Nanocrystalline cellulose and polymer-grafted nanocrystalline cellulose as rheology modifying agents for magnesium oxide and lime slurries

Patent metadata

Field	Value
Publication number	US-10570347-B2
Application number	US-201615293688-A
Country	US
Kind code	B2
Filing date	Oct 14, 2016
Priority date	Oct 15, 2015
Publication date	Feb 25, 2020
Grant date	Feb 25, 2020

Abstract

Rheology modifying agents and methods of modifying the rheology of a slurry are disclosed. Methods for the prevention of fouling and methods for monitoring the rheology of a slurry are also provided. The slurry can be a lime slurry or a magnesium oxide slurry, for example. The rheology modifying agent can be polymer-grafted nanocrystalline cellulose. The rheology modifying agent can optionally include other components, such as a chelating agent.

First claim

What is claimed is:

1. A method of modifying the rheology of a slurry comprising:
adding a rheology modifying agent to a slurry, wherein the rheology modifying agent comprises polymer-grafted nanocrystalline cellulose (NCC),
wherein the slurry is a lime slurry or a magnesium oxide slurry,
wherein the polymer-grafted nanocrystalline cellulose comprises a grafted polymer chain with a molecular weight of at least 200,000 Da.

2. The method of claim 1 , wherein the rheology modifying agent comprises from about 0.1 ppm to about 1,000 ppm of the polymer-grafted NCC.

3. The method of claim 1 , wherein the polymer-grafted NCC comprises acrylamide, acrylic acid, or a combination thereof.

4. The method of claim 1 , wherein the polymer-grafted NCC comprises an anionic monomer, a nonionic monomer, a cationic monomer, or any combination thereof.

5. The method of claim 1 , wherein the polymer-grafted NCC comprises one or more monomers selected from the group consisting of vinyl acetate, acrylic acid, sodium acrylate, ammonium acrylate, methyl acrylate, acrylamide, acrylonitrile, N,N-dimethyl acrylamide, 2-acrylamido-2-methylpropane-1-sulfonic acid, sodium 2-acrylamido-2-methylpropane-1-sulfonate, 3-acrylamidopropyl-trimethyl-ammonium chloride, diallyldimethylammonium chloride, 2-(dimethylamino)ethyl acrylate, 2-(acryloyloxy)-N,N,N-trimethylethanaminium chloride, N,N-dimethylaminoethyl acrylate benzyl chloride quaternary salt, 2-(dimethylamino)ethyl methacrylate, 2-(methacryloyloxy)-N,N,N-trimethyl ethanaminium chloride, 3-(dimethylamino)propyl methacrylamide, methacrylic acid, methacrylic anhydride, methyl methacrylate, methacryloyloxy ethyl trimethyl ammonium chloride, 3-methacrylamidopropyl-trimethyl-ammonium chloride, hexadecyl methacrylate, octadecyl methacrylate, docosyl acrylate, N-vinyl pyrrolidone, 2-vinyl pyridine, 4-vinyl pyridine, epichlorohydrin, N-vinyl formamide, N-vinyl acetamide, 2-hydroxyethyl acrylate, glycidyl methacrylate, 3-(allyloxy)-2-hydroxypropane-1-sulfonate, and 2-(allyloxy)ethanol.

6. The method of claim 1 , wherein the rheology modifying agent comprises a chelating agent selected from the group consisting of ethylenediaminetetraacetic acid (EDTA), citric acid, ligno sulfonates, dimercaprol (2,3-dimercapto-1-propanol), prophine, and any combination thereof.

7. The method of claim 1 , wherein the rheology modifying agent comprises from about 25 ppm to about 100 ppm of acrylamide and acrylic acid-grafted NCC.

8. The method of claim 7 , wherein the rheology modifying agent comprises from about 1 ppm to about 100 ppm of EDTA.

9. The method of claim 1 , wherein the rheology modifying agent comprises about 25 ppm of polyacrylic acid-grafted NCC.

10. The method of claim 9 , wherein the rheology modifying agent comprises from about 1 ppm to about 100 ppm of EDTA.

11. The method of claim 1 , wherein the slurry is a magnesium oxide slurry.

Assignees

• Ecolab Usa Inc

Inventors

• Moghadam Shayan
• Karnati Rangarani
• Bode Heinrich E
• Gill Jasbir S

Classifications

• C08F251/02

  on to cellulose or derivatives thereof · CPC title

• C10G75/04 Primary

  by addition of antifouling agents · CPC title

• C09K8/588

  characterised by the use of specific polymers {(polymeric surfactants C09K8/584)} · CPC title