11 results about "O-nitroaniline" patented technology

The invention relates to an environment-friendly stripping agent of photosensitive ink for electroplating shielding, and belongs to the technical field of stripping agents. The preparation method comprises the following steps: carrying out nucleophilic addition on phosphorous acid and diethylene glycol monobutyl ether to obtain a modified precursor containing a phosphoester structure, carrying out Michael addition on the modified precursor and ortho-aminophenol to obtain a modified monomer, carrying out diazotization reaction on the modified monomer and ortho-nitroaniline, and then reducing to obtain the 2-(2-nitrophenyl)-1, 2, 4-thiadiazole. And finally, compounding the modified corrosion inhibitor with a stripping agent system, so as to obtain the environment-friendly stripping agent for the photosensitive ink for electroplating shielding. The environment-friendly stripping agent of the photosensitive ink for electroplating shielding has the advantages of environment friendliness, no toxicity, high stripping efficiency, broad-spectrum corrosion inhibition and few surface residues.

The application discloses a method for preparing 2-nitro-2'-hydroxy-5'-tert-octyl azobenzene in a water medium system. The method controls the molar dosage ratio of tert-octyl phenol and NaOH in an emulsification process, controls the mass concentration of tert-octyl phenol in an emulsion, controls the molar dosage ratio of o-nitroaniline and tert-octyl phenol, and controls the mass dosage ratio of an anionic high polymer surfactant and a non-ionic surfactant, so that 2-nitro-2'-hydroxy-5'-tert-octyl azobenzene with high purity is prepared. Compared with a traditional synthesis process, the method uses water as a reaction medium, avoids the use of an organic solvent, effectively reduces the difficulty in treating subsequent wastewater, and achieves a target product yield of more than 95% and a purity of 91.79%-94.52%.

This invention belongs to the field of organic chemical synthesis technology, specifically relating to a method for synthesizing 2-fluoro-3-aminobenzoic acid, an important chemical intermediate. Specifically, o-nitroaniline is condensed with hydrated trichloroacetaldehyde and hydroxylamine hydrochloride to obtain 2-(hydroxyimino)-N-(2-nitrophenyl)acetamide; the resulting product undergoes an intramolecular Beckmann rearrangement to generate 7-nitroindigo; 7-nitroindigo undergoes Bayer-Villedge oxidation to generate 2-amino-3-nitrobenzoic acid; 2-amino-3-nitrobenzoic acid undergoes diazotization and halogenation reactions to generate 2-fluoro-3-nitrobenzoic acid or 2-chloro-3-nitrobenzoic acid; 2-fluoro-3-nitrobenzoic acid can be further reduced by nitro to obtain 2-fluoro-3-aminobenzoic acid; or, 2-chloro-3-nitrobenzoic acid can be esterified to obtain 2-chloro-3-nitrobenzoic acid ester, which can then be fluorinated, saponified, and reduced to obtain 2-fluoro-3-aminobenzoic acid. The raw materials of this invention are low in cost and readily available, and the entire reaction route has specific regioselectivity, making it suitable for industrial production.

The application discloses a resin for adsorbing o-nitroaniline and a preparation method thereof, and belongs to the technical field of resin production. After polystyrene resin is subjected to a chloroacetylation reaction, the polystyrene resin is reacted with octadecylamine to graft long-chain alkyl, imino and carbon groups on the molecular chain structure of the polystyrene resin. The long-chain alkyl can form a network winding structure, facilitating the contact adsorption of the resin and o-nitroaniline and enhancing the hydrophobicity of the resin. Hydrophobic interaction and hydrogen bond interaction exist between the grafted polystyrene resin and o-nitroaniline, which can improve the adsorption performance of the resin on o-nitroaniline in wastewater, is beneficial to the recovery of o-nitroaniline in the wastewater and reduces the pollution caused by wastewater discharge.

The utility model discloses microwave vacuum drying equipment for ortho-nitroaniline, and belongs to the technical field of ortho-nitroaniline drying. The device comprises an outer machine shell, a feeding port is formed in one side of the outer machine shell, a sealing cover is movably hinged to one side of the feeding port, and a microwave generating device is fixedly arranged on the sealing cover; a crushing cylinder is rotationally arranged on the side, close to the feeding port, in the outer machine shell, the end, close to the feeding port, of the crushing cylinder is open, the other end of the crushing cylinder is blocked, screening holes are formed in the side wall of the crushing cylinder, the outer side of the crushing cylinder is slidably sleeved with a sealing cylinder, and the sealing cylinder is in sliding fit with the outer machine shell; a pushing mechanism used for pushing the sealing cylinder to move along the smashing cylinder is arranged on the outer machine shell. When the device is used, o-nitroaniline powder is heated through the microwave generating device, and the motor drives the crushing cylinder to rotate, so that the o-nitroaniline powder in the sealing cylinder can roll continuously, and the o-nitroaniline powder is uniformly heated.

The invention belongs to the technical field of organic synthesis, and discloses a preparation method of an intermediate 3, 4-diaminobromo-benzene, which comprises the following steps: S1, adding o-nitroaniline and a solvent, dropwise adding hydrobromic acid, dropwise adding hydrogen peroxide, carrying out heat preservation reaction, and treating after the reaction is completed to obtain a yellow solid; in the step S2, IM-1, a solvent, a catalyst and activated carbon are added, hydrazine hydrate is dropwise added, a stirring reaction is performed after dropwise adding, after the reaction is completed, activated carbon is filtered, the solvent is spin-dried, water is added for cooling, crystallization is performed, and a yellow solid is obtained through filtering. According to the method, o-nitroaniline is adopted as a starting raw material, and 3, 4-diaminobromo-benzene is prepared through hydrobromic acid substitution and hydrazine hydrate reduction. The invention discloses a drug molecule modular design, synthesis and optimization method based on molecular blocks, and aims to improve the research and development efficiency and molecular diversity of new drugs.

The application discloses a kind of o-nitroaniline production wastewater treatment processes, belong to wastewater treatment field, the device includes the following steps: step one: resin prewash, step two: resin preheating, step three: resin adsorption, the adsorption barrel in resin preheating is taken out, while o-nitroaniline wastewater is placed into a group of processing barrels, adsorption barrel is placed into a group of processing barrels to carry out adsorption to o-nitroaniline in the o-nitroaniline wastewater in processing barrel inside;Step four: resin desorption, methanol is added in processing barrel and is desorbed;By first prewashing macroporous resin, remove the impurities in macroporous resin, increase the adsorption state of macroporous resin, then preheat macroporous resin again, promote the expansion of the internal pore of macroporous resin, increase the specific surface area of resin, improve the adsorption capacity of resin, to improve the effect of macroporous resin on o-nitroaniline wastewater adsorption treatment.

The invention provides a method for continuously synthesizing o-phenylenediamine. The method comprises the following steps: step 1, filling a multistage tubular fixed bed reactor with a solid catalyst; 2, preheating a methanol solution of o-nitroaniline, sequentially passing through the multi-stage tubular fixed bed reactors, introducing hydrogen through aeration ports of the multi-stage tubular fixed bed reactors, fully mixing with the materials, and reacting for 1-10 hours at the temperature of 60-170 DEG C and the pressure of 0.7-2.5 MPa to obtain an o-phenylenediamine synthetic solution; and 3, continuously extracting an o-phenylenediamine synthetic liquid, and carrying out desolvation, light component removal and rectification to obtain an o-phenylenediamine finished product. The continuous synthesis method provided by the invention solves the problems of poor continuity, complex post-treatment process and the like of the existing synthesis process, and has the advantages of high catalytic efficiency, simple process flow and low catalyst consumption.

The invention discloses an o-phenylenediamine borane derivative as well as a preparation method and application thereof in treatment of morphine addiction, and the preparation method comprises the following steps: carrying out substitution reaction on an o-nitroaniline compound and 2-(N, N-dimethylamino) ethyl bromohydrobromide under the action of alkali to obtain a compound c; reducing nitryl by the compound c under the action of a reducing agent to obtain a compound d; and reacting the compound d under the action of BH3. THF to obtain the o-phenylenediamine borane derivative. Compared with DMT, the o-phenylenediamine borane derivative prepared by the preparation method disclosed by the invention has the advantage that the anti-neuroinflammation activity is remarkably improved.

The application discloses a kind of full continuous flow preparation methods of pyriproxyfen.The chloro o-nitroaniline solution and hydrogen are transported to fixed bed reactor to carry out continuous catalytic hydrogenation reaction, and the 4-chloro o-phenylenediamine reaction mixture obtained is transported to microchannel mixer and reactor with ethyl glyoxylic acid solution to carry out continuous cyclization reaction, and the 2-hydroxy-6-chloroquinoxaline suspension obtained is entered into continuous online filtering device, and the mixture is transported to micro-mixer and continuous flow reactor with phosphorus oxychloride by peristaltic pump, and the effluent reaction liquid and hydroquinone / catalyst mixture are transported to another fixed bed reactor to carry out continuous etherification;Reaction mixture and (S)-2-chloropropionic acid ethyl ester are entered into fixed bed reactor to carry out continuous etherification reaction;Product pyriproxyfen is obtained;Compared with traditional batch kettle type synthesis method, the method has short reaction time, high product yield, high degree of automation, high process continuous efficiency, high space-time yield, low energy consumption and easy industrial amplification application.

The application belongs to the technical field of organic synthesis, and particularly relates to a method for synthesizing 2-methyl-8-nitroquinoline. The method comprises the following steps: in an inert gas atmosphere, under the action of an oxidant, o-nitroaniline is first reacted with a protonic acid, and then an aldehyde compound is added to perform a condensation reaction, and 2-methyl-8-nitroquinoline is obtained. In the condensation process, the inert gas protection is adopted to avoid the generation of tar-like by-products in the reaction system, and the yield and purity of 2-methyl-8-nitroquinoline are improved. A new type of oxidant, such as 1,2-dinitrobenzene, dinitrobenzene, 3,5-dinitroaniline and 2,4-dinitroaniline, is adopted to avoid the participation of the substrate o-nitroaniline in the reaction as an oxygen source, and the yield and purity of the product are improved. Meanwhile, the oxidant itself is completely or partially generated into o-nitroaniline, which can be used as a substrate to react, and the yield of the product is further improved. The reaction condition is mild, raw materials are cheap, and the method is suitable for industrial production.