Canadian Patents Database / Patent 2823382 Summary

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(12) Patent: (11) CA 2823382
(54) English Title: METHODS OF PROCESSING BIOMASS COMPRISING ELECTRON-BEAM RADIATION
(54) French Title: METHODE DE TRAITEMENT D'UNE BIOMASSE INCLUANT UN RAYONNEMENT PAR FAISCEAU ELECTRONIQUE
(51) International Patent Classification (IPC):
  • D21C 1/10 (2006.01)
  • D21B 1/04 (2006.01)
(72) Inventors (Country):
  • MEDOFF, MARSHALL (United States of America)
(73) Owners (Country):
  • XYLECO, INC. (United States of America)
(71) Applicants (Country):
  • XYLECO, INC. (United States of America)
(74) Agent: SMART & BIGGAR
(45) Issued: 2014-09-09
(22) Filed Date: 2007-10-26
(41) Open to Public Inspection: 2008-06-19
Examination requested: 2013-08-07
(30) Availability of licence: N/A
(30) Language of filing: English

(30) Application Priority Data:
Application No. Country Date
60/854,519 United States of America 2006-10-26
60/863,290 United States of America 2006-10-27
60/859,911 United States of America 2006-11-17
60/875,144 United States of America 2006-12-15
60/881,891 United States of America 2007-01-23

English Abstract

The invention relates to a method comprising: irradiating a lignocellulosic feedstock material in air, using an electron beam, to generate carboxylic acid groups by reaction of the irradiated feedstock with the air and thereby provide an irradiated lignocellulosic material having a larger number of carboxylic acid groups than the lignocellulosic material from which the irradiated material was obtained.


French Abstract

L'invention porte sur une méthode comprenant l'irradiation d'un matériau d'alimentation lignocellulosique dans l'air à l'aide d'un faisceau d'électrons pour générer des groupes d'acide carboxylique par réaction du matériau irradié avec l'air et ainsi de fournir un matériau lignocellulosique irradié ayant un nombre plus grand de groupes acide carboxylique que le matériau lignocellulosique duquel le matériau irradié a été obtenu.


Note: Claims are shown in the official language in which they were submitted.

CLAIMS:
1. A method comprising:
irradiating a lignocellulosic feedstock material in air, using an electron
beam,
to generate carboxylic acid groups by reaction of the irradiated feedstock
with the air and
thereby provide an irradiated lignocellulosic material having a larger number
of carboxylic
acid groups than the lignocellulosic material from which the irradiated
material was obtained;
wherein irradiating is performed at a dose rate of 1 Mrad/s to 10 Mrad/s.
2. The method of claim 1 wherein the irradiated material further comprises
functional groups selected from the group consisting of hydroxyl groups,
aldehyde groups,
ketone groups and ester groups.
3. The method of claim 1 or 2 wherein irradiating comprises applying to the

lignocellulosic feedstock material a total dose of between 10 Mrad and 150
Mrad.
4. The method of any one of claims 1 to 3 wherein the lignocellulosic
feedstock
material is selected from the group consisting of grasses, rice hulls,
bagasse, jute, hemp, flax,
bamboo, sisal, abaca, straw, corn cobs, corn stover, alfalfa, hay, coconut
hair, seaweed, algae,
and mixtures thereof.
5. The method of any one of claims 1 to 4 wherein irradiating comprises
applying
to the lignocellulosic feedstock material a total dose of between about 20
MRad and about
50 MRad.
6. The method of any one of claims 1 to 5 wherein the electron beam
delivers
electrons having an energy of about 0.3 MeV to about 2.0 MeV.
7. The method of any one of claims 1 to 6 further comprising subjecting the

lignocellulosic material to one or more of the following: stone grinding,
mechanical ripping
or tearing, pin grinding, milling, or air attrition milling.
130

8. The method of claim 7 wherein, following grinding, ripping, tearing or
milling,
the irradiated lignocellulosic material has a bulk density of less than about
0.5 g/cm3.
9. The method of any one of claims 1 to 8 wherein the lignocellulosic
feedstock
material has, prior to physical treatment, a bulk density of greater than
about 0.7 g/cm3.
10. The method of any one of claims 1 to 9 wherein the lignocellulosic
feedstock
material has a Brunauer-Emmett-Teller (BET) surface area of greater than 0.25
m2/g.
11. The method of any one of claims 1 to 9 wherein the lignocellulosic
feedstock
material has a length to diameter ratio of at least 5.
12. The method of any one of claims 1 to 11 wherein irradiating comprises
applying radiation to the lignocellulosic feedstock material with more than
one electron beam
device.
13. The method of any one of claims 1 to 12, further comprising treating
the
lignocellulosic material with a chemical.
14. The method of claim 13 wherein the chemical is a base, a mineral acid,
or a
base and a mineral acid.
15. The method of claim 14 wherein the material is treated with a base
selected
from the group consisting of sodium hydroxide, potassium hydroxide, lithium
hydroxide and
ammonium hydroxide.
16. The method of claim 15 wherein the material is treated with potassium
hydroxide.
17. The method of claim 14 wherein the material is treated with a mineral
acid
selected from the group consisting of sulfuric acid, hydrochloric acid and
phosphoric acid.
18. The method of claim 17 wherein the material is treated with sulfuric
acid.

131


A single figure which represents the drawing illustrating the invention.

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Admin Status

Title Date
(22) Filed 2007-10-26
(41) Open to Public Inspection 2008-06-19
Examination Requested 2013-08-07
(45) Issued 2014-09-09

Maintenance Fee

Description Date Amount
Last Payment 2017-10-23 $250.00
Next Payment if small entity fee 2018-10-26 $125.00
Next Payment if standard fee 2018-10-26 $250.00

Note : If the full payment has not been received on or before the date indicated, a further fee may be required which may be one of the following

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Payment History

Fee Type Anniversary Year Due Date Amount Paid Paid Date
Request for Examination $800.00 2013-08-07
Registration of Documents $100.00 2013-08-07
Filing $400.00 2013-08-07
Maintenance Fee - Application - New Act 2 2009-10-26 $100.00 2013-08-07
Maintenance Fee - Application - New Act 3 2010-10-26 $100.00 2013-08-07
Maintenance Fee - Application - New Act 4 2011-10-26 $100.00 2013-08-07
Maintenance Fee - Application - New Act 5 2012-10-26 $200.00 2013-08-07
Maintenance Fee - Application - New Act 6 2013-10-28 $200.00 2013-08-07
Final $702.00 2014-06-17
Maintenance Fee - Patent - New Act 7 2014-10-27 $200.00 2014-10-20
Maintenance Fee - Patent - New Act 8 2015-10-26 $200.00 2015-10-19
Maintenance Fee - Patent - New Act 9 2016-10-26 $200.00 2016-10-24
Maintenance Fee - Patent - New Act 10 2017-10-26 $250.00 2017-10-23

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Drawings 2014-01-24 35 1,925
Claims 2014-01-24 3 108
Description 2014-01-24 130 6,964
Drawings 2014-03-28 35 1,923
Claims 2014-03-28 2 75
Description 2014-03-28 130 6,945
Abstract 2013-08-07 1 14
Description 2013-08-07 130 6,952
Claims 2013-08-07 2 78
Drawings 2013-08-07 35 1,227
Representative Drawing 2013-09-25 1 5
Cover Page 2013-10-01 1 35
Representative Drawing 2014-08-19 1 8
Cover Page 2014-08-19 1 37
Prosecution-Amendment 2013-08-07 1 51
Correspondence 2013-08-22 1 41
Prosecution-Amendment 2013-09-25 1 20
Prosecution-Amendment 2013-11-06 3 140
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Correspondence 2014-06-17 2 76