17 results about "P-nitrobenzoic acid" patented technology

This utility model relates to the field of nitrobenzoic acid storage technology, and more particularly to a p-nitrobenzoic acid storage tank, including a tank body and a tank cover detachably connected to the upper end of the tank body, as well as a screw and a drive mechanism. One end of the screw is rotatably connected to the inside of the tank body, and a scraping element for scraping the inner wall of the tank body is threadedly connected to the screw. The scraping element is slidably connected to the inner wall of the tank body. The drive mechanism is located on the tank cover and is used to drive the screw to rotate, thereby scraping the inner wall of the tank body by the scraping element. In this utility model, when the tank cover is connected to the tank body, the drive mechanism drives the screw to rotate, and the screw rotation simultaneously drives the scraping element to slide up and down on the inner wall of the tank body, dynamically scraping off the material adhering to the inner wall of the tank body. At this time, the cleaning process in the closed state of the tank body can reduce the damage caused by manual cleaning of the inner wall of the tank body.

The invention belongs to the technical field of nano materials, and discloses a preparation method of a high-stability strong-chlorine-resistance MOF-based seawater electrolysis catalyst. The preparation method comprises the following steps: (1) treating product substrate foamed nickel; (2) preparing a synthetic material from ferric salt, nickel salt, p-toluic acid, p-nitrobenzoic acid, water, ethanol and N, N-dimethylformamide; and (3) synthesizing the final nitro functionalized NiFe-MOF-PNBA (at) NF through a hydrothermal method. When the electrocatalytic material is applied to an alkaline real seawater oxygen evolution reaction, the catalytic performance is better, and higher operation stability can be kept under high current density. In addition, the prepared catalyst also shows excellent electrolytic stability, and the stability can be maintained for more than 4000 hours under the current density of 1.5 A / cm < 2 >.

The utility model relates to the technical field of p-nitrobenzoic acid production, in particular to a p-nitrobenzoic acid production filtering device which comprises a sealable suction filtration container, the interior of the suction filtration container is divided into a filtering cavity located on the upper portion and a liquid storage cavity located on the lower portion, and a filtering layer is arranged in the filtering cavity. The suction filtration container is further connected with a vacuum pump through an exhaust pipe, the vacuum pump is used for forming a negative pressure environment in the suction filtration container, the pulse type negative pressure adjusting assembly comprises a first electromagnetic valve, a controller and a timer, the first electromagnetic valve is arranged on the exhaust pipe, and the controller is electrically connected with the first electromagnetic valve. According to the utility model, the pulse type negative pressure adjusting component is used for exhausting air, and the air is fed when the air exhausting is stopped, so that periodic negative pressure and positive pressure alternately act on the filter cake, periodic strain is generated in the filter cake, a compact layer on the surface of the filter cake generates microcracks due to repeated stress, and the filtrate permeability is improved.

The present invention relates to a process for preparing p-nitrobenzoic acid-2-ethyl hexylester comprising reacting p-nitrobenzoic acid, wherein an excess of 2-ethylhexanol acts as solvent and no additional solvent is added, or p-nitrobenzoic acid and 2-ethylhexanol are provided in equimolar amounts and no additional solvent is added, or 2-ethylhexanol is provided in substoichiometric amounts and no additional solvent is added. Further, the present invention relates to the p-nitrobenzoic acid-2-ethyl hexylester obtained by the process and having high purity and optimum product properties.

The invention relates to a lithium ion battery and a preparation method thereof. The lithium ion battery comprises a positive pole piece, a diaphragm, a negative pole piece and an electrolyte, the positive pole piece comprises a high-moisture-sensitive positive pole active material, the specific surface area of the positive pole active material is 5m / g-80m / g, and the residual moisture content of the dried positive pole piece is 200ppm-400ppm; the electrolyte comprises a lithium salt, a solvent, a film-forming agent, an auxiliary agent and a hydrogen elimination agent, the film-forming agent is prepared from 1, 3-propane sultone and 0.3 percent to 1.0 percent of ethylene sulfate; the auxiliary agent is tris (trimethylsilane) phosphate; the hydrogen eliminating agent is ammonium p-nitrobenzoate. The lithium ion battery can be compatible with the positive pole piece with relatively high residual moisture, and side reaction caused by the positive pole piece can be effectively inhibited through an electrolyte system with a special formula, so that excellent electrochemical performance and safety are obtained.

This utility model relates to the field of p-nitrobenzoic acid production technology, and in particular to a device for quantitatively dispensing raw materials for p-nitrobenzoic acid production. The device includes a mixed acid solution reactor, a nitration reactor, a staged cooling assembly, and a control mechanism. The mixed acid solution reactor is used to prepare a mixed acid solution of sulfuric acid and nitric acid. The nitration reactor is used to react the cooled mixed acid solution with toluene. The staged cooling assembly is connected between the output end of the mixed acid solution reactor and the input end of the nitration reactor, and is used to cool the mixed acid solution that needs to be quantitatively added to the nitration reactor. The control mechanism includes a controller and a temperature sensor. This utility model uses the staged cooling assembly to cool the mixed acid solution that needs to be quantitatively added to the nitration reactor in small batches, effectively avoiding the problem of cooling lag caused by large quantities of mixed acid solution and long cooling paths, and ensuring the temperature uniformity of the mixed acid solution.

The present invention provides a paroxysmal hemoglobinuria indication drug ipropam key intermediate synthesis method, and relates to the technical field of ipropam, the method comprises: taking p-bromobenzaldehyde as an initial raw material, adopting an organic catalyst to obtain an intermediate 03, carrying out protection group removal on the intermediate 03, carrying out automatic ring closing to obtain an intermediate 04, and carrying out post-treatment to obtain the paroxysmal hemoglobinuria indication drug ipropam key intermediate. Reducing the intermediate 04 with sodium borohydride to obtain a single cis-configuration intermediate 05, then carrying out a chiral flip reaction and hydrolysis to remove p-nitrobenzoic acid, then carrying out an etherification reaction with diethyl sulfate to obtain an intermediate 08, reducing amide of the intermediate 08 with sodium borohydride and boron trifluoride diethyl etherate to obtain an intermediate 09, then carrying out an acetylation reaction to protect amino, and finally carrying out a reaction to obtain the chiral cis-configuration intermediate 03. Cuprous cyanide is subjected to a cyanation reaction and a hydrolytic esterification reaction to obtain the ipropam key intermediate TM. The method is low in raw material price, high in chiral control selectivity, easy in reaction condition control and low in equipment requirement, avoids column chromatography and other operations, and is more suitable for industrial production.

The invention discloses a production system and a production method of medicinal p-aminobenzoic acid. The production system comprises a filter column, a hydrogenation reaction kettle, a catalyst filter, a tubular hydrogenation reactor, a fine filter and a crystallization kettle, the production method comprises the following steps: pumping p-nitrobenzoic acid and a solvent into a hydrogenation reaction kettle through a filter column, and reacting until 3-5% of raw materials are left; then pressing out the material from the hydrogenation reaction kettle, enabling the material to enter a tubular hydrogenation reactor through a catalyst filter for continuous reaction until the material is completely reacted, finally filtering the liquid material through a micro-filter, and enabling the liquid material to enter a crystallization kettle for crystallization. On one hand, a small amount of residual colored impurities, heavy metal impurities and insoluble tiny foreign matters in raw materials are removed by adopting a multi-effect filter column, and on the other hand, hydrogenation reaction is carried out by adopting a manner of connecting a kettle type reactor and a tubular reactor in series; the content of intermediate-state impurities in nitro reduction and the content of impurities in side reactions such as decarboxylation and polymerization can be effectively reduced, and finally para aminobenzoic acid meeting the medicinal-grade requirement can be obtained.

The utility model belongs to the technical field of tail gas recovery, and particularly relates to a tail gas condensation recovery tank for p-nitrobenzoic acid production, which comprises a tank body system, a first tank body and a second tank body which are connected in series, a tail gas inlet of the second tank body is connected with a condensation recovery liquid outlet of the first tank body through a pipeline, and the second tank body is used for treating unliquefied gas; the condensation unit comprises a first-stage condensation section and a second-stage condensation section, and the tail gas guider is installed below the tail gas inlet and attached to the condensation unit; the temperature control unit comprises a first temperature control module and a second temperature control module; the pressure regulating unit comprises a first-stage pressure regulator and a second-stage pressure regulator, and the first-stage pressure regulator is mounted in front of the tail gas inlet of the first tank body; the first-stage condensation section is used for recovering high-boiling-point components (such as p-nitrobenzoic acid and water), the second-stage condensation section is used for recovering low-boiling-point components (such as organic solvents), the recovery rate of target substances in tail gas is increased, and resource waste is reduced.

This invention discloses a halogen-free organic solderable protective agent and its preparation method, comprising the following components at the following mass concentrations: 2-phenylimidazolium 2.5-5 g / L, 2-benzylbenzimidazole 0.5-1.0 g / L, pyromellitic anhydride 30-60 mg / L, diethylene glycol 1-2 ml / L, ethanol 5-10 ml / L, p-nitrobenzoic acid 10-30 mg / L, and methotrexate 10-30 mg / L; the temperature is 35-45℃; the pH is controlled within the range of 3.8-4.2; and the balance is deionized water. This invention can be widely applied to the surface treatment process of electronic products, achieving a thickness rate of over 0.35 μm in 1 minute. The resulting film is uniform, transparent, and glossy, with strong solderability. It exhibits good resistance to sulfuric acid concentrations below 0.1 mol / L and readily dissociates in 5% hydrochloric acid and 5 ml / L acetone solutions, simplifying rework.

The utility model relates to the field of chemical engineering, in particular to a device for recycling and dehydrating isooctyl p-nitrobenzoic acid isooctyl ester and isooctyl alcohol. The recovery and dehydration treatment device comprises a crude product tank, a desolventizing kettle, a dehydration kettle and a water storage tank which are sequentially connected, the desolventizing kettle is further connected with a finished product tank, the dehydration kettle is further connected with an isooctyl alcohol tank, a desolventizing water segregator is arranged between the desolventizing kettle and the dehydration kettle, and the water storage tank is connected with the desolventizing water segregator. A desolventizing condenser is arranged between the desolventizing water segregator and the desolventizing kettle, a dehydration water segregator is arranged between the dehydration kettle and the water storage tank, a dehydration condenser is arranged between the dehydration water segregator and the dehydration kettle, and a water pump is arranged between the water storage tank and the desolventizing kettle.

The invention discloses a liquid aluminum electrolytic capacitor, and relates to the technical field of electrolytic capacitors. The liquid aluminum electrolytic capacitor is prepared by the following steps of: sequentially overlapping and winding anode foil, first electrolytic paper, cathode foil and second electrolytic paper into a core package; and the core package is subjected to electrolyte impregnation treatment, and after the core package is put into a shell and packaged, the liquid aluminum electrolytic capacitor is obtained. The electrolyte at least comprises the following raw materials in parts by mass: 60-75 parts of N, N-dimethylformamide; 15 to 25 parts of ethylene glycol; 3-5 parts of boric acid; 1.5 to 3 parts of ammonium formate; 1-3 parts of silicon-boron modified polyethylene glycol adipate; 0.5 to 1.5 parts of triethylamine; 0.3 to 0.7 part of ammonium hypophosphite; and 0.2 to 0.5 part of p-nitrobenzoic acid. The electrolyte prepared by the invention endows the liquid aluminum electrolytic capacitor with wide temperature range adaptability, high voltage tolerance and long service life stability.

The invention belongs to the technical field of chemical synthesis, and particularly relates to a preparation method of tetracaine intermediate 4-n-butylaminobenzoic acid. The method comprises the following steps: putting p-nitrobenzoic acid and a solvent into a reaction kettle, and dropwise adding thionyl chloride; raising the temperature and reacting until the reaction is complete; distilling to remove thionyl chloride and acidic gas, dissolving the solid with ethanol, transferring into a hydrogenation kettle, replacing with nitrogen, adding a platinum-carbon or palladium-carbon catalyst for reaction, after the reaction is finished, dropwise adding n-butyraldehyde under the conditions of heat preservation and pressure maintenance, and continuing the reaction until the reaction is finished; and filtering, transferring into a hydrolysis kettle, concentrating ethanol to be dry, adding a sodium hydroxide solution for reflux hydrolysis, and adjusting the acid with concentrated hydrochloric acid to obtain the 4-n-butylaminobenzoic acid. According to the method, p-nitrobenzoic acid which is low in price and easy to obtain is used as a raw material, a continuous reaction method is adopted, technological operation is simplified, the sewage discharge amount is reduced, energy is saved, consumption is reduced, and the technology is green and environmentally friendly.

The invention relates to a process for preparing isooctyl p-aminobenzoate through solvent-free hydrogenation, and belongs to the field of chemical engineering. The invention relates to a process for preparing isooctyl p-aminobenzoate through solvent-free hydrogenation. The process comprises the following steps: (1) adding isooctyl p-nitrobenzoate into a reactor; (2) adding a catalyst into the reactor; the catalyst is obtained by mixing 5% of Pd / c catalyst and 1% of Pt / c catalyst and then washing the catalyst; (3) in the absence of a solvent, introducing hydrogen, carrying out hydrogenation reaction until hydrogen is not absorbed, continuously keeping the temperature and pressure to terminate the reaction, and sampling and analyzing; (4) filtering out the catalyst from the material through a heat preservation filter, pressing the material into water for crystallization, cooling until filtration, and using mother liquor as water for crystallization of the next batch; and (5) drying the wet product in vacuum to obtain the product.

The present invention relates to a process for preparing p-aminobenzoic acid-2-ethylhexyl ester comprising reacting p-nitrobenzoic acid-2-ethylhexyl ester with hydrogen in the presence of a catalyst, wherein the reaction is performed in water or in a mixture of water and 2-ethylhexanol. Further, the present invention relates to the p-aminobenzoic acid-2-ethyl hexylester obtained by the process and having high purity.

This invention relates to a lithium-ion battery and its preparation method. A lithium-ion battery includes a positive electrode, a separator, a negative electrode, and an electrolyte. The positive electrode comprises a highly moisture-sensitive positive electrode active material with a specific surface area of ​​5 m² / g to 80 m² / g, and the residual moisture content of the positive electrode after drying is 200 ppm to 400 ppm. The electrolyte comprises a lithium salt, a solvent, a film-forming agent, an auxiliary agent, and a hydrogen scavenging agent. The film-forming agent includes 1,3-propanesulfonate lactone and 0.3% to 1.0% ethylene sulfate. The auxiliary agent is tris(trimethylsilane)phosphate. The hydrogen scavenging agent is ammonium p-nitrobenzoate. This lithium-ion battery is compatible with positive electrode sheets with high residual moisture content and, through a specially formulated electrolyte system, effectively suppresses the side reactions caused by this moisture, thereby achieving excellent electrochemical performance and safety.

The utility model belongs to the technical field of raw material mixing, and particularly relates to a raw material mixing device for p-nitrobenzoic acid production, which comprises a reaction kettle used for providing a reaction place for raw material mixing and reaction; the stirring assembly is mounted in the reaction kettle; the heating equipment is used for providing heat energy for raw material reaction; the power assembly is connected with the heating equipment; the cooling equipment is used for cooling the reaction kettle when the temperature in the reaction kettle exceeds a preset threshold value; the temperature sensor is used for monitoring the reaction temperature in the reaction kettle in real time; when the temperature exceeds a preset threshold value, controlling the power assembly to drive the heating equipment to be separated from the reaction kettle, and starting the cooling equipment; when the temperature recovers to a safe range, the power assembly is controlled to drive the heating equipment to reset, and the cooling equipment is stopped, the duration of temperature out-of-control is greatly shortened through the double guarantee mechanism of cutting off the heat source and actively cooling, the method is particularly suitable for key reaction steps which are prone to heat release in p-nitrobenzoic acid synthesis, and side reactions can be effectively restrained.