WO1995014665A1 - Verfahren zur herstellung von caprolactam - Google Patents
Verfahren zur herstellung von caprolactam Download PDFInfo
- Publication number
- WO1995014665A1 WO1995014665A1 PCT/EP1994/003782 EP9403782W WO9514665A1 WO 1995014665 A1 WO1995014665 A1 WO 1995014665A1 EP 9403782 W EP9403782 W EP 9403782W WO 9514665 A1 WO9514665 A1 WO 9514665A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- catalysts
- water
- oxide
- reaction
- caprolactam
- Prior art date
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D201/00—Preparation, separation, purification or stabilisation of unsubstituted lactams
- C07D201/02—Preparation of lactams
- C07D201/08—Preparation of lactams from carboxylic acids or derivatives thereof, e.g. hydroxy carboxylic acids, lactones or nitriles
Definitions
- the present invention relates to a new process for the production of cyclic lactams by reacting aminocarbonitriles with water in the presence of catalysts.
- ÜS-A 4 625 023 described, according to which a highly diluted gas stream of 6-aminocapronitrile, adiponitrile, ammonia, water and carrier gas are passed over a silica gel and a copper / chromium / barium titanium oxide catalyst bed. With 85% conversion, caprolactam is obtained with a selectivity of 91%. Rapid catalyst deactivation can also be observed here.
- the subject of ÜS-A 2 301 964 is the non-catalyzed conversion of 6-aminocapronitrile to caprolactam in aqueous solution at 285 ° C. The yields are below 80%.
- FR-A 2 029 540 describes a process for the cyclization of 6-aminocapronitrile to caprolactam by means of catalysts, where as catalysts, where as catalysts metallic Zn or Cu powder or oxides, hydroxides, halides, cyanides of rubi ⁇ dium, lead, mercury or the elements with an ordinal number 21 to 30 or 39 to 48 are used.
- the catalysts described are used as suspension catalysts in batchwise operated autoclaves. Caprolactam is obtained in yields of up to 83%.
- the complete separation of the catalysts from the valuable product caprolactam causes problems, since caprolactam can form compounds with the soluble constituents of the metals used or very fine particles can be produced by mechanical stirring.
- the object of the present invention was therefore to provide a process for the preparation of cyclic lactams by reacting aminocarbonitriles with water in the presence of catalysts which does not have the disadvantages described above, provides high yields and selectivities and a continuous procedure allowed. Furthermore, the consumption of the catalyst should be kept as low as possible. Furthermore, the separation problems which occur in the suspension procedure, be it through complex formation of the soluble constituents of the catalyst with components of the reaction mixture or through very fine particles which arise as a result of the high mechanical stress during the stirring process.
- reaction in the liquid phase is carried out in a fixed bed reactor in the presence of heterogeneous catalysts which have no soluble constituents under the reaction conditions.
- the heterogeneous catalysts are arranged in a fixed bed through which the reaction mixture flows continuously in trickle or bottoms mode.
- the starting materials in the process according to the invention are aminocarbonitriles, preferably those of the general formula I.
- n and m can each have the values 0, 1, 2, 3, 4, 5, 6, 7, 8 and 9 and the sum of n + m is at least 3, preferably at least 4.
- R 1 and R 2 can in principle be substituents of any kind, it should only be ensured that the desired cyclization reaction is not influenced by the substituents.
- R 1 and R 2 are independently Ci-C ⁇ - alkyl or C 5 -C cycloalkyl groups or C 6 -C 2 aryl groups.
- Particularly preferred starting compounds are aminocarboxylic acid nitriles of the general formula
- the reaction is carried out in the liquid phase at temperatures of generally 140 to 320 ° C, preferably 160 to 280 ° C; the pressure is generally in the range from 1 to 250 bar, preferably from 5 to 150 bar, care being taken that the reaction mixture is predominantly liquid under the conditions used.
- the residence times are generally in the range from 1 to 120, preferably 1 to 90 and in particular 1 to 60 minutes. In some cases, residence times of 1 to 10 minutes have proven to be completely sufficient.
- At least 0.01 mol, preferably 0.1 to 20 and in particular 1 to 5 mol, of water are used per mol of aminocarbonitrile.
- the aminocarbonitrile is advantageously in the form of a 1 to 50% by weight, in particular 5 to 50% by weight, particularly preferably 5 to 30% by weight solution in water (in which case the solvent is also the reactant) or used in water / solvent mixtures.
- solvents are alkanols such as methanol, ethanol, n- and i-propanol, n-, i- and t-butanol and polyols such as diethylene glycol and tetraethylene glycol, hydrocarbons such as petroleum ether, benzene, Toluene, xylene, lactams such as pyrrolidone or caprolactam or alkyl-substituted lactams such as N-methylpyrrolidone, N-methylcaprolactam or N-ethylcaprolactam and carboxylic acid esters, preferably those of carboxylic acids having 1 to 8 carbon atoms.
- Ammonia can also be present in the reaction.
- Mixtures of organic solvents can of course also be used.
- heterogeneous catalysts acidic, basic or amphoteric oxides of the elements of the second, third or fourth main group of the periodic table, such as calcium oxide, magnesium oxide, boron oxide, aluminum oxide, tin oxide or silicon dioxide as pyrogenically produced silicon dioxide, as silica gel, diatomaceous earth, Quartz or mixtures thereof, furthermore oxides of metals of the second to sixth subgroup of the periodic table, such as titanium oxide, amorphous, as anatase or rutile, zirconium oxide, zinc oxide, manganese oxide or mixtures thereof.
- acidic, basic or amphoteric oxides of the elements of the second, third or fourth main group of the periodic table such as calcium oxide, magnesium oxide, boron oxide, aluminum oxide, tin oxide or silicon dioxide as pyrogenically produced silicon dioxide, as silica gel, diatomaceous earth, Quartz or mixtures thereof, furthermore oxides of metals of the second to sixth subgroup of the periodic table, such as titanium oxide, amorphous, as anata
- Oxides of lanthanides and actinides such as cerium oxide, thorium oxide, praseodymium oxide, samarium oxide, rare earth mixed oxide, or mixtures thereof with the aforementioned oxides can also be used.
- Other catalysts can be, for example:
- Selenides and tellurides such as zinc telluride, tin selenide, molybdenum sulfide, tungsten sulfide, sulfides of nickel, zinc and chromium can be used.
- the abovementioned compounds can be doped with compounds of the 1st and 7th main groups of the periodic table or contain them.
- these catalysts can each contain up to 50% by weight of copper, tin, zinc, manganese, iron, cobalt, nickel, ruthenium, palladium, platinum, silver or rhodium.
- the catalysts can be used as full contacts or supported catalysts.
- titanium dioxide can be used as a titanium dioxide strand or as titanium dioxide applied to a carrier in a thin layer. To apply Ti0 to a carrier such as
- Silicon dioxide, aluminum oxide or zirconium dioxide can all be used in the methods described in the literature.
- a thin TiO 2 layer can be applied by hydrolysis of Ti organyls such as Ti isopropylate or Ti butoxide, or by hydrolysis of TiCl 4 or other inorganic Ti-containing compounds. Brine containing titanium oxide can also be used.
- the advantage of the fixed bed procedure according to the invention lies on the one hand in the possibility of continuously operating the cyclization in a simple manner.
- the yields and selectivities achieved in the fixed bed are very high and thus allow short residence times with very high throughputs. Since, according to previous observations, the catalysts used have a long service life, the catalyst consumption is extremely low.
- the separation problems which occur in the suspension procedure be it due to complex formation of the soluble constituents of the catalyst with components of the reaction mixture or due to very fine particles which arise due to the high mechanical stress during the stirring process, are completely eliminated by the continuously operated fixed bed procedure. Examples
- a solution of 6-aminocapronitrile (ACN) in water was placed at 100 bar into a heated tubular reactor of 25 ml content (diameter 6 mm; length 800 mm), which was filled with titanium dioxide (anatase) in the form of 1.5 mm strands and ethanol passed in the weight ratios given in the table.
- the product stream leaving the reactor was analyzed by gas chromatography and high pressure liquid chromatography (HPLC). The results are also shown in the table.
- Example 1 According to the experiments described in Example 1, a solution of 10% aminocapronitrile. 6.4% water and 83.6% ethanol without heterogeneous catalyst at 250 ° C. and a residence time of 30 minutes in an empty tube reactor. The conversion was 28% and the selectivity to caprolactam 74%.
- Examples 7 to 16 were carried out in the same tubular reactor, 13.3 g of TiO 2 being used.
- Examples 17 to 22 were carried out in the same tubular reactor, 20 g of TiO 2 being used.
- Example cat Solution temp. Water / inflow free VWZ convers. Be. medium [° C] ACN [ml / h] volume [min] [%] [mol / mol] [ml]
- TEG tetraethylene glycol
- Examples 23 to 27 were carried out in the same tubular reactor, with different catalysts being used.
- Example cat Solution temp. Water / inflow free VWZ convers. Be. medium [° C] ACN [ml / h] volume [min] [%] [%] [mol / mol] [ml]
Landscapes
- Organic Chemistry (AREA)
- Chemical & Material Sciences (AREA)
- Low-Molecular Organic Synthesis Reactions Using Catalysts (AREA)
- Catalysts (AREA)
- Other In-Based Heterocyclic Compounds (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Nitrogen And Oxygen Or Sulfur-Condensed Heterocyclic Ring Systems (AREA)
- Hydrogenated Pyridines (AREA)
- Cable Accessories (AREA)
- Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
- Polyamides (AREA)
- Peptides Or Proteins (AREA)
- Medicines That Contain Protein Lipid Enzymes And Other Medicines (AREA)
- Mounting Of Bearings Or Others (AREA)
- Cephalosporin Compounds (AREA)
- Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
Abstract
Description
Claims
Priority Applications (10)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU10650/95A AU1065095A (en) | 1993-11-20 | 1994-11-15 | Process for manufacturing caprolactam |
CA002176836A CA2176836C (en) | 1993-11-20 | 1994-11-15 | The preparation of caprolactam |
US08/646,278 US5646277A (en) | 1993-11-20 | 1994-11-15 | Preparation of caoprolactam |
DE59408049T DE59408049D1 (de) | 1993-11-20 | 1994-11-15 | Verfahren zur herstellung von caprolactam |
PL94314527A PL314527A1 (en) | 1993-11-20 | 1994-11-15 | Caprolactam producing method |
JP51480095A JP3824321B2 (ja) | 1993-11-20 | 1994-11-15 | カプロラクタムの製造方法 |
EP95901381A EP0729454B1 (de) | 1993-11-20 | 1994-11-15 | Verfahren zur herstellung von caprolactam |
UA96062430A UA41964C2 (uk) | 1993-11-20 | 1994-11-15 | Спосіб одержання циклічних лактамів |
KR1019960702616A KR100310509B1 (ko) | 1993-11-20 | 1994-11-15 | 카프로락탐의 제조 방법 |
BR9408100A BR9408100A (pt) | 1993-11-20 | 1994-11-15 | Processo para produção de lactamas cíclicas |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4339648A DE4339648A1 (de) | 1993-11-20 | 1993-11-20 | Verfahren zur Herstellung von Caprolactam |
DEP4339648.8 | 1993-11-20 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1995014665A1 true WO1995014665A1 (de) | 1995-06-01 |
Family
ID=6503070
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP1994/003781 WO1995014664A1 (de) | 1993-11-20 | 1994-11-15 | Verfahren zur herstellung von caprolactam |
PCT/EP1994/003782 WO1995014665A1 (de) | 1993-11-20 | 1994-11-15 | Verfahren zur herstellung von caprolactam |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP1994/003781 WO1995014664A1 (de) | 1993-11-20 | 1994-11-15 | Verfahren zur herstellung von caprolactam |
Country Status (25)
Country | Link |
---|---|
US (2) | US5646277A (de) |
EP (2) | EP0729453B1 (de) |
JP (2) | JP3824321B2 (de) |
KR (2) | KR100310509B1 (de) |
CN (2) | CN1061976C (de) |
AT (2) | ATE178318T1 (de) |
AU (2) | AU1065095A (de) |
BR (2) | BR9408099A (de) |
CA (2) | CA2176741C (de) |
CZ (2) | CZ284794B6 (de) |
DE (3) | DE4339648A1 (de) |
DK (1) | DK0729453T3 (de) |
ES (2) | ES2129791T3 (de) |
FI (1) | FI112651B (de) |
HU (1) | HU218503B (de) |
MY (2) | MY111913A (de) |
NO (1) | NO304594B1 (de) |
NZ (1) | NZ276096A (de) |
PL (2) | PL314527A1 (de) |
PT (1) | PT729453E (de) |
RU (2) | RU2119912C1 (de) |
SG (2) | SG55170A1 (de) |
TW (1) | TW382624B (de) |
UA (2) | UA41965C2 (de) |
WO (2) | WO1995014664A1 (de) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1996020923A1 (de) * | 1995-01-03 | 1996-07-11 | Basf Aktiengesellschaft | Verfahren zur kontinuierlichen reinigung von aus 6-aminocapronitril hergestelltem roh-caprolactam |
WO1998050355A1 (de) * | 1997-05-02 | 1998-11-12 | Basf Aktiengesellschaft | Verfahren zur herstellung cyclischer lactame |
WO1999047500A1 (de) * | 1998-03-18 | 1999-09-23 | Basf Aktiengesellschaft | Verfahren zur herstellung von lactamen mit hilfe von oligophosphat-katalysatoren |
FR2781796A1 (fr) * | 1998-07-28 | 2000-02-04 | Rhone Poulenc Fibres | Procede de deshydratation de lactame |
WO2002008171A2 (de) * | 2000-07-11 | 2002-01-31 | Basf Aktiengesellschaft | Verfahren zur abtrennung von ammoniak |
Families Citing this family (28)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4443125A1 (de) * | 1994-12-03 | 1996-06-05 | Basf Ag | Verfahren zur Herstellung von Caprolactam |
FR2729949A1 (fr) | 1995-01-27 | 1996-08-02 | Rhone Poulenc Chimie | Procede de preparation de lactame |
DE19517823A1 (de) * | 1995-05-18 | 1996-11-21 | Basf Ag | Verfahren zur Herstellung von Caprolactam |
DE19517821A1 (de) * | 1995-05-18 | 1996-11-21 | Basf Ag | Verfahren zur Herstellung von Caprolactam |
DE19518474A1 (de) * | 1995-05-19 | 1996-11-21 | Basf Ag | Verfahren zur Herstellung von Carbonsäurederivaten |
FR2735471B1 (fr) * | 1995-06-16 | 1997-08-22 | Rhone Poulenc Chimie | Procede de preparation de lactames |
DE19623662A1 (de) * | 1996-06-13 | 1997-12-18 | Basf Ag | Verfahren zur Reinigung von epsilon-Caprolactam |
DE19632006A1 (de) * | 1996-08-08 | 1998-02-12 | Bayer Ag | Verfahren zur Herstellung von Lactamen |
US5877314A (en) * | 1997-02-14 | 1999-03-02 | Dsm N.V. | Process to continuously prepare an aqueous mixture of episilon caprolactum and episilon caprolactum precursors |
DE19738464A1 (de) * | 1997-09-03 | 1999-03-04 | Basf Ag | Verwendung von Formkörpern als Katalysator zur Herstellung von Caprolactam |
DE19738463C2 (de) * | 1997-09-03 | 1999-09-23 | Basf Ag | Verfahren zur Herstellung von Caprolactam |
JP2001514076A (ja) * | 1997-09-03 | 2001-09-11 | ビーエーエスエフ アクチェンゲゼルシャフト | 触媒として有用な材料賦形体 |
DE19804023A1 (de) * | 1998-02-02 | 1999-08-05 | Basf Ag | Kontinuierliches Verfahren zur Herstellung von Polyamiden aus Aminonitrilen |
DE19804014A1 (de) | 1998-02-02 | 1999-08-05 | Basf Ag | Diskontinuierliches Verfahren zur Herstellung von Polyamiden aus Aminonitrilen |
DE19804033A1 (de) | 1998-02-02 | 1999-08-05 | Basf Ag | Kontinuierliches Verfahren zur Herstellung von Polyamiden aus Aminonitrilen |
DE19808190A1 (de) * | 1998-02-26 | 1999-09-02 | Basf Ag | Verfahren zur Herstellung von Polyamiden |
DE19808489A1 (de) * | 1998-02-27 | 1999-09-02 | Basf Ag | Verfahren zur Herstellung von Polymermischungen aus Aminonitrilen und thermoplastischen Polymeren |
DE19808490A1 (de) | 1998-02-27 | 1999-09-02 | Basf Ag | Verfahren zur Herstellung von Polyamiden aus Aminocarbonsäureverbindungen |
US6346641B1 (en) | 1998-07-20 | 2002-02-12 | Basf Aktiengesellschaft | Method for simultaneous production of 6-aminocapronitrile and hexamethylenediamine |
FR2781393B1 (fr) * | 1998-07-22 | 2000-08-25 | Rhone Poulenc Fibres | Procede de regeneration d'un catalyseur d'hydrolyse cyclisante d'un aminonitrile en lactame et utilisation du catalyseur regenere pour la fabrication de lactames |
DE19839338A1 (de) | 1998-08-28 | 2000-03-02 | Basf Ag | Verbessertes Verfahren zur gleizeitigen Herstellung von 6-Aminocapronitril und Hexamethylendiamin |
DE19846014A1 (de) | 1998-10-06 | 2000-04-13 | Basf Ag | Beschleuniger für die Herstellung von Polyamiden aus Aminonitrilen |
DE10021201A1 (de) * | 2000-05-03 | 2001-11-08 | Basf Ag | Verfahren zur Herstellung cyclischer Lactame |
DE10021191A1 (de) * | 2000-05-03 | 2001-11-08 | Basf Ag | Verfahren zur Herstellung eines Polymers unter Verwendung von Caprolactam |
MY127068A (en) * | 2000-06-05 | 2006-11-30 | Basf Ag | Removal of ammonia from solutions including caprolactam and ammonia |
US6437089B1 (en) | 2001-06-01 | 2002-08-20 | E. I. Du Pont De Nemours And Company | Process for the production of nylon 6 |
DE102004027022A1 (de) * | 2004-06-02 | 2006-01-05 | Basf Ag | Verfahren zur Abtrennung von Ammoniak und Wasser aus Lactam-haltigen Gemischen |
FR2944791B1 (fr) * | 2009-04-27 | 2012-02-10 | Rhodia Operations | Procede de preparation de lactames. |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2301964A (en) * | 1941-09-12 | 1942-11-17 | Du Pont | Method of preparing lactams |
FR2029540A1 (en) * | 1969-01-28 | 1970-10-23 | Asahi Chemical Ind | Epsilon caprolactam by one step synthesis |
EP0150295A2 (de) * | 1983-12-19 | 1985-08-07 | Allied Corporation | Selektive Herstellung von N-substituierten Amiden unter Verwendung von Cu(O)/Metalloxid-Katalysator-Zusammensetzungen |
US4625023A (en) * | 1985-09-03 | 1986-11-25 | Allied Corporation | Selective conversion of aliphatic and aromatic aminonitriles and/or dinitriles into lactams |
US4628085A (en) * | 1985-09-03 | 1986-12-09 | Allied Corporation | Use of silica catalyst for selective production of lactams |
-
1993
- 1993-11-20 DE DE4339648A patent/DE4339648A1/de not_active Withdrawn
-
1994
- 1994-11-15 KR KR1019960702616A patent/KR100310509B1/ko not_active IP Right Cessation
- 1994-11-15 HU HU9601337A patent/HU218503B/hu not_active IP Right Cessation
- 1994-11-15 PL PL94314527A patent/PL314527A1/xx unknown
- 1994-11-15 JP JP51480095A patent/JP3824321B2/ja not_active Expired - Fee Related
- 1994-11-15 PL PL94314526A patent/PL179509B1/pl not_active IP Right Cessation
- 1994-11-15 ES ES95901381T patent/ES2129791T3/es not_active Expired - Lifetime
- 1994-11-15 CN CN94194815A patent/CN1061976C/zh not_active Expired - Fee Related
- 1994-11-15 DE DE59408049T patent/DE59408049D1/de not_active Expired - Fee Related
- 1994-11-15 WO PCT/EP1994/003781 patent/WO1995014664A1/de active IP Right Grant
- 1994-11-15 DE DE59410076T patent/DE59410076D1/de not_active Expired - Lifetime
- 1994-11-15 JP JP51479995A patent/JP4249257B2/ja not_active Expired - Fee Related
- 1994-11-15 PT PT95900739T patent/PT729453E/pt unknown
- 1994-11-15 RU RU96113082A patent/RU2119912C1/ru not_active IP Right Cessation
- 1994-11-15 ES ES95900739T patent/ES2173162T3/es not_active Expired - Lifetime
- 1994-11-15 AT AT95901381T patent/ATE178318T1/de not_active IP Right Cessation
- 1994-11-15 AU AU10650/95A patent/AU1065095A/en not_active Abandoned
- 1994-11-15 CZ CZ961445A patent/CZ284794B6/cs not_active IP Right Cessation
- 1994-11-15 RU RU96113079A patent/RU2120437C1/ru not_active IP Right Cessation
- 1994-11-15 BR BR9408099A patent/BR9408099A/pt not_active IP Right Cessation
- 1994-11-15 SG SG1996008752A patent/SG55170A1/en unknown
- 1994-11-15 UA UA96062434A patent/UA41965C2/uk unknown
- 1994-11-15 BR BR9408100A patent/BR9408100A/pt not_active IP Right Cessation
- 1994-11-15 KR KR1019960702497A patent/KR100310508B1/ko not_active IP Right Cessation
- 1994-11-15 CN CN94194726A patent/CN1070476C/zh not_active Expired - Fee Related
- 1994-11-15 UA UA96062430A patent/UA41964C2/uk unknown
- 1994-11-15 NZ NZ276096A patent/NZ276096A/en unknown
- 1994-11-15 CA CA002176741A patent/CA2176741C/en not_active Expired - Fee Related
- 1994-11-15 US US08/646,278 patent/US5646277A/en not_active Expired - Fee Related
- 1994-11-15 EP EP95900739A patent/EP0729453B1/de not_active Expired - Lifetime
- 1994-11-15 DK DK95900739T patent/DK0729453T3/da active
- 1994-11-15 CZ CZ961446A patent/CZ284795B6/cs not_active IP Right Cessation
- 1994-11-15 EP EP95901381A patent/EP0729454B1/de not_active Expired - Lifetime
- 1994-11-15 AT AT95900739T patent/ATE214047T1/de not_active IP Right Cessation
- 1994-11-15 AU AU81435/94A patent/AU678643B2/en not_active Ceased
- 1994-11-15 CA CA002176836A patent/CA2176836C/en not_active Expired - Fee Related
- 1994-11-15 WO PCT/EP1994/003782 patent/WO1995014665A1/de active IP Right Grant
- 1994-11-15 SG SG1996007444A patent/SG47102A1/en unknown
- 1994-11-16 US US08/646,279 patent/US5739324A/en not_active Expired - Lifetime
- 1994-11-16 TW TW083110632A patent/TW382624B/zh not_active IP Right Cessation
- 1994-11-18 MY MYPI94003084A patent/MY111913A/en unknown
- 1994-11-18 MY MYPI94003086A patent/MY111427A/en unknown
-
1996
- 1996-05-15 FI FI962069A patent/FI112651B/fi not_active IP Right Cessation
- 1996-05-15 NO NO962021A patent/NO304594B1/no not_active IP Right Cessation
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2301964A (en) * | 1941-09-12 | 1942-11-17 | Du Pont | Method of preparing lactams |
FR2029540A1 (en) * | 1969-01-28 | 1970-10-23 | Asahi Chemical Ind | Epsilon caprolactam by one step synthesis |
EP0150295A2 (de) * | 1983-12-19 | 1985-08-07 | Allied Corporation | Selektive Herstellung von N-substituierten Amiden unter Verwendung von Cu(O)/Metalloxid-Katalysator-Zusammensetzungen |
US4625023A (en) * | 1985-09-03 | 1986-11-25 | Allied Corporation | Selective conversion of aliphatic and aromatic aminonitriles and/or dinitriles into lactams |
US4628085A (en) * | 1985-09-03 | 1986-12-09 | Allied Corporation | Use of silica catalyst for selective production of lactams |
Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1996020923A1 (de) * | 1995-01-03 | 1996-07-11 | Basf Aktiengesellschaft | Verfahren zur kontinuierlichen reinigung von aus 6-aminocapronitril hergestelltem roh-caprolactam |
WO1998050355A1 (de) * | 1997-05-02 | 1998-11-12 | Basf Aktiengesellschaft | Verfahren zur herstellung cyclischer lactame |
US6222033B1 (en) | 1997-05-02 | 2001-04-24 | Basf Aktiengesellschaft | Method for producing cyclic lactams |
CN1113865C (zh) * | 1997-05-02 | 2003-07-09 | Basf公司 | 制备环状内酰胺的方法 |
WO1999047500A1 (de) * | 1998-03-18 | 1999-09-23 | Basf Aktiengesellschaft | Verfahren zur herstellung von lactamen mit hilfe von oligophosphat-katalysatoren |
US6407230B1 (en) | 1998-03-18 | 2002-06-18 | Basf Aktiengesellschaft | Method for producing lactams using oligophosphate catalysts |
FR2781796A1 (fr) * | 1998-07-28 | 2000-02-04 | Rhone Poulenc Fibres | Procede de deshydratation de lactame |
WO2000006540A1 (fr) * | 1998-07-28 | 2000-02-10 | Rhodia Fiber And Resin Intermediates | Procede de deshydratation de lactame |
US6635151B1 (en) | 1998-07-28 | 2003-10-21 | Rhodia Fiber & Resin Intermediates | Lactam dehydration method |
WO2002008171A2 (de) * | 2000-07-11 | 2002-01-31 | Basf Aktiengesellschaft | Verfahren zur abtrennung von ammoniak |
WO2002008171A3 (de) * | 2000-07-11 | 2002-05-16 | Basf Ag | Verfahren zur abtrennung von ammoniak |
Also Published As
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