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/m 3 ) 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 m 3 /s) of the reaction mixture that is fed into the tube and A is the cross section area of the tube (in m 2 ) 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 =供给到管的反应混合物的密度(以kg / m 3)。 V =反应混合物的速度,V定义为W / A,其中W是进料到管中的反应混合物的流速(m 3 / s),A是所述反应混合物的横截面积 管(m 2),其中所述通道打开到管中。 D =所述通道打开到管中的管的直径(m)。 eta =进料到管中的反应混合物的粘度(Pa.s)。
Abstract:
La presente invención refiere a la obtención de la ε-caprolactama por tralamiento de la oxima de la ciclohexanona con sales derivadas del catión guanidinio, y en particular con el tosilato de cianoguanidinio ([CNG][TsO]). Esta sal es también objeto de invención de la presenta solicitud. La e-caprolactama es el precursor directo de la fibra poliamidica denominada "nylon-6", transformándose en dicha fibra mediante una reacción de polimerización.
Abstract:
The invention relates to a method for preparing a lactam in a continuous process, comprising forming the lactam and ammonium sulphate by contacting a lactam sulphate contained in an acidic liquid with ammonia, during which forming of lactam heat of reaction is generated, which heat is partially or fully recovered, wherein ammonia is brought into contact with the acidic liquid as part of a liquid aqueous ammonia solution, and wherein the contacting takes place at a temperature of at least 120 °C, and wherein the average residence time at a temperature of at least 120 °C is at most 15 minutes, and wherein the ammonium sulphate remains dissolved in a liquid phase during said residence time.
Abstract:
Method for preparing hydroxylamine in a continuous process, comprising hydrogenating nitrate in a reaction zone comprising a liquid phase, a gas phase and a heterogeneous hydrogenation catalyst, in which reaction zone hydroxylamine and nitrous oxide (N20) are formed, characterized in that the nitrous oxide concentration in the gas phase, is monitored and is maintained within a predetermined range by means of controlled addition of a promoter for the heterogeneous hydrogenation catalyst and/or controlled addition of further amounts of heterogeneous hydrogenation catalyst to the reaction zone; a method for preparing an oxime and a method of preparing a lactam comprising said method for preparing hydroxylamine.
Abstract translation:在连续方法中制备羟胺的方法,包括在包含液相,气相和异相氢化催化剂的反应区中使硝酸盐氢化,其中反应区羟胺和一氧化二氮(N 2 O 2)形成,其特征在于一氧化二氮 通过控制加入非均相氢化催化剂的促进剂和/或将另外量的非均相氢化催化剂加入到反应区中来监测气体中的浓度并保持在预定范围内。 制备肟的方法和制备内酰胺的方法,包括所述的制备羟胺的方法。
Abstract:
La présente invention concerne un procédé de préparation du lauryllactame dans lequel on effectue un réarrangement de Beckmann de la cyclododécanone oxime. Ce procédé est effectué en phase gazeuse, à une température comprise entre 180 et 45O °C et en présence d'un matériau microporeux ayant une structure principale inorganique à 3 dimensions composée de tétraèdres liés par une arête commune, appelé zéolithe.
Abstract:
The invention relates to a continuous process for preparing caprolactam by Beckmann rearrangement of cyclohexanone oxime, said process comprising a) feeding (i) oleum and (ii) cyclohexanone oxime into a first reaction mixture comprising caprolactam, sulfuric acid and SO 3 , b) feeding (iii) a portion of the first reaction mixture and (iv) cyclohexanone oxime into a second reaction mixture comprising caprolactam, sulfuric acid and SO 3 , c) withdrawing a portion of the second reaction mixture, wherein the process further comprises obtaining the cyclohexanone oxime that is fed to the reaction mixtures by: 1) preparing an organic medium comprising cyclohexanone oxime dissolved in an organic solvent 2) separating, by distillation, cyclohexanone oxime from said organic medium.
Abstract:
A process for efficiently and continuously producing a lactam in high-temperature high-pressure water, characterized by comprising: introducing an oxime as a substrate and an acid into a reaction zone through which high-temperature high-pressure water is flowing or introducing an oxime into high-temperature high-pressure water which contains an acid and is flowing; and thereby elevating the temperature of the substrate in a short time under the given high-temperature high-pressure conditions and reacting it to efficiently synthesize a lactam while inhibiting hydrolysis of the oxime. In the process, a lactam can be efficiently and continuously synthesized at a high rate from an oxime with the aid of an acid catalyst in high-temperature high-pressure water having a temperature of 250 DEG C or higher and a pressure of 15 MPa or higher.
Abstract:
The invention related to a modified polylactam containing recurring units of lactam and minor amounts of a lactam derivative having one or more non-polymerisable functional groups directly or indirectly attached to the carbon atoms of the lactam ring and wherein the functional group comprises a heteroatom. The invention further relates to a process for the preparation of the polylactam, to the use of the modified polylactam, to fibres made from the modified lactam and to the lactam derivative and its production.