PROCESS FOR CONCENTRATING AND RECOVERING SURFACTANT AQUEOUS SOLUTION

摘要

A process for concentrating and recovering a surfactant aqueous solution, by evaporating and concentrating a surfactant aqueous solution containing a gasifiable surfactant and an aqueous solvent to increase the concentration of the surfactant, which comprises storing the surfactant aqueous solution in an evaporator 12; adjusting the temperature of the surfactant aqueous solution in the evaporator 12 to be lower than the boiling point of the aqueous solvent under the pressure in the evaporator 12; withdrawing a part of the surfactant aqueous solution from the evaporator 12, superheating it by a superheater 14 under conditions that all the surfactant and the aqueous solvent are formed into an annular flow or an annular mist flow, and spraying it from a nozzle 32 having a shape such that the outlet side first narrows and then widens outward, into the evaporator 12; and evaporating and removing the aqueous solvent.

主权项

1. A process for concentrating and recovering a surfactant aqueous solution, by evaporating and concentrating a surfactant aqueous solution containing a gasifiable surfactant and an aqueous solvent to increase the concentration of the surfactant, which comprises:
storing the surfactant aqueous solution in an evaporator; adjusting the temperature of the surfactant aqueous solution in the evaporator to be lower than the boiling point of the aqueous solvent under the pressure in the evaporator; withdrawing a part of the surfactant aqueous solution from the evaporator, superheating it under conditions that all the surfactant and the aqueous solvent are formed into an annular flow or an annular mist flow, once pressure-condensing the surfactant aqueous solution in a nozzle and spraying it into the evaporator by the nozzle having a shape such that the outlet side first narrows and then widens outward; and evaporating and removing the aqueous solvent.