133 results about "Oxalomalic acid" patented technology

The invention provides a copper-based catalyst used in preparation of glycol by catalytic hydrogenation of oxalate ester and a preparation method thereof. The catalyst comprises 10 to 50 wt% of copper and 50 to 90 wt% of silica, and has a specific surface area of 200 to 1200 m<2>/g, a pore volume of 0.5 to 1.4 cm<3>/g, an average aperture of 1.5 to 15 nm and a particle size below 100 nm; copper oxide nanoparticles are cladded by a mesoporous silicon shell, and a core-shell structure is formed. The catalyst provided in the invention has the advantages of a small particle size, uniform particlesize distribution, good dispersibility, and high activity, high selectivity and a long life when used in preparation of glycol by catalytic hydrogenation of oxalate ester. The preparation method has the advantages of simple operation and high yield.

The invention relates to isoalantolactone derivatives and salts thereof and provides an isoalantolactone derivative as shown in a formula (I). Salification acids are selected from inorganic acids or organic acids; the inorganic acids are selected from hydrofluoric acid, hydrochloric acid, hydrobromic acid, hydroiodic acid, sulfuric acid, nitric acid, phosphoric acid, carbonic acid, boric acid, seleninic acid, phosphomolybdic acid, phosphorous acid and sulphurous acid; the organic acids are selected from citric acid, maleic acid, D-malic acid, L-malic acid, DL-malic acid, L-lactic acid, D-lactic acid, DL-acid, oxalic acid, methylsulfonic acid, pentanoic acid, oleic acid, lauric acid, p-toluene sulfonic acid, 1-naphthalenesulfonic acid, 2-naphthalenesulfonic acid, phthalic acid, tartaric acid, malonic acid, succinic acid, fumaric acid, glycolic acid, mercaptan acid, glycine, sarcosine, sulfonic acid, nicotinic acid, methylpyridine acid, isonicotinic acid, benzoic acid or substituted benzoic acid.

The invention relates to a method for regeneration, absorption and removal of NO, alkyl nitrite, CO and N2O in tail gas from an oxalate synthesis process adopting CO carbonyl coupling. The method is characterized in that before emptying, tail gas from the oxalate synthesis process adopting CO carbonyl coupling is subjected to the following process steps: a) regeneration and absorption in an alkyl nitrite regeneration and absorption tower; b) high-temperature combustion in a high-temperature combustion furnace; c) catalytic reduction in a catalytic reduction reactor; d) combustion in a combustion device. The invention also relates to a system comprising the alkyl nitrite regeneration and absorption tower, the high-temperature combustion furnace, the catalytic reduction reactor and the combustion device. The method is simple and reliable, can recover NO and alkyl nitrite in the tail gas from the oxalate synthesis process adopting CO carbonyl coupling and reduces the operation cost, thereby having quite good economic benefit. Besides, CO and N2O in the tail gas can be removed, atmospheric pollution is prevented, and accordingly, good social benefit is realized.

The invention discloses a preparation method of TTZ (thiotriazinone), which comprises the following steps: 1) adding 5-10 kg of acetic acid and 50-150 kg of ammonium acetate into 1,800-2,200 kg of ethyl alcohol to prepare a buffer system with the pH value of 6-7; 2) adding 480-500 kg of 2-methyl-3-thiosemicarbazide, boron tribromide and diethyl oxalate, heating to 80-82 DEG C, and performing circulation reflux reaction for 4-6 hours, wherein the molar ratio of 2-methyl-3-thiosemicarbazide to diethyl oxalate is 1:(1.15-1.25), and the dosage of boron tribromide is 4-6% of the weight of 2-methyl-3-thiosemicarbazide; 3) cooling for crystallization, and separating to obtain a TTZ crude product and a mother liquor; 4) adding 1,800-2,200 kg of water in the TTZ crude product, heating to 70-80 DEG C, then adding 1,250-1,400 kg of hydrochloric acid with the concentration of 30%, cooling for crystallization, separating and drying to obtain the TTZ finished product. The preparation method has the advantages that the common problems of high cost, low yield, large yield variability, instability of product quality, difficulty in solvent recovery, large amount of waste water and the like in the prior art can be solved.

The invention belongs to the field of pharmaceutical analysis and particularly relates to a HPLC (high-performance liquid chromatography) detection method for escitalopram oxalate related substances. The escitalopram oxalate related substances are determined with HPLC, a C18 column is taken as a chromatographic column, a phosphate buffer solution is taken as a mobile phase A, the mobile phase A and an acetonitrile solution are mixed in a certain ratio to form a mobile phase B, the mobile phase A and the acetonitrile solution are mixed in a certain ratio to form a mobile phase C, and the escitalopram oxalate related substances are detected with a gradient elution method. The method can separate impurities, is high in specificity and sensitivity and good in repeatability and durability, can well control known impurities and unknown impurities of escitalopram oxalate and guarantees safety of escitalopram oxalate.

The present invention comprises methods and compositions for the reduction of oxalate in humans, and methods for the purification and isolation of recombinant oxalate reducing enzyme proteins. The invention provides methods and compositions for the delivery of oxalate-reducing enzymes in particle compositions. The compositions of the present invention are suitable in methods of treatment or prevention of oxalate-related conditions.

The invention provides lithium difluoro-bis(oxalate)phosphate as well as a preparation method and application thereof. The preparation method comprises the following steps: (1) mixing oxalyl chloride and lithium hexafluorophosphate with a non-aqueous solvent, adding siloxane, and reacting to obtain a lithium difluoro-bis (oxalate)phosphate solution; and (2) adding a poor solvent into the lithium difluoro-bis(oxalate)phosphate solution for crystallization treatment to obtain the lithium difluoro-bis(oxalate)phosphate. According to the method, lithium hexafluorophosphate, oxalyl chloride, hexamethyldisiloxane and other raw materials are adopted for preparing the difluoro-bis (oxalate)phosphate, and the method is few in side reaction, few in impurities, high in product purity and suitable for industrial production.

The invention discloses an oxalate-degrading strain NJODE1 and application thereof. The oxalate-degrading strain NJODE1 has a classification name of Enterococcus faecium with the preservation number of CGMCC NO. 4581. The oxalate-degrading strain NJODE1 has good tolerance to acids and bile salts, has no antibiotic resistance to most non-antibiotics, is safe for mice and can be colonized in dogs. The NJODE1 can reduce gastrointestinal absorption of oxalate in foods, thereby reducing the content of oxalate in urine, and thus reducing the incidence of canine calcium oxalate calculus. Whether thefinished product of the strain is food or pharmaceutical products or yogurt and fermented milk, the strain has good resistance to acids and bile salts, contains safe enterococci, and has significant effects on lowering the urinary oxalate content and preventing and treating calcium oxalate calculus of pets, thus having broad application prospects.

The present invention relates to pharmaceutical dosage forms of an antidepressant. More particularly, the present invention relates to pharmaceutical dosage forms of Escitalopram oxalate. The present invention also relates to a process for the preparation of pharmaceutical dosage forms of Escitalopram oxalate.

The invention relates to a catalyst carrier and a catalyst for synthesizing dimethyl oxalate. The preparation method of the catalyst carrier comprises the following steps: 1) reacting NaOH with excessive Al(OH)3 in water, adding an acid to adjust the pH value to 7-9, and filtering to obtain a wet filter cake; 2) adding an auxiliary agent metal salt into the wet filter cake, uniformly mixing, drying, roasting, and crushing to obtain powder; 3) carrying out ball rolling treatment on part of the powder obtained in the step (2), spraying a NaAlO2 solution during the ball rolling treatment, and drying to obtain small seed balls; and 4) carrying out ball rolling treatment on the seed balls, spraying a NaAlO2 solution during the ball rolling treatment, adding the powder obtained in the step 2), drying, and roasting to obtain the catalyst carrier. According to the preparation method, the alpha-Al2O3 carrier is prepared while the auxiliary agent precursor is doped into the alpha-Al2O3 carrier,so that the dispersity of the auxiliary agent is improved, the bonding strength of the auxiliary agent and the carrier is improved, and the preparation of the catalyst with good catalytic activity andlong service life is facilitated.

The invention discloses a purification method of lithium bis(oxalato)borate and the lithium bis(oxalato)borate, wherein the purification method comprises the steps: dissolving a lithium bis(oxalato)borate crude product in an organic solvent, and filtering to remove insoluble substances after the lithium bis(oxalato)borate crude product is completely dissolved; putting the filtered filtrate into areaction bottle, calculating the moisture content in the filtrate according to the moisture content in the lithium bis(oxalato)borate crude product and the dilution ratio after dissolution; then adding acyl chloride or thionyl chloride compounds in a certain proportion; after addition of the acyl chloride or thionyl chloride compound is finished, heating the mixture to any temperature between 35 DEG C and 70 DEG C; carrying out a heating reaction for any time between 3 hours and 9 hours; evaporating the reaction solution under reduced pressure to remove the solvent to obtain a semi-finished product, and recrystallizing the semi-finished product by using a mixed solvent to finally obtain the electronic-grade lithium bis(oxalate)borate of which the purity is more than 99.9 percent, the watercontent is less than 50 ppm, the acid value is less than 10 ppm, and the contents of potassium ions, sodium ions, calcium ions, magnesium ions and the like are all less than 10 ppm. The method has the beneficial effect of reducing water residue and impurity content.

The invention discloses cotton fabric finishing liquor which is prepared from the following components in parts by weight: 0.6 part of calcium dodecyl benzene sulfonate, 1.3 parts of methoxypolyethylene glycol, 1.9 parts of lauric acid, 2.4 parts of polypropylene glycol, 0.7 part of potassium oxalate and 0.6 part of fatty acid methyl ester sulfonate. The cotton fabric finishing liquor disclosed by the invention is good in hydrophilicity and permeability and can be used for enhancing the tensile resistance and the antifouling property of the cotton fabric.

The invention provides an Alpha-ketobutyric acid preparation method which comprises the following steps: A), taking dimethyl oxalate or diethyl oxalate as raw materials to solve in anhydrous furanidine, cooling, adding ethylmagnesium bromide solution, stirring, removing solvent through distillation under reduced pressure after reaction termination, allowing residual mixture to be subjected to rectification under reduced pressure, and collecting intermediate product 2-oxo methyl butyrate or 2-oxo ethyl butyrate; B), solving the intermediate product in a hydrochloric acid, heating, reflowing, stirring, performing extraction by vinegar naphtha after the completion of the reaction, collecting organic phase, drying, filtering, and removing the solvent through allowing the filtrate to be subjected to distillation under reduced pressure, so as to obtain a coarse product Alpha-ketobutyric acid; and c), allowing the coarse product Alpha-ketobutyric acid to be subjected to rectification under the reduced pressure, and collecting the Alpha-ketobutyric acid. The method provided by the invention has the advantages of inexpensive and easy-to-get raw materials, lower toxicity, simple preparation process, easiness in control, no complex purification process, high product purity, high productivity, and greatly reduced manufacturing cost, and is suitable for large scale industrialized application.

The invention relates to an analysis and detection method of multivitamin injection impurities, belongs to the field of medicine analysis, and mainly relates to a detection method of oxalic acid, 3-aminopropanol, retinol, alpha-tocopherol, menadione and vitamin K1 cis-isomer impurities in a multivitamin injection.

The invention discloses a material for forming mineral substance in a dentinal tubule by use of delayed reaction and application thereof, and belongs to the technical field of dentistry repairing materials. The material is characterized by comprising a reagent A, wherein the reagent A is EDTA-2Na, calcium chloride and sodium fluoride aqueous solution, the pH value is regulated by the sodium hydroxide and the hydrochloric acid; a reagent B is the mixed solution of potassium oxalate aqueous solution and n-butyl alcohol; the reagent A and the reagent B are mixed, continuously and quickly stirred to obtain a reagent C; the reagent C is immediately painted on the dental face for exposing the dentinal tubule, so that the reagent C can smoothly enter the dentinal tubule or a deep layer; the delayed reaction is started, the insoluble calcium oxalate and like mineral substances are gradually generated in the tubule of the dentinal tubule so as to block the dentinal tubule.

The invention provides an acid removal method of lithium salt, and particularly relates to an acid removal method of lithium bis(oxalato)borate. The deacidification method comprises the following steps: S1, providing a lithium salt crude product, testing the content of free acid in the lithium salt crude product, and calculating the total amount of the free acid in the lithium salt crude product;S2, heating and dissolving the lithium salt crude product in an organic solvent A to obtain a lithium salt crude product solution; S3, adding carbon and alkali into the lithium salt crude product solution, stirring, cooling, filtering, and carrying out rotary evaporation on the filtrate to obtain a saturated solution; and S4, adding an organic solvent B into the saturated solution, stirring untila solid is separated out, and filtering to obtain the deacidified lithium salt. The deacidification method can effectively remove free acid in the lithium salt, greatly improves the purity and qualityof the lithium salt, and is simple and environment-friendly to operate.

The invention relates to application of yoghourt in the field of preventing urinary calculus. Lactobacillus in the yoghourt has the effect of resolving oxalic acid, can degrade food-borne oxalic acid in intestinal tract, and reduce absorptive amount of the intestinal tract to the oxalic acid, so the yoghourt has the efficacy of preventing urinary calculus of the oxalic acid; and the yoghourt has important application in the fields of medicines, foods and health products. Through animal experiments, the invention provides that urinary oxalate excretion can be effectively reduced by drinking commercial yoghourt, thereby exploring a practical approach in preventing relapse of oxalate calcium calculus. The yoghourt has a plurality of obvious characteristics in health-care function and medicine-food homologization, and has the advantages of low cost, convenient taking and high compliance degree compared with a patient taking drugs, and does not have any side effect, so the yoghourt has better potential of prevention use.

Crystalline particles of escitalopram oxalate with a particle size of at least 40 mum is disclosed. Method for the manufacture of said crystalline particles and pharmaceutical compositions comprising said crystalline particles are also disclosed.

The invention belongs to the technical field of medicine and in particular relates to a synthetic method of a 1-(3-(dimethylamino)propyl)-1-(4'-fluorophenyl)-3-oxo-1,3-dihydroisobenzofuran nitrile compound.

The invention provides a special scale inhibitor for a saline-alkali soil moistube and a preparation method for the special scale inhibitor. The special scale inhibitor consists of the following components in parts by weight: 25-28 parts of 2-hydroxy phosphono-acetic acid, 27-30 parts of oxalic acid, 11-13 parts of citric acid, 9-12 parts of oxaloacetic acid, 4-8 parts of sodium lignin sulfonate, 9-10 parts of polyepoxysuccinic acid, 4-6 parts of nipasol, 1.5-3.5 parts of sodium diacetate, 1-2 parts of allyl polyether , 1-3 parts of dimethyl sulfoxide and 60-70 parts of water. The scale inhibitor needs to be diluted in use by adding water which is 5 times the amount of the scale inhibitor. The scale inhibitor disclosed by the invention is high in scale inhibiting ratio of 98.1-99.1%, wherein a calcium carbonate scale inhibiting ratio is 98.2-98.9%, a magnesium carbonate scale inhibiting ratio is 98.5-99.5%, a calcium sulfate scale inhibiting ratio is 99.2-100%, and a barium carbonate scale inhibiting ratio is 99.4-100%.