Patent ID: 7265241
Filing Date: 2007-09-04
Classification: B01D,C07C

Abstract:
1. A vertical thin film evaporator, comprising: an evaporator main body having a cylindrical principal portion; a heater provided on an exterior surface of the main body; a liquid inlet provided at an upper portion of the main body; a vapor outlet provided at the upper portion of the main body; a residue discharge port provided at a lower portion of the main body; a rotary shaft set in the main body; stirring vanes attached to the shaft and being movable in a peripheral direction in contact with an inner wall surface of the evaporator main body; and wipers attached to the rotary shaft and movable in a peripheral direction and in contact with the inner wall surface; wherein: the wipers contact the inner wall surface at a location where no heat from the heater is provided; and the wipers contact the inner wall surface at a location between a lower end of the stirring vanes and the residue discharge port.