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Thread: Practicalities of measuring liquids on a larger scale

  1. #1
    Join Date
    Mar 2019
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    VIC
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    8

    Practicalities of measuring liquids on a larger scale

    Hey guys,

    A while ago I asked about a confusing soap problem with my biodiesel, and thanks to the awesome knowledge of everyone here, I managed to start making some top quality bio diesel!!! Took me a while due to university stuff but finally got there

    Anyway, now I want to build a small scale reactor, but I have no clue how to accurately measure out the bigger quantities of liquid needed. For my 1 Litre batches, I just bought measuring cylinders from a local lab supply shop. For my reactor, I will be starting off with a small 20L reactor, so I'll need something like 20L of oil and 4L of methanol. I can't think of anything to give me an accurate measurement for these quantities. I thought of potentially weighing the reactants, but that would get quite messy as you need to consider temperature, impurities, etc. How do you guys measure your liquids?

    I'm also having difficult finding carboys or any such appropriate container for the initial filtration/settling of my WVO. Does anyone know where I can buy these? I'm based in Melbourne.

    Thanks for all your help, I should have a complete reactor by the end of the month!!

  2. #2
    Join Date
    Jan 2006
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    ลึก ประเทศอินเด&
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    2,092

    Re: Practicalities of measuring liquids on a larger scale

    Hi Arvin,
    Quote Originally Posted by Arvin View Post

    Anyway, now I want to build a small scale reactor, but I have no clue how to accurately measure out the bigger quantities of liquid needed... For my reactor, I will be starting off with a small 20L reactor, so I'll need something like 20L of oil and 4L of methanol...
    When I was making 20 litre batches of biodiesel I used a 2 litre plastic container with measurements marked on the side.
    Fill it up 10 times to the 2 litre mark and you have 20 litres of oil.
    I still measure out my methanol that way.


    Last edited by tillyfromparadise; 4th June 2019 at 09:17 PM.

  3. #3
    Join Date
    Sep 2009
    Location
    Brisbane (North Side)
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    767

    Re: Practicalities of measuring liquids on a larger scale

    All you need is a set of bathroom scales. Place the larger vessel on the scales. If you want 20 litres, add 20 kg of water. Mark the level. Tip it out and refill with oil.

    Tip: if you want 20L of bio, you will need a container that will hold 24L plus expansion and freeboard.
    Regards,

    Cade.

    2006 Landcruiser HDJ100 (1HD-FTE) 20,000 on bio
    2006 Ford Courier(WLT Motor), 10,000 on bio
    2002 Landcruiser HZJ105r (1HZ motor) 250,000 on bio (sold)
    2006 Mazda B2500 (WLT motor) 80,000 on bio (sold)



  4. #4
    Join Date
    Nov 2010
    Location
    Fort Worth, Texas, USA
    Posts
    302

    Re: Practicalities of measuring liquids on a larger scale

    Vegetable oil expands when it is heated. I had a hot vegetable oil bath overflow due to expansion of the hot oil. I don't know how to calculate that mathmatically. It might be measured empirically by just doing it , then measuring the change in volume at temperature.

  5. #5
    Join Date
    Sep 2009
    Location
    Brisbane (North Side)
    Posts
    767

    Re: Practicalities of measuring liquids on a larger scale

    Quote Originally Posted by WesleyB View Post
    Vegetable oil expands when it is heated.
    hence my statement "Tip: if you want 20L of bio, you will need a container that will hold 24L plus expansion and freeboard."

    expansion is not the bigger concern. in order to mix it thoroughly enough, you need a lot higher sides than to account for just the expansion if you dont want a wet slippery floor.

    my 300 litre hot water tank is just perfect for a 200L batch.
    Regards,

    Cade.

    2006 Landcruiser HDJ100 (1HD-FTE) 20,000 on bio
    2006 Ford Courier(WLT Motor), 10,000 on bio
    2002 Landcruiser HZJ105r (1HZ motor) 250,000 on bio (sold)
    2006 Mazda B2500 (WLT motor) 80,000 on bio (sold)



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