Mass Transfer

In the McCabe-Thiele diagram, a vertical feed line indicates that the feed is a saturated vapor, while a horizontal feed line shows the feed is a saturated liquid. These lines represent the thermodynamic state of the feed in the distillation column. The feed condition directly influences the operating lines and equilibrium stages required.

Hot water is commonly used to leach sugar from sugar beets because it dissolves sugar effectively while minimizing impurities.

In small columns, local efficiency is approximately equal to Murphree efficiency due to minimal axial mixing. In large columns, axial mixing reduces local efficiency compared to Murphree efficiency.

When the overall gas transfer coefficient equals the gas film coefficient, it implies that the gas film controls the rate, which occurs when the gas has low solubility in the solvent.

Flash distillation is widely used in petroleum refining to separate light hydrocarbons from crude oil. It operates by vaporizing a portion of the liquid mixture under reduced pressure.

HETP (Height Equivalent to a Theoretical Plate) and HTU (Height of a Transfer Unit) become equal when the operating line is parallel to the equilibrium line. This condition represents a situation where the driving force for mass transfer remains constant.

Rotary drum filters are widely used for continuous filtration operations. They are designed to handle large volumes of slurry with minimal downtime.