Process for shaping cellulose ethers
The present invention relates to a process for the manufacture of cellulose ethers. The process involves: (a) providing a perforated disk having a plurality of perforations; and (b) forcing feed cellulose ether through at least some of the perforations of the perforated disk, thereby forming compressed cellulose ether. The compressed cellulose ether formed in accordance with the method of the present invention has a higher bulk density and a more uniform particle size distribution than known cellulose ethers prepared by other processes.
1 . A method of preparing cellulose ethers comprising:
(a) providing a perforated disk having a plurality of perforations; and
(b) forcing feed cellulose ether through at least some of the perforations of said perforated disk,
thereby forming compressed cellulose ether.
2 . The method of claim 1 wherein the feed cellulose ether is forced through said perforations at a compression ratio P of 0.5 to 5.0.
3 . The method of claim 2 wherein said compression ratio P is 2.0 to 4.0.
4 . The method of claim 1 wherein the feed cellulose ether is forced through said perforations by means of one or more rotating edge runners.
5 . The method of claim 1 wherein the feed cellulose ether is forced through said perforations by means of one or more oscillating wheels.
6 . The method of claim 1 wherein the feed cellulose ether is forced through said perforations by means of rolls.
7 . The method of claim 1 further comprising separating the compressed cellulose ether, after passing through the perforations of the perforated disk, into pieces of desired length.
8 . The method of claim 1 wherein the compressed cellulose ether is selected from the group consisting of carboxymethyl cellulose, hydroxyethyl carboxymethyl cellulose, carboxymethyl sulfoethyl cellulose, sulfoethyl cellulose, hydroxyethyl methyl cellulose, hydroxypropyl methyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, ethyl hydroxyethyl cellulose, methyl cellulose and combinations thereof.
9 . The method of claim 1 wherein the compressed cellulose ether has a bulk density of from 400 g/l to 800 g/l.
10 . The method of claim 9 wherein the compressed cellulose ether has a particle size distribution of from 125 μm to 1000 μm, and a mean particle size of 500 μm.
11 . The compressed cellulose ether prepared by the method of claim 1.