Stripping, liquid

At the lop of the tower any intermediate components going out with the gas are condensed, separated, pumped back to the tower, and sprayed down on the top tray. This liquid is called reflux. and the two-phase separator that separates it from the gas is called a reflux tank" or reflux drum. The reflux performs the same function as the cold feed in a cold-feed stabilizer. Cold liquids strip out the intermediate components from the gas as the gas rises. 

The engineering analysis and design of these operations addresses questions which are different than those addressed in connection with the shaping operations. This is illustrated in Fig. 1 which is a flow sheet, cited by Nichols and Kheradi (1982), for the continuous conversion of latex in the manufacture of acrylonitrile-butadiene-styrene (ABS). In this process three of the nonshaping operations are shown (1) a chemical reaction (coagulation) (2) a liquid-liquid extraction operation which involves a molten polymer and water and (3) a vapor-liquid stripping operation which involves the removal of a volatile component from the molten polymer. The analysis and design around the devolatilization section, for example, would deal with such questions as how the exit concentration of... 

One more separation technique that deserves some discussion is the scrubber. Scrubbers are the most mature technology from the chemical separation industry that usually employs liquid-gas interaction to achieve the contaminant removal. While they can be very selective due to the liquid-stripping agent, they are complicated systems that use specialty chemicals and require multiple steps to transfer the contaminant from gas phase to liquid, then from liquid back to gas phase, which is ultimately vented. For very large, stationary installations, scrubbers are usually the technology of choice because of their performance they can routinely achieve 99.99% removal efficiency, durability, and robustness. However, scale-down is not... 

T, the terminal stage temperatures. Often (Ts+i T, ) ranges from 0 to 20°F, depending on the fraction of entering liquid stripped. 

An absorber is used to remove selected components from a gas stream by contacting the stream with a gas or liquid. Stripping columns are used with absorption columns to remove liquid hydrocarbons from the absorption oil. An adsorber is a device filled with a porous solid designed to remove gases and liquids from a mixture. A scrubber is used to protect and enhance environmental quality by removing chemicals and solids from process gases. 

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