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| Number | Title | Issue Date |
| 7700767 | System and process for purifying an aqueous solution of crude caprolactam A system for purifying an aqueous solution of crude caprolactam is provided, which includes a filtration zone (A), an inspection unit (B), a purification zone (C), and a first temporary storage tank (D). The filtration zone (A) contains a filtration apparatus though... | 04/20/2010 |
| 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 of aminocapronitrile is described which includes eliminating the ammo... | 06/10/2008 |
| 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 a heterogeneous nickel containing hydrogenation catalyst, (b) distill... | 04/29/2008 |
| 7329354 | Purification of organic solvent fluids A chemical distribution system having improved organic solvent fluid purity and consistency includes a vessel containing ion-exchange media positioned within a fluid flow pathway such that the organic solvent fluid passes through the ion-exchange media, thereby effe... | 02/12/2008 |
| 7319113 | Solvent-based recovery and recycle of polyamide material A process is disclosed for recovering polyamide material from post-industrial and post-consumer products containing the polyamide material and insoluble materials. The process includes the steps of: (a) contacting the post-industrial and post-consumer products with ... | 01/15/2008 |
| 7270752 | Process for purifying lactams A process is described for purifying lactams, in particular the lactams obtained by cyclizing hydrolysis of an aminoalkylnitrile, and more particularly to the purification by crystallization of ε-caprolactam obtained by cyclizing hydrolysis of aminocapronitrile. Th... | 09/18/2007 |
| 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 with water to give a reaction mixture b) remo... | 05/15/2007 |
| 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. In particular the invention relates to a method for the manufacture of... | 02/06/2007 |
| 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 resulting in a first bottom product comprising heavy components and capro... | 11/28/2006 |
| 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 caprolactam raw material and, where applica... | 10/31/2006 |
| 7115671 | Process for recovering monomeric units of a nylon from whole carpet The invention relates to a process for recovering monomeric units of a nylon from carpet material. The carpet material includes fibres containing nylon bound to a backing containing one or more non-nylon components. The carpet material contains between 15 and 35 wt.... | 10/03/2006 |
| 7066171 | Process and apparatus for producing inhalable medicaments A method for crystallizing a substance, especially an inhalable medicament, comprising the following steps: (a) dissolving said substance in a solvent, to produce a solution of said substance, (b) producing a segme... | 06/27/2006 |
| 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 produce a mixture of HMD and HMI that can be separated easily by simple d... | 06/13/2006 |
| 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 comprising at least one oxime, providing at least one catalyst, adding the ... | 04/04/2006 |
| 6953541 | Flexible polyolefin compounds for vehicle applications The present invention provides a method for preparing flexible thermoplastic compositions that may be used separately or combined with up to fifty percent thermoplastic scrap. One embodiment of the invention comprises creating a melt-blend of blending composition, u... | 10/11/2005 |
| 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 than 10 bar. ... | 05/24/2005 |
| 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 solution, resulting in a washed solution ... | 02/01/2005 |
| 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 substances shall not remain the final products, but still give birth to syn... | 01/11/2005 |
| 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 mixture by distillation. This has proved to be a very simple and direc... | 03/16/2004 |
| 6663848 | Process and apparatus for producing inhalable medicaments A method for crystallizing a substance, especially an inhalable medicament, comprising the following steps: (a) dissolving said substance in a solvent, to produce a solution of said substance, (b) producing a segmented stream which consists of alternat... | 12/16/2003 |
| 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 and water (this reaction also being called cyclizing hydroly... | 10/21/2003 |
| 6596862 | Purification of N-vinyl-&3xb5;-caprolactam A process for purifying N-vinyl-&3xb5;-caprolactam comprises converting the N-vinyl-&3xb5;-caprolactam which is to be purified and has a purity of at least 95% by weight into a melt, partially crystallizing the melt and separating the crystals from the mo... | 07/22/2003 |
| 6579979 | Treatment/purification of lactam media of reaction Lactam liquid media of reaction which comprise at least one lactam final product, notably &3xb5;-caprolactam, are treated and purified to convert impurities contained therein into harmless species or species easily removed downstream, by hydrogenating suc... | 06/17/2003 |
| 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 in which depolymerization of at least part of said nylon i... | 12/24/2002 |
| 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 impure or crude caprolactam, which comprises at a minimum... | 12/17/2002 |
| 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 is also called cyclizing hydrolysis). The process for dis... | 11/19/2002 |
| 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 respectively described. The leach resistance of the catalyst ... | 09/24/2002 |
| 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 releasing the caprolactam from the organic solvent by means of e... | 09/10/2002 |
| 6433166 | Process for producing &3xb5;-caprolactam A high purity &3xb5;-caprolactam is prepared by pouring a molten crude &3xb5;-caprolactam and a solvent comprising an aliphatic hydrocarbon and having a lower temperature than that of the crude &3xb5;-caprolactam, into a vessel and mixing them to obtain a... | 08/13/2002 |
| 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 mixture thereof contained in an acidic medium and (b) an ... | 07/09/2002 |
| 6384216 | Purification of alkenyl compounds A process for purifying alkenyl compounds having a divalent or trivalent heteroatom in the -position relative to the double bond by distillation comprises carrying out at least two distillations in which the purified alkenyl compounds are obtained ... | 05/07/2002 |
| 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.... | 03/19/2002 |
| 6344557 | Process for producing &3xb5;-caprolactam The present invention provides a method for producing &3xb5;-caprolactam which comprises the step of treating, with water, a reaction product containing 1-aza-2-alkoxy-1-cycloheptene, which is obtained by gas phase Beckmann rearrangement reaction of cyclo... | 02/05/2002 |
| 6323341 | Process for the continuous purification of crude &3xb5;-caprolactam The invention relates to a process for the purification of crude &3xb5;-caprolactam, wherein crude &3xb5;-caprolactam prepared by cyclization of alkyl 6-aminocaproate, 6-aminocapronitrile, 6-aminocaproic acid, 6-aminocaproic amide and/or oligomers thereof... | 11/27/2001 |
| 6252068 | Process for producing &3xb5;-caprolactam A high purity &3xb5;-caprolactam is prepared by crystallizing an &3xb5;-caprolactam from a hydrocarbon solution containing a crude &3xb5;-caprolactam, and allowing the crystallized &3xb5;-caprolactam in contact with hydrogen in the presence of a hydrogena... | 06/26/2001 |
| 6207827 | Process to separate &3xb5;-caprolactam from 6-aminocaproamide and 6-aminocaproamide oligomers Process to separate &3xb5;-caprolactam from 6-aminocaproamide and 6-aminocaproamide oligomers, wherein &3xb5;-caprolactam, 6-aminocaproamide and 6 aminocaproamide oligomers are present in a first aqueous starting mixture, which mixture is contacted with a... | 03/27/2001 |
| 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.... | 03/27/2001 |
| 6191274 | Recovery of &3xb5;-caprolactam Process to separate &3xb5;-caprolactam from an aqueous mixture containing &3xb5;-caprolactam and at least 0.5 wt % oligomers, wherein the separation is performed by extraction using an organic extraction agent. The aqueous mixture may be obtained in a pro... | 02/20/2001 |
| 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 crude caprolactam and steam; (b) condensing or distilling said crude... | 02/13/2001 |
| 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 comprising nylon 6 with water at a temperature between about 20... | 08/29/2000 |
