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JPS6020381B2 |
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JPS6020375B2 |
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JPS6020383B2 |
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JPS6061565A |
8 This invention is a method of purifying crude caprolactam. The improved method comprises taking a portion of a process stream of crude caprolactam having low boiling impurities and distilling the stream in the presence of water by frac...
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JPS6011694B2 |
A process for producing 2-pyrrolidone by the simultaneous hydrolysis and hydrogenation of succinonitrile at elevated temperatures and at hydrogen pressures below 500 psi in the presence of a hydrogenation catalyst.
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JPS607614B2 |
An improved process for the manufacture of cyclohexanone oxime by reacting cyclohexanone with an aqueous hydroxylammonium-ammonium sulfate solution at temperatures above the melting point of cyclohexanone oxime by the countercurrent proc...
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JPS608320A |
PURPOSE: To obtain the titled polymer having high transparency, extremely faint color and stable qualities, by oxidizing an aqueous solution of industrially produced N-(2-aminoethyl)-piperazine, treating with activated carbon, and using ...
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JPS5950676B2 |
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JPS5943945B2 |
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JPS59137489A |
(57) [Abstract] Since this gazette is application data in front of an electronic application, the data of an abstract is not recorded.
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JPS5928215B2 |
Continuous extraction of polylactam granules for the removal of monomers and/or oligomers therefrom by means of hot water flowing countercurrently in an extraction zone, which extraction zone is divided into subzones by at least one heat...
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JPS5924991B2 |
Novel azetidine derivatives of the formula I wherein R1 is an acylamido group, R2 is selected from the group consisting of IIA IIB IIC IID wherein R4, R5 and R6 are individually selected from the group consisting of hydrogen, lower alkyl...
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JPS5919091B2 |
Pyrrolidone-2, or N-substituted derivatives thereof, is prepared by heating an aqueous solution of the corresponding 2-amino- DELTA 1-pyrroline at a temperature of 90 DEG -290 DEG C. The process does not require the use of a Raney nickel...
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JPS5970662A |
PURPOSE: To recover efficiently -caprolactam, by polymerizing an oligomer consisting essentially of a cyclic dimer of the -caprolactam in the presence of phosphoric acid under heating at a specific temperature, and carrying out the decom...
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JPS596849B2 |
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JPS58202048A |
Disclosed is a method for selectively deactivating catalytically active sites which occur only on the surface of a zeolite of boralite catalyst. Active sites occurring on the interior of the pores are masked by saturating the catalyst wi...
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JPS58170742A |
Powder coatings for the preparation of protective films for a wide variety of substrates, said coatings being based on urethane or epoxy systems containing a epsilon -caprolactam-blocked mixed 5(6)-isocyanato-1-(4'-isocyanatophenyl)-1,3,...
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JPS5839148B2 |
New physiologically active N-substituted lactams having the formula wherein R1, R2, R3, R4, R5, R6 and R7, represent independently a hydrogen atom, an alkyl radical containing 1 to 4 carbon atoms or a phenyl group, R8 is a hydrogen atom ...
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JPS5831203B2 |
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JPS5892657A |
Process for preparing a lactam which consists essentially in the reductive amination in the gas phase of an oxoalkane carboxylic acid having the formula R - @ - (CH2)n - COOH or an alkyl ester thereof, wherein R is an alkyl group having ...
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JPS5867666A |
PURPOSE: To prepare caprolactam in high yield, without producing ammonium sulfate, recycling the reaction solvent, by using a polyhydric alcohol having higher boiling point than caprolactam as the reaction medium, and thermally reacting ...
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JPS5865265A |
The invention relates to a process for the preparation of a lactam by reductive amination, with the aid of a hydrogenation catalyst, of an oxo-alkanecarboxylic acid suitable for that purpose or an ester of such an acid. This reductive am...
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JPS587618B2 |
The invention relates to a process for removing boric acid from a lactam which still contains boric acid and has been produced by catalytic rearrangement of oximes wherein an alkali and/or alkaline earth oxide and/or hydroxide is added t...
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JPS57209269A |
PURPOSE: To prepare colorless lactam economically, by vaporizing sulfur impurities from the recovered crude lactam under acidic conditions, making the lactam basic, filtering with activated charcoal, and distilling the product, wherein s...
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JPS57192358A |
Process for the purification of <
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JPS5752328B2 |
Object of the invention is a process for the purification of epsilon -caprolactam prepared either by Beckmann rearrangement or by rearrangement of cyclohexanoxime in the gaseous phase or by depolymerisation of polyamide waste comprising ...
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JPS5748070B2 |
Substantially pure crystals of epsilon -caprolactam-diblocked omega , omega '-diisocyanato-1,3-dimethylbenzene melting at 110 DEG C. or higher are advantageously used as a hardener of powder coating composition.
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JPS57165364A |
PURPOSE: To obtain high quality lactam, by dispersing magnesium oxide or calcium oxide in the aqueous solution of crude lactam before the purification of the recovered lactam, adding an alkali metal hydroxide to the dispersion, and separ...
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JPS57143234U |
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JPS5741467B2 |
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JPS57139062A |
Process for preparing caprolactam from cyclohexanone oxime by passing the oxime, preferably dissolved in a solvent, over a zeolite having a SiO2/Al2O3 of at least 12 and a Constraint Index of from 1 to 12.
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JPS57118559A |
PURPOSE: In separating sulfuric acid from a reaction mixture of Beckmenn rearrangement by diffusion dialysis, to enable the sufficient recovery of dialysis efficiency without requiring the disjointing operation of a dialysis bath, by bri...
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JPS5731742B2 |
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JPS5727103B2 |
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JPS5726593B2 |
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JPS5726515B2 |
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JPS5725029B2 |
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JPS5782365A |
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JPS5754165A |
In a process for obtaining caprolactam by cleaving caprolactam oligomers by passing them through an alumina catalyst bed at an elevated temperature, the improvement that the oligomers are introduced, as liquid or solid, into a fluidized ...
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JPS5745154A |
In a process for continuously extracting caprolactam from an aqueous solution, containing caprolactam and its oligomers, with organic solvents, by introducing the aqueous solution into the upper part of an extraction zone and organic sol...
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JPS5728044A |
Complex salts of lactams or thiolactams and halides or nitrates of heavy metals have the following general formula: wherein: Me is Cu, Zn, Mn, Hg, or Ni; Y is O or S; X is Cl, Br, or NO3; m = 1 or 2; n = 3 or 5; p = 2 or 4; k = 0 or 1; a...
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JPS5726661A |
In a distillation process 2-pyrrolidones obtained from succinonitrile are purified by treating the impure liquid pyrrolidone with a strong base, fractionally distilling this product to yield, as distillate, polymerization grade purified ...
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JPS575594B2 |
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JPS5716860A |
Raw caprolactam for example, extensively freed in a dewatering stage from solvent is subjected in a separation stage to a distillation and a rectification, without intermediate condensation. The product which is produced by the rectifica...
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JPS5643462B2 |
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JPS56123967A |
Process for the preparation of omega -lactams (in particular caprolactam) with improved yields, by reaction of cycloaliphatic derivatives having the general formula: wherein n=3-13 with nitrosating agents in the presence of dehydrating a...
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JPS5699458A |
Process for the preparation of a 2-pyrrolidone by hydrogenation of optionally substituted succinonitrile in the liquid phase in the presence of ammonia using a fixed-bed catalyst and treatment of the hydrogenated product with water, in w...
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JPS5640661A |
Acid halides and anhydrides of acids of the formula with the substituent definitions given in the description are obtained by reacting the corresponding acids with organic or inorganic acid halides or acid anhydrides. The new compounds a...
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JPS5614662B2 |
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JPS5610305B2 |
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