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JP2616088B2 |
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JPH09143155A |
To produce the subject high-quality compound at a low cost by synthe sizing cyclohexanol from cyclohexene and water, then carrying out the dehydro genating reaction, providing cyclohexanone and subsequently conducting the Beckmann rearra...
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JP2607981B2 |
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JP2601945B2 |
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JP2601946B2 |
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JPH0995480A |
To obtain a high quality -caprolactam in high yield from cyclohexanoneoxime using a static mixer by feeding cyclohexanoneoxime and a Beckmann's rearrangement reaction product containing fuming sulfuric acid under specific conditions. Whe...
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JPH0987247A |
To produce -caprolactam of quality not inferior to that of a conventional product at a low cost by using cyclohexene as a raw material. Methylcyclopentanones contained in cyclohexanone used for reaction with hydroxylamine are regulated t...
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JPH0940642A |
To obtain at low cost high-purity -caprolactam, from cyclohexene as the starting material, by controlling the concentrations of the indanes in the cyclohexanol to be subjected to dehydrogenation to a specified level or lower. First, cycl...
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JPH0940641A |
To easily obtain an amide in high efficiency by bringing an oxime in a liquid phase into contact with a zeolite catalyst bearing iminium ions to effect facilitating catalyst separation and recovery and also enabling continuous flow-throu...
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JPH0931051A |
To safely and simply produce a compound useful as a raw material for nylon-6 or nylon-12 suitable as an industrial resin without forming ammonium sulfate or using any substance having high dangerousness. A cycloalkanone (a 5-15C cyclic k...
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JPH0931052A |
To produce -caprolactam of quality not inferior to that of a conventional one at a low cost. The content of cyclopentanecarbaldehyde contained in cyclohexanone used for reaction with hydroxylamine is regulated to ≤50ppm in the method f...
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JP2573597B2 |
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JPH0912539A |
PURPOSE: To produce -caprolactam in improved -caprolactam selectivity and catalytic life, etc., on an industrial scale at a low cost by using a catalyst consisting of a pentasil-type zeolite supporting a transition metal. CONSTITUTION: -...
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JP2559903B2 |
Disclosed is an ion exchange purification method of an aqueous caprolactam solution in a process for producing caprolactam and laurolactam by subjecting a mixture of cyclohexanone oxime and cyclododecanone oxime to Beckmann rearrangement...
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JPH08301866A |
To obtain a macrocyclic compound without accompanying it with polycondensation as minor reaction and without an increase in viscosity, degrada tion, the occurrence of bad smell, or the like, by the condensation reaction of a compound hav...
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JPH08301843A |
To provide a depolymerization method capable of obtaining a monomer component in high selectivity by carrying out the depolymerization in the presence of a nitrogen-containing compound under pressure conditions in a specific range. The d...
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JPH08277263A |
PURPOSE: To obtain an amide compound useful as a raw material for nylons by the rearrangement reaction of an oxime compound in the presence of molybdenum and/or tungsten. CONSTITUTION: An amide compound is produced by the Beckmann rearra...
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JPH08277264A |
PURPOSE: To obtain an amide compound useful as a raw material for nylons by the Beckmann rearrangement reaction of an oxime compound in the presence of a specific compound. CONSTITUTION: An amide compound is produced by the rearrangement...
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JPH08269007A |
To provide a method for producing the subject compound in high yield while low in producing byproducts by reacting a formylvalerate ester with ammonia under non-hydrogenating conditions and then hydrogenating the resultant product in the...
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JPH08245572A |
To obtain -caprolactam in a high yield from 5-formylvaleric acid, its ester or amide. The -caprolactam is obtained by the following steps: (a) 5- formylvaleric acid, its ester or amide is contacted with ammonia and water under non-hydrog...
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JPH08217746A |
PURPOSE: To purify recovered -caprolactam into a highly pure product useful as a raw material for fiber in an industrially advantageous manner by purifying the recovered -caprolactam obtained by depolymerizing a thermoplastic resin conta...
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JP2526261B2 |
Water-immiscible solvents are removed from offgases containing same by washing with water-containing caprolactam.
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JPH08198845A |
PURPOSE: To obtain the subject high-purity compound without forming a by- product by making an isomerization inhibitor coexist in a catalytic hydration reaction system of cyclohexene, dehydrating a formed substance, then reacting it with...
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JP2520582B2 |
PURPOSE: To obtain both a new hydroxybenzylphenylpyrrolidine derivative useful as an intermediate for producing γ-butyrolactam having anti-amnesia action and a new phenylpyrrolidine useful as its starting raw material. CONSTITUTION: Thi...
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JPH08193061A |
PURPOSE: To provide an industrially useful process for producing -caprolactam having a quality comparable to that of the conventional products inexpensively. CONSTITUTION: In this process for production of -caprolactam, cyclohexanol as a...
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JPH08176102A |
PURPOSE: To provide the method for producing the -caprolactam useful on industry, enabling to produce the -caprolactam not inferior to the conventional quality at a low cost. CONSTITUTION: The method for producing the -caprolactam by hyd...
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JP2506021B2 |
PURPOSE: To provide a process for the continuous and stable purification of caprolactam in high efficiency and purity. CONSTITUTION: Crude caprolactam is introduced into a 1st distillation column and water is distilled off from the colum...
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JPH08151362A |
PURPOSE: To industrially advantageously obtain an amide compound capable of omitting corrosion prevention of apparatus and neutralization step after reaction because of a method without using acids by subjecting an oxime compound to Beck...
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JP2504792B2 |
Caprolactam is prepared in a process comprising (a) a Beckmann rearrangement of cyclohexanone oxime with oleum at from 70 DEG to 130 DEG C. in one or more rearrangement stages, and (b) aftertreatment of the reaction mixture obtained from...
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JPH08143544A |
PURPOSE: To enable the corrosion of an apparatus due to no use of an acid, eliminate the need for a neutralizing step with an alkali after reaction and industrially and advantageously produce an amide compound. CONSTITUTION: The method f...
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JPH08504182A |
epsilon -Caprolactam is continuously recovered from carpet made from nylon 6 face fibers and a backing. The carpet is fed to a separator to prepare scrap containing nylon 6 and auxiliary materials. The scrap from the separator is fed to ...
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JPH0816096B2 |
Distillation residues from the purification of caprolactam are worked up by heating in the presence of sodium hydroxide or potassium hydroxide and in the presence of a high-boiling hydrocarbon at from 250 DEG to 500 DEG C. and continuous...
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JPH0816097B2 |
Caprolactam is recovered from caprolactam distillation low boilers or high boilers or mixtures thereof by the following steps: (a) crystallizing a low or high boiler or a mixture thereof to form purified capro-lactam crystals and a mothe...
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JPH0848666A |
PURPOSE: To purify -caprolactam into high-purity one utilizable as a raw material for fibers and resins, an intermediate, etc., for raw materials by depolymerizing a thermoplastic material consisting essentially of nylon 6 and crystalliz...
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JPH0841021A |
PURPOSE: To provide a method for recovering caprolactam by cleaving oligomers and/or polymers of caprolactam and reacting the by-products. CONSTITUTION: This method for recovering caprolactam comprises; cleaving oligomers and/or polymers...
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JPH0841022A |
PURPOSE: To provide a method for purifying a crude caprolactam, capable of obtaining caprolactam in higher purity and yield than any conventional methods. CONSTITUTION: This method for recovering and purifying crude caprolactam from crud...
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JPH07330717A |
PURPOSE: To produce high purity -caprolactam through depolymerization by removing non-melting material from melted nylon 6 compound before charging the melted nylon into a reaction vessel in a depolymerization process of a thermoplastic ...
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JPH07330720A |
PURPOSE: To obtain high-purity caprolactam by depolymerizing a thermoplastic substance containing nylon 6 as a principal component and containing further nylon 66, adding a basic substance to the recovered -caprolactam, distilling the re...
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JPH07330719A |
PURPOSE: To obtain high-purity -caprolactam by depolymerizing a thermoplastic substance containing nylon 6 as a principal component and further containing polyethylene terephthalate, recovering the -caprolactam, adding a basic substance ...
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JPH07330718A |
PURPOSE: To produce recovered -caprolactam through depolymerization without inducing troubles concerning residual wastes and on facilities by removing metallic components from a melted nylon 6 compound in depolymerization process of a th...
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JPH07330716A |
PURPOSE: To manufacture high purity -caprolactam without causing a mechanical trouble by controlling the content of cotton in a specified range in the production of -caprolactam by depolymerizing thermoplastic articles consisting mainly ...
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JPH07116140B2 |
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JPH07116139B2 |
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JPH07324070A |
PURPOSE: To produce a lactam, a raw material for nylon or the like in a high yield stably over a long period of time without formation of ammonium sulfate as a by-product by subjecting a substance represented by the empirical formula to ...
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JPH07300454A |
PURPOSE: To convert a ketoxime or an aldoxime into a corresponding amide in a high selectivity and in a high production ratio, by bringing a solution of a ketoxime or an aldoxime into contact with a specific strongly acidic catalyst. CON...
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JPH0794428B2 |
epsilon -caprolactam is prepared by gas phase catalytic synthesis in which cyclohexanone oxime is brought into contact with crystalline alumino-silicate, for example, ZSM-5 (H<+> form) having a constraint index of 1 - 12, an Si/Al atomic...
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JPH0794431B2 |
A process for the preparation of a C(3)-C(4)-transconfigurated gamma -butyrolactam of the formula (I) (I) in which R1 represents hydrogen or alkyl, aryl or aralkyl with in each case up to 10 carbon atoms and R2 and R3 are identical or di...
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JPH0791263B2 |
Method and improved apparatus for recovering a volatile organic material, such as caprolactam, from a liquid mixture of organic and inorganic materials are disclosed. The method features the step of mixing the liquid mixture with superhe...
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JPH0780836B2 |
Reaction mixtures obtained by Beckmann rearrangement of cyclohexanone oxime with sulfuric acid or oleum are neutralized by a process which comprises the following steps: (a) mixing the reaction mixture with recycled ammonium sulfate moth...
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JPH0780837B2 |
In an improved process for preparing caprolactam by heating 6-aminocaproic acid, an ester or amide or mixture thereof in the presence of an inert reaction medium which is liquid under the reaction conditions and has a boiling point above...
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