Abstract:
The present invention provides a method which can produce ε-caprolactam with a good selectivity by reacting cyclohexanone oxime with a good conversion in a vapor phase Beckmann rearrangement reaction. Disclosed is a method for producing ε-caprolactam, which comprises performing a vapor phase Beckmann rearrangement reaction of cyclohexanone oxime in the presence of a pentasil type zeolite, wherein the pentasil type zeolite is a zeolite obtained by subjecting a mixture containing a silicon compound, water, and a compound represented by formula (I): [(R1)3N+—(CH2)m—N+(R1)2—(CH2)m—N+(R1)3]·3/n (A) (I) wherein R1 represents an alkyl group having 1 to 4 carbon atoms, A represents an n-valent anion, m represents an integer of 5 to 7, and n represents an integer of 1 to 3, to a hydrothermal synthesis reaction.
Abstract:
Disclosed is a process for producing an amide or lactam in a high yield in a simple manner by allowing a rearrangement reaction of an oxime compound to proceed without causing large amounts of by-products such as ammonium sulfate.Specifically, disclosed is a process for producing an amide or lactam in which a corresponding amide or lactam is produced by rearranging an oxime compound in the presence of a compound containing a structure represented by following Formula (1): —Z—X (1) wherein Z represents P, N, S, B, or Si atom; and X represents a leaving group, where Z is bonded to one or more atoms or groups besides X. In the process, X may be a halogen atom.
Abstract:
Disclosed is a method for industrially efficiently producing a lactam compound having 8 to 15 carbon atoms at low cost by allowing a rearrangement reaction of a cyclic oxime compound to proceed without causing large amounts of by-products such as ammonium sulfate.[Solving Means] Disclosed is a method for producing a lactam compound, which includes the step of rearranging a cyclic oxime compound in a nonpolar solvent B in the presence of an aromatic compound A to give the lactam compound, in which the aromatic compound A has a leaving group bonded to a carbon atom constituting its aromatic ring and contains, as an atom constituting the aromatic ring, a heteroatom, or a carbon atom bonded with an electron-withdrawing group, the cyclic oxime compound is represented by following Formula (1): wherein “m” denotes an integer of 7 to 14, and the lactam compound is represented by following Formula (2): wherein “m” is as defined above.
Abstract:
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 at least one catalyst to the organic liquid to form a rearrangement mass, wherein the rearrangement mass comprises at least one amide, at least one impurity, and the at least one catalyst, and heating the rearrangement mass to a temperature of at least about 115° C. for a period of time in order to sulfonate, break down and/or reduce the concentration of some of the at least one impurity in the rearrangement mass.
Abstract:
The invention relates to a process for preparing caprolactam by admixture of cyclohexanone oxime to a reaction mixture comprising caprolactam and sulfuric acid using a mixing device, said mixing device comprising (i) a tube through which the reaction mixture can flow, and (ii) channels disposed around the tube, said channels opening into the tube, said process comprising: passing the reaction mixture through the tube, and feeding the cyclohexanone oxime into the reaction mixture through one or more of said channels, wherein Re>5000, Re being the Reynolds number as defined by ρ·V·D/η, wherein ρ=density (in kg/m3) of the reaction mixture that is fed to the tube V=velocity of the reaction mixture, V being defined as W/A, wherein W is the flow rate (in m3/s) of the reaction mixture that is fed into the tube and A is the cross section area of the tube (in m2) at the level where said channels open into the tube D=diameter of the tube at the level where said channels open into the tube (in m) η=viscosity of the reaction mixture that is fed into the tube (in Pa·s).
Abstract translation:本发明涉及通过使用混合装置将环己酮肟与包含己内酰胺和硫酸的反应混合物混合来制备己内酰胺的方法,所述混合装置包括(i)反应混合物可以流过的管,以及(ii)通道 所述方法包括:使反应混合物通过管,并通过一个或多个所述通道将环己酮肟进料到反应混合物中,其中Re> 5000,Re为雷诺数 其数值由rho.VD / eta定义,其中rho =加入到管中的反应混合物的密度(单位为kg / m 3)V =反应混合物的速度,V定义为 W / A,其中W是供给到管中的反应混合物的流速(以m 3 S / s),A为管的横截面积(m / 2)在所述通道打开到管中的水平面D =在其上的管的直径 所述通道通入管中(以m计)eta =进料到管中的反应混合物的粘度(Pa.s)。
Abstract:
ε-Caprolactam is produced by contacting cyclohexanone oxime with a solid acid catalyst in the gaseous phase to effect a rearrangement reaction of the cyclohexanone oxime. The solid acid catalyst is produced by calcining a dried catalyst precursor that can be a zeolite, a crystalline clay mineral and at least one substance selected from an inorganic oxide and a compound which forms the inorganic oxide by calcination. The inorganic oxide includes at least one element selected Groups 4, 13 and 14 of the Periodic Table, and the inorganic oxide excludes oxides contained in a crystalline form in the zeolite and the crystalline clay mineral. Alternately, the rearrangement reaction occurs in the presence of a polyhydric alcohol compound R1—O—R2—OH (where R1 represents C1-C5 alkyl or phenyl, and R2 represents C2-C5 alkylene).
Abstract:
A method is provided for producing &egr;-caprolactam from cyclohexanone oxime by using a zeolite or non-zeolitic material as a catalyst under gas phase reaction conditions. The method comprises a reaction step converting cyclohexanone oxime into &egr;-caprolactam in the presence of the zeolite or non-zeolitic material; and a regeneration step of treating the zeolite or non-zeolitic material with a non-oxidizing gas at a temperature of from about 100°C. to about 600° C.
Abstract:
A process is provided for producing &egr;-caprolactam from cyclohexanone oxime. The process comprises a evaporation step of a mixture of cyclohexanone oxime and a solvent by introducing the mixture into a fluidized bed in which inert particles is fluidized by an inert gas, the particles having heat enough to evaporate the mixture; and a rearrangement step of cyclohexanone oxime in the evaporated mixture into &egr;-caprolactam by a gas phase Beckmann rearrangement reaction using a solid catalyst, excluding a catalyst consisting of a boric acid or a boron oxide.
Abstract:
The present invention provides a method for producing .epsilon.-caprolactam, which comprises subjecting cyclohexene to a hydration reaction to obtain cyclohexanol, subjecting the cyclohexanol to a dehydrogenation reaction to obtain cyclohexanone, subjecting the cyclohexanone to an oxime-forming reaction to obtain cyclohexanone oxime, and subjecting the cyclohexanone oxime to a Beckmann rearrangement reaction to obtain .epsilon.-caprolactam, wherein methylcyclopentanones contained in the cyclohexanone subjected to the oxime-forming reaction are controlled to be not more than 400 ppm.According to the present invention, it is possible to produce .epsilon.-caprolactam having a quality not inferior to conventional quality at a low cost.
Abstract:
A process for the preparation of caprolactam by reacting cyclohexanone oxime with a cationic or nonionic surfactant and a cosurfactant in dilute sulfuric acid at a temperature in the range of 15.degree. C. to 40.degree. C., neutralizing excess acid present in the solution and recovering the caprolactam from the solution by filtration.