15 results about "P-Aminophenol" patented technology

The invention discloses a synthesis method of p-aminophenol derivatives, which comprises the following steps: dissolving a compound A in a mixed solvent of acetonitrile and water, cooling to 0-5 DEG C, then adding an organic and inorganic acid catalyst, reacting at room temperature, distilling to remove the solvent, and then adding citric acid to continuously react to obtain a compound B; the initial raw materials are simple and easy to obtain and easy to purchase and store on a large scale, and the synthesized p-aminophenol compound is high in purity and can meet the requirements of most industrial applications on product purity.

The application discloses an acid-resistant non-noble metal catalyst and a preparation method and application thereof, and particularly relates to the field of acid-resistant metal catalysts, and the preparation method of the acid-resistant non-noble metal catalyst comprises the following steps: step 1, preparation of a carrier; step 2, modification of the carrier; step 3, preparation of an impregnation solution; step 4, preparation of an unactivated catalyst; step 5, activation of the catalyst; and step 6, functionalization of the catalyst. The acid-resistant non-noble metal catalyst prepared by the application can be applied to the synthesis of p-aminophenol from nitrobenzene. The catalyst has good acid resistance and stability, and when applied to the process of preparing p-aminophenol by rearrangement of nitrobenzene hydrogenation, the catalyst has high activity and high selectivity of p-aminophenol under relatively mild reaction conditions, the production conditions are improved, the production cost is reduced, and the product quality is improved.

The invention belongs to the technical field of electrolytic synthesis, and particularly relates to a method for synthesizing p-aminophenol and persulfate. According to the application, a cathode electrocatalytic reduction synthesis process of p-aminophenol and an anode electrocatalytic oxidation synthesis process of persulfate are innovatively coupled, and the cathode current efficiency in the preparation process of p-aminophenol is effectively improved by regulating and controlling anode electrocatalytic temperature parameters. Performance test results show that the cathode current efficiency can reach 81.3%-89.82%, and compared with the cathode current efficiency of 80% or below in a conventional p-aminophenol preparation process, the technical breakthrough exceeding the expectation is achieved, and the unexpected technical effect is shown.

The application relates to application of a solid acid catalytic catalyst in preparation of p-aminophenol through nitrobenzene hydrogenation. The application comprises the following steps: adding a solid acid catalyst, cetyltrimethylammonium bromide, deionized water and nitrobenzene into a high-pressure reactor, and reacting under magnetic stirring for 0-24 hours at 25-150 DEG C to obtain the product p-aminophenol. The activated carbon for preparing the solid acid catalyst is coconut shell activated carbon, the series of activated carbon has the advantages of large specific surface area, rich micropores and strong adsorption capacity, and the coconut shell activated carbon solid acid with different acidities is prepared to catalyze the nitrobenzene hydrogenation reaction. The application avoids using traditional liquid acid sulfuric acid to provide the acidic active sites required by the reaction, greatly alleviates the problems of equipment corrosion, environmental unfriendliness, catalyst and product separation difficulty and the like. The catalyst used has good performance, the conversion rate of nitrobenzene is up to 100%, and the yield of p-aminophenol is up to 81.17%.

The invention belongs to the technical field of acetaminophen medicine synthesis, and particularly relates to a preparation method of acetaminophen, which is characterized in that acetaminophen and glacial acetic acid are subjected to one-step amidation reaction in a negative-pressure low-temperature reaction system to synthesize acetaminophen. The method solves the problems of high acetaminophen preparation temperature, easy raw material oxidation, low crude product quality, high cost and environmental protection potential safety hazard.

This invention provides a halogen-free resin composition and its applications. The halogen-free resin composition comprises the following components in parts by weight: 100 parts by weight of epoxy resin, including at least epoxidized polybutadiene resin; 50-100 parts by weight of p-aminophenol-modified maleimide resin, wherein the weight-average molecular weight of the p-aminophenol-modified maleimide resin is 500-800; and 70-90 parts by weight of benzoxazine resin. The halogen-free resin composition of this invention has a high heat resistance (Tg), excellent heat resistance, effectively reduces the warpage height of resin composition products, has a low coefficient of thermal expansion, and improves the reliability of laminated sheets with polyphenylene ether resin systems or hydrocarbon resin systems. It also provides excellent processability for prepregs and printed circuit board laminates.

The invention provides a preparation method of bio-based high-performance epoxy resin. The preparation method comprises the following steps: firstly, taking bio-based aldehydes and p-aminophenol as raw materials, and reacting at 50 DEG C for 3 hours to obtain a bio-based aldehyde Schiff base-containing compound; secondly, reacting the bio-based aldehyde compound containing the Schiff base with epoxy chloropropane at 80 DEG C for 6 hours to obtain a bio-based aldehyde epoxy monomer containing the Schiff base; methyl tetrahydrophthalic anhydride is used as a curing agent, and the bio-based aldehyde Schiff base-containing epoxy monomer and bisphenol A epoxy resin are mixed according to a certain proportion to obtain the bio-based high-performance epoxy resin. The bio-based aldehyde epoxy resin researched and developed by the invention not only has innovativeness in technology, but also has wide application potential in practical application. In the field of traditional electrical insulation, the method is expected to become a powerful competitor in the market, and provides beneficial reference for sustainable development and green chemistry.

The invention discloses application of a B-CDs (at) EuBTC composite material. The B-CDs (at) EuBTC composite material is used for qualitative and / or quantitative detection of p-aminophenol. The B-CDs (at) EuBTC composite material comprises a metal organic framework EuBTC and carbon dots loaded on the metal organic framework EuBTC, B-CDs represent blue light carbon dots, and BTC represents a ligand trimesic acid. The B-CDs (at) EuBTC composite material provided by the invention has excellent solvent stability, realizes ratio type fluorescence sensing on a biomarker p-aminophenol (PAP), has a detection limit of 0.65 mu M, and has the characteristics of good stability, high sensitivity, strong anti-interference performance, short response time and good cycle performance.

The application belongs to the technical field of electrochemical sensors, and discloses a kind of ion liquid gel microsphere composite electrode loaded with MXene and its preparation method and application in electrochemical detection of p-aminophenol.The preparation method is as follows: prepare a few-layer MXene aqueous solution, prepare PMMA / BMIMPF6 gel microsphere powder aqueous dispersion, add PMMA / BMIMPF6 gel microsphere dispersion to MXene aqueous solution, stir, ultrasonic oscillation, filter, wash, collect filter cake, freeze-drying to prepare PMMA / BMIMPF6 / MXene powder, take the above-mentioned powder and disperse it in anhydrous ethanol, ultrasonic oscillation, drop to carbon cloth, air dry, place at room temperature, make the electrode material and carbon cloth fully combined, and prepare PMMA / BMIMPF6 / MXene / CC composite electrode.The application not only provides a new electrochemical sensing scheme for efficient, rapid and economical detection of phenolic pollutants such as p-aminophenol in water environment, but also provides a new idea for the design and development of functional composite electrochemical electrode materials.

This invention relates to a method for synthesizing p-aminophenol type epoxy resin, belonging to the field of epoxy resin preparation technology. By adding n-butanol and / or cyclopentyl methyl ether to the reaction system, this invention can effectively reduce the total chlorine content of the p-aminophenol type epoxy resin product and improve its purity. The total chlorine content of the p-aminophenol type epoxy resin synthesized by this invention is less than 500 ppm. In this invention, n-butanol and cyclopentyl methyl ether are slightly soluble in water. During the cyclization reaction stage, when sodium hydroxide solution is used as a catalyst, n-butanol and cyclopentyl methyl ether can form a transition phase, promoting the uniform migration of sodium hydroxide from the aqueous phase to the interface between the two phases to participate in the reaction. This promotes the stable progress of the cyclization reaction, reduces the occurrence of side reactions, thereby reducing the total chlorine content of the p-aminophenol type epoxy resin and improving the synthesis yield of the p-aminophenol type epoxy resin.

The invention discloses a rectification system for treating p-aminophenol mother liquor and a rectification method thereof, and relates to the technical field of chemical separation. Comprising a rectifying tower, an evaporator, a reflux tank, a compressor, a feed preheater and a reboiler, p-aminophenol mother liquor is continuously fed into the rectifying tower at a middle feed port of the rectifying tower, a tower top outlet of the rectifying tower is connected with a shell pass inlet of the evaporator, and a shell pass outlet of the evaporator is connected with the reflux tank; a tower kettle of the rectifying tower is communicated with a tube pass of the reboiler, the evaporator, the compressor, the feeding preheater and the reboiler are sequentially connected through a closed-loop pipeline to form a closed heat pump circulation unit, a tube pass outlet of the evaporator is connected with a shell pass inlet of the reboiler through the compressor and the feeding preheater, and a tube pass outlet of the reboiler is connected with a tube pass outlet of the feeding preheater. A shell pass outlet of the reboiler is communicated with a tube pass inlet of the evaporator, and the temperature of a tower kettle of the rectifying tower is maintained at 75-80 DEG C. According to the invention, stable, efficient and energy-saving rectification at ultralow temperature is realized, and the product yield and quality are greatly improved.

The invention relates to a synthetic method of p-aminophenol epoxy resin, and belongs to the technical field of epoxy resin preparation. According to the method, n-butyl alcohol and / or cyclopentyl methyl ether are / is added into a reaction system, the total chlorine content of the p-aminophenol epoxy resin product can be effectively reduced, the purity of the product is improved, and the total chlorine content of the synthesized p-aminophenol epoxy resin is smaller than 500 ppm. According to the method, n-butyl alcohol and cyclopentyl methyl ether are slightly dissolved in water, in the cyclization reaction stage, when a sodium hydroxide solution serves as a catalyst, n-butyl alcohol and cyclopentyl methyl ether can form a transition phase, sodium hydroxide in a water phase is promoted to evenly migrate to a two-phase interface to participate in the reaction, the cyclization reaction is promoted to be stably carried out, side reactions are reduced, and the yield is increased. Therefore, the total chlorine content of the p-aminophenol type epoxy resin is reduced, and the synthesis yield of the p-aminophenol type epoxy resin is improved.

The present disclosure relates to a process for the preparation of p-aminophenol. The process of the present disclosure is simple, efficient, cost effective and commercially scalable. The process of the present disclosure provides p-aminophenol having a comparatively high selectivity and high yield.

The application belongs to the field of two-dimensional few-layer nanomaterial preparation and photocatalysis technology, and particularly relates to a preparation method of Bi2Ti2O7 / MXene two-dimensional composite few-layer material and application of the material in photocatalytic reduction of p-nitrophenol to p-aminophenol. The preparation method uses bismuth salt and titanium salt as raw materials, and polyhydric alcohol as a structure regulator. Bi2Ti2O7 two-dimensional few-layer material is prepared through hydrothermal reaction in an alkaline environment. Then, the surface of Bi2Ti2O7 is positively charged through surface protonation treatment, and the Bi2Ti2O7 is combined with MXene suspension through electrostatic interaction to construct two-dimensional composite few-layer material. The composite material has close interface contact and excellent photogenerated carrier separation efficiency, and exhibits significantly better catalytic activity than traditional morphology materials and simple mixed materials in the reaction of photocatalytic reduction of p-nitrophenol to p-aminophenol.

The present disclosure relates to a process for the preparation of p-aminophenol. The process of the present disclosure is simple, efficient, cost effective and commercially scalable. The present disclosure provides p-aminophenol having a comparatively high selectivity and high yield.