88 results about "O-nitroaniline" patented technology

The invention discloses a method for separating nitrochlorobenzene meta-position oil, which comprises the following steps of: adding nitrochlorobenzene meta-position oil and aqueous ammonia into an autoclave, heating in the autoclave, and keeping the reaction temperature and the reaction pressure after the reaction starts; slowly reducing the pressure and reducing the temperature after the reaction is completed, and reclaiming ammonia during reducing the pressure and the temperature; pressing the reacted materials to a demixing tank, standing and demixing, and delivering the lower oil material phase to an intermediate tank; pumping the oil phase material in the intermediate tank into a vacuum light component removal tower, removing un-reacted meta-nitrochlorobenzene from the top of the tower, reclaiming the meta-nitrochlorobenzene, recovering a mixed material containing p-nitroaniline and o-nitroaniline from the autoclave, and feeding the mixed material into a mixing tank; and pumping the material in the mixing tank into a vacuum falling film rectifying tower, recovering the o-nitroaniline from the top of the tower, collecting the cooled o-nitroaniline, recovering the p-nitroaniline from the autoclave, and collecting the cooled p-nitroaniline. By the method, the problem of difficult treatment of much wastewater caused by washing with a large amount of water in the conventional production process is solved, and the qualities of the obtain p-nitroaniline and the obtained o-nitroaniline are improved.

The invention discloses a medical high-temperature-resistant antistatic film and a preparation method thereof. The high-temperature-resistant antistatic film comprises the following components in parts by weight: 30-40 parts of PE (polyethylene), 20-30 parts of PU (polyurethane), 20-30 parts of PC (polycarbonate), 5-10 parts of phenol formaldehyde resin, 5-10 parts of PC, 1-5 parts of p-chloro-o-nitroaniline, 3-8 parts of diethyl phosphite, 0.8-2 parts of antistatic agent, 0.5-2 parts of antioxidant, 0.5-1 part of ultraviolet absorbent, 3-9 parts of pentaerythritol, 2-6 parts of methyl acrylate and 1-3 parts of barium stearate. The preparation method comprises the following steps: adding all the components into a reaction kettle, stirring to react while heating in an ammonia gas environment to obtain a reaction product, carrying out extrusion granulation on the reaction product by a double screw extruder to obtain a master batch, and finally, carrying out extrusion and film blowing on the master batch by a plastic film blowing machine. The high-temperature-resistant antistatic film disclosed by the invention has favorable temperature resistance and antistatic property, and can be better applied to the field of medical treatment.

The present invention provides a material layering process for reduced o-phenylenediamine. The process comprises: firstly, mixing o-nitrochlorobenzene and ammonia to acquire o-nitroaniline; then adding sodium sulphide to the o-nitroaniline, wherein after reduction, a reduction pot contains a hydrate of a mother solution, o-phenylenediamine and a salt; and separating the o-phenylenediamine by using a two-stage separation technique. The present invention employs the self-developed technique for layering reduced o-phenylenediamine, thereby reducing the energy consumption, shortening the man-hour, reducing the rectification residues, providing the necessary condition for subsequent smooth rectification, and acquiring the o-phenylenediamine with high quality; providing a basis for increasing productivity of carbendazim; further improving the product quality of the o-phenylenediamine and the recovery rate in production process, reducing unit consumption, and reducing costs;and improving the operating environment and greatly reducing the labor intensity.

The invention discloses a synthesizing method of a carbolin compound. The synthesizing method comprises the following steps of enabling pyridine derivatives, o-nitroaniline and o-nitroaniline derivative thereof to generate coupling and reduction reaction, or directly generate coupling reaction with benzotriazole; converting into a diazotized triazole intermediate; finally, treating the obtained intermediate after reaction under the action of a reagent, so as to obtain substituted carbolin. The synthesizing method has the characteristics that on the basis of the improved Graebe-Ullmann method,the reaction raw materials, reaction reagents and conditions are preferably selected; the selectivity of target products is enhanced, the reaction time is shortened, the reaction temperature is reduced, the number of impurities is fewer, the yield rate is high, and the like; the method is suitable for synthesizing the substituted alpha-carbolin and beta-carbolin, so as to provide a simple and reliable selection plan for the obtaining and utilization of the compound.

The invention discloses a method for treating p-chloro-o-nitroaniline wastewater, which is characterized by comprising the following steps of: treating ammoniac p-chloro-o-nitroaniline wastewater to be transparent by using an activated carbon tower, adding quick lime into a replacement reaction kettle, controlling the temperature to be 120 DEG C, reacting for 2 hours and removing free ammonia and ammonia which exists in the form of ammonium chloride. The invention has the advantage that the method is suitable for treating the p-chloro-o-nitroaniline wastewater with different concentration. The ammoniac p-chloro-o-nitroaniline wastewater is treated to be transparent by using the activated carbon tower, the quick lime is added into the replacement reaction kettle, and the free ammonia and the ammonia which exists in the form of the ammonium chloride are removed. The total content of the ammonia in the wastewater is reduced while the ammonia is recovered.

The invention relates to the technical field of veterinary drug synthesis, and provides a preparation method of mequindox. According to the invention, o-nitroaniline and acetylacetone are used as raw materials, mequindox is prepared through an oxidation reaction and a condensation reaction, and the oxidation reaction is carried out under the conditions of an oxidizing agent, a dispersing agent and a catalyst; the dispersing agent can make the solution more uniform, and after the oxidation reaction is completed, benzofurazan does not need to be separated, and the next condensation reaction is directly carried out, so production procedures are reduced, and production efficiency is improved; a KOH / eggshell compound is used as the catalyst, KOH is adsorbed in eggshells and can be slowly released in a reaction process, so the KOH has a slow release effect, and the action time of the catalyst is prolonged; and the waste eggshells are used as a catalyst carrier, so a material source is rich, cost is extremely low, and the catalyst is green and environment-friendly.

The invention discloses a method for separating nitrochlorobenzene meta-position oil, which comprises the following steps of: adding nitrochlorobenzene meta-position oil and aqueous ammonia into an autoclave, heating in the autoclave, and keeping the reaction temperature and the reaction pressure after the reaction starts; slowly reducing the pressure and reducing the temperature after the reaction is completed, and reclaiming ammonia during reducing the pressure and the temperature; pressing the reacted materials to a demixing tank, standing and demixing, and delivering the lower oil material phase to an intermediate tank; pumping the oil phase material in the intermediate tank into a vacuum light component removal tower, removing un-reacted meta-nitrochlorobenzene from the top of the tower, reclaiming the meta-nitrochlorobenzene, recovering a mixed material containing p-nitroaniline and o-nitroaniline from the autoclave, and feeding the mixed material into a mixing tank; and pumping the material in the mixing tank into a vacuum falling film rectifying tower, recovering the o-nitroaniline from the top of the tower, collecting the cooled o-nitroaniline, recovering the p-nitroaniline from the autoclave, and collecting the cooled p-nitroaniline. By the method, the problem of difficult treatment of much wastewater caused by washing with a large amount of water in the conventional production process is solved, and the qualities of the obtain p-nitroaniline and the obtained o-nitroaniline are improved.

The invention provides a method for synthesizing a bis-benzimidazole compound through a one-pot method.According to the method, a bis(ortho-nitroaniline) compound shown in a formula II-1 or II-2 or II-3 and alcohol shown in a formula III are used as raw materials, water and organic solvent are added, and under the effect of a load type multi-metal solid catalyst, the bis-benzimidazole compound shown in the corresponding formula II-1 or II-2 or II-3 is synthesized through the one-pot method, wherein X1, X2, X3, X4, X5, X6, X7 and X8 are H, F, C1, CH3, CH2CH3 and OCH3 or OCH2CH3 independently; X9 is O or CO or CH2 or NH; R1 is H or alkyl or phenyl or alkyl phenyl or alkoxy phenyl, and the number of carbon atoms of alkyl and alkoxy is 1-3; in Y1 and Y2, Y3 and Y4, Y5 and Y6, Y7 and Y8, Y9 and Y10, and Y11 and Y12, one in each group is amino, and the other in each group is nitryl.The method has the advantages that the synthetic route technology is simple, the product yield is high, the production cost is low, the catalyst is easy to separate, high in activity and good in stability, and liquid acid is not used.