Filtration of cellulose ester dope

Details Filtration of cellulose ester dope Filtration of cellulose ester dope

1990-10-01

1991-10-08

Dawson, Robert A.

Liquid purification or separation

Processes

Separating

210194, 2101951, 21033301, 210335, 210340, 210457, 210793, 210806, B01D 6100

Patent

active

050552074

ABSTRACT:
Disclosed are method and apparatus for filtering particles and gels from cellulose ester dope by passing the dope in plug flow through a tubular filter so as to cause particles and gels to migrate towards the center of the stream and shear forces along the filter walls to reduce the viscosity so that the boundary layer will exude through the filter walls. The concentrate containing the particles and gels is thereby separated from the filtrate.

REFERENCES:
patent: 4218314 (1980-08-01), Schubert et al.
patent: 4313830 (1982-02-01), Tulin et al.
F. Gauthier, H. L. Goldsmith and S. G. Mason, "Particle Motions in Non-Newtonian Media. II. Poiseuille Flow", Transactions of the Society of Rheology 15:2, pp. 297-330 (1971).
G. Segre and A. Silberberg, "Radial Particle Displacements in Poiseuille Flow of Suspensions", Nature, p. 209, Jan. 21, 1961.
C. E. Chaffey, H. Brenner and S. G. Mason, "Particle Motions in Sheared Suspensions", XVIII: Wall Migration (Theoretical) Rheologica Act, Band 4, Heft 1, p. 64 (1965).
B. Shizgal. H. L. Goldsmith and S. G. Mason, "The Flow of Suspensions Through Tubes, IV: Oscillatory Flow of Rigid Spheres", The Canadian Journal of Chemical Engineering, p. 97, Jun., 1965.
F. W. Altena and G. Belfort, "Lateral Migration of Spherical Particles in Porous Flow Channels: Application to Membrane Filtration", Chemical Engineering Science, vol. 39, No. 2, pp. 343-355, 1984.
"Axial Migration of Particles in Poiseuille Flow", Nature, p. 1095, Jun. 17, 1961.

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