ClassID:

126361

D21C3/24 - CPC Classification

Classification description:

Pulping cellulose-containing materials; Other features of pulping processes Continuous processes

Recent Application in this class:
#1
20250314012
2025-10-09

USE OF CELLULASE TO IMPROVE VISCOSITY CONTROL OF KRAFT DISSOLVING PULP

#2
20250290251
2025-09-18

APPARATUS FOR PROCESSING FIBROUS MATERIALS

#3
20250052002
2025-02-13

OPTIMIZATION OF CHEMICAL CONSUMPTION IN BIOMASS DELIGNIFICATION

#4
20220018065
2022-01-20

METHOD OF PRODUCING HOLOCELLULOSE AND PAPER STRENGTH AGENT, PROCESS FOR THE PRODUCTION OF PAPER, THE PAPER PRODUCED AND USE OF THE PRODUCED PAPER

#5
20220002944
2022-01-06

Method of feeding wood chips to a prehydrolysis reactor

#6
20210309449
2021-10-07

Outlet system for transporting comminuted lignocellulosic material from a vessel and vessel comprising such an outlet system

#7
20210285156
2021-09-16

Method of transforming high consistency pulp fibers into pre-dispersed semi-dry and dry fibrous materials

#8
20210148047
2021-05-20

Predictive control system and method for brown washing treatment in pulp mills

#9
20200181838
2020-06-11

Method of producing chemical pulp

#10
20190292725
2019-09-26

Method and a system for production of high molecular weight lignin

#11
20190257031
2019-08-22

Use of Cellulase to improve Viscosity Control of Dissolving Pulp

#12
20190218712
2019-07-18

Method for generation of clean steam in a continous digester system

#13
20190194867
2019-06-27

DOUBLE ALKALI CHARGING FOR CHIP IMPREGNATION

#14
20170275818
2017-09-28

Cost efficient kraft cooking method using polysulfide cooking liquor

#15
20170268168
2017-09-21

Method for continuously cooking grass raw materials and device

#16
20170260693
2017-09-14

Heating of hydraulic digesters

#17
20170175328
2017-06-22

METHOD AND APPARATUS FOR PUMPING SAWDUST FEED IN A SAWDUST PULPING SYSTEM

#18
20170107665
2017-04-20

Continuous process for production of cellulose pulp from grass-like plant feedstock

#19
20170022664
2017-01-26

METHOD OF DIGESTING CELLULOSE FIBROUS MATERIAL IN A CONTINUOUS DIGESTER

#20
20170022663
2017-01-26

Kraft cooking method using polysulfide cooking liquor

#21
20160002849
2016-01-07

Softwood kraft fiber having an improved α-cellulose content and its use in the production of chemical cellulose products

#22
20150337491
2015-11-26

Digester shell extension

#23
20150007809
2015-01-08

Method of digesting lignocellulosic material

#24
20140246158
2014-09-04

Two vessel reactor system and method for hydrolysis and digestion of wood chips with chemical enhanced wash method

#25
20140224441
2014-08-14

Feeding system having pumps in parallel for a continuous digester

#26
20140138039
2014-05-22

Feeding system comprising pumps in parallel for a continuous digester

#27
20140102648
2014-04-17

METHOD AND ARRANGEMENT FOR TREATING CHEMICAL PULP

#28
20140069598
2014-03-13

Method and arrangement for adding treatment liquors to cellulose material in a down flow vessel

#29
20130105098
2013-05-02

Method and system for impregnating chips

#30
20120241112
2012-09-27

Method and arrangement for improving a washing step after completed cooking in a continuous digester

#31
20120211183
2012-08-23

Method and apparatus to produce pulp using pre-hydrolysis and Kraft cooking

#32
20120067533
2012-03-22

Cooking process of lignocellulose material

#33
20110259539
2011-10-27

Feeding system having pumps in parallel for a continuous digester

#34
20110203755
2011-08-25

Method for preventing clogging in a strainer construction for a continuous digester

#35
20110186250
2011-08-04

Continuous digestion of chip blends containing a western red cedar chip furnish

#36
20110100572
2011-05-05

Method for kraft pulp production where hemicelluloses are returned

#37
20110083822
2011-04-14

Feeding system having parallel pumps for a continuous digester

#38
20110073266
2011-03-31

Feeding system having pumps in parallel for a continuous digester

#39
20110067833
2011-03-24

Feeding system having pumps in parallel and individual flows for a digester

#40
20110067828
2011-03-24

Continuous digester system

#41
20110056642
2011-03-10

Feeding system having pumps in parallel for a continuous digester

#42
20100326611
2010-12-30

Vapour phase digester and a method for continuous cooking

#43
20100266351
2010-10-21

Unobstructed low pressure outlet and screen grid for a high pressure feeder

#44
20100132897
2010-06-03

Method and arrangement for continuous cooking

#45
20100071861
2010-03-25

Method for an energy efficient production of cellulose pulp in a continuous digester

#46
20100051222
2010-03-04

Continuous digester system

#47
20100012283
2010-01-21

Method to use heat energy from black liquor

#48
20090288793
2009-11-26

Method and device for the continuous cooking of pulp

#49
20090236059
2009-09-24

Digester wash extraction by individual screen flow control

#50
20090071615
2009-03-19

Continuous digester with fluid circulation

#51
20090056890
2009-03-05

Digester wash extraction by individual screen flow control

#52
20090020244
2009-01-22

IMPREGNATION VESSEL WITH CONVERGENCE SIDE RELIEF AND METHOD FOR HEAT INJECTION AT CONVERGENCE

#53
20080314534
2008-12-25

Method and system for direct contact of hot liquor with wood chips in transfer circulation

#54
20080302492
2008-12-11

Two vessel reactor system and method for hydrolysis and digestion of wood chips with chemical enhanced wash method

#55
20080202717
2008-08-28

Arrangement for feeding a slurry of chips and liquid

#56
20080202712
2008-08-28

Method and device for the continuous cooking of pulp

#57
20080029233
2008-02-07

MOVING BED BIOMASS FRACTIONATION SYSTEM AND METHOD

#58
20070256801
2007-11-08

Alkaline Process and System for Producing Pulp

#59
20070227681
2007-10-04

Apparatus for decreasing scaling in digester systems

#60
20070187053
2007-08-16

Method and arrangement of impregnating chips

#61
20070187052
2007-08-16

Method for impregnating chips in a continuous digestion system

#62
20070151691
2007-07-05

Method for converting a digester for use as a gas phase and hydraulic phase continuous digester

#63
20070095490
2007-05-03

Feed of a mixture of chips and fluid from a low-pressure system to a high-pressure system

#64
20070056707
2007-03-15

Continuous digester with fluid circulation

#65
20070000626
2007-01-04

Gas phase continuous digester having an inverted top separator with liquor injection

#66
20060162880
2006-07-27

Method and a digester for the continuous cooking of wood raw material to cellulose pulp

#67
20060070709
2006-04-06

Method for the continuous cooking of wood raw material for cellulose pulp

#68
20050284592
2005-12-29

Methods to decrease scaling in digester systems

#69
20050279468
2005-12-22

Method and system for feeding cellulose chips to a high pressure continuous cooking system

#70
20050274468
2005-12-15

Central screen

#71
20050274467
2005-12-15

Digester wash extraction by individual screen flow control

#72
20050173081
2005-08-11

Method for continuous cooking

#73
20050061464
2005-03-24

Feeding arrangement for feeding of chips to chip bins

#74
20050061459
2005-03-24

Continuous digester

#75
20050061458
2005-03-24

Method and arrangement for impregnating chips