Optimization of a spray drying process for refined carrageenan
2006
Miranda, L.N. | Elepaño, A.R. | Montaño, M.N.E.
The study was conducted to determine the technical feasibility of spray drying carrageenan. The effect of inlet air temperature (150-200 deg C), pump speed (10-16 rpm x 10 sup 3) and feed temperature (45-85 deg C) on the six responses (powder final moisture content, particle size, gel strength, viscosity, recovery, and drying rate) were investigated using the Response Surface Methodology. Analysis of Variance (ANOVA) showed that particle size was significantly affected by the three factors. Pump speed was the most important factor affecting drying rate, final moisture content and recovery. The effect of inlet air temperature on gel strength and viscosity was statistically significant at 5% and 10% levels respectively. Feed temperature had the least influence among the response variables except for the particle size. The optimum conditions based on the superimposition of the contour plots were: 167 deg C inlet air temperature, 14 x 10 sup3 rpm pumps speed and 56 deg C feed temperature. Experimentally determined values of the response variables ot these optimum conditions were 9.27% moisture content, 1.56 kg/hr drying rate, 57.5% recovery, 7.33 micro m particle size, 17 cps viscosity and 113.04 g/sq cm gel strength. Spray dried carrageenan has lower viscosity but has relatively higher gel strength compared to the powder produced by alcohol precipitation. A difference of about 28% in powder recovery was observed between the two methods of carrageenan production.
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