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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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    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  
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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.
    Without wishing to overstate my case, everything in the observable universe definitely has its origins in Northamptonshire -- Alan Moore
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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.

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