10F no problem and holds that for most of the day and gets to about 0f or 10f if it's a long day. I toss some DI in there when its the end of the day and i need some colder solvent but my days go like this, run good stuff first and shitty stuff last. Lots of differnt stuff from differnt people every day. Make the temperature thing not a big deal for me. Im just happy i havent bought ice in months and buy DI every once and a while. And i only need like $20 worth for two or 3 days lol

[Oil Crisis]

I tried making a chiller for prechilling my tane before injection. I used a 60/40 blend of glycol/water. I set 8lbs of dry ice in a cooler and pored the solution into the cooler and set my 3/8x 50' coil in it. I was rockin -30 on first injection. I let it soak for 20 mins and dumped. recovered to same rc tank by puttting it on ice with my second coil that was already on ice.
After recovery, I tried to inject again and I ran into some problems, my tane wasnt moving. Was it too cold and could I have froze the butane? I thought butane freezes at -200. I had to take it out of my glycol bath before it would move to the injection port again. What was I doing wrong? I thought that the vapor from the tank should've pushed it though as it did the first time? Is a 30 lb tank too small for vapor assistance? I'm thinking if I get a second 50 lb tank and use that for "warm vapor" and injection and my 30 for recovery would that work?

[Gray Wolf]

Originally Posted by Oil Crisis

I tried making a chiller for prechilling my tane before injection. I used a 60/40 blend of glycol/water. I set 8lbs of dry ice in a cooler and pored the solution into the cooler and set my 3/8x 50' coil in it. I was rockin -30 on first injection. I let it soak for 20 mins and dumped. recovered to same rc tank by puttting it on ice with my second coil that was already on ice.
After recovery, I tried to inject again and I ran into some problems, my tane wasnt moving. Was it too cold and could I have froze the butane? I thought butane freezes at -200. I had to take it out of my glycol bath before it would move to the injection port again. What was I doing wrong? I thought that the vapor from the tank should've pushed it though as it did the first time? Is a 30 lb tank too small for vapor assistance? I'm thinking if I get a second 50 lb tank and use that for "warm vapor" and injection and my 30 for recovery would that work?

Water content or too cold will solidify the butane.