46 results about "Aqueous reaction" patented technology

The present invention relates to a process for the preparation of substituted 4-(N′-hydroxy-carbamimidoyl)benzoic acids, which can be obtained by nitrilase catalyzed hydration of substituted terephthalonitriles of formula (II) in an aqueous medium to afford (ammonium) 4-cyanobenzoic acids (IIa). The hydration is followed by treatment of the aqueous reaction medium with hydroxylamine or a salt thereof to afford amidoximes (I).

The invention discloses an antistatic and antibacterial mixed fiber and a preparation method thereof, and belongs to the technical field of textile fabrics. The preparation method comprises the steps of fiber pretreatment, polycaprolactam graft modification, polyethylene glycol terephthalate graft modification, blending treatment and after-treatment. According to the invention, the PA6 (polycaprolactam) fiber is grafted and modified step by step to load quaternary ammonium salt, so that the long-acting antibacterial effect is realized; pET (polyethylene glycol terephthalate) fiber is grafted with a cationic monomer to construct an antistatic path, and the PET fiber and the cationic monomer are blended in a ratio of (6-7): (3-4), so that the performance and the mechanical strength are considered; a polythiophene conducting layer and silver-doped nano titanium sol are adopted in after-treatment, so that the surface is endowed with double antibacterial and efficient antistatic functions. According to the process, the environmental protection property and the production efficiency are remarkably improved through a water-phase reaction system and a padding-baking method, and the function retention rate is larger than or equal to 90% after 50 times of washing.

The present application relates to the technical field of copper clad laminates, and discloses a copper clad laminate, a resin composition for the copper clad laminate, and spherical silicon and a preparation method therefor. The spherical silicon of the present application is composed of spherical silicon dioxide and zinc molybdate particles dispersedly grown on the surface of the spherical silicon dioxide in situ and has a diameter of less than 10 microns and a D50 of 0.6-6 microns. The content of zinc molybdate per unit area on the surface of the spherical silicon dioxide is 0.03-1 g / m2, and the size of the zinc molybdate particles is less than or equal to 400 nm. The preparation method comprises: enabling spherical silicon dioxide to come into contact with / be mixed with a soluble molybdate and a zinc salt in an aqueous reaction system; and reacting the soluble molybdate with the zinc salt in situ on the surface of the spherical silicon dioxide, so as to form spherical silicon chemically coated with zinc molybdate particles. In the present application, by directly synthesizing the zinc molybdate in situ on the surface of the spherical silicon dioxide by means of a hydrothermal method, the structural morphology of the obtained spherical silicon and the size of the zinc molybdate particles can be effectively controlled, thereby ensuring that the wear of a drill bit during the drilling of the copper clad laminate is effectively mitigated.

The invention relates to the technical field of preparation of high-purity inorganic nano materials, and discloses a controllable preparation method of a high-purity cadmium telluride nanocrystal, which comprises the following steps: pre-dissolving a conjugated acid salt in a water-phase reaction system, and reacting a cadmium salt precursor with a tellurium source precursor when ammonia gas is introduced as an inorganic gaseous ligand; a pH buffer system is constructed by ammonia gas and conjugated acid salt, and transient stability is provided for the generated cadmium telluride nanocrystals within the pH range for inhibiting the cadmium hydroxide impure phase; according to the method disclosed by the invention, an in-situ pH buffer system is constructed, so that a ligand stabilization function of the ammonia gas is decoupled from an alkaline side reaction phase of the ammonia gas, agglomeration is prevented while an impure phase is inhibited, the ligand and the salt are thoroughly removed after the reaction, and the technical problem that controllability and high purity cannot be obtained at the same time in an inorganic aqueous phase method is solved.

The present invention provides an ink set containing water-based ink and a reaction solution, which is less prone to clouding of the reaction solution due to heat and over time, and which can record images with good scratch resistance and water scratch resistance. [Solution] An ink set comprising an aqueous ink and a reaction solution used in an inkjet recording method for recording an image on a recording medium using an aqueous ink and an aqueous reaction solution containing a reactant that reacts with the aqueous ink. The aqueous ink contains a resin. The reactant contains at least one selected from the group consisting of polyvalent metal salts and cationic resins. The reaction solution further contains an ionic surfactant and a crosslinking agent that can form a bond with the resin in the aqueous ink.

Levulinic acid and formic acid are valuable chemical intermediaries present in byproducts of some biomass conversion processes. Described herein are commercially viable processes for extracting levulinic acid and formic acid at high recovery. Under the present approach, levulinic acid and formic acid may be extracted from an aqueous reactor product, such as an acidic brine (e.g., calcium chloride brine) feed from a biomass hydrolysis reaction. If present, mineral acid catalysts may be recovered. Embodiments use solvents such as, e.g., 2-methyl tetrahydrofuran, for extracting levulinic acid and formic acid from the aqueous solution.

Orthodontic articles and polymerizable resin compositions are described. The orthodontic article comprises a cured composition comprising the reaction product of free-radically polymerizable resin comprising 30 to 70 wt. %, inclusive, of at least one urethane component, and 25 to 70 wt. %, inclusive, of reactive diluent(s) comprising at least one monofunctional (meth)acrylate monomer. The polymerizable resin comprises no greater than 35 wt. % of reactive diluent(s) having a high affinity for water. Reactive diluent(s) such as monofunctional (meth)acrylate monomers having a high affinity for water have low log P values. In one embodiment, the polymerizable resin comprises at least one acidic monomer.

The invention discloses a phase interface controllable copper-based solid catalyst and a preparation method and application thereof, and belongs to the technical field of catalyst preparation and catalytic reaction engineering. According to the copper-based solid catalyst, metal salts are used as a copper source, a bismuth source and a manganese source, a bidentate complexing agent containing a C element is used as a guiding agent, the metal salts and the complexing agent are mixed and then self-assembled in advance in a solution to form a coordination complex, and then the coordination complex is dried and roasted to obtain the copper-based solid catalyst. The outer layer of the copper-based solid catalyst is a porous carbon shell layer with controllable hydrophilicity and hydrophobicity and thickness, and a copper center coordination site is coated and limited by a carbon layer; the outer layer of the active copper center of the copper-based solid catalyst is coated with a porous carbon shell layer with controllable gas-liquid-solid three-phase interface activity, so that hydration of a silicon-based carrier of an industrial catalyst in a water-phase reaction system can be overcome, and the stability of the catalyst is improved.

An ink jet recording method includes a step of providing a recording medium with an aqueous ink containing a pigment dispersed by an action of an anionic group, a resin particle and a wax particle and an aqueous reaction liquid containing a reaction agent that reacts with the aqueous ink and a step of heating the recording medium provided with the aqueous ink and the aqueous reaction liquid. A heating temperature, a glass transition temperature of the resin particle and a melting point of the wax particle satisfy a predetermined relationship, average particle diameters of the pigment and the wax particle satisfy a predetermined relationship and anionic groups of the pigment, the resin particle and the wax particle satisfy a predetermined relationship.

The present invention relates to a method of making a fluoroelastomer [fluoroelastomer A] in an aqueous reaction medium free of fluorinated surfactants, said method comprising: a: forming a mixture comprising: i) water, ii) one or more fluorinated solvents having less than 0.1 mmol of ionic functionality / kg of solvent, and i) one or more fluorinated solvents having less than 0.1 mmol of ionic functionality / kg of solvent; the present invention relates to a composition comprising: i) one or more fluoroalkyl vinyl ethers (PAVEs) and preferably free of ionic functional groups, iii) a radical initiator, iv) monomers comprising tetrafluoroethylene (TFE) and one or more perfluoroalkyl vinyl ethers (PAVEs), v) optionally one or more chain transfer agents; b: initiating polymerization of said monomers, thereby forming a fluoroelastomer as a stable latex [fluoroelastomer A] wherein:-said mixture is free of fluorinated surfactants-the weight ratio between said fluorinated solvent or solvents and said water is from 0.1 to 10; -said fluoroelastomer A comprising from 30% to 85% by mole of recurring units derived from tetrafluoroethylene and from 5% to 50% by mole of recurring units derived from one or more PAVEs.

The invention relates to a method for carrying out redox reactions with a three-phase electrode, having two separate phases, comprising an organic phase containing an amphiphilic organic reactant and / or an electrochemically inert organic solvent and an aqueous phase containing a hydrophilic reactant and / or an aqueous solvent with a hydrophilic reactant, wherein the organic and the aqueous phase are separated from one another by a permeable membrane.

This invention relates to an inkjet recording method, an inkjet recording apparatus, and a kit of aqueous ink and aqueous reactive solution. An inkjet recording method is provided that records images on a recording medium using an aqueous ink and an aqueous reactive solution containing a reactant that reacts with the aqueous ink. The aqueous ink comprises pigments dispersed by carboxylic acid groups, resin particles, and a water-soluble organic solvent. The pigments dispersed by carboxylic acid groups exhibit a particle size increase of more than 8.0 times upon contact with the aqueous reactive solution. In the Bristow method, from the start of contact to 30 msec... 1 / 2 The amount of water absorbed by the recording medium is 10 mL / m 2 the following.

Disclosed is method for on-site glyoxylation of polyacrylamide in a paper or board mill, where a discontinuous batch glyoxylation reaction of aqueous reaction mixture is performed in reactor vessel having driven agitator to form aqueous polymer composition comprising glyoxylated polyacrylamide. The method comprises forming or obtaining the aqueous reaction mixture comprising polyacrylamide base polymer and glyoxal, determining alkali consumption of the mixture, and adding to the mixture, based on determined alkali consumption, pre-determined amount of alkali for adjusting pH to 8-10. The temperature is optionally adjusted to 15-40° C. and the on-site glyoxylation reaction of polyacrylamide base polymer is allowed to proceed. Viscosity of the mixture and / or a variable related to the viscosity is measured, acid is added to the mixture for lowering pH to <8, when a predetermined end viscosity value is attained, and the aqueous polymer composition comprising glyoxylated polyacrylamide is removed from the reaction vessel.

To provide a method for producing ink jet-recorded materials that enables production of high-quality recorded materials with narrowly and uniformly aligned cut widths when cutting a resin film-containing recording medium on which an image is recorded by an ink jet system by a laser die cutting method.SOLUTION: A method for producing an ink jet-recorded material having a step of applying an aqueous reaction liquid to a resin film-containing recording medium, a step of applying an aqueous ink by an ink jet system so as to overlap at least a portion of a region of the recording medium to which the reaction liquid has been applied, thereby recording an image, and a step of irradiating a region to which the reaction liquid and the aqueous ink have been applied with laser light to cut the recording medium, wherein the reaction liquid contains an inorganic metal salt and the aqueous ink contains titanium oxide.SELECTED DRAWING: None

The invention relates to a method for producing a polymer dispersion, to a polymer dispersion and to the use thereof. The method for preparing a water-in-water polymer dispersion utilizes a batch reactor that provides a specific shear distribution wherein the method comprises the step of free radical polymerization of an aqueous reaction mixture to synthesize a dispersed polymer and form a water-in-water polymer dispersion, the aqueous reaction mixture comprises (a) a polymeric dispersant and (b) a monomer composition comprising a radically polymerizable monomer, wherein the radically polymerizable monomer is selected from one or more of a nonionic ethylenically unsaturated monomer, a cationic ethylenically unsaturated monomer, and an amphiphilic ethylenically unsaturated monomer.

The invention relates to a method for manufacturing low molecular weight polytetrafluoroethylene (PTFE) powders having high BET specific surface area, in an aqueous reaction medium comprising: • in a reactor pressurized at a pressure P of from 4 to 30 bar and a temperature T of from 10°C to 100°C forming an aqueous mixture comprising • (i) one or more radical initiator, • (ii) one or more chain transfer agent, • (iii) tetrafluoroethylene (TEE) monomers and • (iv) one or more acid functionalized monomer or salt thereof, thereby forming a polymer from said monomers, wherein said polymer is in powder form • wherein said polymer comprises at least 95% by weight of recurring units derived from TFE and at least 99% by weight of recurring units derived from perhalogenated monomers, and to the thus obtained low molecular weight PTFE powders.

Provided is a reaction liquid for ink jet, which can record a high-quality image and is excellent in intermittent ejection stability, to be used together with an aqueous ink. The reaction liquid for ink jet is used in an ink jet recording method including recording an image on a recording medium with an aqueous ink and an aqueous reaction liquid containing a reactant that reacts with the aqueous ink. The reaction liquid includes a polyvalent metal salt and a surfactant. The surfactant is a compound including a hydrophilic moiety having an anionic group and a hydrophobic moiety that is an aliphatic hydrocarbon group. A mass ratio of a content (% by mass) of the polyvalent metal salt in the reaction liquid to a content (% by mass) of the surfactant therein is 10.0 times or more to 35.0 times or less.

The present invention relates to a water-efficient method of storing hydrogen using a bicarbonate / formate-based aqueous reaction system, wherein the method comprises: (A) reducing aqueous bicarbonate using hydrogen to form formate and water, (B) at least partially separating water from the aqueous reaction system to provide water and concentrated salt components comprising formate, and (C) using the water provided in step (B) to form hydrogen for use in step (A) and / or to dissolve concentrated salt components comprising bicarbonate to provide aqueous bicarbonate for use in step (A).

The present invention relates to a process for the preparation of silicates, preferably alkali silicates, from spent foundry sand using a hydrothermal route, comprising the step of reacting said spent foundry sand with a base, preferably an alkali hydroxide, in an aqueous reaction medium, wherein the process does not comprise any thermal pre-treatment step as applied in prior art processes. The present invention also relates to a process for the preparation of precipitated silica using said silicates.

The present invention relates to a method for producing a support at least micrometric in size, photocatalytically active and at least in the visible range, containing nanocrystals each composed of from 80 to 100 mol % of TiO2 and from 0 to 20 mol % of at least one other metal or semi-metallic oxide, comprising the following steps, from an acidic aqueous reaction medium, at a heating temperature of between 20 and 60° C.: a step of adding the titanium oxide precursor, or a mixture of the titanium oxide precursor and the precursor of the other oxide, in the acidic aqueous reaction medium, and a condensation step on or inside the support, by spraying onto the support or immersing the support in the aqueous reaction medium, for a specific period of condensation, a heating step, the support allowing the nanocrystals to be crystallized, without using surfactant, in the aqueous reaction medium, a step of rinsing with water and a recovery step on the one hand of the support on which the crystallization took place, these nanocrystals being attached by covalent bonds to the support, and on the other hand of a residual solution.

The invention relates to a process for in-situ glyoxylation of polyacrylamide in paper mills, board mills and the like, wherein a discontinuous batch glyoxylation reaction of an aqueous reaction mixture is performed in a reactor vessel equipped with a drive stirrer to form an aqueous polymer composition comprising glyoxylated polyacrylamide. The process comprises forming or obtaining an aqueous reaction mixture having a starting viscosity and comprising a polyacrylamide base polymer having a weight average molecular weight of 30000 - 300000 g / mol and glyoxal. The concentration of the polyacrylamide base polymer in the reaction mixture is 1.5% - 8% higher than the critical concentration of the polyacrylamide base polymer. A base feed is added to the reaction mixture while measuring the viscosity of the reaction mixture and / or a process variable related to the viscosity of the reaction mixture and allowing the in-situ glyoxylation reaction of the polyacrylamide base polymer in the reaction mixture to proceed. When a predetermined final viscosity value is reached, the base feed is terminated and an acid is added to the reaction mixture. The aqueous polymer composition comprising glyoxylated polyacrylamide is removed from the reaction vessel.

The present invention relates to a batch reactor comprising an aqueous reaction mixture for the preparation of a water-in-water polymer dispersion by free radical polymerization wherein the batch reactor comprises a stirrer treated by a grinding and polishing technique or wherein the batch reactor is free of baffles. Furthermore, the invention relates to a method for producing a water-in-water polymer dispersion by free-radical polymerization in said batch reactor. Furthermore, the invention relates to the use of said batch reactor in a method for producing a water-in-water polymer dispersion.

The invention relates to a three-phase electrode and a method for carrying out redox reactions with this three-phase electrode, comprising two separate phases, comprising an organic phase containing an amphiphilic, organic reactant and / or an electrochemically inert organic solvent and an aqueous phase containing a hydrophilic reactant and / or an aqueous solvent with a hydrophilic reactant, wherein the organic and the aqueous phase are separated from each other by a permeable membrane.

The invention discloses a non-aqueous reaction type bi-component polyurethane grouting material as well as a preparation method and application thereof. The non-aqueous reaction type bi-component polyurethane grouting material comprises a component (a) and a component (b), the component (a) comprises the following raw materials: first polyether polyol, second polyether polyol, a first plasticizer, a composite catalyst and nano silicon dioxide; the component (b) is prepared from the following raw materials: polymethylene polyphenyl polyisocyanate, polyether polyol modified isocyanate, a second plasticizer, aromatic hydrocarbon oil and nano calcium carbonate; wherein the difference value of the hydroxyl value and the difference value of the molecular weight of the second polyether polyol and the first polyether polyol are controlled, and the composite catalyst is composed of triethylene diamine, dibutyltin dilaurate and zinc octoate; practice shows that the mechanical strength is remarkably improved while good constructability and flexibility of a polyurethane material are maintained, breakthrough balance of comprehensive performance is achieved, and an ideal novel grouting material solution is provided for the field of structural reinforcement.

The present invention covers and / or separates one or more aqueous reaction mixtures in a reaction vessel using a gel layer. The gel layer can protect a reagent or a reaction product from being in contact with the atmosphere. The gel layer may also separate a plurality of aqueous reaction mixtures such that they do not contact each other before the gel layer breaks. The oil layer can be directly inserted under the gel layer. By inserting the tip of the micropipettor, a solution (such as a sample) can be delivered below the gel layer through the gel layer. A micropipette tip or inert rod may also be used to break the gel layer resulting in mixing of the aqueous reaction mixture above and below the layer. The gel layer may also be ruptured by selectively applying heat or moving the magnetic beads. A plurality of gel layers separating a plurality of aqueous reagent mixtures may be ruptured in a prescribed order to perform a series of ordered biological treatment steps.

A one-step method for synthesizing amoxicillin from penicillin or a salt thereof through an enzyme catalysis is provided. Conventional amoxicillin production requires sequential use of distinct penicillin acylases for hydrolysis and synthesis steps, necessitating isolation of the intermediate 6-aminopenicillanic acid (6-APA) and resulting in elevated manufacturing costs and suboptimal process efficiency. To address these limitations, the inventive method utilizes a mutant of penicillin acylase derived from Kluyvera citrophila as the exclusive biocatalyst in an aqueous reaction system. By reacting penicillin G potassium salt with D-p-hydroxyphenylglycine methyl ester, the process achieves direct amoxicillin synthesis in a single enzymatic step, attaining a product yield of 99%. This method exhibits advantages including fast catalytic rate, high product yield, environmentally friendly pure aqueous reaction system, low cost, and excellent economic benefits.

The present application relates to a kind of cyclic solid-phase reaction column systems based on induction heating and its operating method.The system includes reaction column, liquid inlet pipeline, liquid outlet pipeline, circulation pipeline and diaphragm pump or plunger pump or plunger pump and valve arranged in each pipeline, reaction column is filled with solid beads or particles inside, copper induction coil is arranged on its outside, and is electrically connected with induction heating module.Circulation diaphragm pump or plunger pump or plunger pump is started under the condition that liquid inlet valve and liquid outlet valve are closed, to make aqueous solution form closed circulation in reaction column, utilize induction heating module to heat reaction column, realize the uniform circulation and heating of solution in reaction column.It can complete cleaning, reaction and product collection operation in the same reaction column, diaphragm pump or plunger pump can form fluid block in stop working state, with the function of pump and valve.The present application is simple in structure, high in heating efficiency, flexible in operation, and suitable for various solid-phase and aqueous reaction process.

The invention relates to a paper-based sensor, a preparation method of the paper-based sensor and application of the paper-based sensor in detection of alternariol, and belongs to the technical field of food detection. The paper-based sensor comprises a first protective layer, an immobilization layer, a substrate layer, a color development layer and a second protective layer, the surfaces of the first protective layer and the second protective layer are coated with hydrophobic materials; central areas of the immobilization layer, the substrate layer and the color development layer are coated with acetylcholin esterase, acetylthiocholine and nano-enzyme respectively to form hydrophilic reaction areas, and non-hydrophilic reaction areas are coated with hydrophobic materials to form hydrophobic isolation areas; the first protection layer, the immobilization layer, the substrate layer, the color development layer and the second protection layer are folded according to a preset sequence, and the hydrophilic reaction areas of the immobilization layer, the substrate layer and the color development layer are mutually overlapped after folding. The paper-based sensor is remarkably improved in the aspects of detection sensitivity, stability and convenience.