Patents-Review.com
ClassID:

91810 ⎘

C07C51/573 - CPC Classification

Classification description:

Preparation of carboxylic acids or their salts, halides or anhydrides; Preparation of carboxylic acid anhydrides Separation; Purification; Stabilisation; Use of additives

Recent Application in this class:
#1
20250115542
2025-04-10

Synthesis and purification of CBDA

 #2
20220371983
2022-11-24

INTEGRATED PROCESS FOR GENERATING ACID ANHYDRIDES

 #3
20220356142
2022-11-10

PROCESS FOR DISTILLATIVE PURIFICATION OF UNSATURATED CARBOXYLIC ANHYDRIDES

 #4
20210299591
2021-09-30

Methods and systems for separating compounds

 #5
20210205732
2021-07-08

Method for chemical separation of cannabinoids

 #6
20210146317
2021-05-20

Process for continuous dissolution of a solid in a reaction medium

 #7
20210139403
2021-05-13

Process for the preparation of halogenated carboxylic anhydrides

 #8
20200223778
2020-07-16

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

 #9
20170327450
2017-11-16

Process for the manufacture of carboxylic anhydride

 #10
20170157793
2017-06-08

Recovery of wood acetylation fluid

 #11
20170113998
2017-04-27

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

 #12
20160332949
2016-11-17

Synthesis of (meth) acrylic anhydride by transanhydrization

 #13
20160221908
2016-08-04

Method for preparing levulinic acid using solid acid catalyst in presence of ethylene glycol-based compound solvent derived from biomass

 #14
20160122273
2016-05-05

Process for the preparation of halogenated carboxylic anhydrides

 #15
20160016878
2016-01-21

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

 #16
20150203433
2015-07-23

Synthesis of (meth)acrylic anhydride by transanhydrization

 #17
20150014150
2015-01-15

Process for Energy Recovery in Purifying Carboxylic Anhydride for Manufacturing Cellulose Esters

 #18
20140187812
2014-07-03

Systems and methods for processing variable acetyl streams

 #19
20140066653
2014-03-06

Processes for purifying acetic anhydride

 #20
20140005435
2014-01-02

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

 #21
20130197267
2013-08-01

Processes for preparing acetic anhydride

 #22
20120000764
2012-01-05

Method and system for purifying monomers

 #23
20110137072
2011-06-09

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

 #24
20110021789
2011-01-27

Process for separating off fumaric acid and other minor components during the production of maleic anhydride

 #25
20100317892
2010-12-16

Method for preparing (meth)acrylic anhydride

 #26
20100113805
2010-05-06

Process for obtaining maleic anhydride by distillation

 #27
20100069666
2010-03-18

IMPROVED METHOD FOR THE PRODUCTION OF UNSATURATED CARBOXYLIC ACID ANHYDRIDES

 #28
20090234161
2009-09-17

METHOD FOR THE PRODUCTION OF (METH)ACRYLIC ANHYDRIDE

 #29
20090166176
2009-07-02

Method for purifying polymerizable compounds

 #30
20090143601
2009-06-04

METHOD FOR PREVENTING FUMARIC ACID DEPOSITS IN THE PRODUCTION OF MALEIC ACID ANHYDRIDE

 #31
20080230481
2008-09-25

Process for the removal of catalytic metals and promoter metals from carbonylation process streams

 #32
20080207925
2008-08-28

Method for producing phthalic anhydride that conforms to specifications

 #33
20070073035
2007-03-29

Method for making polyetherimides

 #34
20060135791
2006-06-22

Method of purifying dianhydrides