105 results about "Glyoxylic acid" patented technology

The invention relates to the technical field of polymer electrolyte, in particular to a self-repairing type gel polymer electrolyte membrane, a preparation method and application in an energy storage battery, the self-repairing type gel polymer electrolyte membrane is prepared by the following steps: dissolving amino-terminated polyethylene glycol in an organic solvent, adding trimesic acid under the protection of an inert atmosphere, heating, stirring and reacting to form a pre-polymerized solution, cooling, and then adding trimesic acid into the pre-polymerized solution to prepare a self-repairing type gel polymer electrolyte membrane; the preparation method comprises the following steps: adding glyoxylic acid and glacial acetic acid, carrying out a constant temperature reaction to obtain a solution A, adding LiTFSI into the solution A, carrying out ultrasonic dispersion to a homogeneous phase, pouring the obtained slurry onto a template, and carrying out a drying curing reaction to obtain the self-repairing gel polymer electrolyte membrane. A rigid aromatic cross-linking agent is used for inhibiting polymer crystallization and improving mechanical integrity, an imine bond-based dynamic covalent network is introduced to realize an autonomous interface repairing function at the working temperature of the battery, and meanwhile, a polyethylene glycol ether oxygen chain is used for constructing an efficient lithium ion transmission channel; therefore, the technical boundary that the conductivity, the mechanical strength and the interface stability of the traditional GPE are difficult to collaboratively optimize is broken through.

The invention discloses a liquid chromatography determination method for a mixed solution of glyoxylic acid, glycollic acid and oxalic acid and application. The method comprises the following steps: (1) preparing standard solutions with different concentrations; (2) detecting the standard solutions with different concentrations by using high performance liquid chromatography; (3) establishing a linear regression equation of each acid according to the relationship between the concentration of the standard solution and the corresponding peak area; (4) pre-treating a sample to be detected, detecting under the same condition as that in the step (2) by using high performance liquid chromatography, and recording the peak area of each acid in the sample to be detected; and (5) substituting the peak area of each acid in the to-be-detected sample into the corresponding linear regression equation, and calculating to obtain the concentrations of glyoxylic acid, glycollic acid and oxalic acid in the to-be-detected sample. The method is a liquid chromatographic determination method which is simple and convenient to operate, excellent in separation effect, mild in chromatographic condition and compatible with various detectors, can accurately quantify three strong-polarity mixed acids of glyoxylic acid, glycollic acid and oxalic acid, and has important practical application value.

The invention belongs to the technical field of impurity separation, and particularly discloses a method for separating and purifying impurities in a process for preparing glyoxylic acid through oxalic acid electrolysis, a crystallization kettle is included, an isolation device is arranged in the crystallization kettle, and the isolation device comprises a conical top cover, a conveying pipe, an annular filter screen, a directional conveying assembly and a sealing assembly; the conical top cover is arranged at the axis of the crystallization kettle, an opening of the conical top cover faces downwards, and a plurality of fixing rods are fixedly connected between the top of the conical top cover and the inner wall of the side face of the crystallization kettle. According to the method, glyoxylic acid product solutions with different concentration specifications and the high-purity glyoxylic acid crystal can be obtained after the electrolyte is sequentially subjected to pre-evaporation, electrodialysis, secondary evaporation, cooling crystallization, solid-liquid separation, washing and drying and other procedures, so that the prepared high-purity glyoxylic acid crystal can be popularized and applied in the field of high-end medicine.

The invention discloses a preparation method of a biomass hard carbon negative electrode material, which is characterized by comprising the following steps: carrying out primary carbonization on a biomass material, sequentially introducing a phosphorus element, a boron element and a copper element, carrying out secondary carbonization on a modified hard carbon raw material, and introducing carbonyl to obtain the hard carbon negative electrode material. Preliminary carbonized powder, boric acid and phosphoric acid are added into a reaction kettle together for a low-temperature graphitization reaction, phosphorus and boron are introduced for a hard carbon raw material, the phosphorus can widen the spacing of a graphite layer, the boron can catalyze rearrangement of a graphitized carbon layer, then the hard carbon raw material and organic copper salt are mixed and ground in cooperation, secondary carbonization is conducted, and the hard carbon material is obtained. By introducing the copper element, graphitization of the product can be promoted, and meanwhile, copper atoms can also improve the conductivity; and glyoxylic acid is added to introduce carbonyl into the product, and the carbonyl can preferentially catalyze decomposition of the inorganic salt, so that decomposition of an organic solvent is inhibited, and then a uniformly distributed inorganic salt-rich SEI film is formed.

The application discloses a kind of corrosion and scale integrated fracturing fluid, and relates to fracturing fluid technical field.The fracturing fluid includes thickening agent, crosslinking agent, composite corrosion and scale inhibitor and water;The composite corrosion and scale inhibitor includes the first component and the second component with mass ratio of 3:0.5~1, wherein the first component is prepared by the reaction of polyethyleneimine, long-chain acrylate monomer, acrylic acid monomer and hydroxyethyl acrylate monomer, and the second component is prepared by imidazole compound containing a primary amine and glyoxylic acid.The corrosion and scale integrated fracturing fluid of the application has good compatibility between components, and at the same time, it has good corrosion and scale inhibition and anti-sloughing performance.

A method of making paper and paperboard products, including absorbent structures, where the method includes mixing ultra-high molecular weight (“UHMW”) glyoxalated polyvinylamide (“GPVM”) adducts and high molecular weight (“HMW”) anionic polyacrylamide (“APAM”) with the furnish during stock preparation of a wet laid papermaking process.

The present invention relates to a process for the preparation of polyaminocarboxylic acids, in particular phenolic aryl- or alkyldiaminepolycarboxylic acids, preferably a compound of formula (I): wherein X is selected from the group consisting of: H, COOH, COO−Y+, OH, linear or branched C1-C5 alkyl, CH2OH, SO3H, SO3−Y+, wherein: —Y+ is independently selected from the group consisting of: Li+, Na+, K+, and NH4+; and wherein A is selected from: −A (CH2)n linear aliphatic system, wherein n=2, 3 or 4, preferably 2 or 3; and—an aromatic system of formula (II): wherein R1, R2 are independently selected from the group consisting of H, OH, and linear or branched C1-C5 alkyl; said process comprising the step of reacting, a phenol compound, glyoxylic acid and an aryl- or alkyldiamine in the presence of an iron source to obtain a reaction mixture comprising the compound of

This invention provides a method for synthesizing a sulfonylpyrazole intermediate, belonging to the field of herbicide intermediate preparation technology. The method includes a condensation reaction of glyoxylic acid and hydroxylamine to generate 2-(hydroxyimino)acetic acid, followed by a chlorobromination reaction of the 2-(hydroxyimino)acetic acid to generate a chlorobromination intermediate. The chlorobromination intermediate then reacts with isobutylene to generate a sulfonylpyrazole intermediate. The key feature is that the chlorobromination reaction is carried out in the presence of sodium bromide and chlorine. This invention can maintain a stable reaction environment while improving the yield and purity of the intermediate product.

This invention belongs to the field of conductor materials technology, and relates to a conductor paste for LED chip packaging and its preparation method. The invention provides a method for preparing a conductor paste, comprising: mixing copper powder and deionized water at a mass ratio of 1:5 to 1:7, dispersing evenly, adding triallyl citrate and sodium glyoxylate, and heating at 55-60°C for 1-2 hours; then adding γ-methacryloyloxypropyltrimethoxysilane and heating at 45-50°C for 1-2 hours; finally, vacuum drying to obtain antioxidant copper powder; and mixing the antioxidant copper powder, resin binder, solvent, and additives evenly to obtain the conductor paste. The conductor paste provided by this invention has excellent conductivity, good adhesion to LED chip substrates, and is not easily oxidized at high temperatures. This invention solves the technical problem of excessive sheet resistance in conductor pastes obtained by coating copper powder with γ-methacryloyloxypropyltrimethoxysilane to improve its antioxidant properties.

This invention proposes a method for synthesizing glyoxylic acid from methyl glycolate. Using methyl glycolate and oxygen / water as raw materials, glyoxylic acid is produced in a one-step process. This invention employs a novel catalyst based on ZSM-5 molecular sieve, modified with transition metals and organic bases, and finally extruded into strips. This catalyst can catalyze both oxidation and hydrolysis. This route is characterized by its simplicity, high reactivity, and high catalytic selectivity, making it a green route for glyoxylic acid synthesis.

This invention discloses a crystallization method for glyoxylic acid monohydrate, comprising the following steps: Step 1: Adding seed crystals to a drum granulator, the seed crystal mass being 9 times the mass of an 80% glyoxylic acid solution; Step 2: Adding the 80% glyoxylic acid solution to the drum granulator through spray guns located at the feed end of the drum granulator. The maximum flow rate of each spray gun is 2 t / h, and each spray gun is equipped with two solid conical atomizing nozzles with a solid cone angle of 55-60°. The number of spray guns is selected according to the production scale. This invention, by adding seed crystals at a mass of 9 times the mass of an 80% glyoxylic acid solution, allows the atomized 80% glyoxylic acid solution to mix with the seed crystals within the drum granulator, achieving rapid agglomeration and hardening of the mixture within a short time. After crystallization, the mixture is cooled. The product is graded according to particle size, with intermediate grades directly packaged. The implementation scheme is highly operable and economical to operate; it can be operated continuously and is suitable for large-scale industrial continuous production.

The invention belongs to the technical field of organic synthetic chemistry, and discloses a preparation method of an aromatic ketone compound, which comprises the following steps: by taking an unsaturated carbonyl compound obtained by condensing aryl acetaldehyde / acid and aldehyde / ketone molecules as a precursor, carrying out a reaction on the unsaturated carbonyl compound in the presence of a free radical precursor and molecular oxygen under the conditions of illumination and / or heating to obtain the aromatic ketone compound. And carrying out free radical mediated decarbonylation functionalization reaction in an organic solvent to obtain the aromatic ketone compound. The functional group contained in the free radical precursor is introduced to the alpha position of the ketone compound. By improving reaction participants and a reaction mechanism, the aromatic ketone compounds with various structures can be efficiently and highly selectively constructed in one step, the functionalization of the alpha position of the aromatic ketone compounds is synchronously realized, and the preparation method which is simple and convenient to operate, high in atom economy, green and environment-friendly is provided for the aromatic ketone compounds; the obtained compound is especially applicable to the fields of drug synthesis and synthesis of other materials.

The invention provides an aminomethylation reaction method based on a pyrazolo [1, 5-a] pyrimidine nitrogen-containing fused heterocycle substrate, a product and application, and belongs to the technical field of chemistry. Pyrazolo [1, 5-a] pyrimidine nitrogen-containing fused heterocycle, secondary amine and glyoxylic acid are used as raw materials, an aminomethylation reaction is achieved at the C3 site of pyrazolo [1, 5-a] pyrimidine through heating for the first time, a transition metal catalyst or a chemical oxidizing agent is not needed, the drug purification problem caused by metal residues and oxidation byproduct pollution are avoided, and the purity of the product is improved. The method is a novel efficient, simple, convenient and environment-friendly nitrogen-containing fused heterocyclic aromatic hydrocarbon functionalization strategy, the reaction can be directly carried out at the temperature of 100-120 DEG C, shielding gas does not need to be filled, and compared with some reactions needing high-temperature or high-pressure conditions, the mild reaction conditions are easier to control, side reactions are reduced, and the yield of the target product is increased. Meanwhile, the reaction conditions are also beneficial to reducing energy consumption, and conform to the concept of green chemistry.

The application discloses a method for industrial production of sulindac. The method comprises the following steps: condensation reaction of compound 1 (5-fluoro-2-1-(4-methylthio benzyl) indene) and glyoxylic acid under catalysis of an organic base (benzyl trimethyl ammonium hydroxide) to generate compound 2, isomerization reaction of the compound 2 under hydrobromic acid-acetic acid solution to generate compound 3, which greatly improves reaction conversion rate and yield, reduces three waste problems, and finally obtains compound 4 (sulindac crude product) through oxidation of the obtained compound 3 by hydrogen peroxide, and high-purity sulindac is obtained through recrystallization of the crude product by isopropyl alcohol. The raw materials and reagents used in the preparation process of the sulindac are relatively cheap and low in cost, the whole preparation process is mild in reaction condition, simple and safe in operation, and convenient for industrial production.

The utility model discloses a combined device for absorbing and treating glyoxylic acid synthesis reaction tail gas, and belongs to the technical field of chemical production devices and tail gas recycling. The device mainly comprises an absorption buffer tank, an A-stage absorption device, a B-stage absorption device, a C-stage absorption device, a D-stage absorption device, an induced draft fan, an activated carbon purification box, a harmless airflow outlet, a dilute nitric acid transfer tank and the like, the combined device for absorbing and treating glyoxylic acid synthesis reaction tail gas according to the technical scheme of the utility model effectively solves the problem of low absorption efficiency of a previous nitrogen oxide absorption device and the problem of low nitric acid content in absorption liquid, and is relatively beneficial to environmental protection and production cost control; the device also has the characteristics of safe process, convenience in operation and high production efficiency.

The invention relates to a method for producing a multilayer board in a cardboard machine. The multilayer board comprises at least two layers. A first fiber suspension comprising cellulosic fibers is obtained for the first layer and a second fiber suspension comprising cellulosic fibers is obtained for the second layer, the first and second fiber suspensions being different from each other and at least one of them comprising recycled cellulosic fibers. A multi-ply web is formed by combining a first ply and a second ply with each other, and then the web is wet-pressed at a press section. An acetaldehyde acidified polyacrylamide having a number average molecular weight of at least 15000 g / mol is added to the first fiber suspension and / or the second fiber suspension prior to forming the first layer and the second layer.

An object of the present invention is to provide a photosensitive composition capable of forming a pattern excellent in suppression of water stains after development and smoothness and having a small amount of change in line width.SOLUTION: Specifically disclosed is a photosensitive composition comprising a colorant (A), an alkali-soluble resin (B), a polymerizable compound (C) and a polymerization initiator (D), wherein the polymerization initiator (D) comprises a polymerization initiator (D1) represented by general formula (1) and a glyoxylate-based polymerization initiator (D2). (In General Formula (1), R1 and R2 each independently represent hydrogen atoms or alkyl groups having 1 to 8 carbon atoms. R3 represents hydrogen or a monovalent group. ) SELECTED DRAWING: Figure 1

COMPOSITIONS AND PROCESSES FOR REMOVING HAIR COLOR The disclosure relates to compositions and processes for removing color from keratinous fibers such as hair. The compositions include (a) at least one reducing agent selected from glutaric acid, glyoxylic acid, thiolactic acid, thioglycolic acid, glycolic acid, citric acid, or combinations of two or more of these, (b) at least one amino acid, (c) optionally, at least one amine compound, and (d) at least one solvent. Figure for abstract: none

COMPOSITION SUITABLE FOR KERATINOUS FIBERS The present invention relates principally to a composition for keratinous fibers such as hair, comprising: (a) at least one compound selected from the group consisting of glyoxylic acid, glyoxylic acid solvates, glyoxylic acid salts, glyoxylic acid esters, glyoxylic acid amides, and mixtures thereof; (b) at least one compound, other than (a), selected from the group consisting of keto acids, their salts, and mixtures thereof; and (c) at least one quater ester. The present invention can improve the smoothing of keratinous fibers such as hair based on heating the keratinous fibers with glyoxylic acid or one of its derivatives, providing more durable remodeling effects. Figure for abstract: none

The technical scheme of the present application discloses a continuous preparation process of industrial glyoxylic acid, and belongs to the technical field of fine organic chemical industry and glyoxylic acid synthesis. The main innovation of the present application is to introduce microfluidic technology and microporous membrane separation technology into the synthesis process, and to use a composite catalyst to catalyze the air oxidation of glyoxal to synthesize glyoxylic acid. Compared with the prior art, the present application has the following obvious beneficial effects: (1) the process is safe, continuous, fast, high in production efficiency and small in space occupation; (2) no waste water, waste gas and waste solid are produced, and the recycled water can be recycled, which is very beneficial to environmental protection and water resource saving; (3) the composite noble metal catalyst is low in consumption, and the conversion rate of glyoxal is greatly improved; and (4) the present application has the characteristics that high-content glyoxylic acid can be obtained without distillation and concentration, which is very beneficial to reducing the production cost.

As a laminate capable of being photocured with visible light and in which discoloration, foaming, peeling, and other appearance defects of the polarizing plate are not observed even in a severe high-temperature high-humidity environment, a laminate is produced as follows: [I] the layer configuration of a polarizing plate / light-curable adhesive sheet is laminated, [II] the polarizing plate has a layer configuration obtained by laminating protective films for both sides of the polarizing sheet, [III] the distance (α) of the light-curable adhesive sheet from the polarizing sheet is 80 μm or less, [IV-1] the light-curable adhesive sheet is formed from a light-curable adhesive composition containing a (meth)acrylate (co)polymer and a photopolymerization initiator (A), and [IV-2] the transmittance of the laminate at a wavelength of 390 nm is less than 90%, the transmittance at a wavelength of 410 nm is 80% or more, [IV-3] as the aforementioned photopolymerization initiator (A), the total concentration of an acyloxyphosphine-based photopolymerization initiator and a phenyl glyoxylate-based photopolymerization initiator contained in the aforementioned light-curable adhesive composition is 0.5% by mass or less.

The invention discloses a reaction extraction coupling continuous flow system and method for synthesizing glyoxylic acid in a microchannel. According to the system, a first liquid storage device is connected with a first constant flow pump, and the first constant flow pump is connected to a first micro heat exchanger; the second liquid storage device is connected with a second constant flow pump; the second constant flow pump is connected to a second micro heat exchanger; the first micro-heat exchanger and the second micro-heat exchanger are connected to an inlet of the first micro-mixer, an outlet of the first micro-mixer is connected to an inlet of the second micro-mixer, and a first micro-channel reactor is arranged between the first micro-mixer and the second micro-mixer; the third liquid storage device is connected to an inlet of the second micro-mixer through a third constant flow pump; an outlet of the second micro-mixer is connected to a collecting device, the collecting device is arranged in a temperature adjusting device, and a second micro-channel reactor is arranged between the second micro-mixer and the collecting device; according to the invention, the problem of low glyoxal synthesis reaction efficiency in the prior art is solved.

This invention discloses a method for preparing sulindac. The method involves first performing an Arbuzov reaction and a Wittig-Horner reaction sequentially to obtain 6-fluoro-3-(p-methylthiobenzyl)-2-methyl-1H-indene. 6-fluoro-3-(p-methylthiobenzyl)-2-methyl-1H-indene undergoes a condensation dehydration reaction with glyoxylic acid, followed by double bond rearrangement under acidic conditions to obtain (Z)-5-fluoro-2-methyl-1-(p-methylthiobenzyl)-1H-indene-3-acetic acid. Finally, it undergoes a single oxidation reaction with an oxidant to obtain sulindac. The raw materials and excipients used in this invention are readily available, and the entire reaction route is short, the reaction conditions are mild, the operation is safe and simple, the yield is high, the purity is high, the production cost is low, and the emissions of waste are minimal, conforming to green industrial production standards. The total yield of the obtained sulindac product is over 75%, which is conducive to industrial production.

The present invention provides the use of a re-tanning composition comprising at least one glyoxylic acid aromatic condensate compound in a leather manufacturing process that provides good re-tanning behaviour.

The application discloses a glyoxylic ester product and a preparation method and application thereof. In addition to the glyoxylic ester, the glyoxylic ester product also contains appropriate glycollic ester, oxalic monoester, acetal + hemiacetal, glyoxylic ester, polymer and water. In the process of synthesizing alpha-hydroxy-4-phenyl-4-pentenoic acid ethyl ester, the components other than the glyoxylic ester can form a combination with the ferric trichloride catalyst, and the combination is more conducive to the catalyst to play its role, promotes the reaction and improves the product yield.

An aqueous composition is provided comprising water and a cationic polymeric resin having at least one reactive aldehyde group and formed by the reaction of glyoxal with a polymer. The polymer comprises at least one acrylamide repeat unit and at least one cationic repeat unit, wherein the number of equivalents of reactive aldehyde divided by the number of equivalents of residual glyoxal is greater than about 1.2 based on the total weight of the polymer, wherein the polymer has greater than about 50 mole percent acrylamide repeat units and from about 2 to about 30 mole percent cationic repeat units prior to reaction, wherein greater than about 5 mole percent of the acrylamide repeat units are converted to reactive aldehyde groups in the cationic polymeric resin; and wherein the composition exhibits a viscosity increase of less than about 200 percent.

The invention discloses a bismuth-containing material catalytic electrode as well as a preparation method and application thereof, and belongs to the technical field of electro-catalytic materials. The electrode comprises a carbon fiber substrate with a porous structure and a carbon-coated bismuth-based compound arranged on the substrate, and the electrode can be applied to electrocatalytic oxalic acid reduction reaction. Compared with the prior art, the carbon-coated bismuth-based compound loaded on the carbon fiber substrate has the advantages of high current density, high Faraday efficiency, good stability and the like in the process of preparing glyoxylic acid by electrocatalytic oxalic acid reduction, and also has relatively high reaction activity and selectivity.

The present invention relates to a process for the preparation of polyaminocarboxylic acids, in particular phenolic aryl- or alkyldiaminepolycarboxylic acids, preferably a compound of formula (I): wherein X is selected from the group consisting of: H, COOH, COO−Y+, OH, linear or branched C1-C5 alkyl, CH2OH, SO3H, SO3−Y+, wherein: —Y+ is independently selected from the group consisting of: Li+, Na+, K+, and NH4+; and wherein A is selected from: —A (CH2)n linear aliphatic system, wherein n=2, 3 or 4, preferably 2 or 3; and —an aromatic system of formula (II): wherein R1, R2 are independently selected from the group consisting of H, OH, and linear or branched C1-C5 alkyl; said process comprising the step of reacting, a phenol compound, glyoxylic acid and an aryl- or alkyldiamine in the presence of an iron source to obtain a reaction mixture comprising the compound of formula (I). The invention also relates to a process for the preparation of a chelate compound, which is a complex of the compound of formula (I) with iron.

The application discloses a preparation method and application of light-colored nanoparticle lignin, and the preparation method comprises the following steps: washing and grinding peeled red hemp stalks into powder, then adding the powder into a mixed aqueous solution of glyoxylic acid and p-toluenesulfonic acid to react, the concentration of the glyoxylic acid is 4-10 wt.%, the concentration of the p-toluenesulfonic acid is 50-80 wt.%, the reaction temperature is 70-100 DEG C, and the reaction time is 30-60 min; after the reaction is completed, solid-liquid separation is performed, the filtrate is precipitated by adding water, the lignin is dialyzed, and the lignin is freeze-dried to obtain red hemp light-colored lignin; the red hemp light-colored lignin is dissolved in a gamma-valerolactone solution, dialyzed by ultrapure water, and then freeze-dried to obtain light-colored nanoparticle lignin, the obtained lignin has low condensation degree, light color and good ultraviolet absorption performance.

Coating compositions comprising a phenolic resin and a film-forming resin having functional groups that are reactive with the functionality of the phenolic resin are disclosed herein. The phenolic resin comprises a phenol group containing compound and a glyoxylic acid containing compound. Such phenolic resins may be used as formaldehyde-free crosslinkers in coating compositions and such coating compositions may be used on substrates comprising a non-porous material, such as metal, glass, and / or plastic. Also disclosed are methods of coating a substrate and coated substrates, including food and / or beverage containers.