Laminar flow process of preparing cellulose diacetate fibers

Details Laminar flow process of preparing cellulose diacetate fibers Laminar flow process of preparing cellulose diacetate fibers

1995-12-15

1998-01-06

Truong, Duc

Organic compounds -- part of the class 532-570 series

Organic compounds

Carbohydrates or derivatives

264 458, 264 459, 264200, 536 76, C08B 356

Patent

active

057056315

ABSTRACT:
A laminar flow process for preparing cellulose diacetate fibers is disclosed. In the process, a precipitation-acid stream and an acid-dope stream are contacted in a zone having substantially laminar flow. The acid-dope stream is annularly disposed within and flows in the same direction as the precipitation-acid stream. The precipitation-acid stream has a temperature of 100.degree. to 200.degree. F. and comprises 25 to 35 percent by weight acetic acid and 75 to 65 percent by weight water. The acid-dope stream has a temperature in the range of 100.degree. to 200.degree. F. and comprised of 5 to 22 weight percent of cellulose diacetate having an inherent viscosity of at least 1.0, and 95 to 78 percent by weight of a mixture comprising 65 to 90 weight percent acetic acid and 35 to 10 weight percent water. The precipitation-acid stream has a linear flow greater than or equal to the linear flow of the acid-dope stream. The weight ratio of the precipitation-acid stream to the acid-dope stream is at least 9:1. Contacting the two streams in this manner causes precipitation of cellulose diacetate fibers of predictable diameter as the two streams diffuse together.

REFERENCES:
patent: 1456781 (1923-05-01), Kessler et al.
patent: 2239782 (1941-04-01), Haney et al.
patent: 2287897 (1942-06-01), Martin
patent: 2632686 (1953-03-01), Bashford et al.
patent: 4192838 (1980-03-01), Keith et al.
patent: 4228276 (1980-10-01), Chung-Ming et al.
Gedon et al, "Cellulose Ester, Organic", Kirk-Othmer Encyclopedia of Chemical Technology, 5, p. 510 & 520-524 (1993).
N. Eastman et al, "Cellulose Acetate and Triacetate Fibers", Kirk-Othmer Encyclopedia of Chemical Technology, 3, 5, pp. 105-108 (1979).

Affiliated with

Also associated with

Rating

Laminar flow process of preparing cellulose diacetate fibers does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Laminar flow process of preparing cellulose diacetate fibers, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Laminar flow process of preparing cellulose diacetate fibers will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2330020