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I am doing an experiment for a miticide for honey bees. I will be dissolving 600 g of 99.6 % oxalic acid in one liter vegetable glycerin at 150 °F (65 °C). I have been told it will give off formic acid fumes while mixing and heating. I don't think it will until it get to the melting temperature of oxalic acid. Is there any safety concern? Also what would the shelf life of the mixture be?

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You might want to raise the temperature a little bit as the reaction proceeds at 100-110°C to form formic acid. If the temperature is further raised to 260-280°C, then the reaction will proceed to form allyl alcohol.

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Formic acid has almost unlimited shelf life if unopened and is protected from heat and light sources. Allyl alcohol is stable in normal storing conditions but it may polymerize into a thick syrup if left untouched for several years.

Discussing about safety concerns is pretty much off-topic here but you might want to check the safety data-sheets: formic acid and allyl alcohol.

Here is a research paper for further reading.

Reaction sources: Google Images

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    $\begingroup$ "Formic acid has almost unlimited shelf life if unopened and is protected from heat and light sources." I have read it needs to be stored with a vent because of slow decomposition $\ce{HCOOH -> H2O + CO}$ $\endgroup$
    – Poutnik
    Oct 12, 2019 at 5:36

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