171 results about "Oxalic acid" patented technology

The invention belongs to the technical field of pharmaceutical chemical processes, and particularly relates to a preparation method of a penem antibiotic intermediate 4-BMA, which comprises the following steps: adding Zn powder, chlorosilane, aliphatic tertiary amine, zinc salt and 4-AA in a formula (I) into THF (tetrahydrofuran), uniformly stirring, dropwise adding a THF solution of alpha-haloamide with an induction group in a formula (II) for reaction, filtering the reaction solution, removing the zinc powder, and drying to obtain the penem antibiotic intermediate 4-BMA. Extracting the filtrate to obtain a THF phase, washing with an aqueous solution of potassium oxalate, and recovering THF to obtain a formula (III); and carrying out oxidative hydrolysis, sulfur dioxide quenching, sulfur dioxide acid regulation crystallization and recrystallization on the formula (III) to obtain the intermediate 4-BMA. According to the preparation method disclosed by the invention, a zinc salt is used as a catalyst during preparation of the formula (III), potassium oxalate is used for removing residual Zn (II) in a THF phase, SO2 is used for quenching hydrogen peroxide and acid regulation and crystallization of 4-BMA, the oxygenolysis problem of 4-BMA is solved, and the preparation method has the characteristics of greenness, safety and high efficiency, is strong in product competitive advantage and is suitable for industrial production.

The invention discloses a preparation method of CoWO (cobalt tungsten oxide) modified NbOp-n heterojunction NbO5 / CoWO photocatalyst powder. The preparation method comprises the following steps: dissolving cobalt salt and tungsten salt in deionized water, stirring and mixing, carrying out hydrothermal reaction in an autoclave, washing and drying to obtain CoWO powder; the preparation method comprises the following steps: dissolving niobium oxalate and ammonium carbonate in deionized water, adding CoWO powder, carrying out a hydrothermal reaction in an autoclave, and carrying out washing and drying treatment to prepare NbO / CoWO photocatalyst powder. According to the method, the hydrothermal reaction temperature is regulated and controlled, and the mass ratio of raw materials is optimized, so that the catalyst forms a p-n heterojunction structure of NbOmicron flower loaded CoWOnano particles. The prepared catalyst has high norfloxacin wastewater degradation efficiency under visible light irradiation, has the advantages of simple preparation process, low reagent cost, high catalytic activity and good structural stability, and can be effectively applied to purification treatment of antibiotic polluted water.

The invention belongs to the technical field of medical analysis, and particularly relates to a method for separating chemical components in hemsley rockvine root. According to the present invention, various chromatography methods are adopted to carry out separation and purification, such that sitroside (I), vanillyl glycolII (II), 5-hydroxymaltol (III), vanillic acid (IV), afzelin (V), 2, 3-dihydroxypyrazole (9E, 11E)-13-hydroxypyrazole (9, 11-dienoate), and 2, 3-dihydroxypyrazole (10E, 12E)-9-hydroxypyrazole (10, 12-dienoate) are obtained from hemsley rockvine root. Wherein the compounds II, III, VI and VII are separated from the hemsley rockvine root for the first time, and development and quality control of the hemsley rockvine root medicinal material are facilitated.

The invention discloses a reactor for treating iron and aluminum metal resources through ammonium oxalate, which is used for extracting iron and aluminum substances after the ammonium oxalate reacts with the iron and aluminum metal resources, and comprises a reaction kettle body, a stirrer, a first pipe orifice for filling high-pressure water vapor, and a second pipe orifice for relieving pressure and filling materials, the third pipe orifice is used for discharging an oxalic acid complex; the fourth pipe orifice is used for discharging ammonia steam; the first pipe orifice, the second pipe orifice and the third pipe orifice are respectively provided with a switch valve; and the fourth pipe orifice is provided with a constant pressure valve. The reaction kettle is used for reacting ammonium oxalate with iron and aluminum metal resources, and device conditions are provided for extracting the iron and aluminum metal resources through ammonium oxalate.

The application discloses a triazine ring synthesis method, and belongs to the technical field of medical intermediate synthesis. The method is characterized in that 2-methylaminothiourea and dimethyl oxalate are used as raw materials, a nanometer catalyst of scandium triflate (Sc(OTf)3) or ytterbium triflate (Yb(OTf)3) is loaded on magnetic Fe3O4@SiO2, a cyclization reaction is carried out in an organic solvent, the catalyst is separated and recovered through an external magnetic field after the reaction is completed, and high-purity triazine rings are obtained through acidification, crystallization and drying of the reaction liquid. The catalyst has the advantages of high specific surface area, high catalytic activity, easy magnetic separation and recovery, and can be reused more than 6 times. The product yield can reach 93% to 96%, and the purity is greater than or equal to 99.6%. The method realizes green, efficient and low-cost synthesis of triazine rings.

The invention belongs to the technical field of coal ethylene glycol, and particularly relates to a process and a device for finely removing impurities from carbon monoxide after cryogenic separation of synthesis gas, the device comprises an impurity removal device, the impurity removal device comprises a desulfurization tank, a dechlorination tank and a decarbonylation tank which are sequentially connected in series, or an adsorption tower which is sequentially filled with desulfurization, dechlorination and decarbonylation adsorbents; the impurity removal device is arranged to remove trace hydrogen sulfide, hydrogen chloride, carbonyl iron and carbonyl nickel in CO after cryogenic separation, so that ppb-level removal of impurities in CO is realized, poisoning of a downstream dimethyl oxalate (DMO) synthesis catalyst is avoided, the service life of the catalyst is prolonged, the production cost of an enterprise is reduced, and the operation stability of the device is improved.

The invention discloses a method for preparing 6N and above high-purity Nb2O5 by using a niobium oxalate precursor, belongs to the technical field of niobium pentoxide preparation, and solves the problems of low purity and high impurity content of Nb2O5 prepared by the existing method. The method comprises the following steps: mixing niobium oxalate with high-purity water to obtain a mixed solution; performing cold crystallization purification; separating niobium oxalate crystals from the mother liquor, washing and drying; the method comprises the following steps: putting niobium oxalate crystals into a crucible, putting the crucible into a vacuum reaction distillation furnace, sealing a system, vacuumizing to below 1Pa, carrying out inert gas replacement, and then carrying out stage heating and heat preservation; cooling to 800-900 DEG C, introducing high-purity oxygen into the system, and carrying out oxidation stabilization treatment at a constant temperature; after treatment, continuously cooling to 200 DEG C or below, and then naturally cooling to room temperature to obtain a high-purity Nb2O5 product. The Nb2O5 product prepared by the method disclosed by the invention is high in purity and low in impurity content.

The present invention is a platinum (II) oxalate compound of the formula: wherein R1, R2 and R3 are as defined herein. The platinum (II) oxalate compound of the present invention can be used as a catalyst in a hydrosilylation reaction, especially in the hydrosilylation of curable siloxanes.

This invention provides an antistatic agent that complies with PFAS regulations, exhibiting excellent resin compatibility and exhibiting sufficient antistatic performance with only a small amount of additive. [Solution] An antistatic agent comprising one or more onium salts selected from formulas (1) and (2). TIFF2026058576000010.tif23169 TIFF2026058576000011.tif25168 (In the formula, R1 to R4 are alkyl groups that may be the same or different, X represents an alkyl chain or a heteroatom-containing alkyl chain, and Y is a bisfluorosulfonyliimide or bisoxalatoborate anion.)

The invention belongs to the technical field of adsorption materials, and particularly relates to a coupling adsorption material containing zeolite and biomass charcoal as well as a preparation method and application of the coupling adsorption material. The coupling adsorption material is composed of modified zeolite, modified coconut shell biomass charcoal and a silane coupling agent interface bonding layer. After the modified zeolite is modified by three steps of hydrochloric acid, ammonium oxalate and sodium chloride, skeleton exchange sites are unified to be Na < + > type, and the NH < 4 + > interception capability is enhanced; after the modified coconut shell biomass charcoal is oxidized by nitric acid and modified by zirconium oxychloride and phosphoric acid, ammonia nitrogen is removed through multi-mechanism synergy; after two-phase coupling, the ammonia nitrogen removal capability is superior to that of a single component. The silane coupling agent interface bonding layer effectively buffers interface thermal stress generated by mismatching of two-phase thermal expansion coefficients in the high-temperature regeneration process, inhibits microcrack initiation and expansion, guarantees the adsorption capacity stability after multiple regeneration cycles, and prolongs the service life of the material.

The application discloses a method for preparing N-ethoxyl oxalyl alanine ester by using a dynamic tubular reactor, which comprises the following steps: (1) reacting L-alanine, diethyl oxalate and 4-dimethylaminopyridine in the dynamic tubular reactor; (2) removing light components from the reaction solution; (3) reacting the reaction solution after removing the light components and ethanol in the dynamic tubular reactor; and (4) obtaining N-ethoxyl oxalyl alanine ester after removing the light components. Compared with traditional kettle reactors and tubular reactors, the method adopts the dynamic tubular reactor to prepare N-ethoxyl oxalyl alanine ester, and through the regulation of reaction parameters, the selectivity of key by-products N-oxamide and double N-oxamide can be effectively controlled below 2%. The process has the advantages of high reaction yield, high degree of continuous operation, significantly shortened reaction time and no use of high-toxicity materials such as benzene.

The application discloses a recycling method of lithium iron phosphate black powder, which comprises the following steps: mixing sintered lithium iron phosphate black powder with a first acidic reagent and an oxidizing agent, and filtering to obtain a first solution and a first solid; performing impurity removal on the first solution to obtain lithium dihydrogen phosphate; mixing the sintered first solid with a first phosphoric acid solution to obtain a second solution; and performing impurity removal on the second solution to obtain ferrous oxalate.

The invention provides a preparation method and application of ferrous oxalate, and belongs to the field of comprehensive utilization of solid waste resources, the preparation method of the ferrous oxalate comprises the steps that iron ore waste residues are subjected to acid leaching treatment, and a first iron-containing solution is obtained; performing resin impurity removal on the first iron-containing solution to obtain a second iron-containing solution; and mixing the second iron-containing solution with a compound containing oxalate, and carrying out precipitation reaction to obtain ferrous oxalate. Then, the ferrous oxalate can be used as an iron source to be mixed with a lithium source, a phosphorus source, a carbon source and a solvent to obtain a mixture; and grinding and drying the mixture, and sequentially carrying out primary sintering and secondary sintering to obtain the lithium iron phosphate material. According to the technical scheme provided by the invention, the iron element can be extracted from the iron ore waste residues, the high-purity ferrous oxalate is prepared, and then the lithium iron phosphate material is prepared by taking the ferrous oxalate as an iron source, so that the preparation cost of the lithium iron phosphate material is effectively reduced, and efficient utilization of the iron ore waste residues is realized.

The application discloses an interface control liquid for prelithiation electrodes, a preparation method and application, and the interface control liquid comprises a solvent and a metal salt; the solvent comprises one or more of an ether solvent, an ester solvent, a ketone solvent, a hydrocarbon solvent, a nitrile solvent or deionized water; the metal salt comprises one or more of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium hexafluoroarsenate, lithium bisoxalate borate, lithium bisfluorosulfonimide, lithium bistrifluoromethylsulfonimide, lithium perchlorate, lithium fluoride and lithium chloride; the concentration of the metal salt is 0.001 g / mL-10 g / mL; the prelithiation electrode is obtained by supplementing lithium to an electrode by a chemical prelithiation solution; the interface control liquid is used for modifying the prelithiation electrode, the metal salt of the interface control liquid reacts with the chemical prelithiation solution remaining on the surface of the prelithiation electrode, and a solid electrolyte layer containing inorganic lithium salt is generated on the surface of the prelithiation electrode; wherein, the content of the inorganic lithium salt is between 5% and 90%.

This invention relates to the field of fertilizers, specifically to an organic fertilizer containing *Penicillium oxalate* and *Trichoderma echinococcosis*, and its preparation method. The organic fertilizer, by weight percentage, comprises: 10%-25% *Penicillium oxalate*, 10%-25% *Trichoderma echinococcosis*, 10%-20% sheep manure, 5%-10% ammonium phosphate, 5%-10% potassium fertilizer, 10%-20% straw ash, 1%-5% glyphosate, 1%-5% 6-benzylaminopurine, with a binder to make up 100%. The active ingredients of this invention are *Penicillium oxalate* and *Trichoderma echinococcosis*. It is mainly used to increase the yield of vegetables, flowers, and other crops while preventing fungal diseases such as anthracnose and black rot.

The application discloses a lactobacillus johnsonii OD-5 and application and products thereof, and belongs to the technical field of microorganisms. A technical problem to be solved by the application is to provide a lactobacillus johnsonii capable of treating kidney stones. A technical solution is a lactobacillus johnsonii OD-5 with a preservation number of CGMCC No. 38426. The lactobacillus johnsonii can reduce urine oxalic acid and regulate urine calcium, effectively correct abnormal urine biochemical conditions promoting stone formation, reduce related kidney function damage, and inhibit formation and deposition of calcium oxalate crystals in the kidney at a histopathological level, thereby significantly reducing the stone incidence. The application provides a solid theoretical basis for development of products taking the lactobacillus johnsonii OD-5 as a core component and used for preventing kidney stones and improving stone kidney damage.

The application belongs to the technical field of photocatalytic nanomaterials, and relates to a preparation method of Nb2O5@Ag3PO4 composite material, which comprises the following steps: a. dissolving niobium oxalate in a mixed solution of deionized water and hydrogen peroxide, and magnetically stirring to obtain solution A; b. adding ammonia water into solution A, magnetically stirring, and hydrothermally reacting, and then treating the product after the reaction to obtain white powder B; c. dissolving powder B in anhydrous ethanol, and ultrasonically and stirring to mix to form a uniform mixed solution C; d. respectively dissolving silver nitrate and sodium phosphate in deionized water to form solutions D and E for standby; e. dropping solution D into solution C at a certain rate to obtain solution F; f. dropping solution E into solution F at a certain rate, and then centrifuging, cleaning and drying at a constant temperature for a certain time to obtain the Nb2O5@Ag3PO4 composite material. The application has the advantages of simple process, low cost, short reaction period, no pollution to the environment, and visible light photocatalytic performance.

The present invention relates to antiperspirant and deodorant compositions for correction of body odour, and more particularly relates to antiperspirant and deodorant compositions for human hygiene. The disclosed anti-perspirant and deodorant composition comprises isobutane, propane, butane, cyclopentasiloxane, caprylic / capric triglyceride, stearalkonium hectorite, propylene carbonate, c12-15 alkyl benzoate, parfum, silver lactate, lactic acid, aqua, zea mays starch, menthyl ethylamido oxalate, argania spinosa kernel oil. Furthermore, the active antimicrobial silver ingredient is dermatologically tested and is capable of diminishing odor-causing bacteria in addition to prevention of irritation and itching.

The invention discloses a method for recovering zinc from high-zinc-content waste liquid by using organic acid. The method comprises the following steps: 1) adding the high-zinc-content waste liquid into a reaction kettle; 2) slowly adding oxalic acid for reaction to generate zinc oxalate precipitate; and 3) after the reaction is completed, obtaining zinc oxalate slag through a leaching filter press, and washing the zinc oxalate slag with water to obtain zinc oxalate. According to the method, zinc sulfate produced in the white smoke process and oxalic acid are used as raw materials, high-purity zinc oxalate is prepared through chemical reaction, efficient synthesis of zinc oxalate is achieved by accurately controlling reaction conditions, and the method is high in product purity and suitable for industrial production. The method not only solves the problem of open circuit of waste liquid of a white smoke system, but also is an efficient and environment-friendly zinc oxalate preparation method.

The invention discloses a C, N-FeNbO4 / NF microrod based on foamed nickel in-situ 001 crystal face derivation and a derivation method and application thereof, and the method comprises the following steps: in a hydrothermal reaction, hydrolyzing urea to release OH-to replace oxalate in niobium oxalate so as to form a Nb-OH monomer; meanwhile, Fe < 3 + > is hydrolyzed into Fe (OH) 3 colloid; the preparation method comprises the following steps: performing liquid phase nucleation on Nb-OH and Fe (OH) 3 under a hydrothermal condition to form a FeNbO4 precursor, and growing the FeNbO4 precursor on foamed nickel (NF) in situ; in this way, the 001 crystal face of FeNbO4 is accurately regulated and controlled through the strong coordination effect of F <-> to form a rod structure. Under high-temperature (900 DEG C) carbonization, the FeNbO4 is further crystallized into an acid-resistant and alkali-resistant monoclinic crystal type three-dimensional microrod (C, N-FeNbO4 / NF) with C and N co-doped (C, N-FeNbO4) composite NF. According to the method disclosed by the invention, the agglomeration phenomenon of FeNbO4 is relieved; the microrod structure exposes more catalytic active sites, so that the catalytic activity is improved. In addition, the catalyst shows high conductivity by co-doping C and N with synergistic high-conductivity NF. Based on the regulation and control, the C, N-FeNbO4 / NF shows good electrochemical performance in the oxygen evolution reaction.

The present application relates to the technical field of asiatic acid, and particularly relates to an asiatic acid derivative and a preparation method.The asiatic acid derivative provided by the present application has R which is a straight chain or a branched chain with 1-24 carbon atoms, or a saturated or unsaturated monohydric alcohol alkyl formed by removing a hydroxyl group.The R group of the asiatic acid derivative of the present application has higher water solubility and oil solubility, especially oil solubility, so that the asiatic acid derivative has obviously enhanced liposolubility compared with asiatic acid, is easily dissolved in natural oil, alkane and other ester solvents, and has obviously enhanced biological activity, so that the asiatic acid derivative of the present application has high availability, improves the inhibition effect of the asiatic acid derivative on EDNRA and TRPV1, and further improves the anti-tumor effect, and the asiatic acid derivative has no safety risk.

The present application relates to the technical field of microbial inoculant, in particular to a compound microbial inoculant containing penicillium oxalicum and a preparation method thereof, the compound microbial inoculant containing penicillium oxalicum comprises the following raw materials in parts by weight: penicillium oxalicum solid-state fermentation product 3-5 parts, zeolite powder 20-25 parts, potassium fulvate 5-10 parts, humic acid 10-15 parts, sodium lignosulfonate 8-12 parts, and modified diatomite 30-40 parts. The compound microbial inoculant containing penicillium oxalicum prepared by the present application has excellent soil-borne disease control effect and good stability.

A polymer comprising pyridinium salt moieties, wherein the polymer has the following structure: In this structure, R1 and R6 are each N. At least a portion of R2 and R7 groups in the polymer are each negatively charged counterions selected from the group consisting of carboxylates, nitrates, nitrites, azides, metasilicates, tetraborate, perborates, boronates, oxalatob orates, metaborates, phosphorus-containing anions, halides, sulfates, SO4 -2, HSO4 -1, thiosulfate, dithionite, metabisulfite, persulfate, methanesulfonate, dioctyl sulfosuccinate, 3-sulfopropyl ethoxylate laurylphenyl ether, and combinations thereof. R3, R4, R8, R9, R11, R13, R14, R15, and R16 are each selected from the group consisting of H and groups including one or more carbon atoms. R5 and R10 are any group including one or more carbon atoms. The n is an integer from 2 to about 100,000.

The invention belongs to the technical field of medicinal chemistry, and particularly relates to a dasatinib vanillic acid crystal form and a preparation method thereof, and in the dasatinib vanillic acid crystal form provided by the invention, the molar ratio of dasatinib to vanillic acid to water is 1: 1: 1. The dasatinib vanillic acid crystal form provided by the invention has relatively good stability and relatively high dissolution rate, and is of great significance for improving the bioavailability of a dasatinib medicine and preparing a preparation.

The invention belongs to the technical field of food fresh-keeping materials, and particularly relates to an aerogel type composite fresh-keeping pad as well as a preparation method and application thereof. The preparation method of the aerogel type composite fresh-keeping pad comprises the following steps: S1, mixing polyethylene glycol, oxalic acid and polyacrylic acid, and stirring at 70-80 DEG C to obtain a eutectic solvent; the method comprises the following steps: mixing a biomass raw material with a deep eutectic solvent, extracting, and filtering to obtain solid residues; s2, mixing the obtained solid residues with water, performing high-pressure homogenization treatment, mixing the obtained cellulose-containing suspension with a gelatin solution and a cross-linking agent, pouring the obtained mixed solution into a forming mold, performing freeze-drying treatment, and taking out to obtain the aerogel type composite fresh-keeping pad. The aerogel type composite fresh-keeping pad prepared by the method disclosed by the invention has good mechanical property, water absorption and antibacterial activity, and shows an excellent fresh-keeping effect in fresh-keeping of fish slices.

This invention discloses a method for cultivating pearl grouper, belonging to the field of aquaculture technology. Through careful design of active component configuration and juvenile feeding according to size, component A includes the following raw materials: β-chitosan, oxalic acid, and *Gnaphalium affine* extract; component B includes the following raw materials: sugarcane extract, rye seed powder, and oryzanol; component C includes the following raw materials: fig polysaccharide, yeast β-glucan, and eucalyptus oil. When the juvenile size is 2.2~5.0cm, a basic feed supplemented with components A and B is provided; when the juvenile size is 5.1~10cm, a basic feed supplemented with components A and C is provided; when the juvenile size is greater than 10cm, a basic feed supplemented with components A, B, and C is provided. The cultivation method of this application can improve the resistance of pearl grouper to *Vibrio harveyi* infection and / or its low-temperature tolerance, and the cultivation method is simple and the raw materials are readily available.

The invention provides a preparation method of a zinc-based metal organic framework material, which is carried out in a water phase at normal temperature and normal pressure, does not need to use organic solvents such as methanol, DMF (Dimethyl Formamide) and the like, is simple and convenient to operate, environment-friendly and low in cost, and is a green preparation method. The preparation method provided by the invention comprises the following steps: S1, adding alkali metal oxalate into a zinc salt aqueous solution, and stirring to obtain a white turbid liquid; the ratio of the amount of substance of oxalate in the alkali metal oxalate to the amount of substance of zinc ions in the zinc salt is (1-4): 1; s2, mixing a benzotriazole aqueous solution with the pH value of more than 8.5 with the white turbid liquid obtained in the step S1, and stirring to react; the molar ratio of the benzotriazole to zinc ions in the zinc salt is (3-10): 1; the pH value of the benzotriazole aqueous solution is adjusted to be greater than 8.5 by adding organic amine; and S3, separating the reaction feed liquid obtained in the step S2, and washing and drying a solid product obtained by separation to obtain the zinc-based metal organic framework material.

The present disclosure provides processes for preparing alpha-hydroxy esters by adding a vinyl Grignard reagent to an oxalate and thiolizing the resulting double bond. Also provided are alpha-hydroxy esters and synthetic intermediates prepared according to the processes disclosed herein, as well as compositions comprising the alpha-hydroxy esters.

The invention discloses a method for increasing the load of a dimethyl oxalate synthesis system and reducing the content of methyl nitrite in the system, and the method comprises the step of arranging a tubular reactor connected with a reactor A / B in parallel on a pipeline between a preheater and a gas removal tower. After the rotating speed of a compressor is adjusted, the circulating flow of outlet gas is controlled to be 420000-440000 Nm < 3 > / h, and meanwhile effective gas components entering the tubular reactor and the reactor A / B in the system are controlled to comprise 16%-22% of CO, 3%-6% of NO and 12%-14% of MN; s2, after feeding of the reactor A / B and the tubular reactor is completed, a flow adjusting valve at an inlet of the tubular reactor is immediately adjusted, the ratio of the flow of the inlet of the reactor A / B to the flow of the inlet of the tubular reactor is controlled to be 4.5-5.5: 1, and meanwhile the content of methyl nitrite in the system is controlled to be 14.5%-15.8%. The bottleneck problem of high safety production risk caused by low dimethyl oxalate synthesis yield and high methyl nitrite content in the original system is solved.