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How do I make glycerol solidify?
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I have read discussions that mention making fire logs out of used glycerol. While my glycerol will solidify at cooler temperatures, it is still a thick semi-liquid slop at room temperature. Is there something I can add to it to make it harden at higher temperatures? I am planning on stuffing milk cartons with finely shredded paper and pouring the glycerol in with it.
 
Location: Winnipeg, MB | Registered: July 31, 2008Reply With QuoteReport This Post
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Have you removed the methanol? That should make it firm up.

Norman
 
Location: Lincoln, NE | Registered: April 10, 2006Reply With QuoteReport This Post
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Also, glycerol from an NaOH batch will generally be firmer than that from a KOH batch. Not sure what caustic you are using, but switching to NaOH will give you more solid byproduct.

Cheers, John
 
Registered: June 17, 2007Reply With QuoteReport This Post
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methanol is what makes it burn. If you let the glycerin sit for awhile some of the methanol will evaporate out making it firmer, make sure its in a well ventilated area.



 
Registered: April 28, 2008Reply With QuoteReport This Post
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quote:
Originally posted by StorminNorman:
Have you removed the methanol? That should make it firm up.

I have used it as a prerinse for the next batch, which should have transfered some of the methanol to the oil, but I haven't formally boiled off the methanol. I'll give this a try.
 
Location: Winnipeg, MB | Registered: July 31, 2008Reply With QuoteReport This Post
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I have some demethed koh byproduct, it is slightly more solid than grease at room temp. Tom


" I don't know what I don't know until I know"
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Location: Manitoba Canada | Registered: March 24, 2009Reply With QuoteReport This Post



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If it's NaOH glyc then once the methanol has gone it will set solid, I cant remember who, but someone who does WBD drains their glyc into a drum conatining sawdust and when it solidifies cuts it up into smaller sizes and wraps the chunks in newspaper ready for burning.


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Location: S.E. England | Registered: September 05, 2004Reply With QuoteReport This Post
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quote:
Originally posted by Chug:
If it's NaOH glyc then once the methanol has gone it will set solid, I cant remember who, but someone who does WBD drains their glyc into a drum conatining sawdust and when it solidifies cuts it up into smaller sizes and wraps the chunks in newspaper ready for burning.

Thats a great idea, I have thought about using a cement mixer for this purpose and then pouring it out into cardboard cartons before it hardens but that is just adding more time to my production... Razz
Jon
 
Location: Wellington County, Ontario Canada | Registered: February 07, 2008Reply With QuoteReport This Post
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Glycerin melts at about 18C, the solid mass we get at higher temps is caused by dissolved lye and soap. Water and methanol lower the freezing point quite dramatically. I think the sawdust idea might be a cheap solution.
 
Location: Nimbin Australia | Registered: December 04, 2007Reply With QuoteReport This Post
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