Cellulose powder and processes for its production
US-9163095-B2 · Oct 20, 2015 · US
Cellulose suspension, method for the production and use thereof
US9822188B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9822188-B2 |
| Application number | US-201415027937-A |
| Country | US |
| Kind code | B2 |
| Filing date | Nov 14, 2014 |
| Priority date | Oct 15, 2013 |
| Publication date | Nov 21, 2017 |
| Grant date | Nov 21, 2017 |
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Abstract
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The present invention relates to a phase-stable suspension of cellulose II in water, having a high water retention capacity and a cellulose concentration between 0.1 and 5.0% by weight, a method of its preparation, and its use.
First claim
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What is claimed is: 1. A method for preparing a phase-stable suspension of cellulose II in water, comprising the following steps: a. preparing a spinning dope with 10 to 15% by weight of cellulose according to the lyocell process, b. precipitating the cellulose, whereby a material containing NMMO and cellulose is obtained, c. washing the material to remove NMMO d. enzymatic treatment of the washed moist material, e. comminution in a comminution unit, whereby a coarse cellulose suspension is obtained, and f. microcomminution in a high pressure homogenizer into a stable microsuspension. 2. The method as claimed in claim 1 , wherein an endoglucanase or a mixture of endoglucanases and exoglucanases is used as the enzyme in step d. 3. The method as claimed in claim 1 , wherein the enzyme concentration in step d. is 0.1 to 10.0% by weight, related to the cellulose quantity. 4. The method as claimed in claim 1 , wherein the pressure in the high pressure homogenizer in step f is between 100 and 2000 bar. 5. The method as claimed in claim 1 , wherein in step f the suspension is passed between 1 and 10 times, through the high pressure homogenizer. 6. The method as claimed in claim 1 , wherein in step a. the cellulose concentration is 12 to 14% by weight. 7. The method as claimed in claim 5 , wherein in step f. the suspension is passed between 1 and 4 times through the high pressure homogenizer.
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Frequently asked questions
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- What does patent US9822188B2 cover?
- The present invention relates to a phase-stable suspension of cellulose II in water, having a high water retention capacity and a cellulose concentration between 0.1 and 5.0% by weight, a method of its preparation, and its use.
- Who is the assignee on this patent?
- Chemiefaser Lenzing Ag
- What technology area does this patent fall under?
- Primary CPC classification C08J3/075. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Nov 21 2017 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 1 related publication on this page (citations in our corpus or others sharing the same primary CPC).