Methods for preparing alkali cellulose and cellulose ether
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United States of America Patent
Stats
-
Jun 21, 2016
Grant Date -
Aug 23, 2012
app pub date -
Feb 16, 2012
filing date -
Feb 21, 2011
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
Provided is a method for efficiently preparing alkali cellulose having a uniform alkali distribution. More specifically, provided are a methods for preparing alkali cellulose comprising a contact filtration step of bringing a pulp into contact with an alkali metal hydroxide solution on a moving filtration plane for vacuum filtration to collect a contact product remaining on the filtration plane, and a draining step of draining the contact product; and a method of preparing cellulose ether by using the alkali cellulose. Also provided is an apparatus for preparing alkali cellulose comprising a continuous horizontal vacuum filter type contactor.
First Claim
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International Classification(s)
- 2012 Application Filing Year
- C08B Class
- 536 Applications Filed
- 239 Patents Issued To-Date
- 44.59 % Issued To-Date
Cited Art Landscape
Patent Citation Ranking
- 0 Citation Count
- C08B Class
- 0 % this patent is cited more than
- 9 Age
Maintenance Fees
| Fee | Large entity fee | small entity fee | micro entity fee | due date |
|---|---|---|---|---|
| 11.5 Year Payment | $7400.00 | $3700.00 | $1850.00 | Dec 21, 2027 |
