Solution film-forming method

Details Solution film-forming method Solution film-forming method

2003-07-17

2008-08-12

Popovics, Robert James (Department: 1797)

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

By casting liquids on a solid supporting or shaping surface

C210S777000, C210S778000, C210S193000

Reexamination Certificate

active

07410605

ABSTRACT:
The solution film-forming method is provided in which the absolute filtration accuracy for a cellulose acylat solution can be improved and filtration throughput can be increased without reducing the pore size of a filtering material. A dope stock solution to be filtrated is first introduced into a body feed tank and a filter aid from a filter aid tank is added and dispersed. As the filter aid, an aid including SiO2 in 50% or more and a cellulose-based aid are mixed for use. The dope stock solution in which the filter aid is dispersed is introduced into a filter machine and subjected to filtration while forming a cake on the surface of the filtering material. After the filtration, a cleaning solvent is supplied in circulation from a cleaning solvent tank, and the cake is discharged as slurry. The filter aid is separated from the slurry by a separating device and burned in a burning device. Then, a regenerated filter aid is sent to the filter aid tank. After the cleaning, a precoat liquid in which the filter aid is dispersed is supplied from a precoat tank to the filter machine to form a precoat layer on the surface of the filtering material.

REFERENCES:
patent: 2004/0023051 (2004-02-01), Nishimura et al.
Handbook of Separation Techniques for Chemical Engineers, 2nd Edition (1988), McGraw Hill, pp. 4-9 through 4-14.

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