摘要
Hydrophobic membrane can provide fast mass transfer for absorption-desorption of gasesform liquid to absorbent.The removal of ammonia from ammonia water and absorption with dilutesulphuric acid was studied in a pilot plant with polypropylene hollow fiber column,The removalrate and influences of operation temperature,flow rate and concentration on mass transferperformances were discussed mathematically.Experimental results and computer calculation show thatthe ammonia removal rate is not affected by the feed concentration for a given system.Both partialand overall mass transfer coefficients vary along the axis of the fiber,and the mass transfer for themembrane process is controlled by membrane resistance.
Hydrophobic membrane can provide fast mass transfer for absorption-desorption of gases from liquid to absorbent. The removal of ammonia from ammonia water and absorption with dilute sulphuric acid was studied in a pilot plant with polypropylene hollow fiber column. The removal rate and influences of operation temperature, flow rate and concentration on mass transfer performances were discussed mathematically. Experimental results and computer calculation show that the ammonia removal rate is not affected by the feed concentration for a given system. Both partial and overall mass transfer coefficients vary along the axis of the fiber, and the mass transfer for the membrane process is controlled by membrane resistance.
