Methods of producing a paper product

Patent metadata

Field	Value
Publication number	US-9683329-B2
Application number	US-201615051742-A
Country	US
Kind code	B2
Filing date	Feb 24, 2016
Priority date	Apr 20, 2004
Publication date	Jun 20, 2017
Grant date	Jun 20, 2017

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 method of producing a pulp, the method comprising:
(a) providing a charge of lignocellulosic material;
(b) contacting the charge of 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 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 and wherein the acid comprises acetic acid; and
(c) pulping the extracted lignocellulosic materials to produce the pulp, wherein the pulp has a viscosity of greater than about 30 cP.

2. The method of claim 1 , wherein the water and charge of lignocellulosic material are maintained at a temperature in the range of between about 145° C. and about 185° C.

3. The method of claim 1 , wherein the pulp has a viscosity of greater than about 40 cP.

4. The method of claim 1 , wherein the pulping step produces individual fibers and fiber bundles having a kappa number of at most about 18 after about 15 minutes.

5. The method of claim 1 , wherein the pulping step produces individual fibers and fiber bundles having a kappa number of at most about 11 after about 30 minutes.

6. The method of claim 1 , wherein the pulping step produces individual fibers and fiber bundles having a kappa number of at most about 7 after about 60 minutes.

7. The method of claim 1 , wherein oxygen delignification reduces a kappa number of the pulp by at least 40%.

8. The method of claim 1 further comprising a step (d) a bleaching step, wherein said bleaching step is effectuated by contacting said pulp of said step (c) with an oxidizing agent selected from the group consisting of oxygen, hydrogen peroxide, ozone, peracetic acid, chlorine, chlorine dioxide, a hypochlorite anion and mixtures thereof, to form a bleached pulp.

9. The method of claim 8 , wherein the bleached pulp has a brightness of greater than 90%.

10. The method of claim 8 , wherein the bleached pulp has a brightness of greater than 91%.

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

• D21C1/02

  with water or steam · CPC title

• D21C3/02 Primary

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

• D21C3/222

  Use of compounds accelerating the pulping processes · CPC title

• D21H21/32

  Bleaching agents (bleaching cellulose pulp D21C9/10) · CPC title

• D21H11/10

  Mixtures of chemical and mechanical pulp · CPC title