42 results about "Nitrocyclohexane" patented technology

The invention relates to a method for the high-selectivity co-production of nitrocyclohexane and adipic acid, which adopts nitrogen oxide NOx as the nitrating and oxidizing agent, carrys out continuous gas-phase catalysis or non-catalytic nitration and oxidation reaction on cyclohexane. By effectively setting the conditions of the concentration ratio, the reaction temperature and the reaction time of the reactants and optimizing the reaction pressure as well as catalysts and assistants, the invention realizes the simultaneous high-selectivity co-production of the nitrocyclohexane and the adipic acid of different ratios, and the reduction product NO generated by the nitration and oxidation reaction can be recycled for cyclic utilization. The method of the invention has high resource efficiency, less waste generation, simple process flow and device and low production cost, and is an environment-friendly synthetic method.

The invention discloses a process for synthesizing nitrocyclohexane by liquid phase nitration. The process comprises the following steps: feeding cyclohexane, nitric acid, distilled water and an acidic ionic liquid catalyst into a high-pressure reaction kettle, wherein the mole ratio of the cyclohexane to the nitric acid to the distilled water to the acidic ionic liquid catalyst is 1:1:12:(0.025-0.1), the reaction temperature is 115-135 DEG C, the reaction time is 6-24 hours, and the nitrocyclohexane is finally prepared. The mass percentage of the nitric acid is 65-68%. The acidic ionic liquid catalyst is a quaternary ammonium salt acidic ionic liquid catalyst which is prepared from a tertiary amine compound and acid in a one-step neutralization synthesis mode, or is a functionalized quaternary ammonium salt acidic ionic liquid catalyst which is synthesized from the tertiary amine compound and the acid in alkylation and neutralization two-step synthesis modes. The acidic ionic liquid catalyst for synthesizing the nitrocyclohexane from cyclohexane by liquid phase nitration has high catalysis activity, and meanwhile the function of a phase transfer catalyst is achieved, the reaction temperature is low, and no organic solvents are added.

The invention relates to a polyvinylidene fluoride / gold nanoparticle hybrid hollow fiber membrane and a preparation method thereof. With combination of hydrophilicity of a polymer gel, high catalytic activity of gold nanoparticles, and corrosion resistance and good film-forming property of polyvinylidene fluoride, the hybrid hollow fiber membrane with good anti-pollution ability, high catalytic activity and good separation property is prepared. The hollow fiber membrane can be used for catalyzing a reduction reaction of nitro in amino nitrobenzene, nitrophenol, nitrobenzene, methyl nitrobenzene, dimethyl nitrobenzene, cyano nitrobenzene, chloronitrobenzene, vinyl nitrobenzene, nitrocyclohexane and other molecules to transform nitro into amino. At the same time, the hollow fiber membrane also can be used for separation of different-size substances in a liquid mixture.

The invention provides a method for synthesizing caprolactam in one step by liquid phase hydrogenation of nitrocyclohexane, wherein caprolactam is synthesized in one step setting out from nitrocyclohexane and under the action of hydrogen pressure of 0.1-2.0MPa and a composite catalytic system; and the composite catalytic system is the supported catalyst and the mixture composed of triazine compounds and formamide compounds. The method of the invention has temperate reaction conditions and simplifies the technology substantially.

The invention discloses a method for preparing cyclohexanone oxime by catalytic transfer hydrogenation of nitrocyclohexane. According to the mass ratio of 0.1~0.4:1:2~20.8, the present invention adds activated carbon supported by catalyst copper nickel, nitrocyclohexane, amine borane compound into the reactor; reacts at 50~80°C for 6~ The obtained reaction solution was obtained after 12 hours; the obtained reaction solution was filtered and separated to obtain cyclohexanone oxime. The method uses the hydrogen storage material as the hydrogen donor to catalyze the hydrogenation reaction of nitrocyclohexane, and the preparation process can be completed through ordinary glass instruments, without the need for high-pressure reactors and other equipment, which reduces the cost of the reaction device and simplifies the reaction operation. The safety of the reaction process is increased.

The invention relates to a polyvinylidene fluoride / palladium nanoparticle hybrid hollow fiber membrane and a preparation method thereof. With combination of hydrophilicity of a polymer gel, high catalytic activity of palladium nanoparticles, and corrosion resistance and good film-forming property of polyvinylidene fluoride, the hybrid hollow fiber membrane with good anti-pollution ability, high catalytic activity and good separation property is prepared. The hollow fiber membrane can be used for catalyzing a reduction reaction of nitro in amino nitrobenzene, nitrophenol, nitrobenzene, methyl nitrobenzene, dimethyl nitrobenzene, cyano nitrobenzene, chloronitrobenzene, vinyl nitrobenzene, nitrocyclohexane and other molecules to transform nitro into amino. At the same time, the hollow fiber membrane also can be used for separation of different-size substances in a liquid mixture.

The application relates to the field of preparation of fluorescein probes with specific selectivity, and specifically discloses a preparation method of fluorescein probes with specific selectivity. The method comprises: (1) mixing 4-nitrophthalic anhydride, resorcinol, nitrocyclohexane and anhydrous cobalt chloride, heating and melting, adding zinc chloride, reacting, and then adding hydrochloric acid Reflux, filter and wash, dry; (2) will contain Na 2 S and Na 2 SO 3 The reducing solution is mixed with the product of step (1), reacted, and then glacial acetic acid is added dropwise until the precipitation is complete, filtered, washed, and dried; (3) the mixed solvent containing methanol and triethylamine is mixed with the product of step (2) Mix, add CS dropwise 2 , to react, then add copper chloride aqueous solution dropwise, continue the reaction after dropping, then adjust the pH value of the system to 1-2 with hydrochloric acid, distill under reduced pressure, wash, dry, and purify by column chromatography. The method greatly improves the conversion rate and yield of 5-fluorescein isothiocyanate.