DRYING OF WATER GELS: DETERMINATION OF THE CHARACTERISTIC CURVE OF AGAR-AGAR

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Abstract
Agar-agar is a polysaccharide extracted as a hydrocolloid from red seaweed, whose gels are homogeneous, stable and transparent. The characterization of ternary equilibrium and mass transfer kinetics in the agar-water-air system is essential for designing operations in the extractive process as well as for ascertaining the behaviour of these gels and sols during evaporation. humectation and swelling. In this work, the convective thermal drying of agar gels using a laboratory scale discontinuous drier has been studied, the raw data being interfaced to an ancillary microprocessor and generalized according to the characteristic curve formalism useful in the design of full scale driers.

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