The influencing factors for mass transfer of gas-liquid interface in liquid desiccant system are analyzed. A mass transfer correlation is given in dimensionless form based on the driving force of mass transfer

which is the vapor pressure difference through gas-liquid interface. The constants in the correlation are fitted based on published experimental data of LiCl-H2O-air system in a column packed with cross corrugated cellulose. Another group of published experimental data of LiCl-H2O-air system in a column packed with polyvinyl chloride is used for validating the correlation

with the relative deviation between experimental and calculated results from -10.48% to 5.28%. Moreover

a liquid dehumidification system driven by heat pump is set up

with LiBr-H2O as desiccant and finned tube heat exchanger as packings

and the experimental data are used for validating the correlation. The result shows that the deviation is -1.8%-12.8%. All these results show that the correlation has a high accuracy for mass transfer coefficient prediction in liquid dehumidifier with structured packings.