Organic compounds -- part of the class 532-570 series – Organic compounds – Carbohydrates or derivatives
Patent
1997-01-22
1999-02-09
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, 536 76, 536124, C08B 306, B01J 1900
Patent
active
058696466
ABSTRACT:
In a production process of a cellulose acetate which comprises (a) a reduced pressure-acetylation step of acetylating a cellulose under a reduced pressure in the presence of sulfuric acid or other acidic catalyst, with distilling off a gaseous phase component of the reaction system out of the system, and (b) a post-acetylation step of allowing the acetylation to further proceed by increasing the pressure as compared with the pressure of the reduced pressure-acetylation step by means of release of the pressure reduction of the reaction system or the like, the shift operation from the reduced pressure-acetylation step to the post-acetylation step is conducted by taking a distilling rate of a distillate in the reduced pressure-acetylation step as an index to control the reaction temperature of the post-acetylation step. The shift operation from the reduced pressure-acetylation step to the post-acetylation step may also be conducted by taking a distilling rate after the distilling rate in the reduced pressure-acetylation step has reached a maximum value.
REFERENCES:
patent: 4590266 (1986-05-01), Yamashita et al.
patent: 5371207 (1994-12-01), Zhuang
Daicel Chemical Industries Ltd.
Nutter Nathan M.
LandOfFree
Method and apparatus for acetylating cellulose does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and apparatus for acetylating cellulose, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for acetylating cellulose will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1949616