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7615137 |
Process for recovering caprolactam from aqueous caprolactam product using in situ prepared alkali amino caproate
A continuous process is provided for recovering caprolactam from aqueous caprolactam product which includes (i) caprolactam, (ii) impurities, and (iii) water by (a) adding alkali hydroxide to the...
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7538143 |
Method for the treatment of waste containing polyamide with the reprocessing of the depolymerisation residue
The invention relates to a method for the treatment of waste containing polyamide comprising a) depolymerisation of the waste containing polyamide, whereby a caprolactam raw material ( 6 ) and a...
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7501047 |
Method for purifying caprolactam
The disclosure relates to a process for purifying crude caprolactam. The process involves converting a first mixture of 6-amino capronitrile and water to a second mixture of caprolactam ammonia,...
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7384518 |
Method for purifying lactams
A method and a plant are disclosed for purifying lactams, particularly lactams obtained by cyclizing hydrolysis of aminonitrile. The purification of ε-caprolactam obtained by cyclizing hydrolysis...
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7365195 |
Process for purifying caprolactam
The invention relates to a process for purifying caprolactam, said process comprising (a) subjecting the caprolactam to a hydrogenation by treating the caprolactam with hydrogen in the presence of...
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7217818 |
Purification of caprolactam
A process for removing high boilers from crude caprolactam which comprises high boilers, caprolactam and in some cases low boilers, and which has been obtained by
a) reacting 6-aminocapronitrile...
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7173127 |
Method for the manufacture of caprolactam from waste containing polyamides
This invention relates to a continuous and efficient method for the manufacture of highly pure caprolactam suitable for the polycondensation of Polyamide 6 (polycaprolactam) from polyamide waste....
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7141668 |
Process for recovering caprolactam
The invention relates to a process for recovering caprolactam from a mixture comprising caprolactam, water, light and heavy components, by subjecting the mixture to a first vacuum distillation...
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7129347 |
Method for purifying caprolactam from waste containing polyamide using UV radiation
The invention relates to a method for the continuous production of caprolactam from waste containing polyamide, comprising
a) depolymerisation of the waste containing polyamide, whereby a...
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7060819 |
Process for producing hexamethylenediamine and aminocapronitrile from adiponitrile, wherein the hexamethylenediamine contains less than 100 ppm tetrahydroazepine
Process for making both ACN and HMD from partial hydrogenation of ADN by using a combination of distillations resulting in the formation of a mixture of HMD and THA that can be hydrogenated to...
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7022844 |
Amide-based compounds, production, recovery, purification and uses thereof
Methods are disclosed of producing and purifying at least one amide. In accordance with one of the methods disclosed herein, the at least one amide is produced by providing an organic liquid...
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6896772 |
Method for separating ammonia from solutions containing caprolactam and ammonia
A process for distillative removal of ammonia from solutions (I) which include a lactam and ammonia comprises effecting said removal in a distillation apparatus (a) at an absolute pressure of less...
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6849731 |
Process for recovering and purifying caprolactam from an organic solvent
Process for recovering caprolactam from a solution comprising caprolactam dissolved in an organic solvent, said process comprising:
a) washing the solution with water or an aqueous alkaline...
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6841709 |
Method of cutting polymer chains and method for producing chemical raw materials
The present invention is to provide a technology to establish a new cycle-based organic chemical industry, which may be called a polymer cascade (polymer reflux industry) wherein the polymer...
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6706153 |
Process for the separation of a ketoxime or aldoxime from an amide
The invention relates to a process for the separation of a ketoxime or aldoxime from a ketoxime- or aldoxime-containing amide mixture in which the ketoxime or aldoxime is separated from the amide...
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6635151 |
Lactam dehydration method
The present invention relates to a process for separating the water from an aqueous lactam solution. It applies more particularly to a mixture resulting from the reaction between an aminonitrile...
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6596862 |
Purification of N-vinyl-&egr -caprolactam
A process for purifying N-vinyl-ε-caprolactam comprises converting the N-vinyl-ε-caprolactam which is to be purified and has a purity of at least 95% by weight into a melt, partially...
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6579979 |
Treatment/purification of lactam media of reaction
Lactam liquid media of reaction which comprise at least one lactam final product, notably ε-caprolactam, are treated and purified to convert impurities contained therein into harmless species or...
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6498250 |
Process for nylon depolymerization
The invention relates to a process for nylon depolymerization, in which process a multi-component material, comprising nylon and one or more non-nylon components, is fed to a depolymerization zone...
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6495682 |
Process for recovering caprolactam and steam
The present invention relates to a process for purifying an impure stream of caprolactam while recovering not only pure caprolactam but also medium-to-high pressure steam. Preferably, the stream of...
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6482297 |
Method for distilling ammonia
The present invention relates to an improved process for distilling ammonia from a mixture, more particular from a mixture resulting from the reaction between aminonitrile and water (which reaction...
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6455023 |
Metallic catalysts for non-neutral liquid media
Carbon monolith-supported catalysts with high leach resistance used in catalytic applications involving strong acidic and basic conditions in a pH range of from 0 to 6.5 and from 7.5 to 14, are...
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6448395 |
Process for purifying caprolactam
Process for purifying an aqueous caprolactam mixture by extracting the caprolactam with the aid of an organic caprolactam solvent that is not miscible with water in a benzene extraction, and...
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6433166 |
Process for producing &egr -caprolactam
A high purity ε-caprolactam is prepared by pouring a molten crude ε-caprolactam and a solvent comprising an aliphatic hydrocarbon and having a lower temperature than that of the crude...
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6417356 |
Stabilization of vinylether and vinyl lactam formulations against hydrolysis
This invention relates to a composition containing (a) a component selected from the group of a mono- or poly- vinyl substituted mono- or poly-ether, a mono- or poly- vinyl substituted lactam, or a...
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6384216 |
Purification of alkenyl compounds
A process for purifying alkenyl compounds having a divalent or trivalent heteroatom in the α-position relative to the double bond by distillation comprises carrying out at least two distillations...
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6359128 |
Free-flowing flakes of vinyl caprolactam monomer and process for making same
Free-flowing flakes of vinyl caprolactam monomer usable below its melting point of 34° C. without developing coloration.
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6344557 |
Process for producing &egr -caprolactam
The present invention provides a method for producing ε-caprolactam which comprises the step of treating, with water, a reaction product containing 1-aza-2-alkoxy-1-cycloheptene, which is obtained...
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6323341 |
Process for the continuous purification of crude ε-caprolactam
The invention relates to a process for the purification of crude ε-caprolactam, wherein crude ε-caprolactam prepared by cyclization of alkyl 6-aminocaproate, 6-aminocapronitrile, 6-aminocaproic...
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6252068 |
Process for producing ε-caprolactam
A high purity ε-caprolactam is prepared by crystallizing an ε-caprolactam from a hydrocarbon solution containing a crude ε-caprolactam, and allowing the crystallized ε-caprolactam in contact...
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6207827 |
Process to separate ε-caprolactam from 6-aminocaproamide and 6-aminocaproamide oligomers
Process to separate ε-caprolactam from 6-aminocaproamide and 6-aminocaproamide oligomers, wherein ε-caprolactam, 6-aminocaproamide and 6 aminocaproamide oligomers are present in a first aqueous...
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6207824 |
Purification of N-substituted lactams
A process for reducing the amine content of amine-contaminated N-substituted lactams comprises treating the contaminated N-substituted lactams with an acid macroporous cation exchanger.
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6191274 |
Recovery of ε-caprolactam
Process to separate ε-caprolactam from an aqueous mixture containing ε-caprolactam and at least 0.5 wt % oligomers, wherein the separation is performed by extraction using an organic extraction...
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6187917 |
Process for the purification of caprolactam obtained from the depolymerization of polyamide-containing carpet
The present invention provides a process for the preparation of purified caprolactam comprising the steps of: (a) depolymerizing polyamide-containing carpet in the presence of steam to obtain...
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6111099 |
Process for the recovery of caprolactam from waste containing nylon
A process for depolymerizing nylon 6 and recovering caprolactam from the depolymerized products by extraction with alkyl phenolic compounds. Process steps include (a) treating a first mixture...
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6100396 |
Method for purifying lactams
A method for purifying lactams by liquid-liquid extraction and/or processing with an ion exchange resin is disclosed. The method is useful for purifying lactams produced by the cyclising...
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6087494 |
Depolymerization of polyamides
Process for the depolymerization of one or more polyamides into its monomeric components in the presence of water by means of at least one alkali metal compound, at least one alkaline-earth metal...
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6069246 |
Method for treating lactams
The present invention relates to the treatment of lactams obtained directly from their synthesis process, avoiding the formation of oligomers as far as possible. The invention consists, more...
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6045703 |
Separation processes
This invention relates to a process for separating epsilon caprolactam from a feed mixture comprising epsilon caprolactam and octahydrophenazine which process comprises contacting under adsorption...
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6020486 |
Depolymerization of polyamides
The invention relates to a process for depolymerising one or more polyamides in the presence of at least an aliphatic alcohol, the depolymerisation taking place with at most 40 mol. % catalyst....
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5962681 |
Recovery of caprolactam monomer and oligomer from aqueous polycaprolactam extracts
The disclosure is a process for recovering caprolactam monomer and oligomer from aqueous polycaprolactam extracts by removing the inorganic contaminants present therein.
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5952493 |
Method of purifying ε-caprolactam
Crude caprolactam is purified by reaction with a complex hydride of boron or of aluminum.
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5948908 |
Process for depolymerizing polycaprolactam processing waste to form caprolactam
The present invention provides an improved process for the recovery of caprolactam from polycaprolactam processing waste. The present process for depolymerizing polycaprolactam waste to form...
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5929234 |
Process for depolymerizing nylon-containing whole carpet to form caprolactam
The present invention provides an efficient process for the recovery of caprolactam from polycaprolactam-containing waste material. The present process for depolymerizing multi-component waste...
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5919927 |
Purification of caprolactam from recycled nylon
A method of removing 1,11-diamino-6-undecanone from the pyrolysis product of nylon comprising: a) pyrolyzing nylon-6 to form a pyrolyzate containing a caprolactam mixture; b) dissolving the...
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5877314 |
Process to continuously prepare an aqueous mixture of episilon caprolactum and episilon caprolactum precursors
This continuous process for preparing an aqueous mixture of .di-elect cons.-caprolactam and 6-aminocaproic acid and/or 6-aminocaproamide by involves, as the reductive amination step, continuously...
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5874575 |
Preparation of caprolactam
An improved process for the preparation of caprolactam by heating 6-aminocapronitrile in the presence of a heterogenous catalyst and water under superatmospheric pressure without rapid deactivation...
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5700358 |
Recovery of caprolactam from oligomers and/or polymers of caprolactam
Caprolactam is recovered from oligomers and/or polymers of caprolactam by cleavage of oligomers and/or polymers of caprolactam and subsequent working up by distillation of the caprolactam obtained...
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5685974 |
Compact, efficient, monitorable immiscible fluid separator
Disclosed is a fluid separator for isolating a component from a composite fluid having one fluid entrained within, but immiscible in, another fluid, and the two fluids have differing specific...
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5668277 |
Depolymerization of polyamides
One or more polyamides can be depolymerized in the presence of at least one nitrogen-containing compound. The depolymerization takes place at a pressure between about 0.5 and about 5 atm. The...
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