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Mecpro’s Zero effluent refining process
Here no neutralization or washing are done.  Even degumming is not done – only conditioning is carried out.  So the water, soap, acidific water resulting from washing is not discharged and so no effluent treatment plant (ETP) is needed.  The gums are removed during the bleaching stage using the twin bleaching technology.  Here in the first stage the bleaching earth is used to remove the colour from the oil.  The spent earth from here is used for conditioning for the fresh crude oil.  The earth absorbs the gums and as its absorption capacity is 20%, thereafter it does not absorb any of the oil.  So there is no oil loss in the spent bleaching earth.  After the second stage the bleaching earth is discarded.
Layer esterification

This is a process for converting free fatty acids (FFA) into triglycerides and some amount of diglycerides.  For this glycerine is added to the oil to the extent of about 4% of the FFA weight.  The FFA as well as 40% of the glycerine added is then converted into oil through esterification.  The FFA that would sell for Rs 26/kg is then converted into oil that would sell for Rs 42/kg, at the cost of some capital equipment and 4% of glycerine at Rs 26/kg.

No catalyst is required in this process.  Any FFA escaping is fed back into the system.  It can be used for biodiesel to improve the profitability of the plant.

 
 
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