HomeFAQBleaching earth has been the best known method for bleaching the colour of palm oil. Are there any new developments in the bleaching of oils?
Bleaching earth has been the best known method for bleaching the colour of palm oil. Are there any new developments in the bleaching of oils?
FAQ / Chat on line / Give me a price / Date: November 19, 2014
The use of activated bleaching earth (clay) in the processing of oils and fats has a long and successful history.
Bleaching earths have gradually and steadily improved in quality so that with reasonably good crude palm oil, addition of about 1% enables the desired final colour limit of 3 RED (5.25 inch Lovibond cell) to be reached every time.But the performance of a bleaching earth cannot be assessed on colour considerations alone because the removal of phosphatides and trace metals is also very important in ensuring maximum stability to oxidation and resistance to flavour deterioration.
Now new materials are challenging the position of bleaching earth e.g. the development of silica hydrogel which, when used to replace part of the bleaching earth, lead to equally good colour values in the finished oil, and also much better removal of phosphatides.
Thus, 0.3% hydrogel plus 0.6% bleaching earth gives better removal of trace metals and gums than 1.3% bleaching earth alone.
Bleaching earths have gradually and steadily improved in quality so that with reasonably good crude palm oil, addition of about 1% enables the desired final colour limit of 3 RED (5.25 inch Lovibond cell) to be reached every time.But the performance of a bleaching earth cannot be assessed on colour considerations alone because the removal of phosphatides and trace metals is also very important in ensuring maximum stability to oxidation and resistance to flavour deterioration.
Now new materials are challenging the position of bleaching earth e.g. the development of silica hydrogel which, when used to replace part of the bleaching earth, lead to equally good colour values in the finished oil, and also much better removal of phosphatides.
Thus, 0.3% hydrogel plus 0.6% bleaching earth gives better removal of trace metals and gums than 1.3% bleaching earth alone.
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- QDo you want to buy machine?
- Yes, I want to buy machine.
- No, I want to learn more in advance.
- QWhat oil seeds do you want to process?
- Palm fruit
- Palm kernel/nut
- Peanut/Groundnut
- Soybean/Soya bean
- Sunflower seed
- Cottonseed
- Rapeseed/Canola
- Dried coconut
- Rice bran
- Corn germ
- More than two oilseeds:
- Other:
- QHow many tons palm fruit bunches will you process per day?
- 1-10 tons per day
- 10-30 tons per day
- 30-50 tons per day
- 50-100 tons per day
- QWhat machine do you want?
- Palm oil presser
- Other single machine (thresher, clarification tank, vibrating screen, filter...)
- Palm oil pressing line (from FFB to crude oil)
- Palm oil refining line (to produce refined, bleached, deodorized oil)
- Palm oil bottling / filling line
- QWhat machine do you want?
- Palm oil pressing line (from FFB to crude oil)
- Palm oil refining line (to produce refined, bleached, deodorized oil)
- Palm oil bottling / filling line
- QHow many tons oil seeds will you process per day?
- 1-20 tons per day
- 20-50 tons per day
- 50-100 tons per day
- QWhat machine do you want?
- Oil presser
- Other single machine (cracker, crusher, roaster, filter...)
- Oil pressing line (from seeds to crude oil)
- Oil refining line (to produce refined, bleached, deodorized oil)
- Oil bottling / filling line
- QWhat machine do you want?
- Oil presser
- Oil pressing line (from seeds to crude oil)
- Oil solvent extraction line
- Oil refining line (to produce refined, bleached, deodorized oil)
- Oil bottling / filling line
- QWhat machine do you want?
- Oil pressing line (from seeds to crude oil)
- Oil solvent extraction line
- Oil refining line (to produce refined, bleached, deodorized oil)
- Oil bottling / filling line
