Concentrating evaporators – Processes – Film
Reexamination Certificate
2005-03-01
2005-03-01
Bhat, N. (Department: 1764)
Concentrating evaporators
Processes
Film
C159S006200, C159S009100, C203S089000, C202S236000, C202S238000, C528S217000
Reexamination Certificate
active
06860966
ABSTRACT:
A method of removing substantially all solvent from a solution containing a polyphenylene ether polymer resin with little by-product formation (less than 250 ppm) is provided. The method employs a wiped thin film evaporator with a cylindrical heating chamber operating under conditions that satisfy the relationships defined by Equations I and II.in-line-formulae description="In-line Formulae" end="lead"?5.3*1024RLδ exp(−24123/T)/m<C Iin-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?100−(4960AP/Tm)<C II;in-line-formulae description="In-line Formulae" end="tail"?Yields are maximized wherein values for feed rate (m) and percent solids (C) are selected to provide a maximum value for the output, Q, determined from the equation m*C=Q and the melt viscosity of the polyphenylene ether product is less than 50,000 centipoise at the operating temperature of the cylindrical heating chamber.
REFERENCES:
patent: 3257357 (1966-06-01), Stamatoff
patent: 3257358 (1966-06-01), Stamatoff
patent: 3306874 (1967-02-01), Hay
patent: 3306875 (1967-02-01), Hay
patent: 3914266 (1975-10-01), Hay
patent: 4028341 (1977-06-01), Hay
patent: 4065346 (1977-12-01), Evkin et al.
patent: 4692482 (1987-09-01), Lohrengel
patent: 4806297 (1989-02-01), Brown et al.
patent: 4806602 (1989-02-01), White et al.
patent: 4935472 (1990-06-01), Brown et al.
patent: 5084134 (1992-01-01), Mattiussi et al.
patent: 5256250 (1993-10-01), Pelzer
patent: 5419810 (1995-05-01), Van Der Piepen et al.
patent: 5573635 (1996-11-01), Van Der Piepen
patent: 5837096 (1998-11-01), Fagerlind et al.
patent: 6429277 (2002-08-01), Braat et al.
patent: 6576700 (2003-06-01), Patel
patent: 1063761 (1979-09-01), None
patent: 0328902 (1989-08-01), None
International Search Report; International Application No. PCT/US 02/33240; International Filing dated: Oct. 15, 2002; Date of Mailing: Mar. 29, 2004 (6 pages).
Polymer Devolatilization, Ed. Ramon J. Albalak, Marcel Dekker Inc. p231 (1996).
Plastics Engineering “An Overview of Devolatilizers” by Pradip S. Mehta Hoechst Celanese Corp., Bishop TX, pp. 190 to 258.
Parrillo David
Singh Probjot
Bhat N.
General Electric
LandOfFree
Method for isolating polyphenylene ether polymer resins from... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method for isolating polyphenylene ether polymer resins from..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for isolating polyphenylene ether polymer resins from... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3367524