19 results about "Pyridine hydrochloride" patented technology

The invention belongs to the technical field of zinc battery electrolyte, and discloses application of pyridine hydrochloride as an electrolyte additive in stabilizing a zinc negative electrode and realizing four-electron transfer of a zinc-iodine secondary battery. The hydrochloride containing the pyridine structure is used as an electrolyte additive, molecules of the pyridine structure are adsorbed on the surface of the zinc negative electrode to form a shielding layer, the deposition / stripping reversibility of the zinc negative electrode is improved, stabilization of the zinc negative electrode can be achieved, and the problems of zinc dendritic crystal, corrosion and hydrogen evolution are solved. Meanwhile, molecules with pyridine structures can activate and stabilize I- / I0 / I < + > four-electron redox reaction, inhibit I < + > hydrolysis side reaction and improve the energy density and cycling stability of the zinc-iodine battery. The problem of poor electrochemical deposition / stripping reversibility of a zinc negative electrode and the problem of poor stability of positive valence I < + > species of an iodine positive electrode of a four-electron transfer reaction are solved. The electrolyte containing the additive is low in cost, simple in method, easy to produce and high in practical value.

The invention relates to the technical field of metal powder material preparation, and particularly discloses antimony-doped cesium terbium chloride microcrystalline powder and a preparation method thereof. The chemical composition of the microcrystalline powder is Cs < 5 > Tb < 1-x > Sb < x > Cl < 8 >. 6H < 2 > O, wherein x is equal to 0.05 to 0.30. The preparation method comprises the following steps: mixing cesium chloride, terbium chloride hexahydrate and antimony trichloride according to a molar ratio of 5: 0.8: x; adding pyridine hydrochloride as a chlorine element supplement, wherein the dosage of the pyridine hydrochloride is that 0.05-0.20 mmol of Py.HCl is used for every 1 mmol of CsCl; adding stearic acid as a process dispersant; and through combined treatment of mechanical ball milling and freeze drying, antimony-doped cesium-terbium-chlorine microcrystal powder with regular morphology and good dispersibility is obtained. The method is simple in process and mild in condition, particle aggregation can be effectively inhibited, the crystallinity and dispersion uniformity of the powder are improved, and the prepared microcrystal powder shows excellent optical performance.

The application provides a preparation method of a rare earth selective adsorption material, and the method comprises the following steps: mixing activated carbon and a silane coupling agent in a medium, and adjusting the pH for the first time to obtain an intermediate product; mixing the obtained intermediate product with 2-chloromethyl pyridine hydrochloride, and adjusting the pH for the second time to obtain the rare earth selective adsorption material. The preparation method of the rare earth selective adsorption material is simple, the raw materials are mature chemical products, and the method is easy to realize large-scale production. The prepared rare earth selective adsorption material can selectively adsorb rare earth elements, the pH of the adsorption environment is consistent with the actual low-concentration rare earth element wastewater, the concentration of the adsorbed rare earth elements is as low as 10 mg / L, the adsorption effect is excellent in a high-salt environment with a concentration of 5 g / L, the adsorption and desorption can be recycled, and the method is economical and practical.

The invention provides a method for measuring the residual quantity of prochloraz in vegetables and fruits, which comprises the following specific steps: S1, pulping the vegetables and fruits, preserving the pulp at low temperature, adding acetonitrile and a mixed salt bag, and immediately oscillating and centrifuging to obtain supernate; s2, adding PSA and magnesium sulfate into the supernate, carrying out vortex mixing uniformly, and centrifuging to obtain supernate; and S3, putting the supernate into a high-pressure digestion tank, concentrating to be dry at 40-45 DEG C, adding pyridine hydrochloride into the high-pressure digestion tank, sealing, transferring to a drying oven for heating, cooling and washing, adding n-hexane into a washing solution for vortex, standing for layering, and carrying out liquid nitrogen blowing on the supernate to form a to-be-detected solution, and determining the to-be-detected solution by using a gas chromatography tandem mass spectrometer. The QUCHERS method is combined with the high-pressure digestion tank and the gas chromatography tandem mass spectrometer to form an integral scheme which cannot be absent, so that the method is suitable for quickly, efficiently and accurately detecting the residual quantity of prochloraz in vegetables and fruits, and has a good application prospect.

The invention relates to an amino acid monomer based on 3, 5-dinitropyridine-2-sulfenyl protection and a synthetic method of polypeptide of the amino acid monomer. The monomer has the following structural formula, according to the preparation method, a corresponding polypeptide is synthesized from a 3, 5-dinitropyridine-2-sulfenyl protected amino acid monomer through a solid-phase synthesis method under a mild weakly acidic deprotection condition (2M 2-mercaptopyridine and an N, N-dimethylformamide solution of 1M pyridine hydrochloride), so that the generation of by-products caused by adopting an alkali (piperidine) deprotection condition in a current polypeptide solid-phase synthesis technology is avoided. The solid-phase synthesis method of the polypeptide based on the 3, 5-dinitropyridine-2-sulfenyl, disclosed by the invention, has a wide application prospect in the field of polypeptide synthesis.

The application discloses an MXene aerogel diaphragm and a preparation process thereof, and belongs to the technical field of lithium battery diaphragms. The MXene aerogel diaphragm disclosed by the application contains the following components in parts by weight: 100 parts of modified carboxymethyl cellulose, 5-15 parts of MXene nanosheets, 20-30 parts of a crosslinking agent, 0.1-100 parts of a pH regulator, and 10000-20000 parts of a solvent. The modified carboxymethyl cellulose is prepared by first subjecting sodium carboxymethyl cellulose to a nucleophilic ring-opening reaction with glycidyl methacrylate to obtain GMA-CMC, and then subjecting the GMA-CMC to a Michael addition with 2-amino-4-(trifluoromethyl) pyridine hydrochloride. The MXene aerogel diaphragm disclosed by the application has excellent structural stability, high ionic conductivity and good thermal stability.

The invention relates to the technical field of polyurethane, and discloses a water-based polyurethane fireproof coating and a preparation method thereof, pentaerythritol diphosphate diphosphoryl chloride, 4-methoxy-L-phenylalanine, pyridine hydrochloride and the like are used as reactants to prepare a novel carboxyl-containing water-based flame-retardant chain extender, and the water-based flame-retardant chain extender is used as a fire retardant. And carrying out polymerization reaction with dihydric alcohol and diisocyanate monomer to obtain the waterborne polyurethane fireproof coating. The polyurethane water-based emulsion is good in dispersity, high in emulsion stability and excellent in hardness; meanwhile, a nitrogen-phosphorus flame-retardant structure of the bis-spirophosphamide is grafted into a polyurethane molecular chain, so that the combustion limit oxygen index of the polyurethane film material is remarkably improved and reaches 27.9-29.6%, and the UL-94 grade reaches V-0.

The invention relates to the technical field of synthesis of pharmaceutical compounds, and particularly discloses a preparation method of 1-(4-fluoro-3-pyridyl) ethanone. According to the preparation method provided by the invention, 4-aminopyridine is taken as a starting material and reacts with fluoboric acid and sodium nitrite, fluorine is firstly applied to a pyridine ring to obtain 4-fluoropyridine hydrochloride, and then the 4-fluoropyridine hydrochloride reacts with lithium diisopropylamide and N-methoxy-N-methylacetamide to obtain 1-(4-fluoro-3-pyridyl) ethanone. According to the preparation method provided by the invention, the raw materials are cheap and easy to obtain, the operation in the preparation process is simple, and the yield is high.

This invention discloses a bispyridyl extractant, its preparation method, and its application as a nickel-cobalt extractant. The bispyridyl extractant has the following structure: wherein R is C 12 ~C 25 The alkyl group is prepared by reacting chloromethylpyridine hydrochloride with a primary amine compound via a bimolecular nucleophilic substitution reaction. This bispyridine extractant has stable physicochemical properties, large saturation capacity, good oil solubility of the extract, and good coordination complexing ability for nickel (cobalt) ions. It can be used in combination with DNNSA or P204 to form a synergistic extraction system for selective extraction and separation of nickel and cobalt in complex metal ion solution systems. It can also be used as a single extraction system for efficient extraction and separation of nickel and cobalt in hydrochloric acid systems, showing good prospects for industrial application.

The application discloses a kind of chitosan double pyridyl group acid-resistant adsorbents and its preparation method and application, belong to electroplating sludge processing technical field.The application selects chitosan as matrix, and carries out amine group and pyridyl group grafting on its basis, and the adsorbent containing amine group and pyridyl group is prepared, the problem that the hydroxyl group and amine group on chitosan body are protonated in acidic solution and the ability of chelating metal cation is poor is solved, and heavy metal in acidic solution cannot be effectively separated.The substitution reaction of amine group and the reagent 2-chloromethyl pyridine hydrochloride (2-CPD) with lower price is used in the application, compared with existing M4195 commercial resin, production cost is reduced, and it is suitable for wide range of popularization and application.

This invention relates to the field of polyurethane technology and discloses a waterborne polyurethane fire-retardant coating and its preparation method. A novel carboxyl-containing waterborne flame-retardant chain extender is prepared using pentaerythritol diphosphate bisphosphonate chloride, 4-methoxy-L-phenylalanine, and pyridine hydrochloride as reactants. This chain extender is then polymerized with diol and diisocyanate monomers to obtain the waterborne polyurethane fire-retardant coating. The waterborne polyurethane emulsion exhibits good dispersibility, high emulsion stability, and excellent hardness. Furthermore, the nitrogen-phosphorus flame-retardant structure of bisspirocyclic phosphoramide is grafted into the polyurethane molecular chain, significantly improving the limiting oxygen index of the polyurethane film material to 27.9-29.6%, achieving a UL-94 rating of V-0.

The invention belongs to the field of organic flow battery material synthesis, and particularly discloses a high-solubility HATN material and application thereof in a flow battery. The preparation method comprises the following steps: adding 4-methoxy o-phenylenediamine and cyclohexanehexone hydrate into an organic solvent, refluxing under the protection of nitrogen, cooling, washing with water, washing with methanol, and drying in vacuum; carrying out reflux reaction on the prepared product and pyridine hydrochloride under the protection of nitrogen, cooling, washing with water, and carrying out vacuum drying to obtain an intermediate product; and finally, adding the intermediate product, ethyl 2-bromopropionate and potassium carbonate into an organic solvent to react, precipitating the product by using HCl, washing with water, and drying in vacuum to obtain a final product. The derivative disclosed by the invention has a large pi-pi conjugate plane structure, the redox reaction relates to six-electron transfer, and meanwhile, the solubility of the compound is expanded by grafting a water-soluble functional group, so that the problem of battery stability caused by the solubility is solved. And the flow battery assembled by the composite material has excellent capacity and good stability.

The invention provides a preparation method of a tofacitinib citrate intermediate, and belongs to the technical field of pharmaceutical chemicals. According to the preparation method, 3-halogenated-4-methylpyridine is taken as a raw material, and the (3R, 4R)-1-benzyl-3-methylamino-4-methyl-piperidine dihydrochloride is prepared through nucleophilic substitution, benzyl halide protection, hydroboron reduction, chiral resolution, dissociation and salification. According to the invention, the boron hydride is used as a reducing agent, and a pyridine ring of the 1-benzyl-3-methylamino-4-methylpyridine hydrochloride is reduced into a piperidine ring, so that the production cost is reduced. The synthesis method is mild in reaction condition, simple to operate and suitable for large-scale industrial production.

The utility model relates to the technical field of filling devices, in particular to an efficient filling device for chloromethyl pyridine hydrochloride, which comprises a tank body, the tank body is fixed on a base through a mounting frame, a belt conveyor is mounted at the top of the base, a discharge pipe is arranged at the bottom of the tank body, the belt conveyor is positioned below the discharge pipe, a top cover is mounted at the top of the tank body, and a plurality of nozzles are arranged on the top cover. The bottom of the top cover is rotationally connected with a rotating shaft, the top of the rotating shaft is connected with a driving motor, the driving motor is fixed to the top of the top cover, the other end of the rotating shaft is rotationally connected to the end of a discharging pipe, a discharging opening is formed in one side of the bottom of the discharging pipe, and a first spiral blade is installed on the side face of the rotating shaft. The raw materials in the discharging pipe can be cooled through the refrigeration piece, crystallization of the raw materials due to too high temperature during conveying and filling is avoided, the situation that the crystallized raw materials adhere to the second spiral blade to block the discharging pipe is avoided, and the using effect is improved.

The present invention relates to the technical field of chemical waste treatment and resource recovery, and in particular to a method for recovering anhydrous acetonitrile and anhydrous pyridine from pyridine hydrochloride acetonitrile waste liquid. The method comprises the following steps: step 1: performing detailed component analysis on the pyridine hydrochloride acetonitrile waste liquid by gas chromatography, determining the contents of pyridine hydrochloride and acetonitrile in the filtrate, calculating the amount of NaOH used, adding 2-5 wt% of solid NaOH and 1-5 wt% of polyethylene glycol to the filtrate under the condition of 10-20 degrees Celsius, and simultaneously treating the mixture with an ultrasonic device for 15-60 minutes to fully react with the filtrate to obtain a mixed solution; step 2: filtering the mixed solution obtained in step 1 through a sand core funnel organic filter membrane to remove sodium chloride and excess sodium hydroxide. The separation operation of the scheme is simple and convenient to operate. In the traditional treatment method, pyridine and water are azeotroped, and water is introduced in the alkali neutralization stage, resulting in separation difficulties. The method does not introduce water, shortens the separation process, is easy to operate, and is suitable for large-scale production and application.

The invention relates to a preparation method of an oxadiazine insecticide, and belongs to the technical field of pesticides. The method comprises the following steps: by taking a compound in a formula IV as a raw material, carrying out grinding reaction on the compound and paraformaldehyde by using a ball mill to obtain a compound in a formula II; and then heating and reacting with a compound shown as a formula III in methylbenzene to obtain a compound shown as a formula I. According to the preparation method of the oxadiazine insecticide, pyridine hydrochloride is not used for catalytic reaction during preparation of the compound shown in the formula II, paraformaldehyde is adopted as a reaction raw material, a single product can be obtained through ball milling reaction under the solvent-free condition, and the situation that hydrolysis reaction occurs in the reaction process, and the reaction yield is affected is avoided. Meanwhile, the dosage of paraformaldehyde is reduced, and pyridine hydrochloride is omitted, so that the yield of waste gas and waste liquid is greatly reduced, and the method is suitable for industrial production.

The invention belongs to the technical field of organic synthesis, and particularly relates to a synthesis method of 1, 3, 5, 7-tetraacetyl-1, 3, 5, 7-tetraazacyclooctane. Comprising the following steps: with hexamethylenetetramine, first acetic anhydride and ammonium acetate as raw materials, carrying out an acylation reaction by using a microchannel reactor to obtain DAPT; dAPT and second acetic anhydride are used as raw materials, a ring-opening reaction is carried out in a reaction system composed of a pyridine hydrochloride catalyst and acetate, water is added after the reaction is finished, a hydrolysis reaction is carried out, and TAT is obtained. The invention provides a method for preparing DAPT through a micro-channel reactor under mild conditions, realizing ring opening of DAPT on the basis of a traditional acetic anhydride acylation method by using a cheap and easily available pyridine hydrochloride catalyst, obtaining the product TAT with higher yield and excellent selectivity, and reducing energy consumption, and the reaction process is simple.

The application relates to the technical field of metal powder material preparation, and particularly discloses a kind of antimony-doped cesium terbium chloride microcrystalline powder and a preparation method thereof.The chemical composition of the microcrystalline powder is Cs5Tb 1‑ x Sb x Cl8.6H2O, wherein x=0.05-0.30.The preparation method comprises the following steps: mixing cesium chloride, terbium chloride hexahydrate and antimony trichloride according to a molar ratio of 5:0.8:x; adding pyridine hydrochloride as a chlorine element supplement, wherein the amount of pyridine hydrochloride is 0.05-0.20 mmol per 1 mmol of CsCl; adding stearic acid as a process dispersant; and performing mechanical ball milling and freeze-drying combined treatment to obtain antimony-doped cesium terbium chloride microcrystalline powder with regular morphology and good dispersity.The application has simple process and mild conditions, can effectively inhibit particle agglomeration, improve the crystallinity and dispersion uniformity of the powder, and the prepared microcrystalline powder exhibits excellent optical performance.

The invention discloses a preparation method of berberine hydrochloride, and relates to the technical field of berberine hydrochloride production, a mixed solvent of glacial acetic acid, gamma-valerolactone and dimethyl sulfoxide and a mixed catalyst of cupric chloride dihydrate, ferrous chloride and 1-butyl-3-methylimidazolium tetrafluoroborate are adopted, and the berberine hydrochloride is prepared. The preparation method comprises the following steps: adding a glyoxal aqueous solution and a formaldehyde aqueous solution into a reaction kettle, mixing the glyoxal aqueous solution and the formaldehyde aqueous solution, dropwise adding the mixture into the reaction kettle, reacting, adding a glacial acetic acid solution of N-2, 3-dimethoxy benzyl pyridine hydrochloride, reacting, cooling, adjusting the pH value by using a calcium hydroxide suspension and a hydrochloric acid solution, and finally carrying out suction filtration, washing and drying to obtain berberine hydrochloride, so that the yield and the purity of the product are high.