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Thread: Hydration and Dehydration catalyst

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    Hydration and Dehydration catalyst

    For the dehydration of ethanol to ethylene is the catalyst used a zeolite catalyst? and for the hydration is it also a zeolite catalyst just diluted?

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    617 pages fan96's Avatar
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    Re: Hydration and Dehydration catalyst

    Sulfuric acid is used in both cases.

    Concentrated sulfuric acid is a dehydrating catalyst, and dilute sulfuric acid is a hydrating catalyst.
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    1(3√3) t2 dt cos(3π/9) = log(3√e) | Integral t2 dt, From 1 to the cube root of 3. Times the cosine, of three pi over nine, Equals log of the cube root of e.

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    Re: Hydration and Dehydration catalyst

    Yeah as fan96 said, the catalyst used is sulfuric acid for both the hydration of ethylene and the dehydration of ethanol.

    Dehydrating ethanol to ethylene requires concentrated sulfuric acid as a catalyst.

    Hydrating ethylene to ethanol requires dilute sulfuric acid as a catalyst.

    A nice way to remember which catalyst is used is by thinking:
    - Hydration implies adding water therefore dilute sulfuric acid is used (dilute sulfuric acid has lots of water compared to concentrated sulfuric acid)
    - Dehydration implies 'removing' water therefore concentrated sulfuric acid is used (since there isn't much water in concentrated acid)
    It's not really a 'chemistry' way to think about it though but it works lol.
    Last edited by captainhelium; 15 Feb 2018 at 10:19 PM.
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    Re: Hydration and Dehydration catalyst

    Quote Originally Posted by captainhelium View Post
    Yeah as fan96 said, the catalyst used is sulfuric acid for both the hydration of ethylene and the dehydration of ethanol.

    Dehydrating ethanol to ethylene requires concentrated sulfuric acid as a catalyst.

    Hydrating ethylene to ethanol requires dilute sulfuric acid as a catalyst.

    A nice way to remember which catalyst is used is by thinking:
    - Hydration implies adding water therefore dilute sulfuric acid is used (dilute sulfuric acid has lots of water compared to concentrated sulfuric acid)
    - Dehydration implies 'removing' water therefore concentrated sulfuric acid is used (since there isn't much water in concentrated acid)
    Additionally, a more chemistry way to remember is that more energy is required to break the -OH bond with the CH3CH2- chain in Ethanol, but breaking the relatively unstable double-bond in ethylene is much easier
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