| Summary: | 碩士 === 國立臺灣大學 === 化學工程研究所 === 81 === The effect of natural oils on oxygen overall mass transfer
coefficient, Ka, in an agitatedand aerated tank was studied.
Lard oil, olive oiland castor oil were investigated. The
results showed that the addition of the oils could cause severe
decrease in Ka compared with that of pure water. However, Ka
became greater than that of pure water when the volume fraction
of oils reached 0.25% at agitation rate of 400rpm. Among the
oils studied, in general,Ka was the least when the more viscous
castor oil was used. In a 2-day yeast cultivation, a comparison
between 1% olive oil and 0.1% polypropylene glycol (ppg, a
commercial antifoam) was made. The results indicated that the
olive oil had K 2 to 4 times of that of the ppg and more cells
wereproduced with olive oil as antifoam.
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