177 results about "Hydroxylamine compound" patented technology

To provide a method for producing a silver nanowire, including heating a silver complex in an aqueous solvent at a temperature equal to or below the boiling point of the aqueous solvent in the presence of at least one of a hydroxyketone compound and a hydroxylamine compound, and a silver nanowire obtained by the method.

Methods for the treatment or prevention of a number of ocular diseases or disorders are disclosed. In particular, methods are disclosed for the amelioration of macular degeneration, diabetic retinopathy and other retinopathies, as well as uveitis, presbyopia, dry eye, glaucoma, blepharitis and rosacea of the eye. The methods comprise administration of a compositions comprising an ophthalmologically acceptable carrier or diluent and a hydoxylamine compound in a therapeutically sufficient amount to prevent, retard the development or reduce the symptoms of one or more of the ophthalmic conditions.

The invention relates to a guar gum real silk printing paste slurry and relative preparation, which uses guar gum as main material and mellow as solvent, and in alkali condition, uses hydrogen dioxide solution as oxidant, to realize oxidation and decompositon; at the same time, uses multi hydroxylamine compound and aldehyde ketone compound as cross liner to process coupling reaction with guar gum; at last, adds sodium-hydroxide and uses ethylene oxide to process etherification to attain final product. The invention mainly supports the printing of real silk, and the printing of other dyes except from active dye. The inventive product has the advantages of easy preparation, better flow-ability, better match property to other dye agent, while treated real silk will have clear figure, fresh color, better uniformity, and better penetrability, without viscosity and network jam.

Trace amount levels of heavy metals such as mercury in crude oil are reduced by contacting the crude oil with a sufficient amount of a reducing agent to convert at least a portion of the non-volatile mercury into a volatile form of mercury, which can be subsequently removed by any of stripping, scrubbing, adsorption, and combinations thereof. In one embodiment, at least 50% of the mercury is removed. In another embodiment, the removal rate is at least 99%. In one embodiment, the reducing agent is selected from sulfur compounds containing at least one sulfur atom having an oxidation state less than +6; ferrous compounds; stannous compounds; oxalates; cuprous compounds; organic acids which decompose to form CO2 and / or H2 upon heating; hydroxylamine compounds; hydrazine compounds; sodium borohydride; diisobutylaluminium hydride; thiourea; transition metal halides; and mixtures thereof.

The invention discloses a selective flotation collector for spodumene and an application thereof. The collector is formed by performing saponification reaction on industrial fatty acid, hydroxylamine compounds and inorganic base in a mass ratio of (65-85%): (5-15%): (10-20%). The collector is suitable for being used at an ore pulp temperature of 10-25 DEG C, the dosage of the collector ranges from 100 to 600 g / t according to the change of the mineral content of spodumene in ores (or the difference of the contents of LiO2 in ores), and the collector is suitable for selectively floating and recovering spodumene from pegmatite ore. The principle that the collector plays a role of selective flotation on spodumene lies in that the oxy-oximido groups of the hydroxylamine compounds in the collector play a role of selective chelation on the active sites of aluminium, lithium and the like which are exposed on the surface of spodumene, thus enhancing the selective collection of the fatty acid components for spodumene ores. Via the saponification reaction, the water-solubility of the collector and the dispersivity of the collector in ore pulps are enhanced, so that the acting effect of the collector is improved.

The invention discloses a synthetic method of 3-aminomethyl tetrahydrofuran. The synthetic method comprises the following steps: (1) carrying out cyclization reaction on 1,4-butylene glycol under the action of a fixed acid catalyst, so as to generate 2,5-dihydrofuran; (2) carrying out hydroformylation reaction on 2,5-dihydrofuran under the action of a homogeneous catalyst HRhCO[P(PhX)3]3, so as to obtain 3-formaldehyde tetrahydrofuran; (3) reacting by virtue of 3-formaldehyde tetrahydrofuran and hydroxylamine compounds, so as to obtain 3-formoxime tetrahydrofuran; and (4) carrying out hydrogenation on 3-formoxime tetrahydrofuran, so as to obtain 3-aminomethyl tetrahydrofuran. The synthetic method disclosed by the invention is environmentally friendly and has the beneficial effects that the process is simple, the steps are short, the total yield is very high, the cost is low, the yield of products in each step is higher than 90%, and the total yield of the finally prepared 3-aminomethyl tetrahydrofuran is higher than 80%.

The present invention relates chemical mechanical planarization (“CMP”) of copper surfaces and describes copper CMP slurries including an oxidizer, one or more hydroxylamine compounds and at least one abrasive. The hydroxylamine compositions can include hydroxylamine nitrate, hydroxylamine, hydroxylamine sulfate, hydroxyl ammonium salts and mixtures thereof. The oxidizers may further include citric acid as a complexing agent for copper. Sulfuric acid and / or nitric acid provide means for modifying the pH of the oxidizer so that the hydroxylamine chemistries are acidic. Some embodiments include corrosion inhibitors such as benzotriazole, 2,4-pentadione dioxime and / or 1,6-dioxaspiro[4,4] nonane 2,7-dione. Some embodiments also include a free radical inhibitor, advantageously hydrazine. Colloidal silica and milled alumina are used as typical abrasive components.

A process for the oxidation of a hydroxy compound comprising the steps of: a) providing a first mixture containing an organic protonated hydroxylamine compound, b) oxidizing the protonated hydroxylamine compound to the corresponding nitrosonium compound, c) reacting the nitrosonium compound obtained thereby with a second mixture containing a hydroxy compound, and d) oxidizing the hydroxy compound with the nitrosonium compound, thereby generating the hydroxylamine.

The invention relates to the use of amidoximes for prevention of or stabilization of hydroxylamine compounds against undesired decomposition.

Methods for the treatment or prevention of a number of ocular diseases or disorders are disclosed. In particular, methods are disclosed for the amelioration of macular degeneration, diabetic retinophaty and other retinopathies, as well as uveitis, presbyopia, dry eye, glaucoma, blepharitis and rosacea of the eye. The methods comprise administration of a compositions comprising an ophthalmologically acceptable carrier or diluent and a hydoxylamine compound in a therapeutically sufficient amount to prevent, retard the development or reduce the symptoms of one or more of the ophthalmic conditions.

The invention discloses a method for producing high-purity triethylene diamine, which comprises the following steps: using a triethylene diamine reaction liquid from which low boiling point substances (including ammonia gas, water, ethylene diamine, diethylenediamine and the like) are removed as a raw material for rectification, adding C2-C5 hydroxylamine compounds which contain branched chains (methyl or ethyl groups) or contain no branched chains and account for 40-120% of the weight of the triethylene diamine reaction liquid, and rectifying on a rectifying tower to obtain a high-purity triethylene diamine solution, wherein the obtained azeotropic solution can be directly used as a catalyst, the concentration of the solution can be changed as required by regulating vacuum pressure, and the solution can be subject to cooling crystallization to separate out triethylene diamine the purity of which is higher than 99.9%. The invention has the characteristics of simple operating process and high purity of the purified product.

The invention relates to a high-efficiency environmentally-friendly polymerization inhibitor of styrene, and a use method thereof. The compound polymerization inhibitor comprises nitroxide free radical compounds, hydroxylamine compounds, nitrophenol compounds and phosphite ester compounds. The compound polymerization inhibitor utilizes ingeniously synergistic effects of the above compounds, thus overcomes respectively defects of a retarder and an actual polymerization inhibitor and improves obviously polymerization inhibiting effects. Simultaneously, the compound polymerization inhibitor realizes that the use of high toxic substances is reduced; toxicity is reduced; the solubility in styrene or ethylbenzene is increased; and good economic benefits are obtained.

The invention belongs to the technical field of chemical plating auxiliary agent and fine chemical intermediate, and more particularly relates to a method for preparing N-hydroxide radical diimide. The preparation method uses a novel catalyst system which is acetic anhydride / trifluoroacetic acid / organic base, so as to lead the conditions of the reaction for substituting dicarboxylic anhydride and hydroxylamine compound salt to be more mild; the reaction yield coefficient and product purity are improved, thus greatly reducing the production cost and being applicable to mass production and application.

The invention discloses a preparation method for inductively producing spherical and sphere-like silver powder by using micro-nano sized bubbles as crystal seeds. The preparation method specifically includes the steps that a prepared dispersing agent solution is added into a reaction kettle in advance, a micro-nano bubble generator is started, and the controllable micro-nano bubbles (0.1-900 nm) are generated in the dispersing agent solution in the reaction kettle; then, a prepared oxidation solution (an aqueous solution containing silver ions or a silver-ammonia solution) and a prepared reduction solution (an aqueous solution containing one or more of hydroxylamine compounds or vitamin C or formaldehyde or hydrazine hydrate) are added at the same time, and a reduction reaction is performed under violent stirring; and the micro-nano bubbles pre-generated in the dispersing agent solution are used as the crystal seeds, and the micro-nano bubble crystal seeds can effectively control the particle size of reduced silver particles in the whole reduction reaction process. According to the method disclosed by the invention, the particle size of the particles in the production process of the silver powder can be controlled effectively, and meanwhile the crystal nucleus growing speed and dispersity are well controlled; the produced silver powder has quite good crystallinity and sphericity, high vibratory compaction performance and high dispersity; and particularly, loose structures in the particles of the silver powder are of great help to the activity of the silver powder.

The invention relates to an efficient scale inhibitor of a tail-gas compressor of a styrene device and an application method thereof, comprising hydroxylamine compounds, alcohol amine compounds and phenol compounds. The invention overcomes the disadvantages that the generation of polymer dirt in the tail-gas compressor can not be effectively inhibited by using an ethylbenzene physical spraying method, can thoroughly inhibit and suppress the radical polymerization of the styrene, alpha-methyl styrene, phenyl ethylene and the other activated alkenes in the styrene tail-gas compressor, and has the functions of metallic catalytic coke deposition suppression and detergency and dispersancy. The invention has the advantages of safety and environment protection, energy conservation and low energy consumption and simple use, has no influence on downstream processes, can effectively promote the operational cycle and working load of the styrene tail-gas compressor, reduce energy and material consumption of the styrene device, and can improve the economical and social effects of the whole styrene device.

The invention relates to a preparation method of organism-based polyalcohol based on epoxidized plant oil and a hydroxylamine compound. The preparation method is characterized by comprising the following steps: 1) mixing the epoxidized plant oil with the hydroxylamine compound for reaction, carrying out ring-opening reaction on amino of the epoxidized plant oil and an epoxy group, and simultaneously reacting with an ester bond so as to generate an amido bond, thereby further generating a polyalcohol compound; 2) successively processing reaction products with acid and alkali so as to mainly remove the unreacted hydroxylamine compound; and 3) further separating and purifying so as to obtain the organism-based polyalcohol. In the preparation method, the regenerative resource plant oil is used as a main raw material; and reaction lines are novel and simple; and the obtained product is suitable for polyurethane material preparation and the like, and belongs to the technical fields of chemical materials and production thereof.

The invention discloses a magnet-flotation combined beneficiation technology of spodumene. Spodumene ore is subjected to smashing and grinding. Ore pulp after grinding is sequentially subjected to lowintensity magnetic separation and high intensity magnetic separation to respectively obtain low intensity magnetic concentrated ore and high intensity magnetic concentrated ore. The discharged high intensity magnetic tailing ore is subjected to concentration and desliming, and is provided for flotation operation. Procedures of the flotation operation comprises one time of roughing, two times of scavenging and two times of concentrating. A collecting agent adopts compound of Fatty calcium, hydroxylamine compound and oleic acid, wherein the ratio is (6-7):(2.0-2.5):(1.0-1.5). The Li2O grade inthe final lithium concentrate is as high as 5.8-6.4%, and the recycling rate is 79.0-88%. The beneficiation technology is simple, stable and reliable, applicability is high, the laboratory index and the industrial application index are in agreement with each other, and the disadvantage of a big gap between the industrial application index and the laboratory index in the spodumene beneficiation technology is overcome. The collecting agent is excellent in selectivity, high in collecting performance, and is environmentally friendly.

The present invention relates to N-formyl hydroxylamine compounds, a preparation method and a use thereof. The present invention provides a compound represented by a formula (I), or a pharmaceutically-acceptable salt of the compound, or an enantiomer of the compound, or a raceme mixture of the compound, wherein R1 is H, linear or branched alkyl containing 1 to 5 carbon atoms, R2 and R3 independently represent H, linear alkyl containing 1 to 5 carbon atoms, -OR', -SR', -halogen, -CN, -CONR', -COOR' or -COR', wherein R' is H, linear or branched alkyl containing 1 to 5 carbon atoms. The present invention further provides a method for preparing the compounds, a drug composition containing the compounds, and a use of the compounds. The compounds of the present invention have effects of prevention and / or treatment of infectious diseases, and can be used for preparation of antimicrobial drugs.

The invention relates to a polymerization reaction termination method, particularly a vinyl chloride monomer polymerization reaction system reaction termination method in suspension polymerization, which comprises the following steps: (1) initiating polymerization of a vinyl chloride monomer in a water phase in the presence of an initiator; and (2) when the conversion rate of vinyl chloride reaches 60-90%, adding a composition composed of a dialkyl-substituted hydroxylamine polymerization reaction terminator and an organotin heat stabilizer into the reaction system. The termination method is scientific and reasonable; and the adoption of the dialkyl-substituted hydroxylamine polymerization reaction terminator and organotin heat stabilizer can obtain the vinyl chloride resin product with quick polymerization termination effect and excellent heat stability, thereby satisfying most water-phase vinyl chloride suspension polymerization production requirements.

A process for the separation of a secondary organic nitrosonium compound and / or a secondary organic hydroxylamine compound from an acidic aqueous medium containing them in dissolved form, includes the step of bringing into contact said acidic aqueous medium with a cation exchange resin. The process is used in a process for the recovery of secondary organic nitroxy compounds from an aqueous medium containing the nitroxy compound and oxidation processes for hydroxy compounds.

Methods to prevent, inhibit, or slow the development of vitrectomy-induced cataracts are disclosed. The methods comprise administering to the eye of a subject a composition comprising an ophthalmologically acceptable carrier or diluent and at least one hydroxylamine compound in a therapeutically sufficient amount to prevent, inhibit, or slow the development of a vitrectomy-induced cataract in the subject to which the composition is administered.

The invention relates to a writing printing material capable of being repeatedly used, in particular to water writing paper capable of being repeatedly used, and colors develop when the water writing paper encounters water. The water writing paper is composed of a base body material and a color developing component, wherein the color developing component comprises a color developing agent and a color former. The color developing agent is an organic compound or an inorganic compound, which can be alkaline when encountering water, such as an amine compound, an imine compound, a hydroxylamine compound, an amide compound, a hydrazine compound, a nitrogen heterocyclic ring compound, trinitride and an aluminosilicate inorganic polymer. The color former is an acid-base indicator which can generate a chemical reaction under the alkaline condition so as to change the color obviously; when water is removed, the color developing agent and the color former can reversibly restore to the states before reactions, and with the color restores to the initial color, repeated utilization can be achieved. The color developing speed is high, the contrast before and after color developing is high, and different colors can develop with adoption of different color formers.

Methods for the inhibition of complement activation, for the treatment of complement-mediated pathologies, and for the treatment of drusen-mediated pathologies are disclosed. The methods utilize hydroxylamine compounds and ester derivatives thereof, administered to subjects in effective amounts.

The invention relates to a polymerization inhibitor for preventing alkyne polymerization, and aims to solve the problems that in the natural gas partial oxidation process for producing acetylene, the alkyne polymerization happens easily, the system and pipelines are obstructed, and the normal operation of devices is influenced. The polymerization inhibitor is composed of the following components in percentages by weight: 50 to 60 wt% of component A namely hydroxylamine compounds or / and morpholine compounds, 20 to 30 wt% of component B namely pyridine or / and nitropyridine, and 10 to 20 wt% of component C namely acylhydrazone compounds. The provided polymerization inhibitor well solves the technical problems mentioned above, and can be applied to natural gas partial oxidation process for producing acetylene so as to prevent alkyne polymerization.

The invention relates to an oxazolo[5,4-d]pyrido[1,2-a]pyrimidone derivative and application thereof. Ethyl cyanoacetate is used as a raw material, a hydroxylamine compound (A) is generated under the action of sodium nitrite and phosphoric acid, 2-amino ethyl cyanoacetate (B) is obtained through reduction with sodium hydrosulfite, the 2-amino ethyl cyanoacetate (B) reacts with different substituted acyl chlorides under alkali conditions, and oxazole compounds (D1-D48) of different substituted 5-amino-4-formate are generated under the action of trifluoroacetic acid, and then react with valerolactam under the action of phosphorus oxychloride to obtain the oxazolo[5,4-d]pyrido[1,2-a]pyrimidone compounds (E1-E48). The inhibitory activity of the 48 compounds on Hela cervical cancer cells, MCF-7 breast cancer cells and A549 lung cancer cells is investigated, and the result shows that 11 compounds have the inhibitory activity on the Hela cervical cancer cells; eight compounds have inhibitory activity on MCF-7 breast cancer cells; and five compounds have inhibitory activity on A549 lung cancer cells. E32, E33, E45, E46 and E47 have inhibitory activity on three tumor cells; and E29 and E42 have inhibitory activity on Hela cervical cancer cells and MCF-7 breast cancer cells.