Method for acetylating shredded cellulosic

Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – With chemical or physical modification of liberated fiber

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

162 23, 1621576, 162207, 536 69, 536 70, C08B 306, D21C 112

Patent

active

050369008

ABSTRACT:
Cellulosic sheet material is processed in preparation for esterification for example acetylation to produce cellulose acetate, by treating the sheet material with water and then feeding the wetted material into a machine that simultaneously shreds and dries the material. The conditions in the machine are carefully controlled (outlet temperature not in excess of 110.degree. C. and moisture content 4-15% by weight) to ensure that the cellulosic material does not become deactivated towards esterification. The method enables low alpha content cellulosic material supplied in the form of high density sheet to be acetylated to produce high quality cellulose acetate flake.

REFERENCES:
patent: 1851008 (1932-05-01), Hanson et al.
patent: 2008021 (1935-07-01), Kenety
patent: 2054301 (1936-09-01), Richter
patent: 2105498 (1938-01-01), Parrett et al.
patent: 2393783 (1946-01-01), Kridel
patent: 2415949 (1947-02-01), Holloway et al.
patent: 2478396 (1949-08-01), Hincke et al.
patent: 2603637 (1952-07-01), Blackman et al.
patent: 3808090 (1974-04-01), Logan et al.
patent: 4601759 (1986-07-01), Furubayashi et al.
Rydholm, Pulping Processes, Interscience Publishers, New York, Sep. 1967, pp. 1166-1173.
Nelson et al., "Activation of Cellulose for Acetylation by Mechanical Refining in Acetic Acid", Tappi Dissolving Pulp Conference, 1973, pp. 69-82.
Tedesco et al., "Effect of Pulp Alpha Content on Acetate End-Use Properties--Possible Techniques to Allow Greater Utilization of Lower Alpha Pulps for Acetate Production", Tappi Dissolving Pulp Conference, 1977, pp. 84-87.

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Method for acetylating shredded cellulosic 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 for acetylating shredded cellulosic, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for acetylating shredded cellulosic will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-1980321

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.