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Mass Transfer

Q1: Which of the following adsorbent is used to decolourise yellow glycerine ?

A Silica gel

B Alumina

C Fuller's earth

D Activated carbon

ANS:B - Alumina

Fuller's earth is commonly used to decolorize yellow glycerine. Here's why:

  • Fuller's earth is a type of clay that is rich in minerals like montmorillonite. It has a high adsorption capacity for various impurities, including colorants and pigments.
  • When yellow glycerine is passed through a bed of Fuller's earth, the clay particles adsorb the colored impurities, leaving behind a clearer, colorless glycerine product.
  • This process is commonly employed in the refining of glycerine to remove colorants and improve its purity for various industrial applications.
So, among the options provided, Fuller's earth is the most suitable adsorbent for decolorizing yellow glycerine.



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