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Thread: Get sodium hydroxide from sodium-metabisulphite

  1. #1 Get sodium hydroxide from sodium-metabisulphite 
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    Hello everyone. Ok, so, I`ve been thinking if it`s possible to make NaOH from Na2S2O5. Why don`t they do that on larger scales? I mean Na2S2O5 is not expensive, and theoretically, if I calculated right, 42 % of Na2S2O5 gets converted into hydroxide. Could I do this in the lab? I guess the decompostion temp. shouldn`t be above 200 celsius...
    Na2S2O5 ---> Na2O + 2SO2
    Na2O + H2O --> 2NaOH

    Thanks


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  3. #2  
    Forum Bachelors Degree dmwyant's Avatar
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    Why do you need sodium hydroxide in the first place.


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  4. #3 reply 2 
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    I don`t need it, we have plenty of NaOH in school. Besides, if I needed it, I would buy it. Don`t worry, I`m not gonna do this at home or anything, I just wanna know if it`s possible. I think it would be cheaper to make it like this(if everything works) in industry.

    I want to know if this could be done. I`m worried about Na2O reacting with CO2 and H2O from air. But maybe this could be done in a vacuum, constantly removing SO2. I`m gonna consult with my professor. If you have any ideas, please let me know.
    This is a good way for making lye from left-over potassium pyrosulfite from wine industry.
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  5. #4  
    Forum Bachelors Degree dmwyant's Avatar
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    A vacuum chamber sounds feasible to me. I agree that talking to your professor is the best idea.
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  6. #5  
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    You can use helium if you get it from the right channels.
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  7. #6  
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    Why NaOH is cheap already-60 million tons produced annualy
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  8. #7  
    Brassica oleracea Strange's Avatar
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    Quote Originally Posted by fizzlooney View Post
    Why NaOH is cheap already-60 million tons produced annualy
    In fact, I assume it is used as the starting point for the manufacture of things like sodium metabisulphite.
    ei incumbit probatio qui dicit, non qui negat
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  9. #8  
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    I know. I just wanted to know if this is possible. And if you didn`t know Na2S2O5 from wine industry gets thrown away in my country, but as you can see it can be reused to make Na2S2O5 again.
    Oh and I`ve talked to my professor, and we are gonna try to do this, she thinks it`s a great idea. Cheaper isn`t always better, sometimes things HAVE TO be recycled.

    Thanks for your help!
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  10. #9  
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    Tried this, worked like a charm.
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  11. #10  
    Forum Bachelors Degree dmwyant's Avatar
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    Congrats
    Not all who wander are lost... Some of us just misplaced our destination.

    I would rather be a superb meteor, every atom of me in magnificent glow, than a sleepy and permanent planet. The proper function of a man is to live, not to exist.
    -Jack London
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