Functionalizing cellulosic and lignocellulosic materials

Patent metadata

Field	Value
Publication number	US-9422667-B2
Application number	US-201514918861-A
Country	US
Kind code	B2
Filing date	Oct 21, 2015
Priority date	Apr 30, 2008
Publication date	Aug 23, 2016
Grant date	Aug 23, 2016

Abstract

Irradiated lignocellulosic or cellulosic materials are provided which contain carboxylic acid groups and/or other functional groups not present in a naturally occurring cellulosic or lignocellulosic material from which the irradiated material was obtained.

First claim

What is claimed is:

1. A method comprising:
irradiating a lignocellulosic or cellulosic material with from about 10 Mrad to about 100 Mrad of radiation by contacting the material with heavy charged ions, to provide an irradiated lignocellulosic or cellulosic material having a functionality different from that of the cellulosic or lignocellulosic material from which the irradiated material was obtained.

2. The method of claim 1 wherein the treated material comprises functional groups selected from the group consisting of carboxylic acid groups, aldehyde groups, nitroso groups, nitrile groups, nitro groups, ketone groups, amino groups, alkyl amino groups, alkyl groups, chloroalkyl groups, chlorofluoroalkyl groups, and enol groups.

3. The method of claim 1 wherein the cellulosic or lignocellulosic material is selected from the group consisting of wood, paper, and textile fibers.

4. The method of claim 1 wherein the lignocellulosic or cellulosic material comprises a fibrous material.

5. The method of claim 1 wherein the heavy charged ions are selected from the group consisting of nitrogen, sulfur and phosphorus ions.

6. The method of claim 1 , wherein the irradiated material comprises a mixture of nitrile groups and carboxylic acid groups.

7. The method of claim 1 , wherein the material is irradiated with about 25 Mrad to about 75 Mrad of radiation.

Assignees

• Xyleco Inc

Inventors

• Medoff Marshall

Classifications

• D21H25/04 Primary

  Physical treatment, e.g. heating, irradiating (D21H25/18 takes precedence; dryer section of machines for making continuous webs of paper D21F5/00) · CPC title

• D21C9/007

  by mechanical or physical means · CPC title

• C08H8/00

  Macromolecular compounds derived from lignocellulosic materials {(pretreatment thereof B27N)} · CPC title

• D21H11/04 Primary

  Kraft or sulfate pulp · CPC title

• C08B15/00

  Preparation of other cellulose derivatives or modified cellulose {, e.g. complexes} · CPC title