2764 results about "Caprolactam" patented technology

The invention provides a method and device for preparing 6-amino-capronitrile from caprolactam by adopting a liquid phase method. In the method for preparing the 6-amino-capronitrile, the caprolactamis taken as a raw material; the method for preparing the 6-amino-capronitrile comprises the following step: S1: mixing the caprolactam, an organic solvent and a catalyst at a certain mass ratio, so asto obtain a mixed solution, adding the mixed solution into a reaction kettle and stirring and heating the mixed solution; S2: when the mixed solution in step S1 reaches certain temperature, introducing ammonia gas into the mixed solution for a reaction; S3, after the reaction in step S2 is ended, rectifying and purifying a reaction product, so as to obtain pure 6-amino-capronitrile. In the methodfor preparing the 6-amino-capronitrile, the caprolactam is taken as the raw material, the reaction conversion rate is comparatively high, and the preparation process is simple.

Aspects of the invention relate to methods for the production of difunctional alkanes in host cells. In particular, aspects of the invention describe components of genes associated with the difunctional alkane production from carbohydrate feedstocks in host cells. More specifically, aspects of the invention describe metabolic pathways for the production of adipic acid, aminocaproic acid, caprolactam, and hexamethylenediamine via 2-ketopimelic acid.

Disclosed is a polyamide molding compound having heat aging resistance for use as automobile or electrical components and composed of: (A) 27-84.99 wt % of a polyamide mixture consisting of (A1) at least one semiaromatic, semicrystalline polyamide having a melting point of 255° C. to 330° C., (A2) at least one caprolactam-containing polyamide that is different from (A1) and that has a caprolactam content of at least 50 wt %, where the total caprolactam content is 22-30 wt %, with respect to the polyamide mixture, (B) 15-65 wt % of at least one filler and reinforcing agent, (C) 0.01-3.0 wt % of at least one thermal stabilizer, and (D) 0-5.0 wt % of at least one additive, where the components (A)-(D) add up to 100 wt %.

The invention discloses a carbon-based nano cast nylon composite material and an in-situ polymerization preparation method thereof. The method is characterized by comprising the following steps of: heating a caprolactam raw material to between 70 and 120 DEG C for melting, adding carbon-based nano particles into the caprolactam melt in a weight ratio of the carbon-based nano particles to the caprolactam monomer of 0.1-5: 100, namely uniformly dispersing carbon-based nano particle graphite oxide or graphene into the caprolactam melt by using ultrasonic wave or in a grinding mode, heating the mixture to between 110 and 150 DEG C, dehydrating the mixture for 5 to 30 minutes under the vacuum of 0.05 to 0.098MPa, adding 0.1 to 1 weight part of catalyst and 0.1 to 1 weight part of cocatalyst into the mixture, casting the uniform mixture into a die preheated to between 150 and 180 DEG C, keeping the temperature for 30 to 60 minutes, and cooling the mixture to obtain the carbon-based nano cast nylon composite material. Compared with the carbon-based nano-free cast nylon material, the mechanical properties of the carbon-based nano cast nylon composite material such as tensile strength, tensile modulus, bending strength, elongation at break and the like are improved by 5 to 20 percent, and the abrasion resistance of the cast nylon composite material is improved.

A MFI-molecular sieve catalyst for preparing caprolactam from cyclohexanone oxime by gas-phase Beckmann rearrangement is prepared through proportionally mixing MFI-molecular sieve with alkaline silica gel, shaping, drying and calcining. It has high conversion rate and selectivity.

PCT No. PCT/EP96/05514 Sec. 371 Date Nov. 13, 1998 Sec. 102(e) Date Nov. 13, 1998 PCT Filed Dec. 10, 1996 PCT Pub. No. WO90/21758 PCT Pub. Date Jun. 19, 1997A process and device for the standardised continuous production of polyamide 6, polyamide 6.6 and/or copolyamides from e-caprolactam and/or adipic acidic hexamethylenediamine or adipic acid and hexamethylenediamine uses a combination of known specific processes to design a polymerisation reactor in which product with sufficiently high quality can be produced with the most efficient possible use of the energy applied and in such a way that the initial substances can be used alternately in the individual processing stages: pre-heating of the initial products using a common heat exchanger to 190-300 DEG C.; polymerisation of the initial products in a pressure stage with or without elimination of water and product recycling at 150-280 DEG C. and a pressure of <20 bar, dewatering of the polymer melt in a one to five turn coil under slow pressure reduction; and final condensation of the melt in at least one common vertical reactor at temperatures of between 210 and 285 DEG C.

A structural formula of a 6-aliphatic hydrocarbon amido hexyl hydroximic acid collecting agent is represented by a formula (I), wherein R represents C2-C18 aliphatic hydrocarbon group. The preparation method comprises the steps as follows: caprolactam and hydroxylamine hydrochloride or hydroxylamine sulphate are taken as raw materials, methylbenzene is taken as a solvent, the reaction temperature ranges from 80 DEG C to 110 DEG C, the reaction lasts for 1-4 hours, and 6-amino hexyl hydroximic acid is generated; 6-amino hexyl hydroximic acid reacts with C2-C18 fat carboxylic acid at the reaction temperature ranging from 100 DEG C to 160 DEG C for 1-4 hours to generate 6-aliphatic hydrocarbon amido hexyl hydroximic acid, and the product yield can be higher than 91%; and 6-aliphatic hydrocarbon amido hexyl hydroximic acid used in flotation of scheelite, wolframite, tombarthite ore, tin ore, bauxite, titanic iron ore or fluorite ore is taken as the collecting agent, so that the flotation recovery rate can be increased by 3%-10%.

The invention discloses a compound low dosage natural gas hydrate inhibitor. The hydrate inhibitor benchmarked against the mass of water in a deepwater drilling fluid completion fluid comprises, by mass, 0.1-2% of a hydrate kinetic inhibitor, 0.1-2% of a kinetic inhibitor synergist and 0-10% of a hydrate thermodynamic inhibitor. The hydrate kinetic inhibitor is at least one of polyvinyl pyrrolidone, polyvinyl caprolactam, and a copolymer generated through a reaction of vinyl pyrrolidone, vinyl caprolactam, alkenyl sulfonic acid and isopropylmethacrylamide. The kinetic inhibitor synergist is at least one of benzyltributylammonium chloride, tetraheptylammonium bromide, ethylene glycol phenyl ether, propylene glycol phenyl ether, polyoxyethylene and polyoxypropylene. The hydrate inhibitor can effectively inhibit generation of hydrates under a low dosage (0.2-10%), is suitable for deepwater and ultra-deep water drilling and completion, greatly reduces the cost and the logistical support burden, and has small harms to environment.

The invention discloses a monomer casting nylon composite which is prepared through the catalytic polymerization of caprolactam doped with graphene, wherein the weight ratio of caprolactam to graphene is 100:(0.005-0.095). The invention has the following beneficial effect: the dosage of graphene in caprolactam is changed, thus the mechanical properties and friction performances of the polymerizedmonomer casting nylon can be increased, particularly the impact resistance and wear resistance can be greatly increased, the impact strength is 2-4 times that of the material prepared by the prior art and the volume erosion rate is 7.7%-26.8% of that of the material prepared by the prior art. Therefore, the composite can be used to prepare workpieces with wider application range.

The invention relates to a fiber-reinforced modified-reaction injection-molding nylon sheet and a preparation method thereof, belonging to the field of composite material preparation. An amide monomer is used as a basal raw material; a catalyst, an auxiliary catalyst, an auxiliary antioxidant, a stabilizing agent, a surface conditioning agent, and the like are added; and the materials are injected into a high-temperature mold cavity with preset fibers by an RIM and thermally pressed and molded to prepare the reinforced modified-reaction injection-molding nylon sheet. The prepared sheet comprises the following ingredients by mass percentage: 30 to 95 of amide monomer, 3 to 70 of fiber, 0.01 to 2 of catalyst, 0.01 to 10 of auxiliary catalyst, 0.1 to 2 of antioxidant, 0.1 to 2 of stabilizing agent and 0.1 to 1 of surface conditioning agent, wherein the amide monomer is caprolactam or dodecalactam, the fiber is one of glass fiber, carbon fiber or aramid fiber and is in the form of fiber cloth, short-cut fiber or compound fiber. Compared with common reaction injection nylon and monomer cast nylon sheets, the reaction injection-molding nylon sheet has stronger carrying capability, low manufacture cost and easy popularization and application.

The invention provides a method for producing caprolactam by taking high-purity benzene as a raw material, and the method comprises the following steps of: A. preparing cyclohexene from the raw material benzene through hydrogenation; B. separating and purifying cyclohexene; C. carrying out hydration on the cyclohexene for preparing cyclohexanol; D. separating and purifying cyclohexanol; E. carrying out dehydrogenation on cyclohexanol for preparaing cyclohexanone; F. refining cyclohexanone; G. carrying out oximation on cyclohexanone so as to prepare cyclohexanone-oxime; H. refining cyclohexanone-oxime; I. carrying out rearrangement on refined cyclohexanone-oxime so as to prepare caprolactam; and J. refining caprolactam, wherein the high-purity benzene is adopted as a raw material, so that the purity of benzene is more than 99.95%, the sulphur content is less than 5ppm, and the methylbenzene is not more than 100ppm. The method has the beneficial effects that the high-purity benzene is adopted as a raw material, so that the impurity is less, and the product quality is high; the raw material is high in comprehensive utilization rate and low in hydrogen consumption; and the mass of the raw material and intermediate products generated in all the steps of reaction can be strictly controlled, so that the direct commercial value of the intermediate products is fully exerted, and the optimal quality of the product caprolactam can be reached.

The present invention provides a preparation method of high-temperature nylon, including the following steps: (a) dicarboxylic acid and diamine are used to prepare 6T salt or 6I salt under the temperature of 80 to 110 DEG C and the carbon atomicity n of the obtained paraphthaloyl acidhexamethylene diamine salt or m-phthalic acryl acidhexamethylene diamine salt is 4 to 16; (b) 6T salt or 6I salt obtained in step (a) and 66 salt or hexanolactam are polymerized to obtain primary condensation compound and the characteristic viscosity of the primary condensation compound in dense sulfuric acid is 0.09 to 0.25dl/g under the temperature of 30 DEG C; (c) the primary condensation compound obtained in step (b) is under solid phase condensation and polymerization to obtain the high-temperature nylon under the temperature of not more than 250 DEG C. The method provided by the present invention can increase the polyamide size stability, mechanic performance and heat resistance, reduce the molecular weight distribution of the high-temperature nylon, and prevent the occurrence of amine exchange, thermal degradation, gelation and other side reactions.

The invention discloses a graphene/nylon 6 fiber with flame-retarding and ultraviolet-proof properties and a preparation method of the graphene/nylon 6 fiber and belongs to the technical field of functional high molecular materials. The graphene/nylon 6 fiber with the flame-retarding and ultraviolet-proof properties is prepared through high-speed melting spinning of a graphene/nylon 6 nano composite material; the graphene/nylon 6 nano composite material is prepared by compounding modified graphene, caprolactam and various auxiliary agents. The graphene/nylon 6 nano composite material obtained by the invention can continuously pass through a melting spinning hole at a high speed and continuous high-speed spinning is realized; the diameter of the fiber is 5mum to 50mum; compared with a pure nylon 6 fiber, the prepared graphene modified nylon 6 fiber has excellent flame-retarding, melt-dripping-resisting and ultraviolet-proof performances and the like.

The invention relates to flame-retarded polyamide 6 and a preparation method thereof. The preparation method comprises the steps of firstly obtaining flame retardant salt through reaction between a DOPO-based reaction type phosphorus-based flame retardant and diamine; then adding an addition type phosphorus-based flame retardant, the flame retardant salt and other components during a process of polymerizing caprolactam into polyamide 6 so as to prepare the flame-retarded polyamide 6, wherein a molecular chain of the flame-retarded polyamide 6 is formed by a polyamide chain segment and a DOPO-based reaction type phosphorus-based flame retardant chain segment; the content of phosphorus in the molecular chain is 0.4 to 0.8 percent by weight; and the molecular chain contains 3 to 9 percent by weight of the addition type phosphorus-based flame retardant. The flame-retarded polyamide 6 prepared through the invention has the limit oxygen index being larger than 29 percent, the tensile strength ranging from 55 to 69MPa, the elongation at break ranging from 40 to 110 percent, can become gears, bearings, automobile parts and other products through injection molding and other methods, and can also be prepared into polyamide 6 fiber so as to be further processed to be textile, military fabrics, equipment and the like.