75 results about "N-hydroxyphthalimide" patented technology

The invention relates to a method for preparing keto-isophorone by the catalytic oxidation of a metal free co-catalyst system, which is characterized in that, Alpha-isophorone is used as the raw material; in the presence of an organic solvent, oxygen or an oxygen rich gas is used as an oxidant; under the effect of the co-catalyst system composed by the main catalyst N-hydroxyphthalimide and the analogues of N-hydroxyphthalimide, and organic cocatalyst, keto-isophorone is prepared by catalytic oxidation; reaction temperature ranges from 10 to 100 DEG C; reaction time ranges from 1 to 70 hours; keto-isophorone with high selectivity can be generated. The method has the advantages that, the catalyst is metal free, cheap and easy to be obtained; reaction conditions are mild; operation is simple; the product has high selectively and other advantages.

The invention relates to a method for preparing adipic acid by directly oxidizing cyclohexane. The problems of low cyclohexane conversion rate and low adipic acid yield of preparation of adipic acid by directly oxidizing cyclohexane in the prior art are mainly solved. The method for preparing adipic acid by directly oxidizing cyclohexane comprises is characterized in that adipic acid is obtained by oxidizing cyclohexane with an oxygen-containing gas as an oxidant in the presence of a solvent, a free radical catalyst, a metal catalyst and a cocatalyst; the solvent is at least one selected from acetic acid, acetonitrile and ethyl acetate; the free radical catalyst is at least one selected from NHPI (N-hydroxyphthalimide) and NAPI (N-acetoxylphthalimide); the metal catalyst is at least one selected from cobalt and manganese; and the cocatalyst is at least one selected from polyethylene glycol and crown ether. The method well solves the problems, and can be used in the industrial production of adipic acid.

A non-metallic catalytic system with pyramine compound, molecule bromine and N-hydroxy-o-dimethyl-acylimine is prepared by catalyzing aryl radical oxide with molecular oxygen as oxygen source to generate aryl ketone or aryl aldehyde under gentle condition and oxidation reacting selectively. It costs low, is non-toxic and has less environmental pollution.

The invention relates to a method for preparing p-methoxybenzaldehyde perfume in presence of metalloporphyrin through catalytic oxidation of p-methoxytoluene. The method comprises the steps of: by taking metalloporphyrin with the concentration of 10-100ppm as a catalyst, N-hydroxyphthalimide as a free radical initiator and, introducing oxygen under 0.1-1.0Mpa and reacting for 1-12h at 60-100 DEG C in an acetonitrile solvent to obtain p-methoxybenzaldehyde, wherein the molar ratio of N-hydroxyphthalimide to p-methoxytoluene is (0.01-0.1):1. The method has the advantages that the consumption of the catalyst is extremely low, separation and recovery are not needed, the catalyst is higher in activity and selectivity, and a reaction condition is mild. According to the method provided by the invention, not only can resources be utilized and saved effectively, but also environmental pollution is reduced and the purpose of reducing energy consumption is achieved to further realize energy saving and emission reduction in an all-round way, and thus, the method has a wide application prospect in the industry.

The invention discloses a preparation method and application of an immobilizedcatalyst which is applied to a hydrocarbon-oxidizing system, is easily separated from a reaction liquid and can be recycled. The preparation method for the immobilized catalyst is realized in such a way that two or more N-hydroxyphthalimide (NHPI ) derivatives are immobilized on a silicon-based mesoporous material through a silane coupling agent containing an epoxygroup by adopting a covalent chemical grafting method. The immobilized catalyst can be used for catalyzing hydrocarbon molecule oxygen to generate an oxidizing reaction under a mild condition and has higher activity and selectivity.

The invention belongs to the technical field of immobilized N-hydroxyphthalimide catalysts, and specifically relates to a preparation method of polymeric-microsphere-carrier immobilized N-hydroxyphthalimide catalyst. The preparation method is characterized in that intermediate product aldehyde group modified microsphere GMA / MMA-AL, modified microsphere GMA / MMA-PA bonded with a phthalic acid group and microsphere GMA / MMA-PPA loaded with phthalic anhydride PPA are prepared, and finally a functional microsphere loaded with N-hydroxyphthalimide functional microsphere group is obtained. With the preparation method provided by the invention, the efficient organic catalyst N-hydroxyphthalimide (NHPI) is easy to separate and can be reused, a system is easy to purity, and therefore, environment-friendly catalytic oxidation is realized.

The invention discloses a synthesis method of 2-amino-5-chloro-N,3-dimethylbenzamide, which belongs to the technical field of organic chemical synthesis. The present invention uses toluene as a raw material, first under the catalysis of N-hydroxyphthalimide and cobalt acetylacetonate, oxidizes to generate benzoic acid, then generates 3,5-dichlorobenzoic acid through a substitution reaction with chlorine, and then Shield the 5-position chlorine with a shielding reagent, use a Grignard reagent to replace the 3-position chlorine with a methyl group to generate 3-methyl-5-chlorobenzoic acid, and then nitro-substitute with nitric acid under the catalysis of concentrated sulfuric acid to generate 2-nitro ‑3‑methyl‑5‑chlorobenzoic acid, followed by catalytic hydrogenation to reduce the nitro group to an amino group, and finally in the action of N,N'‑diisopropylcarbodiimide and 1‑hydroxybenzotriazole The intermediate is obtained by reacting the intermediate with methylamine to obtain 2-amino-5-chloro-N, 3-dimethylbenzamide. The present invention is not only simple to operate, but also the synthesis yield has been significantly improved, reaching 92 %above.

The invention relates to synthesis and application of a novel catalyst used in preparation of arone by carrying out catalytic oxidation on ethylbenzene and a derivative of ethylbenzene. According to the synthesis, on the basis of a substrate being 16mmol of ethylbenzene or a derivative of ethylbenzene, 1-15mol% of novel catalyst with a double structure of N-hydroxyphthalimide (NHPI) and ketoxime is used as a catalyst; reaction is carried out in the presence of the novel catalyst without any catalyst promoter to obtain a main product acetophenone or other arones, wherein the oxygen pressure is 0.1-0.5 MPa, the reaction temperature is 20-100 DEG C, the reaction time is 1-12h, the ethylbenzene conversion rate is up to 80.5%,the selectivity of the product acetophenone is up to 92.3% and the yield can be up to 74.3%. The catalytic system used in the invention uses molecular oxygen as an oxidant, no catalyst promoter is added and the reaction conditions are mild, so that the cost is reduced, the yield is improved, the application range is wide and a good method is provided to the preparation of acetophenone or other arones.

The present invention provides an internal combustion engine which can produce several types of fuels from a single fuel as needed. The internal combustion engine comprises reforming means 3 for reforming a first fuel to be used in homogeneous charge compression ignition combustion into a second fuel having high ignitability, by making the first fuel contact with a catalyst formed from N-hydroxyphthalimide. The engine uses the second fuel when conducting diesel combustion. The engine can switch between the homogeneous charge compression ignition combustion with the use of the first fuel and the diesel combustion with the use of the second fuel. The engine conducts the homogeneous charge compression ignition combustion when a load is low, and conducts the diesel combustion when the load is high. The internal combustion engine further comprises a first fuel injector 4b which injects the first fuel to an air intake port when the homogeneous charge compression ignition combustion is conducted, and a second fuel injector 4a which directly injects the second fuel to a combustion chamber when the diesel combustion is conducted. The engine further comprises fuel injection timing control means 7 for switching between the homogeneous charge compression ignition combustion and the diesel combustion, by changing the injection timing of the fuel. The first fuel is at least one of gasoline, kerosene, light oil and alcohol.