6208 results about "Oxalic acid" patented technology

This invention provides an amorphous oxide semiconductor thin film, which is insoluble in a phosphoric acid-based etching solution and is soluble in an oxalic acid-based etching solution by optimizing the amounts of indium, tin, and zinc, a method of producing the amorphous oxide semiconductor thin film, etc. An image display device (1) comprises a glass substrate (10), a liquid crystal (40) as a light control element, a bottom gate-type thin film transistor (1) for driving the liquid crystal (40), a pixel electrode (30), and an opposing electrode (50). The amorphous oxide semiconductor thin film (2) in the bottom gate-type thin film transistor (1) has a carrier density of less than 10+18 cm−3, is insoluble in a phosphoric acid-based etching liquid, and is soluble in an oxalic acid-based etching liquid.

The invention discloses a method for preparing diethyl oxalate by CO coupling reaction. By applying a gas phase method, CO is coordinated with ethyl nitrite and is catalyzed by bimetallic supported catalyzer to couplingly generate crude diethyl oxalate, the reaction is a self-sealing circulation process, the CO gas mixed with the ethyl nitrite coming from a regeneration reactor is preheated and then enters into a coupling reactor, after the reaction, the gas is separated by condensation, so that the colorless and transparent condensed diethyl oxalate liquid is produced, and the uncondensed gas containing NO enters into the regeneration reactor to react with ethanol and oxygen in order to generate ethyl nitrite which is again circulated back to the coupling reactor for continuous use. The invention is carried out on the basis of previous laboratory research and under the background of industrial production and fulfils the continuous run examination of the bench scale test and pilot magnification under the condition of industrial operation, the temperature of the coupling reaction is low, and the concentration of products is increased. The method has the advantages of more energy saving, no pollution and high benefit. The total conversion rate of the CO generated by reaction is one hundred percent, and the selectivity of diethyl oxalate is over ninety six percent.

A lithium battery includes an electrolyte comprised of a non-aqueous solvent, and a salt mixture. The salt mixture includes an alkali metal electrolyte salt and an additive salt having an anion of a mixed anhydride of oxalic acid and boric acid. Specific additive salts include lithium bis(oxalato) borate and lithium oxalyldifluoroborate. Particular electrolyte salts comprise LiPF6 and LiBF4. The additive salt is present in an amount of 0.1–60 mole percent of the total of the additive salt and electrolyte salt content of the electrolyte. Also disclosed is a method for enhancing the performance characteristics of a lithium battery through the use of the electrolyte composition. Also disclosed is the compound lithium oxalyldifluoroborate.

The invention relates to a method of preparing a solution containing colloidal particles which contain crystalline titanium dioxide wherein one or more hydrolysable titanium-containing compound(s) is stabilised by oxalic acid in a reaction medium. The reaction further relates to the preparation of titania materials (including particulate materials, coating solutions and films) which comprise or include anatase phase titania, and so are suitable in photocatalytic applications. The invention also deals with a method of preparing B-phase titania.

This invention encompasses methods of producing a colored oxide layer on an aluminum material by anodizing the aluminum material in an electrolyte comprising water, sulfuric acid and oxalic acid. The anodizing step comprises passing at least two sequential current densities through the electrolyte. Methods of making and using article with a colored oxide layer on an aluminum material make by the methods disclosed herein are also disclosed.

The invention relates to an improver for saline-alkali soil. The improver comprises a powder agent and a water agent, wherein the powder agent comprises the following components: organic matters, plant mycelium protein powder, active calcium, calcium superphosphate, aluminum sulfate, fatty alcohol polyoxyethylene ether ammonium sulfate, amino acid powder, bacillus subtilis and photosynthetic bacteria, and the water agent comprises the following components: citric acid, fulvic acid, humic acid, malic acid, maleic acid, fumaric acid, L-tartaric acid, pyrophosphoric acid, humic acid, lactic acid, oxalic acid, salicylic acid, sodium ion adsorbent, Tween-80 and water. The improver disclosed by the invention can improve the soil from multiple angles, namely soil structure, microorganism species, a chemical method and the like, obviously promote the release of iron and phosphorus in the soil, improve the soil structure, effectively reduce the content of sodium ions in the soil, reduce the pH value of the soil and restore land to a normal planting state after being used continuously for two years.

The invention relates to a catalyst for hydrogenation of dimethyl oxalate to prepare methyl glycolate, a preparation method and application thereof. The catalyst is prepared by using Cu as main active component and using one or more of Ag, Mg, Au, Ru, Rh, Pd, Pt, Re, Ni, Co, Cr, Zn and Zr as additive through a urea decomposition-homogeneous coprecipitation process, wherein the mass fraction of Cuis 0 to 30 percent, the mass fraction of the additive is 0 to 20 percent, and the rest is carrier silica. The method for preparing the catalyst is simple, and good in synthesis repetitiveness, and when being applied for hydrogenation of dimethyl oxalate to prepare methyl glycolate, the catalyst is high in activity and stability, and the selectivity of methyl glycolate is high.

The present invention relates to the preparation of hyperstable Y-type RE molecular sieve for the catalytic cracking of heavy oil and containnig vanadium resisting component. The preparation uses NaY-type molecular sieve as main material and chemical aluminum-eliminating complex containing oxalic acid and / or oxalate and its mixture and through introducing RE ion in the late stage of chemical aluminum elimination reaction to from RE precipitate and hydrothermal treatment to realize hyperstabilizing and introduce RE ion and independent phase Re oxide. The formed precipitate RE precursor includes RE oxalate. Compared with conventional REY, REHY and REUSY, the molecular sieve preparing process is simple and high in RE utilization, and has homogeneously distributed aluminum, more secondary pores high hydrothermal stability, high activity and high vanadium contamination resisting capacity.

The invention relates to acid solution used for processing the magnesium alloy surface. The acid solution is water solution which contains acids, inhibitor and wetting agent, wherein, the acids are first acids or mixture of first acids and second acids; the first acids are selected from one type or a plurality of types among citric acids, oxalic acids, tartaric acids, methanoic acids, acetic acids, metacetonic acids, butyric acids, glutaric acids, phenylformic acids, benzene dicarboxylic acids, lactic acids, glycolic acids, glyoxylic acids and amino acids; and the second acids are hydrochloric acids and / or nitric acids. By adoption of the acid solution, the magnesium alloy surface can be fully activated; the membranous layer of a converting film which is formed on the magnesium alloy surface after chemical conversion process is compact, has erosion resistance and good binding force with a paint film. Moreover, the method is a environment-friendly method for processing the magnesium alloy surface.

The invention discloses a technological method for preparation of sphere-shaped ultrafine metallic powders through hydro-thermal treatment, which relates to a technological method for preparation of sphere-shaped ultrafine nickel powders or ultrafine cobalt powders through the procedures such as precipitation, dispersing agent surface finish, high-pressure hydro-thermal treatment, washing, drying and high-temperature hydrogen reduction and the like, and which belongs to the technical field for preparation of metal powder materials. The technological method adopts water soluble salts with nickel and cobalt, cobalt oxide, sub-carbonate, carbonate or hydroxide as raw materials, which are prepared into water solution after processing, the dispersing agent is added, then nickel ion and cobalt ion in the water solution are precipitated through alkali, carbonate, oxalic acid or ammonium oxalate and the like, the hydro-thermal treatment of water pulp of the precipitate is performed in an autoclave, and products of sphere-shaped ultrafine nickel powders or ultrafine cobalt powders with even graininess and good dispersibility can be obtained through washing, drying and high-temperature hydrogen reduction. The technological method is not only suitable for medium- and small-scale discontinuous-type manufacture, but also used for large-scale continuous manufacture, and the manufacturing cost is low.

The present invention relates to ALD processes for deposition of a metal selected from Pd, Rh, Ru, Pt and Ir wherein a layer including the metal is formed on a surface composed of a material selected from W, Ta, Cu, Ni, Co, Fe, Mn, Cr, V Nb, tungsten nitride, tantalum nitride, titanium nitride, dielectrics and activated dielectrics at a temperature ranging from >60° C. to <260° C. The layer is formed by sequentially pulsing into a chamber containing the surface a precursor for the metal and a reducing gas selected from hydrogen, glyoxylic acid, oxalic acid, formaldehyde, 2-propanol, imidazole and plasma-activated hydrogen.

A method of manufacturing a metal oxide semiconductor comprising the step of: conducting a transformation treatment on a semiconductor precursor layer containing a metal salt to form the metal oxide semiconductor, wherein the metal salt comprises one or more metal salts selected from the group consisting of a nitrate, a sulfate, a phosphate, a carbonate, an acetate and an oxalate of a metal; and the semiconductor precursor layer is formed by coating a solution of the metal salt.

The invention relates to an intensive anodic oxidation process to prepare porous anodic alumina film. An aluminum sheet is as an anode; a platinum sheet as a cathode; argon as shielded gas; mixed solution of perchloric acid with absolute alcohol as electrochemical polishing compound for the aluminum sheet; mixed solution of oxalic acid, absolute alcohol and deionized water as electrolyte; and mixed solution of phosphoric acid, chromic acid and deionized water as alumina film corrodent. Through aluminum sheet annealing, purging, electrochemical polishing, mild anodic oxidation, corrosion on aluminum sheet oxide film, intensive anodic oxidation and stripping oxide film, and finally, pale yellow, high purity and ordered porous-structured nanometer-leveled alumina film is achieved; The alumina film pore is in circular shape sized in 30 to 35nm, pore distance in 80 to100nm and pore depth in 162.4 micrometers; growth rate of the alumina film is 54 micrometers / h, which is 27 times higher than 2 micrometers / h of growth rate of anodic oxidation aluminum film prepared through mild anodic oxidation process.

A combined rapid acting-long acting insulin formulation has been developed wherein the pH of the rapid acting insulin is adjusted so that the long acting glargine remains soluble when they are mixed together. In the preferred embodiment, this injectable basal bolus insulin is administered before breakfast, provides adequate bolus insulin levels to cover the meal, does not produce hypoglycemia after the meal and provides adequate basal insulin for 24 hours. Lunch and dinner can be covered by two bolus injections of a fast acting, or a rapid acting or a very rapid acting insulin. As a result, a patient using intensive insulin therapy should only inject three, rather than four, times a day. Experiments have been performed to demonstrate, the importance of the addition of specific acids to hexameric insulin to enhance speed and amount of absorption and preserve bioactivity following dissociation into the monomeric form by addition of a chelator such as EDTA. As shown by the examples, the preferred acids are aspartic, maleic, succinic, glutamic and citric acid. These are added in addition to a chelator, preferably ethylenediaminetetraacetic acid (EDTA). The results show that the citric acid formulation was more effective at dropping the blood glucose rapidly than the identical rapid acting formulation prepared with HCl in swine. Charge masking by the polyacid appears to be responsible for rapid insulin absorption. EDTA was not effective when used with adipic acid, oxalic acid or HCl at hastening the absorption of insulin. These results confirm the results seen in clinical subjects and patients with diabetes treated with the rapid acting insulin in combination with citric acid and EDTA.

Provided is a non-tea-based, packaged beverage which includes a sour seasoning, contains catechins at high concentration, and even after stored over along term, can still give a refreshing feeling specific to a sour taste. The non-tea-based, packaged beverage is free of the persistence of a sour taste, which is experienced when taken in sport scenes, and is excellent in mouth refreshment. Even in a form filled in an oxygen-permeable, clear container, the non-tea-based, packaged beverage shows excellent color tone stability. The non-tea-based, packaged beverage contains a purified product of green tea extract added to it. The purified product comprises non-polymer catechins in its solid constituents and has a content weight ratio of (B) oxalic acid to (A) the non-polymer catechins [(B) / (A)] in a range of from 0 to 0.002. The non-tea-based, packaged beverage comprises the following ingredients (A) to (D): (A) from 0.03 to 0.6 wt % of non-polymer catechins, (B) oxalic acid or a salt thereof at an ingredient (B) / ingredient (A) of from 0 to 0.02, (C) caffeine at an ingredient (C) / ingredient (A) weight ratio of from 0 to 0.16, and (D) from 0.03 to 1.0 wt % of a sour seasoning, and has a pH of from 2 to 6.

The invention relates to a method for preparing lyophobic SiO2 aerogel, belonging to the technical field of new material preparation. The method comprises the steps: tetraethyl orthosilicate, absolute ethyl alcohol and oxalic acid solution are firstly mixed in a container for sealing, and then the mixed solution is put into water bath, hydrolyzed under agitation and added with ammonia dropwise; when gel is formed, the absolute ethyl alcohol is added into the gel for exchanging the water in the gel; n-hexane is used for exchanging ethanol in the gel; wet gel which is processed by solvent exchange and aging is dipped into the mixed solution of modifying agent and n-hexane for surface modification, then the n-hexane is added for exchanging the unreacted modifying agent; finally, a test tube is sealed by a aluminum foil provided with a needle hole and is placed into an oven for classified drying under normal pressure, so that the modified SiO2 aerogel is obtained. The SiO2 aerogel prepared by the method has the advantages of high porosity, large specific surface area, good hydrophobic property, etc. The method has the advantages of mild reaction condition, easy control of the reaction as well as simple and convenient process flow.

The invention discloses a process method for preparing an ultra-hydrophobic surface by the electrochemical method. The process adopts two processing steps: forming the micro nanometer double-structurerough surface by first electrochemical etching and then oxalic acid anodic oxidation; and preparing the ultra-hydrophobic surface by modifying the surface with fluorosilane. The method is simple andpractical, uses mature electrochemical etching and anodic oxidation technology, allows for easy mass production and avoids environmental pollution.

An aqueous metal etching composition useful for removal of metals such as nickel, cobalt, titanium, tungsten, and alloys thereof, after formation of metal silicides via rapid thermal annealing during complementary metal-oxide-semiconductor (CMOS) transistor fabrication. The aqueous metal etching composition is also useful for selective removal of metal silicides and / or metal nitrides for wafer re-work. In one formulation, the aqueous metal etching composition contains oxalic acid, and a chloride-containing compound, and in other formulations, the composition contains an oxidizer, such as hydrogen peroxide, and a fluoride source, e.g., borofluoric acid. The composition in another specific formulation contains borofluoric acid and boric acid for effective etching of nickel, cobalt, titanium, tungsten, metal alloys, metal silicides and metal nitrides, without attacking the dielectric and the substrate.

The invention relate to a method of extracting scandium from red mud, the method utilize the red mud that come from the process of producing aluminum oxide from alumyte, in accordance with specific characteristics of red mud, applying hydrochloric acid leach, P204 abstraction, acid-washing edulcoration, sodium-hydroxide back extraction, ammonia modifier hydrolytic decomposition zirconium and titanate in hydrochloric acid solution, oxalic acid precipitating scandium and medium temperature calcining technique, the purity of final production Sc2O3 is 99.9%. Extracting scandium from red mud change refuse into available material, save mineral resources, benefiting environmental conservation. The invention also fills up the study vacant of isolation technique in high-strength zirconium titanate and scandium.

The invention relates to an E0-grade melamine modified urea-formaldehyde resin adhesive, and a preparation method and application thereof. The E0-grade melamine modified urea-formaldehyde resin adhesive is characterized by comprising an E0-grade melamine modified urea-formaldehyde resin, a composite curing agent and a composite filler, wherein the E0-grade melamine modified urea-formaldehyde resin is prepared from the following raw materials in parts by mass: 100 parts of formaldehyde, 0.1-0.5 part of polyvinyl alcohol, 100-200ml of basic catalyst and 200-400ml of acidic catalyst; the mol ratio of the formaldehyde to the urea+melamine (F / (U+M)) is equal to 0.80-0.98; the composite curing agent is prepared from the following raw materials in parts by mass: 200-250 parts of ammonium chloride, 150-200 parts of oxalic acid, 400-450 parts of citric acid, 100-150 parts of tartaric acid and 500-800 parts of water; and the composite filler is prepared from the following raw materials in parts by mass: 60 parts of industrial flour, 20 parts of 800-mesh light calcium carbonate and 20 parts of 800-mesh wood meal. The E0-grade melamine modified urea-formaldehyde resin adhesive is used for gluing plates. The E0-grade melamine modified urea-formaldehyde resin adhesive has the advantages of low free formaldehyde content, low cost, favorable precompression performance, good gluing performance and the like.

The invention provides a method for reclaiming a rare earth element from abandoned fluorescent lamp. The invention is characterized in that the method comprises the following steps of: melting fluorescent powder by NaOH or KOH and adding water into an alkali melted substance to produce water insoluble substances and alkaline filtrate; dissolving the water insoluble substances into hydrochloric acid to produce neutral filtrate; extracting the neutral filtrate by P204 or P507 to produce extraction liquid and raffinate; back extracting the extraction liquid by HCl to produce back-extraction liquid, and precipitating the back-extraction liquid by H2C2O4 or NH4HCO3 to produce rare earth precipitate containing mixed Y, Ce, Tb and Eu; precipitating the raffinate by the NH4HCO3 to produce precipitate containing Mg, Ba and Sb; adjusting the pH value of the alkaline filtrate to between 3 and 5 to produce Al(OH)3 precipitate and manganiferous filtrate; washing, filtering and calcining the Al(OH) precipitate to produce alumina; and adding oxalic acid into the manganiferous filtrate to produce manganous carbonate. The method realizes that the rare earth element, Eu, Tb, Ce and Y are separated from Mg, Ba, Ca and other alkaline-earth metals, ensures that resources are comprehensively reclaimed and used, and has the advantages of reasonable process flow, economy and practicality.

The invention discloses a making method of high-hydrophilicity alumina film, which comprises the following steps: adopting electrochemical polished aluminium foil as anode and platinum piece as cathode; selecting one of sulfuric acid, oxalic acid phosphoric acid with water or poor water (the composite solution of oxalic alcohol and water) as electrolyte solution; using electrochemical oxidizing method to strip aluminium base; removing damping layer; obtaining the product with different shapes and areas.

The present invention relates to a ZSM-5 mesoporous molecular sieve catalyst used for manufacturing propylene by methanol and a preparation method thereof, which mainly solves the problems of low propylene selectivity, low propylene / ethylene mass ratio as well as poor thermal stability of molecular sieve and poor water thermal stability in the prior art. The present invention adopts the technical proposal of adopting ZSM-5 mesoporous molecular sieve raw powder with a silicon-aluminum mol ratio SiO2Al2O3 of 20 to 1000 and a weight percentage of 20 to 100 percent as well as at least one caking agent selected from SiO2, clay and Al2O3 to extrude, tablet or spray into shape; then treating for 1 to 8 hours by 0.1 to 3 mol / l of at least one ammonium liquor from ammonium nitrate, ammonium chloride or ammonium sulphate or 0.1 to 8.5 mol / l of at least one acid liquor from muriatic acid, nitric acid, vitriol or acetic acid under a temperature of 20 to 90 DEG C; then using steam to treat for 2 to 15 hours under the temperature condition of 400 to 700 DEG C; using a liquor of 0.1 to 3mol / l selected from at least one of oxalic acid, citric acid or maleic acid under a temperature condition of 20 to 90 DEG C to dip for 2 to 5 hours to obtain the modified molecular sieve catalyst, thus better solving the problems. The present invention can be used in the industrial production of propylene by being converted from methanol.

The invention relates to a method for modification of a biocompatible component comprising the steps of a) providing a biocompatible component at least partly covered by metallic oxide; and b) treating at least a part of said component, which part is covered by said metallic oxide, with an aqueous composition comprising oxalic acid; whereby a modified metallic oxide is obtained. The invention also relates to a biocompatible component comprising a substrate having a surface comprising a) a microstructure comprising pits separated by plateus and / or ridges; and b) a primary nanostructure being superimposed on said microstructure, said primary nanostructure comprising depressions arranged in a wave-like formation.

The invention relates to the field of chemical technology, in particular to a method for preparing a catalyst for hydrogenating dimethyl oxalate to prepare glycol. The method comprises the following steps: step one, copper nitrate is used to prepare a cuprammonium complex compound; step two, the cuprammonium complex compound is added with a mesoporous silica molecular sieve, is dripped with distilled water, and is filtered, washed, dried and roasted to prepare a catalyst precursor; and step three, the catalyst precursor is reduced in a hydrogen-nitrogen mixed atmosphere to prepare the catalyst. In the catalyst, according to mass percentage, the content of copper is between 5 and 40 percent; and the content of the mesoporous silica molecular sieve is between 60 and 95 percent. The method has the advantages that a silicon copper catalyst prepared through the new method has high catalytic activity and glycol selectivity in the reaction of hydrogenating the dimethyl oxalate to prepare the glycol, has long service life, smooth reaction performance and easy control.

A method for recovering lead oxide by a waste lead-acid storage battery is disclosed. The waste lead-acid storage battery is crushed together with lead slime subsequent to acid cleaning, a grid plate and a filler comprising the lead slime are obtained by screening, the grid plate is fused-cast to an alloy ingot, the filler and the lead slime are ball-milled, and fine stuff is added with saturated oxalic acid solution for reaction at 25-65 DEG C and then for filtering and depositing; the deposition is then treated by excessive 30% nitric acid at the temperature of 40-45 DEG C for subsequent filtration and deposition, and the deposition is reacted with 4wt% sal volatile at the temperature of 25-65 DEG C for subsequent filtration and deposition; the deposition is added into recovered HNO3 to be dissolved at the temperature 40-45 DEG C until no bubble is generated, the filtered filtrate is added with 25% ammonia for reaction, filtration, washing and deposition to be neutral, and the lead oxide is obtained by drying and roasting. Recoverable nitramine and ammonium sulfate are recycled in all the filtrates in the technologies; thereby discharging no waste liquid. The utilization rate of raw material is 90.1-92.1%, the yield is 95.0-96.7%, and the content of PbO is 98.0-98.9%.

The present invention is based upon the discovery that nontitanyl oxalates can enhance the catalytic functionality of titanyl oxalate catalysts. This invention provides a novel catalytic composition containing a titanyl oxalate catalyst and a metallic oxalate catalyst enhancer and optionally containing a metallic cocatalyst such as an antimony based catalyst. A synergistic relationship has been discovered between titanyl oxalate catalyst and the catalyst enhancer. A synergistic relationship has also been discovered between the titanyl oxalate catalyst, catalyst enhancer and a metallic cocatalyst such as antimony oxide or antimony triacetate. Also provided is an improved process of producing polyester by the polycondensation of polyester forming reactants in the presence of a catalytically effective amount of a polycondensation catalyst, wherein the improvement comprises utilizing, as the polycondensation catalyst, the novel catalyst composition containing a titanyl oxalate such as lithium titanyl oxalate and a catalyst enhancer such as a nontitanyl metallic oxalate like lithium oxalate and optionally containing a metallic catalyst such as antimony oxide or antimony triacetate. The improved process produces an improved polyester having lower acetaldehyde numbers and good color. The titanyl oxalate / catalyst enhancer composition can be used as a polycondensation catalyst in combination with other catalysts to achieve synergistic catalytic activity. Preferred is a combination of lithium or potassium titanyl oxalate, Li2 or K2TiO(C2O4)2, lithium or potassium oxalate, Li2 or K2(C2O4)2 with antimony oxide or antimony triacetate or antimony trisglycoxide.

A combined rapid acting-long acting insulin formulation has been developed wherein the pH of the rapid acting insulin is decreased so that the long acting glargine remains soluble when they are mixed together. In the preferred embodiment, this injectable basal bolus insulin is administered before breakfast, provides adequate bolus insulin levels to cover the meal, does not produce hypoglycemia after the meal and provides adequate basal insulin for 24 hours. Lunch and dinner can be covered by two bolus injections of a fast acting, or a rapid acting or a very rapid acting insulin. As a result, a patient using intensive insulin therapy should only inject three, rather than four, times a day. Experiments have been performed to demonstrate the importance of the addition of specific acids to hexameric insulin to enhance speed and amount of absorption and preserve bioactivity following dissociation into the monomeric form by addition of a chelator such as EDTA. As shown by the examples, the preferred acids are aspartic, glutamic and citric acid. These are added in addition to a chelator, preferably ethylenediaminetetraacetic acid (EDTA). The results show that the citric acid formulation was more effective at dropping the blood glucose rapidly than the identical rapid acting formulation prepared with HCl in swine. Charge masking by the polyacid appears to be responsible for rapid insulin absorption. EDTA was not effective when used with adipic acid, oxalic acid or HCl at hastening the absorption of insulin. These results confirm the results seen in clinical subjects and patients with diabetes treated with the rapid acting insulin in combination with citric acid and EDTA.