Process for coagulation, washing and leaching of shaped polybenz

Details Process for coagulation, washing and leaching of shaped polybenz Process for coagulation, washing and leaching of shaped polybenz

1993-01-05

1994-03-08

Thurlow, Jeffery

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

With prevention of equipment fouling accumulations or deposits

264184, 264233, 26433111, 26433112, 264344, 528183, B29C 7102

Patent

active

052924696

ABSTRACT:
Articles (other than fiber) made from polybenzazole dopes can quickly be washed to remove polyphosphoric acid by a combination of initially washing with an acidic liquid and second washing with a hot leaching fluid at at least about 60.degree. C. The process can reach acceptable residual phosphorous levels (1500-2000 ppm) in as little as about 2 or 3 minutes.

REFERENCES:
patent: 3619453 (1971-11-01), Riggs
patent: 3699038 (1972-10-01), Boom
patent: 4554119 (1985-11-01), Chenevey
patent: 4606875 (1986-08-01), Chenevey et al.
patent: 4717619 (1988-01-01), Letinski
patent: 4898924 (1990-02-01), Chenevey et al.
patent: 4973442 (1990-11-01), Harvey et al.
patent: 4977223 (1990-12-01), Arnold et al.
patent: 5102601 (1992-04-01), Farris et al.
patent: 5164131 (1992-11-01), Chau et al.

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