To make it possible to continuously and stably withdraw highly viscous fluid by providing the upper part of a withdrawing machine with a pushing mechanism to push the highly viscous fluid at the time of withdrawing the highly viscous fluid having a viscosity of a specific value or above under vacuum from a vacuum evaporator.
The highly viscous fluid to be withdrawn is fluid which contains a surfactant and is of ≥1000 P in the viscosity measured by a rotary viscometer. The vacuum evaporator is successively provided with the pushing mechanism which is reduced in the diameter of the inside wall of a casing 43 to a tapered shape and internally disposed with single helical type vanes 41. These single helical type vanes 41 are reduced in the diameter of the vanes as the diameter of the casing 43 is reduced to the tapered shape. The driving force for pushing downward is acted on the highly viscous fluid and the highly viscous fluid is sent to a withdrawing machine by rotating the single helical type vanes 41. A uniaxial eccentric screw pump 51 is used for this withdrawing machine which is provided with a rotor 57 so as to exist along a stator having a curved inside wall surface.
WATABIKI EMIKO
INOTSUKA TAKASHI
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