The bleaching process is carried out to remove color pigments residual phosphates, metals, soaps and oxidation products using Bleaching Earth and activated Carbon as per requirement of the process. The bleaching process is carried out in two stages in a continuous manner. In the first stage, oil is heated at 100 – 110o C and mixed with Bleaching Earth. The oil then is kept at a suitable temperature and mixed with Bleaching Earth with mild agitation by specially designed turbine blades agitator system under vacuum.
Oil is sprayed through specially designed nozzles and mixed with Bleaching Earth and sufficient retention time is given to attain maximum possible bleaching of oil. By spraying oil, moisture is removed from the vessel itself. In the second stage, oil slurry is pumped to a set of vertical pressure leaf filters where two filters are used alternatively to remove oil from Bleaching Earth and cake is discharged through bottom actuated Butterfly Valve. After filtration, oil is circulated through Candle Type Polish Filters to further polish the oil & remove any traces of particles.
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