ClassID:

93024

C07C253/34 - CPC Classification

Classification description:

Preparation of carboxylic acid nitriles; Separation; Purification; Stabilisation; Use of additives Separation; Purification

Recent Application in this class:
#1
20260109666
2026-04-23

ACETONITRILE COMPOSITIONS AND METHODS OF MAKING THE SAME

#2
20260055053
2026-02-26

METHOD FOR THE PURIFICATION OF ETHYLENE CYANOHYDRIN

#3
20250374817
2025-12-04

METHOD FOR REFINING ORGANIC MATERIAL

#4
20250361203
2025-11-27

PROCESSES OF MAKING 3-FLUORO-5-(((1S,2AR)-1,3,3,4,4 PENTAFLUORO-2A-HYDROXY-2,2A,3,4-TETRAHYDRO-1H-CYCLOPENTA[CD]INDEN-7-YL)OXY)BENZONITRILE AND POLYMORPHS THEREOF

#5
20250313526
2025-10-09

PYRETHROID COMPOUND CONTAINING DOUBLE BONDS AND CYANO GROUPS, SYNTHESIS METHOD THEREFOR, AND APPLICATION THEREOF

#6
20250179009
2025-06-05

ACETONITRILE RECOVERY PROCESS

#7
20250091985
2025-03-20

IMPROVED PROCESS OPTIMIZATION IN PRODUCTION OF AN INSECTICIDAL SUBSTANCE IN INDUSTRIAL SCALE

#8
20250059134
2025-02-20

MEROCYANINE CRYSTALLIZATION PROCESS

#9
20250059133
2025-02-20

PROCESS FOR RECOVERING AN ACETONITRILE

#10
20240360006
2024-10-31

Method for Purifying of Waste Water

#11
20240199536
2024-06-20

METHOD OF PREPARING PHTHALONITRILE-BASED COMPOUND

#12
20240150278
2024-05-09

PROCESS FOR PURIFYING AMINOCAPRONITRILE

#13
20240132444
2024-04-25

MANUFACTURE OF NITRILE COMPOUNDS

#14
20240124386
2024-04-18

PROCESS FOR PRODUCING HEXAMETHYLENEDIAMINE FROM CAPROLACTAM

#15
20240092729
2024-03-21

METHOD FOR PURIFYING KEY INTERMEDIATES OF CITALOPRAM

#16
20240050897
2024-02-15

Method for Concentrating Raw Material Solution, and System for Concentrating Raw Material Solution

#17
20240034715
2024-02-01

A METHOD FOR THE PURIFICATION OF ETHYLENE CYANOHYDRIN

#18
20230416192
2023-12-28

TRICYANOHEXANE PURIFICATION METHODS

#19
20230331664
2023-10-19

METHOD FOR THE HYDROSILYLATION OF AN OLEFINIC NITRILE AND A HYDRIDOSILANE

#20
20230257341
2023-08-17

CIS-PARA-SUBSTITUTED CYCLOHEXYLAMINONITRILE SALT, PREPARATION METHOD THEREFOR AND USE THEREOF, AND METHOD FOR PREPARING PESTICIDE USING SAME

#21
20230257340
2023-08-17

ACETONITRILE PURIFICATION PROCESS FOR ULTRAHIGH PERFORMANCE LIQUID CHROMATOGRAPHY-MASS SPECTROMETER

#22
20230219884
2023-07-13

PREPARATION METHOD OF ACRYLONITRILE DIMER

#23
20230192600
2023-06-22

ACETONITRILE SEPARATION PROCESS

#24
20230130823
2023-04-27

PROCESS FOR THE PRODUCTION OF ANTITUMOUR PHARMACEUTICAL COMPOSITIONS USING PUSH-PULL BUTADIENES, COMPOUNDS AND USES THEREOF

#25
20230115881
2023-04-13

PROCESSES OF MAKING 3-FLUORO-5-(((1S,2aR)-1,3,3,4,4-PENTAFLUORO-2a-HYDROXY-2,2a,3,4-TETRAHYDRO-1H-CYCLOPENTA[CD]INDEN-7-YL)OXY)-BENZONITRILE AND POLYMORPHS THEREOF

#26
20230111802
2023-04-13

METHOD FOR PRODUCING PURIFIED PHTHALONITRILE AND METHOD FOR PURIFYING PHTHALONITRILE

#27
20230096729
2023-03-30

METHOD FOR PREPARING PHTHALONITRILE-BASED COMPOUND

#28
20230073691
2023-03-09

Acetonitrile purification process for ultrahigh performance liquid chromatography-mass spectrometer

#29
20230057964
2023-02-23

Method for preparing acrylonitrile dimer

#30
20230047439
2023-02-16

IMPURITY FORMATION REDUCTION DURING PRODUCT REFINING

#31
20220348536
2022-11-03

RECOVERY METHOD AND RECOVERY APPARATUS OF NITRILE-BASED MONOMER

#32
20220306571
2022-09-29

METHOD OF PRODUCING ACRYLONITRILE DIMER

#33
20220298104
2022-09-22

Method of preparing acrylonitrile dimer

#34
20220251030
2022-08-11

ACETONITRILE SEPARATION PROCESS

#35
20220204440
2022-06-30

METHOD FOR PREPARING ACRYLONITRILE DIMER

#36
20220177420
2022-06-09

Preparation method of 1-(4-aminophenyl)cyclopentanecarbonitrile

#37
20220073451
2022-03-10

Acetonitrile separation process

#38
20220064108
2022-03-03

Process for recovering acetonitrile

#39
20220033353
2022-02-03

PROCESS FOR PREPARING CYANOACETATES

#40
20220033352
2022-02-03

SYNTHETIC METHOD FOR THE PREPARATION OF AN ALKOXYMETHYLENE-BENZOYLACETONITRILE

#41
20220033350
2022-02-03

PROCESS FOR PREPARING CYANOACETATES

#42
20220033349
2022-02-03

Process for preparing cyanoacetates

#43
20210323912
2021-10-21

Merocyanine crystallization process

#44
20210269393
2021-09-02

Method for preparing C-H acidic (meth)acrylates

#45
20210198187
2021-07-01

PROCESS FOR SEPARATING TRICYANOHEXANE

#46
20210198186
2021-07-01

Tricyanohexane purification methods

#47
20210198185
2021-07-01

PROCESS FOR RECOVERING ADIPONITRILE

#48
20210093995
2021-04-01

Method and apparatus for recycling heptafluoroisobutyronitrile

#49
20200399207
2020-12-24

Method for purifying nitrile solvent

#50
20200369602
2020-11-26

Tricyanohexane purification methods

#51
20200247745
2020-08-06

PREPARATION OF 2-CYCLOHEXYLIDEN-2-PHENYL ACETONITRILE AND ODORIFEROUS STRUCTURAL ANALOGS THEREOF

#52
20200239409
2020-07-30

Method of High-Pressure Purification of [F-18]FEONM

#53
20200157044
2020-05-21

Process for recovering acetonitrile from acrylonitrile waste streams

#54
20200010428
2020-01-09

Process for preparing (cyclopentyl[d]pyrimidin-4-yl)piperazine compounds

#55
20200009531
2020-01-09

Porous chiral materials and uses thereof

#56
20190375721
2019-12-12

Process for the preparation of fluoroalkylnitriles and the corresponding fluoroalkyltetrazoles

#57
20190322616
2019-10-24

Methods for multi-dose synthesis of [F-18]FDDNP for clinical settings

#58
20190299122
2019-10-03

Quench column aftercooler

#59
20190292200
2019-09-26

Method for preparing 2-(cyclohexenylidene) malonic acid derivatives and uses thereof

#60
20190185418
2019-06-20

Method for resolution of citalopram intermediate 5-cyano diol

#61
20190135736
2019-05-09

Process for reducing CPI in a dinitrile stream

#62
20190064785
2019-02-28

Method and system for transporting inventory items

#63
20190047945
2019-02-14

Purifying method, production method, and distillation apparatus for acrylonitrile

#64
20190031581
2019-01-31

Method for separating materials by means of an extractive distillation process

#65
20180361319
2018-12-20

Method for improved reactive monomer production with membrane filtration

#66
20180354893
2018-12-13

Method and system for transporting inventory items

#67
20180305303
2018-10-25

Method for preparing acrolein cyanohydrins

#68
20180244607
2018-08-30

Inhibiting CPI formation from adiponitrile

#69
20180208548
2018-07-26

High purity HCN from acrylonitrile co-production

#70
20180194719
2018-07-12

Crystal forms of verapamil hydrochloride

#71
20180127355
2018-05-10

Methods for multi-dose synthesis of [F-18]FDDNP for clinical settings

#72
20180093945
2018-04-05

Purification method of aldehyde compound

#73
20180093944
2018-04-05

Purification method of aldehyde compound

#74
20170355666
2017-12-14

POLYMORPHS OF CDDO ETHYL ESTER AND USES THEREOF

#75
20170334833
2017-11-23

Crystals of alanine N-acetic acid precursors, process to prepare them and their use

#76
20170305841
2017-10-26

Crystal forms of verapamil hydrochloride

#77
20170247338
2017-08-31

Process for preparing (cyclopentyl[d]pyrimidin-4-yl)piperazine compounds

#78
20170240505
2017-08-24

Method for resolution of citalopram intermediate 5-cyano diol

#79
20170217873
2017-08-03

Method and apparatus for producing dicyanobenzene

#80
20170197909
2017-07-13

Enhanced extraction of impurities from mixture comprising nitriles

#81
20170152217
2017-06-01

Fine purification of isophoronenitrile by melt crystallization

#82
20170152211
2017-06-01

Integrated process for nitrile manufacture with enhanced liquid-liquid extraction

#83
20170095754
2017-04-06

Polyol-induced extraction of water from organic liquids

#84
20160376227
2016-12-29

Method for purifying adipodinitrile (ADN)

#85
20160272580
2016-09-22

Process for removing cations from an isophoronenitrile product mixture

#86
20160257644
2016-09-08

ACRYLONITRILE MANUFACTURE

#87
20160168081
2016-06-16

Separating a solvent from a nickel catalyst by distillation

#88
20160115120
2016-04-28

METHOD FOR THE CONTROLLED HYDROFORMYLATION AND ISOMERIZATION OF A NITRILE/ESTER/OMEGA UNSATURATED FATTY ACID

#89
20150314279
2015-11-05

Process for producing pentenenitriles

#90
20150299107
2015-10-22

SELECTIVE EXTRACTION OF AN OMEGA-FUNCTIONALIZED ACID AFTER OXIDATIVE CLEAVAGE OF AN UNSATURATED FATTY ACID AND DERIVATIVES

#91
20150291513
2015-10-15

Purification method of aldehyde compound

#92
20150239828
2015-08-27

Methods and systems for processing an acetonitrile waste stream

#93
20150218123
2015-08-06

Preparation method for optically active bicyclic gamma-amino acid compound

#94
20140378695
2014-12-25

Process for the manufacture of methyl limonitrile

#95
20140350302
2014-11-27

()-6-(dimethylamino)-4,4-diphenylheptan-3-one

#96
20140315997
2014-10-23

Polymorphs of CDDO ethyl ester and uses thereof

#97
20140263050
2014-09-18

Polyol-induced extraction of water from organic liquids

#98
20130331598
2013-12-12

2-cyanoacrylate-purifying method

#99
20130310594
2013-11-21

Purification of 1,1-disubstituted ethylene

#100
20130274501
2013-10-17

Process for preparing bicalutamide

#101
20130197270
2013-08-01

Method for producing trans-1,4-bis(aminomethyl) cyclohexane

#102
20130041106
2013-02-14

Chemoselective enrichment for compound isolation

#103
20120310003
2012-12-06

METHOD FOR PRODUCING CYANOALKENYLCYCLOPROPANECARBOXYLIC ACID SALT

#104
20120184769
2012-07-19

METHOD FOR ISOLATING METHYLGLYCINENITRILE-N,N-DIACETONITRILE

#105
20120073954
2012-03-29

RECOVERY OF ACETONITRILE FROM A WASTE STREAM

#106
20120029229
2012-02-02

Method for producing high purity terminal olefin compound

#107
20120015443
2012-01-19

Chiral selectors and stationary phases for separating enantiomer mixtures

#108
20110288326
2011-11-24

Process for isomerizing CIS-2-pentenenitrile to 3-pentenenitriles

#109
20110237822
2011-09-29

Process for preparation of valsartan intermediate

#110
20110230666
2011-09-22

PROCESS FOR THE SEPARATION OF ENANTIOMERICALLY PURE COMPOUNDS

#111
20110166377
2011-07-07

Method for the separation of pentenenitrile isomers

#112
20110124901
2011-05-26

High-yield production of organic nitriles

#113
20110065937
2011-03-17

Method for the separation of intermediates which may be used for the preparation of escitalopram

#114
20110060449
2011-03-10

System and method for transporting inventory items

#115
20110060155
2011-03-10

Process for preparing and method of purifying alkali metal and alkaline earth metal tricyanomethanides

#116
20100256410
2010-10-07

Method for recovering (meth)acrylonitrile

#117
20090326062
2009-12-31

PROCESS FOR PREPARING ENTACAPONE SUBSTANTIALLY FREE OF Z-ISOMER, SYNTHESIS INTERMEDIATES THEREOF AND A NEW CRYSTALLINE FORM

#118
20090299087
2009-12-03

Process for manufacturing unsaturated mononitriles to improve on-stream time and reduce fouling

#119
20090270645
2009-10-29

METHOD FOR THE SEPARATION OF NICKEL(0) COMPLEXES AND PHOSPHOROUS-CONTAINING LIGANDS FROM NITRILE MIXTURES

#120
20090229352
2009-09-17

Chiral selectors and stationary phases for separating enantiomer mixtures

#121
20090223804
2009-09-10

Process to C-manufacture acrylonitrile and hydrogen cyanide

#122
20090118517
2009-05-07

Purification process for anastrozole intermediate

#123
20090090894
2009-04-09

SEPARATION AND EXTRACTION SYSTEM

#124
20090069582
2009-03-12

Method for manufacture of escitalopram

#125
20090012176
2009-01-08

Process for manufacturing entacapone

#126
20080319226
2008-12-25

Process For the Preparation of Highly Pure (E) N,N-Diethyl-2-Cyano-3-(3,4-Dihydroxy-5-Nitro Phenyl) Acrylamide (Entacapone)

#127
20080319219
2008-12-25

Process for improving adiponitrile quality

#128
20080306296
2008-12-11

Process for the resolution of racemic verapamil

#129
20080281119
2008-11-13

Separation of Nickel(0) Complexes and Phosphorus-Containing Ligands from Nitrile Mixtures

#130
20080255367
2008-10-16

Process for the preparation and isolation of the individual stereoisomers of 1-amino, 3-substituted phenylcyclopentane-carboxylates

#131
20080242885
2008-10-02

Method for hydrocyanation

#132
20080227998
2008-09-18

Method for producing 3-pentenenitrile

#133
20080194858
2008-08-14

Method for isolating methyl glycine nitrile-N,N-diacetonitriles from an aqueous crude mixture

#134
20080073201
2008-03-27

Acetonitrile Recycling Process

#135
20070293978
2007-12-20

System and method for transporting inventory items

#136
20070265462
2007-11-15

Method for producing amino- or hydroxybenzonitriles

#137
20070260086
2007-11-08

Process for the preparation of dinitriles

#138
20070190624
2007-08-16

Method for the separation of intermediates which may be used for the preparation of escitalopram

#139
20070155979
2007-07-05

Process for the hydrocyanation of unsaturated compounds

#140
20070135653
2007-06-14

Process for removal of acrolein from acrylonitrile product streams

#141
20070129561
2007-06-07

Method for the separation of intermediates which may be used for the preparation of escitalopram

#142
20070112215
2007-05-17

Method for the separation of pentenenitrile isomers

#143
20070037999
2007-02-15

Method for isolating a homogeneous catalyst containing rhodium

#144
20070032660
2007-02-08

Purification process for Anastrozole intermediate

#145
20070027335
2007-02-01

Method for producing purified 2-cyanoacrylate

#146
20060264651
2006-11-23

Method for hydrocyanating an olefinically unsaturated compound

#147
20060175189
2006-08-10

Method of producing and separating dinitrile compounds

#148
20060167301
2006-07-27

Process for producing an aralkyl compound, a dehalogenation method of an aralkyl halide compound and a method for recovering an aralkyl compound

#149
20060149093
2006-07-06

Process for saparating a hydroxybenzonitrile-type compound

#150
20060128982
2006-06-15

Process for preparing (S)- alpha-cyano-3-phenoxybenzyl-(S)-2-(4-chlorophenyl)-isovalerate

#151
20060100457
2006-05-11

Production process of gamma-cyhalothrin

#152
20060088461
2006-04-27

Process for recovery and recycle of ammonia from a vapor stream

#153
20060058555
2006-03-16

Separation of 6-aminocapronitrile and hexamethylenediamine from a mixture comprising hexamethylenediamine, 6-aminocapronitrile and tetrahydroazepine

#154
20060058545
2006-03-16

Separation of 6-aminocapronitrile and hexamethylenediamine from a mixture comprising hexamethylenediamine, 6-aminocapronitrile and tetrahydroazepine

#155
20060030726
2006-02-09

Purification decolorization treatment for fatty nitriles

#156
20060020140
2006-01-26

Process for the preparation of racemic citalopram diol and/or - or -citalopram diols and the use of such diols for the preparation of racemic citalopram, -citalopram and/or -citalopram

#157
20050222449
2005-10-06

Method for reducing the content of an unsaturated amine in a mixture containing an amino nitrile, a diamine, a dinitrile or mixtures thereof

#158
20050187401
2005-08-25

Process for the purification of olefinically unsaturated nitriles

#159
20050182271
2005-08-18

Continuous processes and apparatus for forming cyanoacetate and cyanoacrylate

#160
20050154224
2005-07-14

Continuous process for the cyanation of hydrogenated β-ketoesters

#161
20050124075
2005-06-09

Method for the measurement of the pressure in a gas phase from rectification and/or absorption columns comprising (meth)acrylic acid the esters and/or nitriles thereof

#162
20050107453
2005-05-19

Resolution of 3-amino alkylnitriles

#163
20050079988
2005-04-14

Deodorization of cationic acetonitrile derivatives

#164
15662452
2018-08-28

Method of fabricating [F-18]FEONM precursor