Abstract:
The invention relates to a method for producing lactams by cyclization hydrolysis of aminonitriles in the has phase in the presence of a metal phosphate catalyst. One or more oligophosphates of general formula (I) M(POa)b, wherein M represents a metal group from 3 or 4 of the periodic table including the lanthanides, a>2.5 and
Abstract:
Process to prepare epsilon -caprolactam by treating 6-aminocaproic acid, 6-aminocaproate ester or 6-aminocaproamide or mixtures comprising at least two of these compounds in the presence of superheated steam in which a gaseous mixture comprising epsilon -caprolactam and steam is obtained, wherein the process is carried out in the absence of a catalysts at a temperature between 250 and 400 DEG C and at a pressure of between 0.5 and 2 MPa. The invention also encompasses a process to prepare epsilon -caprolactam starting from 6-aminocapronitrile by performing a hydrolysis and a subsequent step as described above.
Abstract:
Method for preparing caprolactam by heating 6-aminocapric acid nitrile in the presence of heterogeneous catalysts ans water under elevated pressure, wherein (a) 6-aminocapric acid nitrile or a mixture containing essentially 6-aminocapric acid nitrile as well as water and a low-boiling or a high-boiling alcohol is heated in the presence of a heterogeneous catalyst in a reactor A to produce a mixture (I); then (b) mixture (I) is distilled, yielding a head fraction, caprolactam and a bottom product, with any ammonia in mixture (I) being removed prior to distillation; and then (c1) the head fraction is fed into the reactor of step (a), with the head fraction optionally being mixed with the alcohol and/or water and/or 6-aminocapric nitrile used in step (a) before being fed into reactor (A); or (c2) the head fraction, optionally with the bottom product from step (b), is fed into a reactor (B), the first fraction optionally being mixed with the alcohol and/or water and/or 6-aminocapric acid nitrile before being fed into reactor (B), and then analogously to step (b) caprolactam is produced by distillation; and either (d1) the bottom product from step (b) is fed into reactor A of step (a); or (d2) optionally water and possibly a low-boiling or a high-boiling alcohol are added to the bottom product which then, analogously to step (a) is heated in a reactor (C) to give a reaction product which is distilled to yield caprolactam; or (d3) water is added to the bottom product which is heated in a reactor (D) without added catalyst to give a reaction product which is distilled to yield caprolactam; or (d4) water and a base are added to the bottom product which is heated in reactor (E) to give a reaction product which is distilled to yield caprolactam.
Abstract:
A process is proposed for the production of cyclic lactams by allowing aminocarboxylic acid nitriles to react with water in the presence of catalysts. The reaction takes place in the fluid phase in a fixed bed reactor in the presence of heterogeneous catalysts, no constituents of which are soluble under these reaction conditions.
Abstract:
Processes are disclosed for the conversion of adipic acid to caprolactam employing a chemocatalytic reaction in which an adipic acid substrate is reacted with ammonia and hydrogen, in the presence of particular heterogeneous catalysts and employing unique solvents. The present invention also enables the conversion of other adipic acid substrates, such as mono-esters of adipic acid, di-esters of adipic acid, mono-amides of adipic acid, di-amides of adipic acid, and salts thereof to caprolactam. Solvents useful in the process that do not react with ammonia are also disclosed. Catalyst supports are disclosed which catalyze the reaction of the substrate with ammonia in the absence of added metal. Metals on the catalyst supports comprise ruthenium (Ru), rhodium (Rh), palladium (Pd), osmium (Os), iridium (Ir), and/or platinum (Pt). Heterogeneous catalysts comprising ruthenium (Ru) and rhenium (Re) on titania and/or zirconia supports are also disclosed. Further, disclosed are products produced by such processes, as well as products producible from such products.
Abstract:
La présente invention concerne un procédé de préparation de lactames par hydrolyse cyclisante d'aminonitrile correspondant. L'invention se rapporte à un procédé de fabrication de lactame par réaction d'un aminonitrile avec de l'eau en présence d'un catalyseur consistant à mettre en contact en phase vapeur, de l'eau et l'aminonitrile, à faire passer le mélange de vapeurs à travers un lit de catalyseur disposé dans au moins un tube formant un réacteur et à récupérer le lactame en sortie du tube.
Abstract:
The invention relates to a method for preparing e-caprolactam comprising deacylating N-acyl-6-aminocaproic acid and forming e-caprolactam. The deacylation may be carried out chemically or biocatalytically. The invention further relates to a host cell, comprising a recombinant vector comprising a nucleic acid sequence encoding an enzyme capable of catalysing the formation of 6-aminocaproic acid from N-acyl-6- aminocaproic acid.
Abstract:
La présente invention concerne un procédé de fabrication de lactames. Elle concerne plus particulièrement un procédé de fabrication de lactames à partir de composés alkylcyanovalérates obtenus en utilisant comme matières premières notamment des composés mononitriles insaturés, et plus particulièrement des pentènenitriles tels que les 2-, 3-, 4-pentènitriles pris isolément ou en mélange et appelés ci-après PN pour le mélange et respectivement 2PN, 3PN, et 4PN. Ce procédé consiste à réaliser l'hydrogénation et la cyclisation de l’alkylcyanovalérate en ε-caprolactame sans séparation intermédiaire de l'akylaminocaproate.