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    STUDIA CHEMIA - Ediţia nr.2 din 2004  
         
  Articol:   MATHEMATICAL MODEL FOR THE DISCONTINOUS SOLID - LIQUID EXTRACTION OF CAROTENOIDS (PART I).

Autori:  BARBU-RADU-HORAÅ¢IU MIÅžCA, IOAN OPREAN, D.I. MANCIULA. 		 
       
         
  Rezumat:  The carotenoids form an important non-nitrogenated group of natural pigments giving the yellow, red or blue colour to the tissues in which they are found. The biochemical role of these pigments exerts a particular influence in the processes of photosynthesis, respiration and germination, in the protection against photodestruction and in oxygen transport to the tissues. Many carotenoids extracts are being used as additive agents in the staining of food and pharmaceutical products. The recovery of these products from the plant material is mainly achieved using solid-liquid extraction technique. In this paper the basic consideration take for development of the mathematical model for solid – liquid extraction are presented: the general design of the technological process, the mass transport equation of the solute, the overall behaviour of the solid layer in the presence of the wetting fluid. It is evaluated the mass balance for the process and the driving forces evolution, the non dimensional similitude groups for non steady-state extraction. The calculus of static retention for the wetting liquid are presented too.  
         
     
         
         
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