Patent ID: 6034209
Filing Date: 2000-03-07
Classification: B01D,C08F

Abstract:
A process for recovering low-boiling point substances from a foamable polymer latex wherein a foamable polymer latex containing low-boiling point substances and 0.1 to 4.0% by weight of at least one surfactant selected from the group consisting of anionic surfactants and nonionic surfactants is atomized from a nozzle equipped at the upper part of an evaporator to evaporate the low-boiling point substances for recovery, characterized in that, in a first evaporator maintained at a pressure of 50 to 130 torr, the low-boiling point substance-containing polymer latex is atomized over the surface of a polymer latex retained within the first evaporator, and then, in a second evaporator maintained at a pressure of 100 to 240 torr which is higher than that of the first evaporator, the polymer latex retained in the first evaporator is atomized over the surface of a polymer latex retained within the second evaporator; each of the polymer latexes to be atomized in the first and second evaporators is maintained at a temperature of 10 to 30.degree. C. higher than the saturated steam temperature in the respective evaporator.