Patent ID: 7959133

Claim:
A grid falling film devolatilizer comprising: a tower housing having a round, square or rectangle cross section; a liquid distributor for distributing liquid within said tower housing; and one or more internal towers arranged in said tower housing in a parallel manner, for continuously forming and regenerating a large surface of film material using the liquid supplied by said liquid distributor; wherein each said internal tower consists of pillars and multiple grid trays, and four pillars stand respectively at four corners of said internal tower which has a square or rectangle cross section, and wherein the number of said grid trays is from 2 to 500, and each pair of neighboring grid trays having a layer interval in the range of about 20 to 500 mm; wherein each said grid tray includes a pair of beams, a plurality of grid bars and corresponding guide members; wherein said beams are located at opposite sides of said grid tray, in a horizontal plane of same height, and are fixed to said pillars; wherein said grid bars are fixed perpendicularly to said beams and are arranged in either single tier, double tiers or multiple tiers in a parallel manner; wherein said grid bars have a cross-section of triangle, reverse “V” shape; wherein said guide members include guide mesh and a clamp for fixation of said guide mesh and wherein said guide members are disposed at a grid gap between said two neighboring grid bars and parallel to said grid bars, and said corresponding clamps are fixed to said beams; and wherein the outmost grid bars in each said grid tray are formed as inclines or bent strips which present a larger vertical surface and serve as baffles for keeping liquid level in each said grid tray or the clamps of the outmost guide members in each said grid tray are extended so as to be higher than other said clamps and serve as baffles for keeping the liquid level in each said grid tray.