The feasibility of using hollow fiber ultrafi1tration
for clarification, stabilization and preservation of white
grape juice was evaluated. Flux and process parameters of
a hollow fiber membrane ultrafi1tration unit (Romicon pilot
scale, model FXS-MXII), were studied using white Riesling
grape juice. Optimum processing conditions were determined
for different nominal membrane molecular weight cut-off
values. The effect of cut-off value changes on viscosity,
pectin retention, pH, sugar content, titratable acidity,
haze reduction and color were evaluated.
Optimum conditions for processing were nominal membrane
molecular weight cut-off = 50,000, temperature = 50°C,
inlet pressure = 1.75 Kg/cm², outlet pressure = 1.40 Kg/cm²,
permeate flux = 72.57 L/M²-H. Concentration polarization and fouling of the membrane increased with feed juice viscosity
and were limiting factors in permeation rate. A
93% retention of pectins was achieved and haze reduction
was in the range of 91-93%. Sugar content, pH, titratable
acidity, and color were not affected for any of the nominal
membrane molecular weight cut-off values. / Graduation date: 1984
| Identifer | oai:union.ndltd.org:ORGSU/oai:ir.library.oregonstate.edu:1957/27042 |
| Date | 29 August 1983 |
| Creators | Garcia-Quintero, Zeferino Heberto |
| Contributors | Badenhop, Arthur F. |
| Source Sets | Oregon State University |
| Language | en_US |
| Detected Language | English |
| Type | Thesis/Dissertation |
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