53 results about "Hydantoin" patented technology

A method for controlling a chemical process, by preparing methanol, hydrogen sulfide, methyl mercaptan, hydrocyanic acid, acrolein, 3-methylthiopropionaldehyde, 5-(2-methylmercaptoethyl)-hydantoin, methionine, a salt of methionine, and a derivative of methionine. The method includes providing a training set TS1, wherein TS1 is process values PV1 and process values PV2 being correlated to one another, and / or laboratory values LV1 and process values PV2 being correlated to one another. The method includes training a processing unit on the training set TS1 to identify a pattern of correlation between one or more measured process variables and at least one process variable. The method includes developing a calibration function CF1 for a calibrated soft sensor from the identified pattern of correlation and predicting at least one operating parameter for the chemical process as an approximation to LV1 and / or PV1. A system for controlling a chemical process.

The subject matter described herein is directed to myelin-promoting compounds of Formula I and pharmaceutical salts thereof, methods of preparing the compounds, pharmaceutical compositions comprising the compounds, and methods of administering the compounds for the treatment of disorders, such as myelin-related disorders.

The invention relates to the technical field of cyanide-free silver plating solutions and preparation, and discloses a cyanide-free silver plating solution based on composite coordination and double-pulse fine regulation and a preparation method thereof.The cyanide-free silver plating solution comprises silver salt, a composite coordination agent, supporting electrolyte, a pH regulator and a composite functional additive, the silver salt provides silver ions with the concentration being 15-50 g / L, and the composite coordination agent provides silver ions with the concentration being 15-50 g / L; the composite coordination agent is composed of 80-140 g / L of a hydantoin main coordination agent and 15-30 g / L of a nitrogen heterocyclic amide auxiliary coordination agent, the concentration of the supporting electrolyte is 75-130 g / L, the supporting electrolyte is used for enhancing the conductivity of the plating solution, and the pH regulator is used for maintaining the pH value of the plating solution within the alkaline range of 9.0-11.5; the composite functional additive comprises 0.5-4 g / L of a main brightener, 0.1-1.5 g / L of an auxiliary brightener and 5-25 g / L of a grain refiner, and is used for improving the glossiness and compactness of a plating layer; through the preparation method, the difficulty and cost of wastewater treatment during solution plating can be reduced, the environmental protection effect is improved, and the stability of the plating solution during long-term use is improved.

This invention discloses a method for preparing sodium ketovaline, belonging to the field of chemical synthesis technology, including the following steps: using hydantoin and acetone as raw materials, and using a solid base catalyst K / MgAlO x Using sodium hydroxide as the main catalyst and a solvent as the co-catalyst, a condensation reaction is carried out in the presence of a solvent. After the condensation reaction is completed, a certain amount of sodium hydroxide is added, and the hydrolysis reaction is continued under the catalysis of a solid base catalyst to prepare sodium ketovaline. This invention can effectively improve the yield of sodium ketovaline, and the catalyst can be recycled.

The invention discloses a whitening facial cleanser and a preparation method thereof, and relates to the field of skin care products. The whitening facial cleanser is prepared from 35 to 42 weight percent of a cleaning agent, 1 to 2 weight percent of a whitening and freckle-removing agent, 0.8 to 1.2 weight percent of a skin conditioner, 4 to 8 weight percent of an emollient, 4 to 6 weight percent of a humectant, 0.3 to 0.5 weight percent of a preservative, 0.05 to 0.1 weight percent of a chelating agent, 4 to 4.5 weight percent of a thickening agent, 0.2 to 0.5 weight percent of an aromatic, 0.8 to 1.0 weight percent of a pH regulator and the balance of a solvent. The cleaning agent is prepared from sodium lauroyl isethionate, sodium cocoyl aminopropionate, cocamidopropyl betaine and sodium lauroyl sarcosinate according to the weight ratio of (3.5 to 4.5) to 1 to 1 to 1; the preservative comprises DMDM hydantoin and methylparaben in a weight ratio of (3-4): 1. The whitening facial cleanser provided by the invention has both cleaning power and mildness, and also has a whitening effect.

Embodiments of the present application provide an electroplating solution for a gold-silver alloy and a use thereof. The electroplating solution comprises a gold ion source, a silver ion source, a first complexing agent, and a second complexing agent, wherein the first complexing agent comprises a hydantoin-based substance, and the second complexing agent comprises an organic sulfonic acid or a salt thereof. By means of a synergistic effect of the two types of complexing agents, the electroplating solution exhibits relatively high stability and can specifically inhibit electrodeposition of silver without affecting deposition of gold, thereby reducing the influence of current density fluctuations on the gold content in an alloy coating. Thus, an alloy coating having a gold content stably maintained within a range of 30-50 wt% can be produced over a relatively wide current density range having an interval width of at least 0.3 ASD.

Compounds that contain an ethylenically unsaturated group, an active-hydrogen group, and an aspartate group and / or hydantoin group are described. Also disclosed are methods for producing and using such compounds, such as their use in coating compositions, such as coating compositions suitable for application to optical glass fiber substrates.

The invention relates to a guanidino hydantoin methanesulfonate nonlinear optical crystal as well as a preparation method and application thereof. The molecular formula of the crystal is C3N3OH < 6 > (CH3SO3), the molecular weight is 195.2, the crystal belongs to an orthorhombic system, the space group is P212121, and the cell parameters are as follows: a = 5.5142 (5), b = 8.6892 (7), c = 17.4413 (16), alpha = 90.00 degrees, beta = 90.00 degrees, gamma = 90.00 degrees, Z = 4 and V = 820.5 (3) 3. Under the irradiation of 1064nm laser, the powder frequency-doubled effect of the crystal is about 3-5 times that of KH2PO4 (KDP), the ultraviolet absorption edge of the crystal is about 217nm, and the experimental birefringence is about 0.08-546nm. And growing crystals with the size of more than centimeter by adopting an evaporation method, an aqueous solution cooling method or a solvothermal method. The crystal is simple in preparation method and low in cost, has a relatively large nonlinear optical effect, a relatively large birefringence and a wide transmission range, is easy to grow and process, and can be used as an ultraviolet nonlinear optical crystal and a birefringence crystal.

A polyoxymethylene polymer composition containing a formaldehyde stabilizer package is disclosed. In one embodiment, the formaldehyde stabilizer comprises a substituted hydantoin, it has been found that the substituted hydantoin alone or a combination of a substituted hydantoin with another emission control agent significantly reduces formaldehyde emissions. When the polymer composition does not contain calcium stearate, the formaldehyde emission is low.

The invention discloses a continuous preparation process of bromochlorohydantoin, and belongs to the technical field of bromochlorohydantoin production, 5, 5-dimethylhydantoin, water and liquid caustic soda are mixed and then enter a two-section microchannel reactor and a one-section tubular reactor respectively to react with bromine, chlorine and a phase transfer catalyst, and a finished product bromochlorohydantoin is prepared; by utilizing the method, high-purity bromochlorohydantoin can be obtained, the production yield is high, and due to the adoption of continuous production, the production process is easy to control, the energy consumption is reduced, the production efficiency is improved, and meanwhile, the safety and controllability of the production process are also realized.

The application discloses a kind of electroplating gold tin alloy plating solution stabilizer.The components of the stabilizer include: 3,4-dihydroxyphenethyl alcohol, 1-amino hydantoin, cysteine and D-2,3,5,6-tetrahydroxy-2-hexenoic acid-gamma-lactone.The plating solution stabilizer described in the application has the characteristics of simplicity, non-toxic, low dosage concentration and low cost, and is suitable for large-scale industrial production.In the electroplating solution added with the electroplating gold tin alloy plating solution stabilizer of the application, the stability of the alloy ratio in the plating layer can be greatly improved without changing the original surface state of the plating layer and the electroplating rate, so that the gold tin alloy plating layer with the best performance can be stably obtained in industrial production, the production efficiency and product quality are improved, the stability of the plating solution is greatly improved, the plating solution can be stored and used for a long time without precipitation, discoloration and other phenomena in a short time, the production cost is reduced, and the environment is protected.

A purpose of the present invention is to provide a method for producing a glycoside compound having a high purity. The present invention provides a method for producing a glycoside compound represented by formula (3) (wherein Ba, i-Pr and n are the same as those defined below), which comprises reacting a glycoside compound of formula (1) (wherein Ba represents an adenine group which may be optionally substituted with an acyl group, and i-Pr represents an isopropyl group) with an ether compound of formula (2) (wherein R1 represents a C1-C6 alkyl group or a phenyl group, and n is 0 or 1) in one or more solvents selected from tetrahydropyran and 4-methyltetrahydropyran in the presence of one or more halogenated agents selected from halogen, N-halogenated succinimide, and N-halogenated hydantoin.

The invention belongs to the technical field of sludge treatment, and provides a method and a system for strengthening sludge cracking and producing medium-chain fatty acid. The method comprises the following steps: concentrating sludge, mixing the concentrated sludge with halogenated hydantoin, and cracking to obtain cracked sludge; and carrying out two-stage fermentation treatment on the cracked sludge to obtain the medium-chain fatty acid. According to the method, halogenated hydantoin is adopted as a pretreatment agent for cracking the sludge, and through spontaneous combination of halogenated hydantoin molecules and the sludge extracellular polymeric substances, tight combination type extracellular polymeric substances and cell walls are remarkably oxidized and damaged; meanwhile, hypochlorous acid is slowly released to maintain a proper oxidative stress effect to stimulate the biological metabolism effect of anaerobic microorganisms, hydrolysis and acidification of organic matters are promoted, and a large number of electron acceptors are provided for microorganisms participating in carbon chain extension to produce MCFA subsequently. The method is simple, low in cost, small in medicament demand and beneficial to promoting efficient resource utilization of the sludge.

A metal oxide varistor (MOV) device including a MOV chip, electrically conductive first and second electrodes disposed on opposite sides of the MOV chip, electrically conductive first and second leads connected to the first and second electrodes, respectively, and an arc mitigating, flame retarding coating covering the MOV chip, the first and second electrodes, and portions of the first and second leads, the arc mitigating, flame retarding coating comprising a silicone composition formed of a filler material suspended in a silicone resin, wherein the filler material includes one or more of melamine, guanidine, guanine, hydantoin, allantoin, urea, melamine-formaldehyde, melamine-cyanurate polymer, and boric acid.

The application relates to the technical field of plastic waste recycling, in particular to automatic recycling equipment for hydantoin epoxy resin waste. The equipment comprises a shell, the shell is fixedly connected with first and second guide plates, the shell is fixedly connected with a baffle, the shell is provided with a first electromagnetic slide rail, a first electromagnetic slide block is slidably connected in the first electromagnetic slide rail of the shell, the first electromagnetic slide block is fixedly connected with an extrusion plate, the shell is provided with a second electromagnetic slide rail, a second electromagnetic slide block is slidably connected with the second electromagnetic slide rail of the shell, and the second electromagnetic slide block is fixedly connected with an extrusion frame. The extrusion plate and the extrusion frame drive one side of the waste to reciprocate, the waste is continuously bent, the epoxy resin on the waste is continuously broken and falls off, the efficiency of epoxy resin recycling is improved, the waste is not directly broken, the content of waste impurities in the recycled epoxy resin is reduced, and therefore the quality of the recycled epoxy resin is improved.

The application discloses a kind of integrated circuit chip package lead frame's electroless gold plating solution and its gold plating method, it is related to integrated circuit chip packaging field.Therein, electroless gold plating solution is following concentration component aqueous solution: water-soluble gold compound, with Au, concentration is 1-1.5g / L;Sodium hypophosphite 10~20g / L;Malic acid 15~20g / L;Citric acid 15~20g / L;N,N'-bis (2-hydroxyethyl) ethylenediamine 10~15g / L;Triammonium citrate 15~20g / L;EDTA-2Na 5~10g / L;5,5'-dimethyl hydantoin 5~10g / L;Metal ion catalyst, with metal ion, concentration is 2~3ppm;Mercaptoimidazole 0.01~0.015g / L;Hexamethylenetetramine 5~10g / L.The electroless gold plating solution in the application can consider stability, high deposition rate and plating layer deposition uniformity.

The invention discloses a preparation method of ketovaline sodium, which belongs to the technical field of chemical synthesis, and comprises the following steps: by taking hydantoin and acetone as raw materials, a solid base catalyst K / MgAlOx as a main catalyst and sodium hydroxide as a cocatalyst, carrying out condensation reaction in the presence of a solvent, after the condensation reaction is completed, adding a certain amount of sodium hydroxide, and carrying out a reaction for 2-4 hours to obtain ketovaline sodium. Continuously carrying out hydrolysis reaction under the catalysis of the solid base catalyst to prepare ketovaline sodium; according to the method, the yield of the ketovaline sodium can be effectively improved, and meanwhile, the catalyst can be recycled.

Engineered hydantoinase variants and uses of the engineered hydantoinase variants in biocatalytic production of L-glufosinate are provided. L-glufosinate is produced by hydrolyzing a 5-substituted hydantoin with a hydantoinase engineered to exhibit enhanced L-enantioselectivity to form a carbamoyl-containing compound and then cleaving the carbamoyl group with an L-stereospecific carbamoylase. The L-glufosinate thus produced may be utilized as an herbicide for agriculture.

The invention discloses a synthetic method of halogenated polystyrene hydantoin. The synthetic method is a one-step synthetic method. The preparation method comprises the following steps: firstly, preparing a raw material for synthesizing halogenated polystyrene hydantoin, and synthesizing 1-halogen-5, 5-dimethyl hydantoin from 5, 5-dimethyl hydantoin and halogen under an alkaline condition; halogenated polystyrene hydantoin, namely 1-halogen-3-(4-polystyrene-benzyl)-5, 5-dimethyl hydantoin, is synthesized from chloromethyl polystyrene and monohalogenated dimethyl hydantoin in one step, so that the synthesis efficiency is high, the cost is low, and large-scale production is facilitated. Meanwhile, halogenated polystyrene hydantoin is synthesized in the solvent, so that swelling of polystyrene is facilitated, the yield is increased, the reaction time is short, the synthesis efficiency is high, and the cost is greatly reduced. The mother liquor is recycled, and the mother liquor contains a large amount of materials during preparation, so that waste liquid discharge is avoided, and the wastewater treatment cost is reduced; and waste is turned into wealth, so that the cost is reduced, the waste can be recycled for multiple times, the wastewater output is reduced, and the wastewater treatment cost and the production cost are further reduced.

The invention relates to the technical field of layered composite fabrics, and discloses a composite fabric based on a functional coating and a preparation method of the composite fabric. Epoxidized hydantoin and chitosan are grafted with epoxidized nano-silver to prepare hydantoin chitosan modified nano-silver with good antibacterial performance, then vanillin is used for blocking polyurethane containing disulfide bonds to obtain vanillin modified polyurethane, the hydantoin chitosan modified nano-silver and the vanillin modified polyurethane are cross-linked, and the nano-silver modified vanillin polyurethane is prepared. The composite fabric prepared by compounding the formed functional coating and the base cloth has excellent antibacterial performance.

The invention relates to a hydantoin-containing deoxyuridine triphosphatase inhibitor and a preparation method thereof. Provided herein are dUTPase inhibitors, compositions comprising these compounds, and methods of using these compounds or compositions.

The invention provides a preparation method of 2, 4, 6, 8-tetrahydroxypyrimido [5, 4-d] pyrimidine, and belongs to the technical field of medicinal chemistry. The method provided by the invention comprises the following steps: mixing hydantoin and oxalyl urea, and carrying out Knoevenagel reaction to obtain a double five-membered ring intermediate; mixing the double five-membered ring intermediate with an alkaline solution, then carrying out a rearrangement reaction, then mixing a solution obtained by the rearrangement reaction with a hydrochloric acid solution, and then carrying out solid-liquid separation to obtain a crude product; and sequentially pulping and drying the crude product to obtain the 2, 4, 6, 8-tetrahydroxypyrimido [5, 4-d] pyrimidine. The method provided by the invention has the advantages of easily available raw materials, simple operation, safe process and less three wastes, and is suitable for industrial production.

A polyoxymethylene polymer composition is disclosed, comprising a formaldehyde stabilizer package. This formaldehyde stabilizer package, containing at least two emission control agents, significantly and unexpectedly reduces formaldehyde emissions. The formaldehyde stabilizer package includes at least two emission control agents selected from benzoguanamine compounds, hydantoin, substituted hydantoin, amino acids, and alkylene ureas such as ethylene urea.

The invention belongs to the technical field of medicinal chemistry, and particularly relates to a thiohydantoin derivative as well as an extraction method and application thereof. The thiohydantoin derivative is a compound shown in the following structural general formula, a crystal, an optical isomer or a pharmaceutically acceptable salt, wherein R1 and R2 are respectively and independently selected from hydrogen, hydroxyl, substituted phenyl, C1-C6 alkyl and C1-C6 alkoxy; substituent groups on the substituted phenyl groups are selected from C1-C6 alkylene groups and C1-C6 alkyl groups; r1 and R2 are different. By optimizing a separation process, the natural thiohydantoin derivative with a novel structure is obtained for the first time, and the structure is found for the first time. The invention also determines that the compound has good diabetic nephropathy resisting activity for the first time.

Hydantoin based compounds useful as inhibitors of matrix metalloproteinases (MMPs), particularly macrophage elastase (MMP-12) are described. Also described are related compositions and methods of using the compounds to inhibit MMP-12 and treat diseases mediated by MMP-12, such as asthma, chronic obstructive pulmonary disease (COPD), emphysema, acute lung injury, idiopathic pulmonary fibrosis (IPF), sarcoidosis, systemic sclerosis, liver fibrosis, nonalcoholic steatohepatitis (NASH), arthritis, cancer, heart disease, inflammatory bowel disease (IBD), acute kidney injury (AKI), chronic kidney disease (CKD), Alport syndrome, and nephritis.

The invention discloses a co-production method of dibromohydantoin and bromochlorohydantoin, and belongs to the technical field of disinfectant production, mother liquor generated in the production process of dibromohydantoin is used as a raw material to be directly used for preparing bromochlorohydantoin, and collaborative production and resource recycling of two high-value disinfectants are achieved. Comprising the following steps: firstly, synthesizing dibromohydantoin by using 5, 5-dimethyl hydantoin as a raw material, and recovering mother liquor; mixing the treated active bromine mother liquor with 5, 5-dimethyl hydantoin, carrying out chlorination reaction to generate bromochlorohydantoin, and purifying and drying to obtain a finished product. By recycling the mother liquor, the consumption of bromine and chlorine is remarkably reduced, and efficient recovery and in-situ utilization of bromine resources in the mother liquor are realized; meanwhile, the problems of safety and environmental protection caused by organic solvent extraction are avoided, the process is green, the yield is high, large-scale production is easy, and the method is suitable for large-scale preparation of disinfectants.

This invention relates to a masking film and its preparation method, belonging to the field of polymer film materials. By weight, the masking film comprises the following components: 60-70 parts of modified polyamide resin, 15-30 parts of polyethylene resin, 10-15 parts of epoxy resin, and 2-5 parts of additives. The modified polyamide resin is obtained by modifying polyamide resin with supercritical carbon dioxide. The epoxy resin is composed of hydantoin epoxy resin and hyperbranched epoxy resin in a weight ratio of (3-7):(1-2). Based on existing technology, this invention mainly uses a supercritical carbon dioxide process to modify the polyamide resin, while introducing an epoxy resin formed by compounding hydantoin epoxy resin and hyperbranched epoxy resin in appropriate proportions. This significantly improves the mechanical properties and dimensional stability of the masking film, endowing it with excellent properties such as high tensile strength and low shrinkage, thereby meeting the usage requirements in different scenarios such as automotive painting.

The invention discloses a novel Burkholderia cepacia resistant to preservatives and application of the novel Burkholderia cepacia resistant to the preservatives. The new burkholderia cepacia Bcc621 is preserved in the Guangdong Microbial Culture Collection Center (GDMCC), the address is the 5th floor, No. 59 building, No. 100 courtyard, Xianlie Middle Road, Guangzhou, the postal code is 510070, the preservation date is December 17, 2025, and the preservation number is GDMCC No: 67496. The bacterium is resistant to kathon, phenoxyethanol, sodium benzoate, potassium sorbate and 1, 3-dihydroxymethyl-5, 5-dimethyl hydantoin, and the bacterium is resistant to drugs of kathon, phenoxyethanol, sodium benzoate, potassium sorbate and 1, 3-dihydroxymethyl-5, 5-dimethyl hydantoin. According to the present invention, the KirbyBauer (KB) drug sensitive experiment results show that the new Burkholderia cepacia is resistant to the preservative;

This application relates to the technical field of reverse osmosis membranes, and discloses a highly chlorine-resistant hydrophilic membrane and its preparation process. The hydrophilic membrane includes a membrane body and a first chlorine-resistant layer and a second chlorine-resistant layer sequentially disposed on the surface of the membrane body. The first chlorine-resistant layer uses raw material components including laccase, dopamine, 5,5-dimethylhydantoin, and a stabilizer. The concentration of the laccase is 0.1-0.3 wt%, the concentration of the dopamine is 0.8-1.2 wt%, the concentration of the 5,5-dimethylhydantoin is 0.3-0.6 wt%, and the concentration of the stabilizer is 0.2-0.4 wt%. The second chlorine-resistant layer is obtained by crosslinking a first carboxymethyl dextran and a second carboxymethyl dextran. The molecular weight of the first carboxymethyl dextran is smaller than that of the second carboxymethyl dextran, and the weight ratio of the first carboxymethyl dextran to the second carboxymethyl dextran is (1-5):1. This application can improve the durability of chlorine resistance and maintain good water flux.

The invention relates to a shielding film and a preparation method thereof, and relates to the field of polymer film materials, the shielding film comprises the following components by weight: 60-70 parts of modified polyamide resin, 15-30 parts of polyethylene resin, 10-15 parts of epoxy resin, and 2-5 parts of an auxiliary agent; the modified polyamide resin is obtained by carrying out supercritical carbon dioxide modification treatment on polyamide resin; the epoxy resin is composed of hydantoin epoxy resin and hyperbranched epoxy resin in a weight ratio of (3-7): (1-2). On the basis of the prior art, polyamide resin is modified mainly by adopting a supercritical carbon dioxide process, and meanwhile, epoxy resin formed by compounding hydantoin epoxy resin and hyperbranched epoxy resin in a proper proportion is introduced, so that the mechanical property and the dimensional stability of the shielding film are remarkably improved; the excellent properties such as high tensile strength and low shrinkage rate are endowed, so that the use requirements in different scenes such as automobile paint spraying are met.