A cup-jet absorber is one of the high velocity co-current equipment of mass transfer. Research on this equipment in related literatures was only restricted to the operation conditions below the liquid-gas ratio m = 8 1/m3

while works on the liquid-gas ratio m=101/m3 have not been found yet in the periodicals. The present paper is dealing with the study of the foll wing two subjects:(1) Observation of the flow patterns in a cup-jet absorber;(2)Approach to the correlated method of the pressure drop and the mass transfer data of the cup-jet absorber under the high liquid-gas ratio. The experiments were undertaken on air-ammonia-water system under the conditions of liquid-gas ratio m= 4to30 l/m3 and gas velocity WG=10to50m/s at the bootom of the cup. We arrived at the following conclusions: (1) The operation regions of a cup-jet absorber were divided into three differant flow patterns. The first state is known as a pulsation state

the second as a homogeneous and continuous state

and the third as an extreme turblent state. ( 2 ) We have presented the following empirical equations for a cup-jet absorber. In a dry column

if Re≤3.1×104

the pressure drop data for a cup-jet absorber are correlated La=8.95×10-1Re0.95 and if Re>3.14×104

La=1.168×10-1Re where La is the Lagranian number

and Re is the Reynolds number. In a wetted-cup column with the dimensionless group 0.06 and when

the flow state is of the second pattern

when

that is the third state

where the gas velocity at the bottom of the cup

m/s; the gas density

kg/m3; the gas viscosity

kg.s/m2; d0 -the diameter at the bottom of the cup

m. Besides

we have also found that the mass transfer data can be correlated by the following empirical equation; where

the overall gas mass transfer coefficient for a cup-jet in kg- mols/h.m3(unit molar concentration difference); NOG-the number of overall gas transfer units for a cup-jet.