Functionalizing cellulosic and lignocellulosic materials

Patent metadata

Field	Value
Publication number	US-2016333528-A1
Application number	US-201615219101-A
Country	US
Kind code	A1
Filing date	Jul 25, 2016
Priority date	Apr 30, 2008
Publication date	Nov 17, 2016
Grant date	—

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 less than 10 Mrad of electron beam radiation, electrons in the electron beam having an energy of from about 0.7 to 2.0 MeV, 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 irradiated material comprises a mixture of nitrile groups and carboxylic acid groups.

3 . The method of claim 1 wherein the naturally occurring lignocellulosic fibrous material has a lignin content of at least 2%.

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

5 . The method of claim 1 wherein the irradiated lignocellulosic material comprises a plurality of saccharide units arranged in a molecular chain, wherein from about 1 out of every 2 to about 1 out of every 250 saccharide units comprises a carboxylic acid group, or an ester or salt thereof, wherein the number of carboxylic acid groups is determined by titration.

6 . The method of claim 5 , wherein the material includes a plurality of said molecular chains.

7 . The method of claim 6 , wherein each chain comprises hemicellulose or cellulose.

8 . The method of claim 6 , wherein from about 1 out of every 10 to about 1 out of every 1000 saccharide units of each chain comprises a nitroso, nitro, or nitrile group.

9 . The method of claim 6 , wherein from about 1 out of every 35 to about 1 out of every 750 saccharide units of each chain comprises a nitroso, nitro, or nitrile group.

10 . The method of claim 5 , wherein from about 1 out of every 5 to about 1 out of every 250 saccharide units of each chain comprises a carboxylic acid group, or an ester or salt thereof.

11 . The method of claim 5 , wherein from about 1 out of every 8 to about 1 out of every 100 saccharide units of each chain comprises a carboxylic acid group, or an ester or salt thereof.

12 . The method of claim 5 , wherein from about 1 out of every 10 to about 1 out of every 50 saccharide units of each chain comprise a carboxylic acid group, or an ester or salt thereof.

13 . The method of claim 5 , wherein the saccharide units comprise 5 or 6 carbon saccharide units.

14 . The method of claim 5 , wherein each chain has between about 10 and about 200 saccharide units.

15 . The method of claim 5 , wherein the average molecular weight of the material relative to PEG standards is from about 1,000 to about 1,000,000, wherein the molecular weight is determined using GPC, utilizing a saturated solution (8.4% by weight) of lithium chloride (LiCl) in dimethyl acetamide (DMAc) as the mobile phase.

16 . The method of claim 5 , wherein from about 1 out of every 5 to about 1 out of every 1500 saccharide units comprises a nitroso, nitro, or nitrile group.

Assignees

• Xyleco Inc

Inventors

• Medoff Marshall

Classifications

• C08B15/00

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

• D21C1/00

  Pretreatment of the finely-divided materials before digesting (of waste paper D21C5/02) · CPC title

• D21H11/16

  modified by a particular after-treatment · CPC title

• D21H11/04

  Kraft or sulfate pulp · CPC title

• C08H8/00

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