Pipe contactor

Fig. 4. Sectional view of one stage of a new type of gas-liquid contactor without pressure drop. (1) Vaned-disk impeller (2) stator (3) contacting tank (4) impeller shaft (5) gas inlet pipe (gas is self-induced through this pipe into the dispersion) (6) gas outlet thermometer (7) thermometer pocket (8) drainage tank (9) lid [after Gal-Or (G4)].

A short cocurrent horizontal pipeline contactor gives 86 percent removal of NH3. There is no bypassing because of the highly turbulent gas flow and injection of liquid into the center of the pipe. What would we expect the exit gas temperature to be ... 

While the limiting phenomenon of upper limit flooding in a vertical pipe is similar to ultimate capacity in distillation, there is a distinct difference. Upper limit in a vertical pipe applies to a design where a conscious effort should be made to minimize gas-liquid contact. Carried to extremes, it would involve separate tubes for liquid flowing down and vapor going up. In contrast, ultimate capacity in a distillation column corresponds to the condition where effective mass transfer disappears due to high entrainment. One could force more vapor up through the contactor, but fractionation would be poor. 

The pressure drops between Points A and C, between Points A and C, between Points A and B, and between Points A and B , denoted by -ApAC, -ApA C, -ApAB, and -A/Evb, respectively, are measured with inclined U-shape tubes filled with colored kerosene. The average of -ApAB and -ApA B- is taken as the pressure drop through the accelerating pipes, while that of -Ap v and -ApA c as the overall pressure drop across the impinging stream contactor, -ApT. Consequently, there should be... 

Mass-Transfer Correlations Because of the tremendous im-ortance of mass transfer in chemical engineering, a veiy large num-er of studies have determined mass-transfer coefficients both empirically and theoretically. Some of these studies are summarized in Tables 5-17 to 5-24. Each table is for a specific geometry or type of contactor, starting with flat plates, which have the simplest geometry (Table 5-17) then wetted wall columns (Table 5-18) flow in pipes and ducts (Table 5-19) submerged objects (Table 5-20) drops and... 

The enhancement in the bed-wall heat transfer coefficients in bubble columns as well as the two- and three-phase contactors as compared to the single phase pipe flow is likely because of the strong circulation flow pattern in the continuous phase. 

Alves, G. E. (1954) Cocurrent Liquid-Gas Flow in a Pipe-Line Contactor, Chemical Engineering Progress, Vol. 50(9), pp. 449-456. 

Patents on new module designs have been recently presented. Nitto Denko (Japan) patented a spiral wound design for membrane contactor applications [51]. The system includes a central feed pipe around which one or more membranes are wound. Tests on water ozonation demonstrated that it is possible to achieve a concentrahon of ozone 10% higher than in hollow hber. 

Unit configuration Column specifications Type of solvent Solvent flow rate Wastewater flow rate Spray column contactor and stripping column 0.0254 m diameter x 0.914 m glass pipe Isobutylene 0.014 m /h 0.003 m3/h... 

Contactors generally have packers to fit all pipe sizes between the 6-and 24-in. sizes. Special equipment has been built for 4-in. pipe as well as for large pipe. In pipe over 30 in. in diameter, however, people can work inside the pipe, and video equipment and packers are not needed. 

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