Graduate Thesis Or Dissertation
 

Absorption of ammonia in water using a multiple stage crosscurrent packed column

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  • A multiple stage crosscurrent packed column suitable for gas-liquid mass transfer was constructed and operated. The absorption column consisted of a rectangular box constructed of plexiglass and metal. Deflection baffles were positioned at regular intervals on opposite sides of a central packed section to divert the gas phase into the packing affecting a crisscross gas-liquid flow pattern. The column was used for absorbing ammonia from air in an ammonia-air-water system. Pressure drop data were collected for three crosscurrent arrangements and for the conventional countercurrent arrangement. The results indicate that crosscurrent operation with α = 1 (α is a baffle spacing variable) has a higher pressure drop per meter of packed height than the countercurrent operation. When α is decreased to 2 and 3 the crosscurrent column has better pressure drop characteristics than the countercurrent column. The overall mass transfer efficienty was studied experimentally for the three crosscurrent arrangements and for the countercurrent arrangement. Crosscurrent operation with α = 1 is more efficient at removing ammonia than countercurrent operation for the system and ranges of flow rates studies. At a liquid to gas molar ration of two (L/G = 2.0) the α = 2 crosscurrent arrangement was also more efficient than countercurrent but this advantage is lost at lower L/G ratios. Overall, the multiple stage crosscurrent packed column is comparable to and at some conditions more efficient than the conventional countercurrent packed column. It is therefore a viable alternative mass transfer device.
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  • File scanned at 300 ppi (Monochrome) using ScandAll PRO 1.8.1 on a Fi-6670 in PDF format. CVista PdfCompressor 4.0 was used for pdf compression and textual OCR.
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file details ZuehlsdorffDuWayneA1979.pdf 2017-08-07 公开 下载