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Gilt-Edged Returns With Physical Refining Plants From Mectech    

 

Edible/vegetable oil refining constitutes a sequential step process. Refining involves elimination of phospholipids, pigments, off-flavours, free fatty acids and other impurities in the crude oil. The entire chain undergone in an edible oil refinery plant process usually includes degumming/neutralization, bleaching, deodorization, and winterization and some variations thereof. Physical refining is a method used for the removal of free fatty acids   during the process of distillation, itself a stage of deodorizing. The crude oil needs be extensively degummed to come up with remotely effective results.   With the aid of various permutations and combinations of various equipment and machinery, all kinds of refining methods are achieved and utilized to refine almost all kinds of oil from seeds.  

 

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The physical refining of edible oils the procedure is attractive because of its simplicity, lack of environmental impact, low oil losses, and good-quality products.   Classic processing, also called chemical or wet processing, includes degumming, neutralization, bleaching, and deodorization. Physical refining, also known as dry or steam refining,  is based on the higher volatility of free fatty acids (FFA) compared to triacylglycerols. In physical refining, removal of FFA by chemical neutralization is replaced by simultaneous deacidification/deodorization. In principle, physical refining involves three operations, the first two (degumming and bleaching) being virtually identical. The principal difference concerns the removal of acidity. Physical refining uses steam stripping in a vacuum, a procedure that removes FFA, unsaponifiable substances, and pungent compounds, thus circumventing chemical neutralization with its environmentally objectionable soapstocks. As a consequence, oil losses are reduced, the quality of FFA is increased, and the operation is simplified. It consumes less steam, water, and power and, hence, requires less capital investment. This procedure is also suitable for the processing of oils with higher acidity (palm oil).  

 

 

Physical refining usually involves two steps i.e. 

     

      A) Pre-treatment & Bleaching

 Pre-treatment & Bleaching eliminates minor constituent’s i.e.  Phospodites, heavy metals and other oxidative components before Deacidification/ Deodorization. 

  

MECTECH’s custom-designed Pre-treatment & Bleaching   is cost effective and ensures perfect results. Equipments designed by MECTECH ensure deacidification by distillation of free fatty acids combined with partial or complete deodorization.

    B)Deacitification/ Deodorization 

  

The Deaeration and Pre-heating is achieved gradually and methodically so that the entire oil quantity contacts the sparging system at the free surface in vacuum conditions. An additional top heating tray    in the Deacidifier/Deodorizer compensates the unavoidable oil cooling of about 8'C due to evaporation. The system achieves perfect deodorization by allowing large free surfacing area contact between oil and stripping steam at an absolute pressure of 2 m bar. This results in furnishing oil surface layer of numerous 5-10 mm diameters. Bubbles These small bubbles burst and   discharge   water vapour filled with distilled fatty acids and odorous compounds. Immediately these ascending vapours are extracted freely into lateral ducts through large section opening provided at the top of   stripping tray. This ensures uniform pressure and no drop when top and the bottom tray are compared. Hugely efficient design of the oil - oil heat exchanger at the last tray of Deodorizer minimizes heat energy requirements. Elaborate and efficient design of fatty acid scrabbling recovery system ensures virtually zero carry over of fatty acids into barometric condenser water, thus increasing its efficiency and productivity.