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611. The steam stripping of taints from liquids: IV. An analysis of continuous counterflow equipment

Published online by Cambridge University Press:  01 June 2009

J. K. Scott
J. K. Scott
Affiliation:
The Dairy Research Institute (N.Z.), Palmerston North, New Zealand
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Extract

The use of a column to give countercurrent contact of steam and cream to strip taints from the cream is explained. An analysis based on the engineering concept of a transfer unit is presented, and generalized curves are given which can be used for any counterflow column using fresh steam. The generalized curves give the percentage reduction in taint for values of the stripping factor (mV/L) when the number of transfer units is known.

It is further shown that the number of transfer units for any particular design of column depends on the value of the stripping factor. The total resistance to the transfer of taint (HTU)L depends on a liquid-side resistance (HTU)l and a steam-side resistance (HTU)g such that (HTU)L=(HTU)l+L/mV(HTU)g.

Results are given for an experimental column in which the liquid flows as (a) a spray, (b) a falling film or wetted wall. A strong deodorizing effect occurs at the bottom of the column and the resistances to transfer are

Resistances for a full-size plant 3 ft. diameter processing at 10,000 lb./hr. are assessed from the above figures as:

Restriction of the process of taint transfer is controlled largely by the liquid-side resistance. Because the minimum obtainable taint level depends on the liquid-side resistance (no matter how much steam is used) a low liquid-side resistance or a tall column must be used for satisfactory deodorization. A minimum of 4 transfer units is suggested, as this will allow a taint to be reduced to nearly 1·8% of the original value.

A design method is given based on hypothetical taint conditions, the generalized curves, and the characteristics of any proposed counterflow column.

Type
Original Articles
Information
Journal of Dairy Research , Volume 23 , Issue 1 , February 1956 , pp. 30 - 47
Copyright
Copyright © Proprietors of Journal of Dairy Research 1956

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References

REFERENCES

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