DE1195736B - Process for improving the adipic acid yield in the work-up of mixtures of the catalytic oxygen oxidation of cyclohexane, cyclohexanone and / or cyclohexanol - Google Patents
Process for improving the adipic acid yield in the work-up of mixtures of the catalytic oxygen oxidation of cyclohexane, cyclohexanone and / or cyclohexanolInfo
- Publication number
- DE1195736B DE1195736B DES75404A DES0075404A DE1195736B DE 1195736 B DE1195736 B DE 1195736B DE S75404 A DES75404 A DE S75404A DE S0075404 A DES0075404 A DE S0075404A DE 1195736 B DE1195736 B DE 1195736B
- Authority
- DE
- Germany
- Prior art keywords
- acid
- adipic acid
- crystallization
- weight
- solvent
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- WNLRTRBMVRJNCN-UHFFFAOYSA-N adipic acid Chemical compound OC(=O)CCCCC(O)=O WNLRTRBMVRJNCN-UHFFFAOYSA-N 0.000 title claims description 58
- 239000001361 adipic acid Substances 0.000 title claims description 29
- 235000011037 adipic acid Nutrition 0.000 title claims description 29
- 238000000034 method Methods 0.000 title claims description 18
- 239000000203 mixture Substances 0.000 title claims description 18
- 230000003647 oxidation Effects 0.000 title claims description 16
- 238000007254 oxidation reaction Methods 0.000 title claims description 16
- JHIVVAPYMSGYDF-UHFFFAOYSA-N cyclohexanone Chemical compound O=C1CCCCC1 JHIVVAPYMSGYDF-UHFFFAOYSA-N 0.000 title claims description 14
- XDTMQSROBMDMFD-UHFFFAOYSA-N Cyclohexane Chemical compound C1CCCCC1 XDTMQSROBMDMFD-UHFFFAOYSA-N 0.000 title claims description 11
- HPXRVTGHNJAIIH-UHFFFAOYSA-N cyclohexanol Chemical compound OC1CCCCC1 HPXRVTGHNJAIIH-UHFFFAOYSA-N 0.000 title claims description 9
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims description 7
- 239000001301 oxygen Substances 0.000 title claims description 7
- 229910052760 oxygen Inorganic materials 0.000 title claims description 7
- 230000003197 catalytic effect Effects 0.000 title claims description 5
- 238000010626 work up procedure Methods 0.000 title description 2
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims description 36
- 239000002253 acid Substances 0.000 claims description 23
- 239000002904 solvent Substances 0.000 claims description 16
- 238000002425 crystallisation Methods 0.000 claims description 15
- 230000008025 crystallization Effects 0.000 claims description 15
- 239000012452 mother liquor Substances 0.000 claims description 8
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 7
- 238000001914 filtration Methods 0.000 claims description 7
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 6
- 239000002243 precursor Substances 0.000 claims description 6
- 235000014113 dietary fatty acids Nutrition 0.000 claims description 5
- 239000000194 fatty acid Substances 0.000 claims description 5
- 229930195729 fatty acid Natural products 0.000 claims description 5
- 150000004665 fatty acids Chemical class 0.000 claims description 5
- 239000011541 reaction mixture Substances 0.000 claims description 5
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims description 4
- JOXIMZWYDAKGHI-UHFFFAOYSA-N toluene-4-sulfonic acid Chemical compound CC1=CC=C(S(O)(=O)=O)C=C1 JOXIMZWYDAKGHI-UHFFFAOYSA-N 0.000 claims description 4
- 238000010306 acid treatment Methods 0.000 claims description 3
- 239000003054 catalyst Substances 0.000 claims description 3
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims description 2
- 230000009286 beneficial effect Effects 0.000 claims description 2
- 238000010992 reflux Methods 0.000 claims 4
- QQZOPKMRPOGIEB-UHFFFAOYSA-N 2-Oxohexane Chemical compound CCCCC(C)=O QQZOPKMRPOGIEB-UHFFFAOYSA-N 0.000 claims 2
- 238000009835 boiling Methods 0.000 claims 2
- 238000004821 distillation Methods 0.000 claims 2
- VLKZOEOYAKHREP-UHFFFAOYSA-N methyl pentane Natural products CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 claims 2
- LEVONNIFUFSRKZ-UHFFFAOYSA-N 3-(carboxymethyl)-2,2-dimethylcyclobutane-1-carboxylic acid Chemical compound CC1(C)C(CC(O)=O)CC1C(O)=O LEVONNIFUFSRKZ-UHFFFAOYSA-N 0.000 claims 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims 1
- VMHLLURERBWHNL-UHFFFAOYSA-M Sodium acetate Chemical compound [Na+].CC([O-])=O VMHLLURERBWHNL-UHFFFAOYSA-M 0.000 claims 1
- 240000008042 Zea mays Species 0.000 claims 1
- 235000005824 Zea mays ssp. parviglumis Nutrition 0.000 claims 1
- 235000002017 Zea mays subsp mays Nutrition 0.000 claims 1
- 150000001279 adipic acids Chemical class 0.000 claims 1
- 230000015572 biosynthetic process Effects 0.000 claims 1
- 150000001735 carboxylic acids Chemical class 0.000 claims 1
- 239000003795 chemical substances by application Substances 0.000 claims 1
- 239000012141 concentrate Substances 0.000 claims 1
- 229910052802 copper Inorganic materials 0.000 claims 1
- 239000010949 copper Substances 0.000 claims 1
- 235000005822 corn Nutrition 0.000 claims 1
- 150000002148 esters Chemical class 0.000 claims 1
- 239000012065 filter cake Substances 0.000 claims 1
- 239000000706 filtrate Substances 0.000 claims 1
- 229910052500 inorganic mineral Inorganic materials 0.000 claims 1
- 150000002576 ketones Chemical class 0.000 claims 1
- 150000002696 manganese Chemical class 0.000 claims 1
- 229910052753 mercury Inorganic materials 0.000 claims 1
- 239000011707 mineral Substances 0.000 claims 1
- GEMHFKXPOCTAIP-UHFFFAOYSA-N n,n-dimethyl-n'-phenylcarbamimidoyl chloride Chemical compound CN(C)C(Cl)=NC1=CC=CC=C1 GEMHFKXPOCTAIP-UHFFFAOYSA-N 0.000 claims 1
- 230000001590 oxidative effect Effects 0.000 claims 1
- 239000000047 product Substances 0.000 claims 1
- 238000011084 recovery Methods 0.000 claims 1
- 229920006395 saturated elastomer Polymers 0.000 claims 1
- 238000000926 separation method Methods 0.000 claims 1
- 239000001632 sodium acetate Substances 0.000 claims 1
- 235000017281 sodium acetate Nutrition 0.000 claims 1
- 238000005292 vacuum distillation Methods 0.000 claims 1
- 241001292396 Cirrhitidae Species 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000006213 oxygenation reaction Methods 0.000 description 1
- 150000004671 saturated fatty acids Chemical class 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C55/00—Saturated compounds having more than one carboxyl group bound to acyclic carbon atoms
- C07C55/02—Dicarboxylic acids
- C07C55/14—Adipic acid
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C45/00—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds
- C07C45/27—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by oxidation
- C07C45/32—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by oxidation with molecular oxygen
- C07C45/33—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by oxidation with molecular oxygen of CHx-moieties
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C49/00—Ketones; Ketenes; Dimeric ketenes; Ketonic chelates
- C07C49/385—Saturated compounds containing a keto group being part of a ring
- C07C49/403—Saturated compounds containing a keto group being part of a ring of a six-membered ring
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C51/00—Preparation of carboxylic acids or their salts, halides or anhydrides
- C07C51/16—Preparation of carboxylic acids or their salts, halides or anhydrides by oxidation
- C07C51/31—Preparation of carboxylic acids or their salts, halides or anhydrides by oxidation of cyclic compounds with ring-splitting
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C51/00—Preparation of carboxylic acids or their salts, halides or anhydrides
- C07C51/16—Preparation of carboxylic acids or their salts, halides or anhydrides by oxidation
- C07C51/31—Preparation of carboxylic acids or their salts, halides or anhydrides by oxidation of cyclic compounds with ring-splitting
- C07C51/313—Preparation of carboxylic acids or their salts, halides or anhydrides by oxidation of cyclic compounds with ring-splitting with molecular oxygen
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C51/00—Preparation of carboxylic acids or their salts, halides or anhydrides
- C07C51/42—Separation; Purification; Stabilisation; Use of additives
- C07C51/43—Separation; Purification; Stabilisation; Use of additives by change of the physical state, e.g. crystallisation
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C55/00—Saturated compounds having more than one carboxyl group bound to acyclic carbon atoms
- C07C55/02—Dicarboxylic acids
- C07C55/21—Dicarboxylic acids containing twelve carbon atoms
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C2601/00—Systems containing only non-condensed rings
- C07C2601/12—Systems containing only non-condensed rings with a six-membered ring
- C07C2601/14—The ring being saturated
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Crystallography & Structural Chemistry (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Description
BUNDESREPUBLIK DEUTSCHLANDFEDERAL REPUBLIC OF GERMANY
DEUTSCHESGERMAN
PATENTAMTPATENT OFFICE
AUSLEGESCHRIFTEDITORIAL
Int. α.:Int. α .:
C07cC07c
Deutsche Kl.: 12 ο-11German class: 12 ο-11
Nummer: 1195 736Number: 1195 736
Aktenzeichen: S 75404IV b/12 οFile number: S 75404IV b / 12 ο
Anmeldetag: 22. August 1961 Filing date: August 22, 1961
Auslegetag: 1. Juli 1965Opening day: July 1, 1965
Adipinsäure ist eine Substanz von großer technischer Bedeutung. Nach einem vorteilhaften Verfahren wird die Säure in hoher Ausbeute durch Oxydation von Cyclohexan, Cyclohexanon und bzw. oder Cyclohexanol (im folgenden kurz als »Adipinsäurevorläufer« bezeichnet) mit Luft oder einem anderen Sauerstoff enthaltenden Gas in Gegenwart eines Lösungsmittels, vorzugsweise Essigsäure und eines Katalysators oxydiert.Adipic acid is a substance of great technical importance. According to an advantageous process the acid is produced in high yield by oxidation of cyclohexane, cyclohexanone and resp. or cyclohexanol (hereinafter referred to as "adipic acid precursor" for short) with air or a other oxygen-containing gas in the presence of a solvent, preferably acetic acid and oxidized by a catalyst.
Das bei der Oxydation von Adipinsäurevorläufern gebildete Reaktionsgemisch wird zur Isolierung der gebildeten Adipinsäure in hoher Ausbeute und Reinheit in verschiedenen Stufen aufgearbeitet, z. B. durch Kristallisation und Filtration. Die bisher angewandten Arbeitsweisen sind jedoch zur Erzielung höchster Ausbeuten an reiner Adipinsäure noch nicht voll befriedigend. Das erfindungsgemäße Verfahren zur Verbesserung der Ausbeute an Adipinsäure bei der Aufarbeitung von Gemischen der katalytischen Sauerstoffoxydation von Cyclohexan, Cyclohexanon und bzw. oder Cyclohexanol in Gegenwart einer niedermolekularen gesättigten Fettsäure, insbesondere Essigsäure als Lösungsmittel, ist dadurch gekennzeichnet, daß man diese Gemische oder deren Kristallisationsmutterlaugen mit einer starken Säure behandelt und die Adipinsäure anschließend durch Kristallisation gewinnt.The reaction mixture formed in the oxidation of adipic acid precursors is used to isolate the Adipic acid formed worked up in high yield and purity in various stages, e.g. B. by crystallization and filtration. However, the working methods used so far are to be achieved highest yields of pure adipic acid not yet fully satisfactory. The inventive method to improve the yield of adipic acid when working up mixtures of the catalytic Oxygen oxidation of cyclohexane, cyclohexanone and / or cyclohexanol in the presence of a Low molecular weight saturated fatty acid, especially acetic acid as a solvent, is characterized by treating these mixtures or their crystallization mother liquors with a strong acid and the adipic acid is then recovered by crystallization.
Nach einer Ausführungsform des erfindungsgemäßen Verfahrens wird das Reaktionsgemisch, das durch katalytisch^ Sauerstoffoxydation von Adipinsäurevorläufern in Gegenwart einer niedermolekularen Fettsäure als Lösungsmittel erhalten wurde, direkt mit der starken Säure behandelt. Nach dem Einengen des Reaktionsgemischs durch Abdestillieren des Lösungsmittels wird die Adipinsäure durch Kristallisation und Filtration isoliert. Die Entfernung des Lösungsmittels kann auch vor der Behandlung mit der starken Säure erfolgen. Verbesserte Adipinsäureausbeuten werden bei dieser Ausführungsform nur dann erhalten, wenn das Oxydationsgemisch sowohl eingeengt als auch der Behandlung mit der starken Säure unterworfen wird. Durch die Behandlung des Gemischs mit starker Säure allein kann hier die Ausbeute an Adipinsäure nicht gesteigert werden.According to one embodiment of the invention Process is the reaction mixture, which by catalytic ^ oxygenation of adipic acid precursors was obtained in the presence of a low molecular weight fatty acid as a solvent, treated directly with the strong acid. After the reaction mixture has been concentrated by distilling off the adipic acid is isolated from the solvent by crystallization and filtration. The distance the solvent can also be done before the treatment with the strong acid. Improved adipic acid yields are only obtained in this embodiment if the oxidation mixture both concentrated as well as being subjected to the treatment with the strong acid. Through the treatment the mixture with strong acid alone cannot increase the yield of adipic acid here.
Bei einer weiteren Ausführungsform des erfindungsgemäßen
Verfahrens wird das bei der Oxydation von Adipinsäurevorläufern erhaltene Reaktionsgemisch zunächst einer Kristallisation und Filtration
unterworfen, um einen ersten Anteil an Adipinsäure abzutrennen. Dann wird die hierbei erhaltene Mutterlauge
der Behandlung mit der starken Säure unterworfen. Anschließend kann die so behandelte Mutter-Verfahren
zur Verbesserung der Adipinsäureausbeute bei der Aufarbeitung von Gemischen der katalytischen Sauerstoffoxydation von Cyclohexan,
Cyclohexanon und bzw. oder
CyclohexanolIn a further embodiment of the process according to the invention, the reaction mixture obtained in the oxidation of adipic acid precursors is first subjected to crystallization and filtration in order to separate off a first portion of adipic acid. The mother liquor obtained in this way is then subjected to the treatment with the strong acid. The mother process thus treated can then be used to improve the adipic acid yield in the work-up of mixtures of the catalytic oxygen oxidation of cyclohexane, cyclohexanone and / or
Cyclohexanol
Anmelder:Applicant:
Halcon International, Inc.,Halcon International, Inc.,
New York, N. Y. (V. St. A.)New York, N.Y. (V. St. A.)
Vertreter:Representative:
Dipl.-Chem. Dr. I. Maas, Patentanwalt,Dipl.-Chem. Dr. I. Maas, patent attorney,
München 23, Ungererstr. 25Munich 23, Ungererstr. 25th
Als Erfinder benannt:Named as inventor:
Joseph L. Russell, Ridgewood, N. J.;Joseph L. Russell, Ridgewood, N. J .;
Charles N. Winnick, Teaneck, N. J. (V. St. A.)Charles N. Winnick, Teaneck, N. J. (V. St. A.)
Beanspruchte Priorität:Claimed priority:
V. St. v. Amerika vom 22. August 1960 (50 868)V. St. v. America of August 22, 1960 (50 868)
lauge zur Abtrennung einer weiteren Menge an Adipinsäure zur Kristallisation gebracht und filtriert werden. Es ist jedoch zweckmäßiger, die mit der starken Säure behandelte Mutterlauge vor der Kristallisation und dem Filtrieren durch Entfernung von Lösungsmittel einzuengen, wenn die höchstmögliche Ausbeute an Adipinsäure erzielt werden soll. Die Mutterlauge kann auch vor der Behandlung mit der starken Säure eingeengt werden, wenn dies auch weniger vorteilhaft ist.Lye brought to the separation of a further amount of adipic acid to crystallize and filtered will. However, it is more expedient to use the mother liquor treated with the strong acid before crystallization and filtering by removing solvent, if the highest possible Yield of adipic acid should be achieved. The mother liquor can also be used before treatment with the strong acid, although this is less beneficial.
Nach einer weiteren Ausführungsform des erfindungsgemäßen Verfahrens können Gemische, die bei der Oxydation von Adipinsäurevorläufern mit Sauerstoff in einem anderen Lösungsmittel als einer niedermolekularen Fettsäure erhalten wurden, von diesem Lösungsmittel befreit, anschließend in einer niedermolekularen Fettsäure gelöst und in der oben beschriebenen Weise behandelt werden, um so höhere Ausbeuten an Adipinsäure zu erzielen.According to a further embodiment of the process according to the invention, mixtures that contain the oxidation of adipic acid precursors with oxygen in a solvent other than a low molecular weight one Fatty acid obtained, freed from this solvent, then in a low molecular weight Fatty acid dissolved and treated in the manner described above, the higher the higher To achieve yields of adipic acid.
Zur erfindungsgemäßen Säurebehandlung werden geringe Mengen einer starken Säure, wie Schwefelsäure, Salzsäure, Phosphorsäure oder p-Toluolsulf onsäure, verwendet. Im allgemeinen liegt die Säure-For the acid treatment according to the invention, small amounts of a strong acid, such as sulfuric acid, Hydrochloric acid, phosphoric acid or p-toluenesulfonic acid, used. In general, the acidity
509 598/419509 598/419
Claims (1)
oxydiert. Hierbei werden lösliche Kupfer- oderat a temperature of around 70 to 80 ° C represents a further significant improvement.
oxidized. Soluble copper or
(40 mm Hg) abdestilliert. Der Destillationsrückstandacetic acid used under reduced pressure 60 claims
(40 mm Hg) distilled off. The still residue
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US1195736XA | 1960-08-22 | 1960-08-22 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE1195736B true DE1195736B (en) | 1965-07-01 |
Family
ID=22385125
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DES75404A Pending DE1195736B (en) | 1960-08-22 | 1961-08-22 | Process for improving the adipic acid yield in the work-up of mixtures of the catalytic oxygen oxidation of cyclohexane, cyclohexanone and / or cyclohexanol |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE1195736B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0212529A1 (en) * | 1985-08-10 | 1987-03-04 | Hermann Dr. Dipl.-Chem. Menk | Process to prevent the darkening occurring during their further treatment of the by-products obtained from the preparation of adipic acid |
-
1961
- 1961-08-22 DE DES75404A patent/DE1195736B/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0212529A1 (en) * | 1985-08-10 | 1987-03-04 | Hermann Dr. Dipl.-Chem. Menk | Process to prevent the darkening occurring during their further treatment of the by-products obtained from the preparation of adipic acid |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| DE3226232A1 (en) | INCLUDING COMPOUND OF EICOSAPENTAIC ACID OR DOCOSAHEXAIC ACID WITH CYCLODEXTRIN AND METHOD FOR THE PRODUCTION THEREOF | |
| DE10215943B4 (en) | Processing of residues in the production of carboxylic acids | |
| DE1593968C3 (en) | Process for the production of hydroquinone and catechol | |
| DE2049113C3 (en) | ||
| DE2345355C2 (en) | Process for stabilizing dihydroperoxides of dialkyl-substituted aromatic hydrocarbons | |
| DE1195736B (en) | Process for improving the adipic acid yield in the work-up of mixtures of the catalytic oxygen oxidation of cyclohexane, cyclohexanone and / or cyclohexanol | |
| DE1256210B (en) | Process for purifying terephthalic acid | |
| DE2111196A1 (en) | Process for the production of adipic acid | |
| DE1959621C3 (en) | Process for the production of adipic acid from 6-hydroperoxyhexanoic acid | |
| DE2751363C2 (en) | Process for the purification of p-toluic acid, which has been obtained by oxidizing p-xylene with atmospheric oxygen in the presence of heavy metal salt catalysts | |
| DE1041949B (en) | Process for the preparation of solutions of alkali acrylates by oxidation of acrolein | |
| DE962527C (en) | Process for the preparation of oxyhydroperoxides | |
| DE2759027C2 (en) | Process for the production of terephthalic acid | |
| DE1951250A1 (en) | Process for the production of epsilon-hydroxycaproic acid | |
| DE1903571C (en) | Process for the purification of decanedicarboxylic acid | |
| DE2027536C (en) | ||
| DE1951250C (en) | ||
| DE1155121B (en) | Process for the production of cyclohexanol and cyclohexanone by oxidation of cyclohexane | |
| AT230866B (en) | Process for the preparation of mixtures of α, α, γ - and α, γ, γ - trimethyladipic acid | |
| DE2048575C3 (en) | Process for the production of e-caprolactam from 6-hydroperoxyhexanoic acid | |
| AT244324B (en) | Process for the preparation of cycloalkanone oximes | |
| DE1002339C2 (en) | Process for working up the reaction mixture formed in the oxidation of technical grade trans-decahydronaphthalene | |
| DE619348C (en) | Process for the production of pure diacetyl from wood vinegar or other mixtures containing diacetyl | |
| DE2059042A1 (en) | Process for the production of carboxylic acids | |
| DE3219662A1 (en) | Process for the regeneration of metal-laden liquid organic cation exchangers |