Why is clay used as adsorbent in vegetable oil purification?
Low cost, local availability and effectiveness are the prevailing factors that have made clay and clay mineral to be used extensively as adsorbent in the purification of vegetable oils. The textural characteristics and surface chemistry play important roles in the bleaching earth performance.
Who invented acid activated bleaching earth?
Taylor and Ungermann patented the procedures for making acid activated bleaching earth using high susceptibility source clay and novel bleaching earth product.
What are bleaching clay base minerals?
Bleaching clay base minerals. Bentonite minerals have limited sorptive properties in the natural state and require chemical treatment by acids to create the surface area and porosity needed for bleaching vegetable oils. Bleaching clays of this nature are commonly referred to as ¡°acid¡± or ¡°acid-activated¡± clays.
What is bleaching earth used for?
Bleaching earth has been used in the refinement of vegetable oils since the end of the 18th century . Even today, bleaching earth or bleaching clay is also known as fuller’s earth, and it has been most extensively used in the bleaching process , .
