ClassID:

91808

C07C51/56 - CPC Classification

Classification description:

Preparation of carboxylic acids or their salts, halides or anhydrides; Preparation of carboxylic acid anhydrides from organic acids, their salts, their esters or their halides, e.g. by carboxylation

Recent Application in this class:
#1
20250304521
2025-10-02

PROCESS FOR GENERATING ACID ANHYDRIDES

#2
20250250220
2025-08-07

CATALYTIC METHODS FOR CARBONYLATION OF ESTERS

#3
20240279150
2024-08-22

PROCESS FOR THE MANUFACTURE OF CARBOXYLIC ANHYDRIDE

#4
20240140900
2024-05-02

Method for manufacturing methyltetrahydrophthalic anhydride

#5
20230174455
2023-06-08

RECYCLED CONTENT TRIACETIN

#6
20230120038
2023-04-20

PROCESS FOR GENERATING ACID ANHYDRIDES

#7
20220371983
2022-11-24

INTEGRATED PROCESS FOR GENERATING ACID ANHYDRIDES

#8
20220235002
2022-07-28

Process for the production of diacyl peroxides

#9
20220235001
2022-07-28

Process for the production of peroxyesters

#10
20210347722
2021-11-11

Process for generating acid anhydrides

#11
20210139403
2021-05-13

Process for the preparation of halogenated carboxylic anhydrides

#12
20200247743
2020-08-06

Processes for purifying acetic acid and hydrating anhydride

#13
20200223778
2020-07-16

Reduction of content of carboxylic acids and derivatives thereof in oleum, disulfuric acid or concentrated sulfuric acid

#14
20200199053
2020-06-25

Processes for preparing 4-methyl-5-nonanone and 4-methyl-5-nonanol

#15
20200199052
2020-06-25

Processes for preparing 4-methyl-5-nonanone and 4-methyl-5-nonanol

#16
20200010402
2020-01-09

Fragrance mixture

#17
20190055184
2019-02-21

Processes for purifying acetic acid and hydrating anhydride

#18
20190002651
2019-01-03

Crosslinking materials from biorenewable aconitic acid

#19
20180141890
2018-05-24

Processes for purifying acetic acid and hydrating anhydride

#20
20170327450
2017-11-16

Process for the manufacture of carboxylic anhydride

#21
20170204043
2017-07-20

Wood acetylation process

#22
20170204042
2017-07-20

Acetic acid recovery from wood acetylation

#23
20170166509
2017-06-15

Recovery and use of wood acetylation fluid

#24
20170157793
2017-06-08

Recovery of wood acetylation fluid

#25
20170137364
2017-05-18

Processes for purifying acetic and hydrating anhydride

#26
20170113998
2017-04-27

Method for separating high-boiling carboxylic acid vinyl ester/carboxylic acid mixtures

#27
20170088502
2017-03-30

Method for producing carboxylic acid anhydride and method for producing carboxylic acid ester

#28
20160332949
2016-11-17

Synthesis of (meth) acrylic anhydride by transanhydrization

#29
20160122273
2016-05-05

Process for the preparation of halogenated carboxylic anhydrides

#30
20160016878
2016-01-21

Process for the co-production of acetic acid and acetic anhydride

#31
20150203433
2015-07-23

Synthesis of (meth)acrylic anhydride by transanhydrization

#32
20150191410
2015-07-09

Method for producing isononanoic acids from 2-ethyl hexanol

#33
20150141479
2015-05-21

Compositions and methods for the treatment of moderate to severe pain

#34
20140364618
2014-12-11

Method of making indeno-fused naphthol materials

#35
20140087039
2014-03-27

Method for producing sorbic anhydride and also use thereof as a preservative in foods

#36
20140066653
2014-03-06

Processes for purifying acetic anhydride

#37
20130197267
2013-08-01

Processes for preparing acetic anhydride

#38
20130072718
2013-03-21

High shear system and process for the production of acetic anhydride

#39
20120157696
2012-06-21

Method of making indeno-fused naphthol materials

#40
20120053366
2012-03-01

Process for producing carboxylic acid anhydrides

#41
20110319620
2011-12-29

Method for producing carboxylic anhydride and arylboronic acid compound

#42
20110137072
2011-06-09

Method for producing (meth)acrylic anhydride, method for storing (meth)acrylic anhydride, and method for producing (meth)acrylate

#43
20110124889
2011-05-26

Process for the oxidation of alcohol and/or aldehyde groups

#44
20110091360
2011-04-21

High shear system and process for the production of acetic anhydride

#45
20100317892
2010-12-16

Method for preparing (meth)acrylic anhydride

#46
20100311574
2010-12-09

Process to produce high surface area nanoparticle vanadium phosphorus oxide catalyst and product derives thereof

#47
20100291398
2010-11-18

Wood treated by impregnation with mixed anhydrides

#48
20100145098
2010-06-10

Process for producing carboxylic acid anhydrides

#49
20100069666
2010-03-18

IMPROVED METHOD FOR THE PRODUCTION OF UNSATURATED CARBOXYLIC ACID ANHYDRIDES

#50
20090264673
2009-10-22

Method for the continuous production of unsaturated carboxylic acid anhydrides

#51
20090247783
2009-10-01

CARBONYLATION PROCESS

#52
20090234161
2009-09-17

METHOD FOR THE PRODUCTION OF (METH)ACRYLIC ANHYDRIDE

#53
20090177007
2009-07-09

Process for producing carboxylic acid anhydrides

#54
20090156834
2009-06-18

PROCESS FOR MAKING 2,2-BIS (3,4-DICARBOXYPHENYL) HEXAFLUOROPROPANE

#55
20090118533
2009-05-07

Method for the continuous production of unsaturated carboxylic acid anhydrides

#56
20090012318
2009-01-08

Cage-shaped cyclobutanoic dianhydrides and process for production thereof

#57
20090005585
2009-01-01

High shear system and process for the production of acetic anhydride

#58
20080234512
2008-09-25

Integrated process for producing carbonylation acetic acid, acetic anhydride, or coproduction of each from a methyl acetate by-product stream

#59
20080221352
2008-09-11

Integrated process for producing carbonylation acetic acid, acetic anhydride, or coproduction of each from a methyl acetate by-product stream

#60
20070287862
2007-12-13

Production of acetic acid and mixtures of acetic acid and acetic anhydride

#61
20070197822
2007-08-23

Integrated process for producing carbonylation acetic acid, acetic anhydride, or coproduction of each from a methyl acetate by-product stream

#62
20070191625
2007-08-16

Integrated process for producing carbonylation acetic acid, acetic anhydride, or coproduction of each from a methyl acetate by-product stream

#63
20070185283
2007-08-09

Perdeuterated polyimides, their process of preparation and their use as materials which are transparent within the region from 2500 to 3500 cm

#64
20070185282
2007-08-09

Perdeuterated polyimides, their process of preparation and their use as materials which are transparent within the region from 2500 to 3500 cm-1

#65
20070021622
2007-01-25

Production method of highly pure pyromellitic dianhydride

#66
20060135791
2006-06-22

Method of purifying dianhydrides

#67
20060052631
2006-03-09

Flexible method for the joint production of (i) formic acid, (ii) a carboxylic acid comprising at least two carbon atoms and/or the derivatives thereof, and (iii) a carboxylic acid anhydride

#68
20060041162
2006-02-23

Acetic anhydride and acetate ester co-production

#69
20050245762
2005-11-03

Process for preparing R-(-)carnitine from S-(-)-chlorosuccinic acid or from a derivative thereof

#70
20050239973
2005-10-27

Perdeuterated polyiimides, their process of preparation and their use as materials which are transparent within the region from 2500 to 3500cm

#71
20050215820
2005-09-29

Aryl ethynyl phthalic acid derivative and method for producing the same

#72
20050163935
2005-07-28

Method for treating lignocellulosic materials, in particular wood and material obtained by this method

#73
20050065364
2005-03-24

Process for production of acetyl anhydrides and optionally acetic acid from methane and carbon dioxide

#74
20050059841
2005-03-17

Processes for the preparation of a carboxylic anhydride and use of the carboxylic anhydride as an acylation agent

#75
20050020856
2005-01-27

Process for production of acetyl anhydrides and optionally acetic acid from methane and carbon dioxide

#76
20050014974
2005-01-20

Process for the manufacture of isobutyric anhydride