What is bentonite-based spent bleaching earth/clay (SBE)?
The activated or neutral form of bentonite-based spent bleaching earth/clay (SBE) is a by-product generated during the bleaching process in edible oil refinery. Its untreated form is disposed of directly at landfills involving high cost and land area, and possibly causing environmental problems.
What is the adsorption capacity of activated carbon & bleaching earth?
To obtain a high adsorption capacity in the bleaching of some oils, a mixture of activated carbon and bleaching earth is used in refining industries. In general, the amount of activated carbon must be in the range of 5¨C10g/100g to the amount of bleaching earth. This technique is very well documented in the literature [ 8, 69 ].
What is the role of bleaching earth in palm oil production?
Introduction Bleaching earth plays a crucial role in the manufacture of edible palm oil from crude palm oil (CPO). The bleaching earth (BE) is used as the agent in the bleaching process to remove the colorant compounds contained in CPO, which is mainly ¦Á and ¦Â-carotenes ( Ng and Choo, 2016; Ribeiro et al., 2018 ).
How much bleaching earth is used in palm oil refining?
Globally, based on a 1 mass% bleaching earth usage for some 200 million t of edible oils and fats refined, an estimated 2 million t of SBE equivalent is available yearly ( Loh et al., 2013, Beshara and Cheeseman, 2014 and MPOB, 2016 ). In Malaysia, ~ 10¨C15 kg bleaching earth per t CPO (1¨C1.5 mass%) is used in palm oil refining.
