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Saturday, October 22, 2011

Chemistry Form 5: Chapter 2 - Hydrogenation


Hydrogenation process is addition reaction to convert alkene becomes alkane. It converts unsaturated compound to saturated compound.

Ethene reacts with H2 at 180 °C in the presence of nickel or platinum catalyst to produce ethane

Click on the diagram below to play!


Application of hydrogenation: Making Margarine

Vegetable oils often contain high proportions of polyunsaturated and mono-unsaturated fats (oils), and as a result are liquids at room temperature. That makes them messy to spread on your bread or toast, and inconvenient for some baking purposes.

You can "harden" (raise the melting point of) the oil by hydrogenating it in the presence of a nickel catalyst. Conditions (like the precise temperature, or the length of time the hydrogen is passed through the oil) are carefully controlled so that some, but not necessarily all, of the carbon-carbon double bonds are hydrogenated. This produces a "partially hydrogenated oil" or "partially hydrogenated fat".



4 comments:

  1. Tan KitNovember 2, 2011 at 5:00 PM

    haha once i see the animation I could remember liao
    Nickel 180'c + H2 + alkene > alkane

    ReplyDelete
  2. UnknownNovember 2, 2011 at 11:10 PM

    Hi Tan Kit, I hope you are already fully prepared for your SPM. Thanks to be my student. May God bless you.

    ReplyDelete
  3. IxoraMarch 16, 2012 at 1:30 PM

    I can easily understand after looking through all the notes and animations in this blog, thanks for sharing :)

    ReplyDelete
  4. UnknownApril 15, 2012 at 8:22 PM

    it gives me more understanding than my teachers in school. thank you :)

    ReplyDelete