New Alumina PLOT provides Highest Acetylene/Propadiene Response and extended Maximum Temperature

2011-jaap-pasfoto4During last ISCC symposium in San Diego, several posters were presented on alumina PLOT technology and application. One poster was about a new alumina columns with improved characteristics. The other poster was about separation behavior of alumina. Here we zoom into the new Alumina technology.

In light hydrocarbon analysis, the separation and detection of traces of polar hydrocarbons like acetylene, propadiene and methyl acetylene is very important.  Using commercial alumina columns with KCl or Na2SO4 deactivation, often results in low response of polar hydrocarbons. Additionally, challenges are observed in response-in time stability.

Solutions have been proposed to maximize response for components like methyl acetylene and propadiene, using alumina columns that were specially deactivated.  Operating such columns showed still several challenges:  Due to a different deactivation process, the retention and loadability of such alumina columns was also significantly reduced.

New alumina column has high loadability: peak shapes are better because of reduced overload

Alumina BOND / MAPD: Highest response for challenging unsaturated hydrocarbons

A new Alumina deactivation technology was developed that combined the high response for polar hydrocarbon while maintaining the loadability. This allows the alumina column, to be used for a broad application range, varying from trace impurity analysis to hydrocarbon-purity analysis.

The new columns, named Rt-Alumina BOND / MAPD, showed excellent stability of response in time, which was found to be superior then existing solutions. Additionally, it was observed that the new alumina columns could be used up to 250 C, extending the Tmax by another 50ºC. This allows higher hydrocarbon elution, faster stabilization and also widens application scope of any GC where multiple columns are used. Details can be found in this poster handout.Poster 2011-5 Next generation PLOT MAPD alumina technology-handout

Fast analysis of Refinery gases. Here hydrogen was used as carrier cas, but still a 30m column was used.

This new column has a selectivity that is close to the Na2SO4 deactivated alumina columns, meaning it is relatively polar. Separation behavior of alumina is very interesting as the peak sequence of polar hydrocarbons can be easily manipulated using starting temperature and time, program grate and column flow rate. This will be discussed in a next blog.

3 Responses to “New Alumina PLOT provides Highest Acetylene/Propadiene Response and extended Maximum Temperature”

  1. Dear Jaap –

    Nice new Rt-Alumina BOND/MAPD column! Have you any idea where 1,2-Butadiene will elute on the column?

    With kind regards –
    Lars Kürstein, Haldor Topsøe A/S, Copenhagen

  2. jaap says:

    Hi Lars,

    1,2 Butadiene elutes before 1, 3 – Butadiene, just after n pentane. we have also C’grams showing that


  3. Jaap says:

    Hi Lars

    1,2 Butadiene elutes before 1,3 butadiene, after n-C5. We have a C’gram showing that.


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