Process for the manufacture of cellulose acetate

Details Process for the manufacture of cellulose acetate Process for the manufacture of cellulose acetate

1995-12-18

1997-03-04

Nutter, Nathan M.

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

Organic compounds

Carbohydrates or derivatives

536 70, 536 71, 536 73, 536 74, B08B 306, B08B 102

Patent

active

056080506

ABSTRACT:
The specification discloses a process for the manufacture of cellulose acetate. The process reacts, at a temperature suitable for acetylation, an acetic acid activated pretreated cellulose raw material containing 100 parts cellulose by dry weight, and 0.5 to 40 parts of a bisulfate catalyst by dry weight of the cellulose. The bisulfate catalyst is selected from lithium bisulfate, sodium bisulfate, and potassium bisulfate. To enhance mixing with the activated and pretreated cellulose, the catalyst may be mixed with 2 to 4 parts of acetic anhydride by dry weight of the cellulose, and 4 to 6 parts of acetic acid by dry weight of the cellulose. In a further embodiment, 0.05 to 10 parts of a strong Bronsted acid by weight of the dry cellulose may be added as a co-catalyst.

REFERENCES:
patent: 2585516 (1952-02-01), Thomas
patent: 2923706 (1960-02-01), Campbell et al.
patent: 3755297 (1973-08-01), Campbell et al.
patent: 3767642 (1973-10-01), Campbell et al.
patent: 4439605 (1984-03-01), Yabune et al.
Malm et al (eds) "Cellulose and Cellulose Derivatives", Part 2 of High Polymers, 5, 2, Interscience Publishers (1954).
Takahashi et al, Kobunshi Kagaku, 27, 302, p. 394, (1970).

Affiliated with

Also associated with

Rating

Process for the manufacture of cellulose acetate does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Process for the manufacture of cellulose acetate, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for the manufacture of cellulose acetate will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2146988