Apparatus for acetylating cellulose

Details Apparatus for acetylating cellulose Apparatus for acetylating cellulose

1998-06-08

1999-07-27

Nutter, Nathan M.

Chemical apparatus and process disinfecting, deodorizing, preser

Chemical reactor

With means applying electromagnetic wave energy or...

422189, 422190, 422191, 422192, 422193, 422194, 536 69, 536 70, 536 71, 536 73, 536 74, 536 76, B01J 804, B01J 1000

Patent

active

059286130

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: 4234718 (1980-11-01), Brown
patent: 4590266 (1986-05-01), Yamashita et al.
patent: 5371207 (1994-12-01), Zhuang

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