The study on evaporation processes of brine solution at reducing pressure mainly concentrates on falling film evaporation in the sea-water desalination and flat surface evaporation in industrial processes.In this study

the phase change of droplets was investigated.Various factors influencing the temperature of multicomponent droplet were examined experimentally

with brine solutions of 15% and 6% as working medium

initial environmental pressure of 94.5—97 kPa and final pressure of 50—3000 Pa

initial droplet temperature of 7—30℃

and initial diameter of 1—3 mm.The experimental data show that with the change of central temperature of salt water droplets at reducing pressure

the process can be divided to that with salting and without salting.As the water evaporates

reaching droplet density of 22.4% and temperatures low enough

the salt precipitated

otherwise the salting would not appear.At different concentrations

final pressures

initial temperatures and sizes

the relationship between the temperature change in the phase change of droplet and the environmental pressure was obtained.