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Thread: caustic soda

  1. #11
    Join Date
    Oct 2005
    Location
    Sunshine Coast, QLD
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    708

    Re: caustic soda

    Also Ethanol makes Ethyl Esters, Methenol makes Methyl esters. Both are called biodiesel.

  2. #12
    Join Date
    Nov 2005
    Location
    Tasmania
    Posts
    494

    Re: caustic soda

    Thanks, I'll stick to the methanol until I understand the chemical theory before using ethanol. I'm amazed at the total lack of interest government has in BD in Tas, they just look at you dumbfounded and say, "its not relevant to our economic aims".

    That sums it up very well I believe, braindead and locked into monopoly single point processing and distrubution so they can control energy.

  3. #13
    Join Date
    Aug 2008
    Location
    belize central america
    Posts
    4

    Re: caustic soda

    Hello ,All, I have successfully made a litr of washed bio diesel. using soybean cooking oil -fresh- with sodium hydroxide and methanol. later 2months-i tried again but when i mixed the methanol and lye it turned brown to reddish while the first batch was clear to slightly opaque. Can some one tell me if this is normal or what the problem is Thanks

  4. #14
    Join Date
    Dec 2006
    Location
    ANDURAMBA 4355 QUEENSLAND
    Posts
    40

    Re: caustic soda

    Hi Geewizztoo,
    Do you know if soduim or calcium zeolite will remove water from glycerine?
    R
    charris

  5. #15
    Join Date
    Sep 2005
    Location
    South West Sydney
    Posts
    414

    Re: caustic soda

    Hi Charris,
    The short answer is no I don't know. There are many different grades of Zeolite, why don't you give one of the suppliers a call and they might send you a sample or two. I can't think of a reason why it shouldn't work. It absorbs water from ethanol and glycerol is a type of alcohol.

    Quell my curiosity, why do you want to remove water from glycerine?

  6. #16
    Join Date
    May 2008
    Location
    Melbourne, VIC
    Posts
    20

    Re: caustic soda

    mr fuel pincher,
    there is something wrong with either your NaOH or Methanol is should go a milky white colour when mixed... def not reddish!
    cheers

  7. #17
    Join Date
    Dec 2006
    Location
    ANDURAMBA 4355 QUEENSLAND
    Posts
    40

    Re: caustic soda

    Quote Originally Posted by geewizztoo View Post
    Hi Charris,
    The short answer is no I don't know. There are many different grades of Zeolite, why don't you give one of the suppliers a call and they might send you a sample or two. I can't think of a reason why it shouldn't work. It absorbs water from ethanol and glycerol is a type of alcohol.

    Quell my curiosity, why do you want to remove water from glycerine?
    Well Mate,

    Been thinking about making industrial hand cleaner and infusing it with orange oil.

    I have been doing a few experiments to acidulate glycerine and thereby remove the fatty acids. The result as you know is glycerine+water+methanol. Fatty acids float to the top and the acid salt settles out on the bottom.

    Methanol recovery should present no real problem. That leaves water, aromatics and colourants.

    I think there are membrane filters that will remove aromatics and colourants. I'm looking into that. Perhaps a bed of activated charcoal might do it too, maybe.

    That leaves the water. I asked Oily about his idea of using casting powder. It seems to work pretty well in removing water and soap from biodiesel. Maybe it might work with glycerine too. Dunno. He's not sure either.

    Then I read about zeolites on this site. I have used soduim zeolite to remove the calcuim ion from hard water and replace it with a soduim ion but I did not know of the zeolite ability to remove water from alcohols.

    That's it in a nut shell

    Regards

    charris

  8. #18
    Join Date
    Sep 2005
    Location
    South West Sydney
    Posts
    414

    Re: caustic soda

    As you may know, ethanol forms an azeotrope with water (about 4% water) that's why it's very difficult to get completely dry ethanol. Zeolite is used as molecular sieve to dry it.

    If you're going to remove the methanol from the glycerine by distillation why not keep going and take the water out as well?

    It all sounds very interesting, why not start a separte thread as this discussion is in the wrong place?

  9. #19
    Join Date
    Nov 2011
    Location
    Koh Samui Thailand
    Posts
    1

    Re: caustic soda

    Sorry but do you know what factors with using NaOH causes it to go solid and are there ways to prevent this, Also can you still reclaim the methanol from solid glycerol, Im having trouble sourcing KOH in Thailand. Any advice??

  10. #20
    Join Date
    Sep 2005
    Location
    WA
    Posts
    4,075

    Re: caustic soda

    Colze15,

    Welcome to the forum. How long have you been making biodiesel?

    The byproduct should remain liquid whilst it is warm (>40C I expect). The methanol is normally recovered at temperatures above this.
    Once the byproduct cools down, it will solidify, so you must either ensure that the byproduct is out of your methanol recovery vessel before then, or keep it liquid by other means.

    After the methanol has been removed, water could be added to the byproduct to keep it liquid. You would need to experiment with small batches to determine the solidification temperature of your byproduct and the proportion of water you would need to add to it to keep it as a liquid.

    Regards,
    Tony
    Life is a journey, with problems to solve, lessons to learn, but most of all, experiences to enjoy.

    Current Vehicles in stable:
    '85 Mercedes Benz W123 300CD Turbodiesel single tank using 95% used cooking oil and 5% to 10% misfuel (where someone had filled diesel vehicle with petrol).
    '06 Musso Sports Crew Cab. Running on used cooking oil with 5% to 10% misfuel.
    Toyota Camry Hybrid - (Wife's Car)

    Previous Vehicles:
    '90 Mazda Capella. (2000 - 2003) My first Fatmobile. Converted to fun on veggie oil with a 2 tank setup. Died when supercharger stuck at max boost for weeks. Stretched head bolts.
    '80 Mercedes 300D. 2 tank conversion [Sold]
    '84 Mercedes 300D. 1 tank, no conversion. Replaced engine with rebuilt OM617A turbodiesel engine. Finally had good power. Donor for current Fatmobile coupe. (body parted out and carcass sold for scrap.)
    '99 Mercedes W202 C250 Turbodiesel (my darling Wife's car)[sold]
    '98 Mercedes W202 C250 Turbodiesel (my car)[sold]



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