Gas Absorption Simulation of Ammonia-Air-Water System in a Packed Column

Author : Pacia, Carlos Lagasca
Major Adviser : Alcanzare, Edilberto A.
Committee Members : Movillon, Jovita A.; Acda, Reynaldo I.
Year : 1995
Month : April
Type : Thesis
Degree: BS
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A model for the gas absorption kinetics for ammonia-water system was developed and encoded into a program under the filename AMTS.PAS (Ammonia Mass Transfer Simulation) written in Turbo Pascal.

Verification of the program was done by gathering test data through experiment done on an existing packed column operated with counterflow of rich gas and the weak liquor at the chemical Engineering Unit Operations Laboratory. The model encoded in Pascal language was tested and verified to be valid in simulating the behavior of ammonia-water mass transfer kinetics of the liquid and gas phases with an average deviation of 2.45 % for the liquid and a 6.33 % deviation for the gas phase. The over-all mass transfer coefficients estimated form the preliminary investigation in kg-mol per minute-cubic meter were 0.62 and 0.09 for the liquid and gas phase, respectively.

The program’s design capabilities was also tested and values obtained were compared to an existing packed column in the Chemical Engineering Unit Operations Laboratory. The design results showed validity in the program’s designing ability which calculated the packing height equal to 0.72 meters compared to 0.1397 meters of actual diameter. The Number of Transfer Units was calculated to be equal to 10.015 and Height per Transfer Unit equal to 0.043 meter. A 13.8 % over-design allowance was observed.

Recommendations were suggested to increase the level of accuracy of the model, improve the operational capability of the existing packed column, and upgrade and expand the scope of the software.

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