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"Plate gap of 0.3 in assumed. 'Two stages. Three stages.

"Plate gap of 0.3 in assumed. 'Two stages. Three stages.

While there are no experimental data available to verify these numbers, experience with falling film plate and tubular evaporators shows that the values are reasonable. It has been noted that equation 2 predicts film thicknesses that are too high as the product viscosity rises so, in actuality, four-effect falling film residence times probably are somewhat shorter than charted.

Summary

Film evaporators offer the dual advantages of low residence time and low temperature difference that help assure a high product quality when concentrating heat-sensitive products. In comparing the different types of film evaporators that are available, falling film designs provide the lowest possible AT and the falling film plate evaporator provides the shortest residence time.

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