Continuous process for making fibrous cellulose acetate filter m

Details Continuous process for making fibrous cellulose acetate filter m Continuous process for making fibrous cellulose acetate filter m

1973-10-23

1976-06-01

White, Robert F.

Plastic and nonmetallic article shaping or treating: processes

With severing, removing material from preform mechanically,...

To form particulate product

264 11, 264200, D01D 526, D01F 228

Patent

active

039610071

ABSTRACT:
Fibrous cellulose acetate resembling asbestos in fibrous structure and liquid filtering properties which is useful for filtering potable liquids such as fruit juices, vegetable juices and wine is made continuously by introducing a stream of a 2-4% by weight solution of cellulose acetate of 25-45 secs. viscosity in acetone and a stream of water into a mixing T at velocities which create substantial turbulence and at a water:solution volume ratio of 4:1 to 20:1, continuously withdrawing the resulting cellulose acetate slurry from the mixing T and passing it through a mechanical shearer which shears the precipitate to a surface area in the range of 35.55 m.sup.2 /g and thereafter depositing the slurry on a porous support to drain unabsorbed water/acetone from the precipitate and washing the precipitate with water until it is substantially acetone-free.

REFERENCES:
patent: 2145076 (1939-01-01), Ehrenstein
patent: 2622273 (1952-12-01), Detwiler
patent: 3042970 (1962-07-01), Terenzi
patent: 3306342 (1967-02-01), Di Salvo et al.
patent: 3420245 (1969-01-01), Kiefer et al.
patent: 3441473 (1969-04-01), Boundige et al.
patent: 3483282 (1969-12-01), Manjikian
patent: 3573158 (1971-03-01), Pall et al.
patent: 3615024 (1971-10-01), Michaels
patent: 3666508 (1972-05-01), Justice et al.

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