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  1. #1
    Join Date
    Dec 2013
    Location
    Fulton, mississippi
    Posts
    12

    Default Oxalic acid vapor timing

    This is my first spring with my bees. I amconsidering vaporizing oxalic acid. I have read on this forum that the oxalic need to go from the solid crystal to a gas without changing into a liquid first. I am having trouble getting it to do this. I have made several trial runs, with different on and off timings, but have not succeeded yet. I am using a homemade vaporizer I saw on this forum. I would appreciate any suggestion.

  2. #2
    Join Date
    Dec 2013
    Location
    North Okananagan BC Canada
    Posts
    77

    Default Re: Oxalic acid vapor timing

    I have no experience with this at all. But where did you find the information on the home made vaporizer? I would be interested in reading it.
    thanks

  3. #3
    Join Date
    Nov 2009
    Location
    Jacksonville, Florida
    Posts
    1,645

    Default Re: Oxalic acid vapor timing

    My home aid vaporizer turns the powder to a liquid and then it starts vaporizing and it kills lots of mites. I think what you have made will work. Just remember oxalic only kills the phoretic mites so you will have to do multiple treatments to make much of a difference.

  4. #4
    Join Date
    Dec 2013
    Location
    Fulton, mississippi
    Posts
    12

    Default Re: Oxalic acid vapor timing

    The thread is

  5. #5
    Join Date
    Dec 2013
    Location
    Fulton, mississippi
    Posts
    12

    Default Re: Oxalic acid vapor timing

    The thread is: [url]http://www.beesource.com/forums/showthread.php286888-Home-made-Vaporizer-design&highlight=oxalic +vaporizer

  6. #6
    Join Date
    May 2013
    Location
    victoria,canada
    Posts
    1

    Default Re: Oxalic acid vapor timing

    When oxalic acid is heated it goes from a solid to a liquid. As the temp incresses it then turns to a gas.With my vaporizer it takes apx 60 seconds to go to liquid then starts gassing off. After 2 mins. it is finished.

  7. #7
    Join Date
    Dec 2008
    Location
    SOMERSET, ENGLAND
    Posts
    335

    Default Re: Oxalic acid vapor timing

    The stuff one buys is usually oxalic acid dihydrate, which is a crystal which has two water molecules attached to each oxalic acid molecule.


    1) The water of hydration leaves at 101.5 C (214.7 F) The water boils off leaving anhydrous oxalic acid crystals.
    2) At 157 C (314.6 F) the oxalic acid starts to sublime (goes directly from solid to gas)
    3) At 189 C (372.2 F) the oxalic acid which has not yet sublimed decomposes to formic acid and carbon monoxide.

  8. #8
    Join Date
    Feb 2006
    Location
    Massillon, Ohio
    Posts
    3,406

    Default Re: Oxalic acid vapor timing

    Quote Originally Posted by beekuk View Post
    1) The water of hydration leaves at 101.5 C (214.7 F) The water boils off leaving anhydrous oxalic acid crystals.
    So, is the liquid seen in the bowl during vaporization the water boiling off?
    To everything there is a season....

  9. #9
    Join Date
    Dec 2008
    Location
    SOMERSET, ENGLAND
    Posts
    335

    Default Re: Oxalic acid vapor timing

    It is in the evaporator i use, Mike.

    But it is for a very short time, as the whole process only takes 25 seconds from start to Finnish, this is a pressure evaporator.

    With the passive evaporators, which are used from cold, it would also have to go through the stage during heating up where the water content would be boiling off.

    Video of one of the tailor made passive evaporators.

    http://www.youtube.com/watch?v=32eeVDJ5JqQ
    Last edited by beekuk; 03-01-2014 at 09:56 PM.

  10. #10
    Join Date
    Mar 2013
    Location
    Corner, Al
    Posts
    28

    Default Re: Oxalic acid vapor timing

    Im building one using a rex c100. keep the bowl warm until vapor heat is selected. Could put a timer on the vapor heat so it would be "set and walk away". Shows real time temp of the bowl. 40 watt soldering iron /w decal remover tip for the heat source and thermocouple mounting point. Precise temp control (according to the spec sheet... it is the cheapest temp controller on the auction site... make sure to get the proper voltage input.). Use extension cord or cheap convertor and a battery. Use an outdoor outlet box to mount it in. Got all the parts in front of me right now... Just haven't put it all together. Not a lot of $$$ to build.

  11. #11
    Join Date
    Sep 2012
    Location
    Orange, Texas
    Posts
    47

    Default Re: Oxalic acid vapor timing

    If allowed to go past the temp required to turn it into formic acid, would that formic vapor be an effective treatment?

  12. #12
    Join Date
    May 2011
    Location
    Algoma dr. Ontario, Canada
    Posts
    811

    Default Re: Oxalic acid vapor timing

    Only a portion of the converted gas will be formic acid; water vapor plus carbon monoxide are also part of the breakdown components. The initial charge of OA crystals is only 2 grams to start with while a normal effective dose of 65% Formic acid is usually in the neighborhood of 30 grams.

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