Methods of producing a paper product

Patent metadata

Field	Value
Publication number	US-9945073-B2
Application number	US-201715625545-A
Country	US
Kind code	B2
Filing date	Jun 16, 2017
Priority date	Apr 20, 2004
Publication date	Apr 17, 2018
Grant date	Apr 17, 2018

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.

First claim

What is claimed is:

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 O 2 delignification to the individual fibers and fiber bundles to form a delignified mass, wherein the delignified mass has an O 2 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%.

Assignees

• Univ New York State Res Found

Inventors

• Amidon Thomas E
• Francis Raymond
• Scott Gary M
• Bartholomew Jeremy
• Ramarao Bandaru V
• Wood Christopher D

Classifications

• D21C3/222

  Use of compounds accelerating the pulping processes · CPC title

• D21C9/1057

  Multistage, with compounds cited in more than one sub-group D21C9/10, D21C9/12, D21C9/16 · CPC title

• D21C5/005

  Treatment of cellulose-containing material with microorganisms or enzymes · CPC title

• D21C3/02 Primary

  with inorganic bases or alkaline reacting compounds, e.g. sulfate processes · CPC title

• D21H17/005

  Microorganisms or enzymes · CPC title