Methods of producing a paper product

• US 9,945,073 B2
• Filed: 06/16/2017
• Issued: 04/17/2018
• Est. Priority Date: 04/20/2004
• Status: Active Grant

• Current Assignee: The Research Foundation for The State University of New York (State University of New York)
• Original Assignee: The Research Foundation for The State University of New York (State University of New York)
• Inventors: Amidon, Thomas E., Francis, Raymond, Scott, Gary M., Bartholomew, Jeremy, Ramarao, Bandaru V., Wood, Christopher D.
• Primary Examiner(s): Fortuna, Jose A
• Application Number:
  US15/625,545
• Publication Number:
  US 20170306557A1
• Time in Patent Office: 305 Days
• Field of Search: 162 14, 162 17, 162 19, 162 24, 162 26, 162 29, 162 3011, 162 41- 43, 162 47, 162 52, 162 55, 162 63- 67, 162 70, 162 72, 162 78, 162 82, 162 87
• CPC Class Codes: D21C 1/02 with water or steam
• CPC Class Codes: D21C 11/0007 Recovery of by-products, i.e. compounds other than those necessary for pulping, for multiple uses or not otherwise provided for volatile compounds obtained by decomposition of spent liquors in order to regenerate them D21C11/125; compounds obtained by fractionating the liquors in order to regenerate them D21C11/0042
• CPC Class Codes: D21C 3/00 Pulping cellulose-containing materials digesters D21C7/00
• CPC Class Codes: D21C 3/02 with inorganic bases or alkaline reacting compounds, e.g. sulfate processes
• CPC Class Codes: D21C 3/04 with acids, acid salts or acid anhydrides D21C3/003 and D21C3/222 take precedence
• CPC Class Codes: D21C 3/222 Use of compounds accelerating the pulping processes
• CPC Class Codes: D21C 5/005 Treatment of cellulose-containing material with microorganisms or enzymes
• CPC Class Codes: D21C 9/1057 Multistage, with compounds cited in more than one sub-group D21C9/10, D21C9/12, D21C9/16
• CPC Class Codes: D21C 9/1063 with compounds not otherwise provided for, e.g. activated gases
• CPC Class Codes: D21C 9/123 with Cl2O
• CPC Class Codes: D21C 9/147 with oxygen or its allotropic modifications D21C9/16 takes precedence
• CPC Class Codes: D21C 9/163 with peroxides
• CPC Class Codes: D21H 11/02 Chemical or chemomechanical or chemothermomechanical pulp
• CPC Class Codes: D21H 11/08 Mechanical or thermomechanical pulp
• CPC Class Codes: D21H 11/10 Mixtures of chemical and mechanical pulp
• CPC Class Codes: D21H 17/005 Microorganisms or enzymes
• CPC Class Codes: D21H 21/32 Bleaching agents bleaching cellulose pulp D21C9/10

Abstract

An omnibus process of pulping and bleaching lignocellulosic materials in which a charge of a lignocellulosic material is biopulped and/or water extracted prior to pulping and bleaching. The lignocellulosic material may be mechanically pulped and bleached in the presence of an enzyme that breaks lignin-carbohydrate complexes.

Claims

1. A process of pulping lignocellulosic materials comprising:

(a) contacting a charge of a lignocellulosic material with water, the water and charge of lignocellulosic material maintained at a temperature in the range of between about 130°

C. and about 200°

C. and lowering the pH to between about 3 and about 6.9 by producing acetic acid from the reaction of the water and lignocellulosic material for a period in the range of between about 15 minutes and about 240 minutes, wherein an aqueous extract and extracted lignocellulosic materials are obtained;

(b) pulping said extracted lignocellulosic materials with a mixture of a hydroxide and an anthraquinone (AQ) wherein individual fibers and fiber bundles are produced; and

(c) apply O₂ delignification to the individual fibers and fiber bundles to form a delignified mass, wherein the delignified mass has an O₂ kappa value of 9.0 or less after about 90 minutes.

2. The process of claim 1, wherein the hydroxide is selected from the group consisting of sodium hydroxide, potassium hydroxide and mixtures thereof.

3. The process of claim 1, wherein the AQ is a sodium anthraquinone-2-sulfonate (SAQ).

4. The process of claim 1, wherein the AQ is a 2-methylanthraquinone (MAQ).

5. The process of claim 1, wherein the concentration of the AQ in the mixture is 0.05-0.1%.