1332 results about "Chemical conversion" patented technology

A method and device for the chemical conversion, filtration and/or purification of fluids water or other solutions containing microbiological and chemical contaminants, such as fluids containing arsenic, chlorine, bacteria, viruses, and cysts, where the fluid is passed through a purification material composed of fluid treatment carbon, metal phosphates, metal oxides, reduced metals, metal silicates, metal sulfates, metal carbonates, metal hydroxides, or combinations thereof. The material may be included in a fixed binder matrix.

An electrical apparatus includes a reaction chamber. A stream of contaminated gasses flows through the chamber. An elongated coronating electrode is positioned in the reaction chamber for producing a corona discharge within the chamber. A multi-stage Fitch generator connected to the electrode produces a high level, rapidly pulsating voltage in the electrode. Controlled amounts of an inert gas or inert gas-air mixture are combined with the contaminated gases to provide a high concentration of inert gas in the reaction chamber. In the inert gas-enriched atmosphere, the pulsating corona discharge produces a high concentration of metastable intermediates that greatly increase the rate of chemical conversion of the contaminants. Switching circuitry allows the pulsating voltage output of the Fitch generator to be superimposed on a constant direct current voltage in the electrode, setting up an electrostatic field in the reaction chamber for removing conversion byproducts from the gas stream.

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 relates to a metal surface treating agent which comprises the following components: silicate or metasilicate, chitosan, corrosion inhibitor, surfactant, antioxidant, wetting agent, film-forming additive, ethanol and water, wherein one or more of nanosized titanium dioxide, zirconium oxide or zirconium fluoride are evenly mixed with silicate or metasilicate and account for 3wt%-25wt% of silicate or metasilicate; the particle size of nanosized titanium dioxide, zirconium oxide or zirconium fluoride is less than 100nm; the degree of deacetylation of chitosan is 55%-100%; and the pH value of the composite is adjusted to 5.0-9.0. The invention provides the metal surface treating agent which uses environmentally friendly aqueous solution to form a metal chemical conversion film so as to inhibit the surface corrosion of metal; when the metal surface treating agent is used to treat the surface of the cold-rolled steel plate product, the rust-proof effect is especially good; and the metal surface treating agent can not cause environmental pollution and be green and environmentally friendly.

The invention provides a metal surface treatment agent composed of aqueous solution or aqueous emulsion containing ionic liquid. The metal surface treatment agent comprises the ionic liquid, silicate or silane coupling agent, water-soluble chitin or chitosan, corrosion inhibitor, stabilizer, pH modifier, wetter, coalescing agent, antioxidant, ethanol and water, the ionic liquid is room-temperature ionic liquid consisting of nitrogenous heterocyclic compound cations and inorganic or organic anions, one or more of nanoscale titanium dioxide, zirconium oxide or zirconium fluoride is uniformly mixed into the silicate or silane coupling agent by the weight equivalently accounting for 3%-25% of that of the silicate or silane coupling agent. A chemical conversion coating is formed on a metal surface by the metal surface treatment agent, can inhibit corrosion of the metal surface, and has a fine coating performance. The metal surface treatment agent is used for treating cold-rolled plates, galvanized plates and aluminum plates, and the metal surface treated by the metal surface treatment agent has the coating adhesion force equivalent to that of a metal surface treated by a phosphorus-containing metal surface treatment agent.

A gel film or an isolated gel film comprising sheets of graphene or chemically converted graphene at least partially separated by a dispersion medium, such as water, and arranged in a substantially planar manner to form an electrically conductive matrix.

The invention relates to the field of aluminum alloy decoration and protection coating for ships, in particular relates to an environmentally-friendly corrosion-contamination resistant chemical conversion agent and application thereof in a chromium-free chemical conversion film, and solves the problems of poor corrosion resistance, high cost, difficulty in large-area construction and the like in the prior art. The chemical conversion agent comprises a component A and a component B. The method for preparing a chemical conversion film comprises the following steps of: forming a first inorganic chemical conversion film layer by the component A and forming an organic contamination resistant closed film by the component B. The component A is a water solution prepared from a main salt, a film-forming accelerator, a buffering agent, a surfactant and the like, and the component B is prepared from silicate, silane, a silica sol, titanate, zirconate, waterborne resins and the like. The chemicalconversion agent does not contain chromium ions and phosphates, and the chromium-free chemical conversion film prepared from the chemical conversion agent has excellent corrosion resistance and contamination resistance, can be used for construction of large-area aluminum alloy sections, and can be used as surface decoration and protection coatings for 5xxx and 6xxx series aluminum alloys.

A chemically transferred non-chromium Mg-alloy film is prepared through grinding said Mg-alloy, removing impurities, washing with alkali solution for defatting, washing with acidic solution for removing surfacial oxide, removing very thin oxidized film and pickling ash from its surface by fluoric acidic solution, immersing the Mg-alloy in filming solution to obtain phosphate film, and immersing in alkaline aqueous solution at 15-100 deg.C for 3-60 min for closing the pores in the film. Said filming solution is prepared from Mn salt, phosphate, fluoride and water.

An ionic liquid according to the invention is substantially halogen-free, has a low viscosity and is stable to hydrolytic degradation under test conditions. The ionic liquid is a compound of the formula (cation) (R′—O—SO₃), (cation) (R′—SO₃), or a mixture of the two compounds. It can be used in processes for the chemical conversion and separation of materials by employing the ionic liquid as a solvent, solvent additive, extraction agent or phase-transfer catalyst. It can also be used in a heat exchange device wherein the ionic liquid serves as a heat carrier or heat carrier additive.

The invention discloses a transforming solution for preparing anti-corrosion compound oxidation film on an aluminum alloy surface and a using method for the oxidation film. The invention is characterized in that, the transforming solution is a film-forming promoter containing rare-earth salt (nitrate or sulfate and compound salt of cerium, praseodymium, and neodymium), such compound oxidant as radical of permanganate, nitrate and perchlorate, etc., film-forming promoter of vanadium salt and strontium salt, etc.; the transforming solution contains no sexavalent chromium, is environmental friendly; the reaction speed is improved by the compound oxidant and the film-forming promoter, no heating is needed for the chemical transforming, the treating time is 1-5 min. The invention can rapidly prepare under room temperature compound oxidation film comprising compound rare-earth oxide, alumina and manganese oxide with good resistance to corrosion on aluminum alloy surface. The treating solution from the invention is of rapid film-forming speed, simple process, even film layer, high resistance to corrosion, and low environmental pollution, etc.

Protective caps residing at an interface between metal lines and dielectric diffusion barrier (or etch stop) layers are used to improve electromigration performance of interconnects. Protective caps are formed by depositing a first layer of aluminum-containing material over an exposed copper line by treating an oxide-free copper surface with an organoaluminum compound in an absence of plasma at a substrate temperature of at least about 350° C. The formed aluminum-containing layer is passivated either partially or completely in a chemical conversion which forms Al—N, Al—O or both Al—O and Al—N bonds in the layer. Passivation is performed in some embodiments by contacting the substrate having an exposed first layer with an oxygen-containing reactant and/or nitrogen-containing reactant in the absence of plasma. Protective caps can be formed on substrates comprising exposed ULK dielectric. The aluminum-containing layer residing on the dielectric portion will typically spontaneously form non-conductive layer comprising Al—O bonds.

Improved apparatus for use in process systems which include exothermic chemical conversions of organic compounds to value added products is disclosed, more particularly, flow reactors for exothermic chemical conversions using a fixed heterogeneous catalyst with means for control of the exotherm. Flow reactors of the invention comprise a plurality of walled conduits each having an outer surface disposed for contact with a heat-transfer medium, an inlet distribution manifold adapted for flow communication with a downstream manifold through channels formed by heterogeneous catalytic material disposed within each conduit during operation in a sequence of zones for catalyst having the same or different length along the longitudinal coordinate of the conduit and within each zone essentially uniform cross-section of the conduit measured in a plane perpendicular to the longitudinal coordinate thereby defining volume of the zone, and the sequence of zones comprising of at least two zones such that each downstream zone has a larger or smaller cross-section than the contiguous upstream zone. Another aspect of the invention includes processes which use such flow reactors, for example the continuous manufacture of maleic anhydride.

The invention relates to the technical field of biomaterial, is particularly applicable to the field of surface modification of a biological medical material, in particular to a biological activity surface modification method for a biological medical degradable magnesium alloy. The method is to prepare a surface coating on magnesium or a magnesium alloy, and comprises the following steps that: anintermediate chemical conversion film is prepared on the surface of the magnesium or the magnesium alloy; and then a ceramic layer with biological activity is prepared on the outer layer. The surfacecoating not only can control the degradation speed of a matrix of the magnesium or the magnesium alloy, but also has surface activity. The surface coating comprises the intermediate chemical conversion film and the outer biological activity ceramic layer, wherein the intermediate chemical conversion film not only can control the degradation speed of the matrix of the magnesium matrix, but also can improve the preparation performance and bonding force with the matrix of the outer biological activity ceramic layer; and the outer biological activity ceramic layer improves the biological activityof an implanting body, and enhances bonding strength of the implanting body and an organism so as to improve the success ratio of implantation. The invention aims to solve the problems of fast degradation and low surface biological activity of a degradable biological medical magnesium alloy.

The invention provides a catalyst preparation method. The procedure is that:1} a solution containing soluble compounds with loaded components is prepared; 2} the solution produced in procedure 1 is sprayed on a rolling carrier or a carrier preloading one or a plurality of components and the carrier is heated in the process of spraying; 3) the product produced in procedure 2 is dried or roasted; 4) the procedures 2 and 3 are repeated. The active components of the catalyst prepared in the method of the invention contain group eight elements. When the catalyst preparation method of the invention is applied in the hydrocarbon preparation procedure from mixed gas of carbon monoxide and hydrogen, the active components of the catalyst prepared contain group eight elements. The invention provides a better shell catalyst preparation technique, which solve the problem of internal diffusion in certain chemical conversion procedures. The catalyst can be applied in hydrocarbon preparation reaction of gas mixture of carbon monoxide and hydrogen.

The present invention provides methods and compositions for the chemical conversion of syngas to alcohols. The invention includes catalyst compositions, methods of making the catalysts, and methods of using the catalysts including techniques to maintain catalyst stability. Certain embodiments teach compositions for catalyzing the conversion of syngas into products comprising at least one C₁-C₄ alcohol, such as ethanol. These compositions generally include cobalt, molybdenum, and sulfur, and avoid metal carbides both initially and during reactor operation.

It is an object of the present invention to provide a method of metal surface treatment and a surface treated metal thereby, which has excellent corrosion resistance and can form a coat having high corrosion resistance on metal substrates such as iron, zinc, aluminum and magnesium. A method of metal surface treatment comprising the step of forming a chemical conversion coat on the surface of a metal article to be treated by a chemical conversion treatment reaction by a chemical conversion treatment agent containing a zirconium-containing compound and a fluorine-containing compound, wherein said chemical conversion treatment reaction is conducted through cathodic electrolysis treatment.

Perfluorinated polyimides (and co-polyimide) compositions, particularly films are disclosed, comprising at least 50 mole percent of a polymeric repeat unit derived from contacting 3,3′,4,4′-biphenyltetracarboxylic dianhydride (BDPA) and 2,2′-bis(trifluoromethyl) benzidine (TFMB) monomers. The perfluorinated polyimide (and co-polyimide) films of the invention have an in-plane coefficient of thermal expansion (CTE) between −5 and +20 ppm/° C. and a average light transmittance percent of from about 65.0 to about 99.0 (on a 75-micron thick film basis). The films of the present invention were converted to a polyimide using a chemical conversion method instead of typically employed thermal conversion step thus yielding these desirable properties. The films of the present invention can be an excellent substrate in an optical display device and can be used to replace rigid glass substrates. Finally, the polyimide films of the invention can also be used to manufacture flexible display devices (e.g., cellular phones, personal digital assistants, portable video games, laptops, and the like).

The invention relates to an environmentally-friendly magnesium alloy chemical conversion film, microarc oxide film hole sealing solution and a hole sealing method. The hole sealing solution comprises phytate or phytic acid and one or more following substances of alkali metal hydroxide, silicate, phosphoric acid or phosphate. The hole sealing method is operated according to the following steps: preliminary treatment; chemical conversion or micro-arc oxidation; post treatment: in phytate, one of or several kinds of silicate, phosphoric acid or phosphate are added, the pH value of solution is adjusted by the alkali metal hydroxide or ammonia water, solution temperature is controlled at 30-100 DEG C, and hole sealing treatment is carried out. The hole sealing solution used by the invention does not contain Cr6 and F-, thus causing no pollution to environment. After sealing holes, the size of the crack or the micropore of the chemical conversion film or oxide film is obviously decreased, and corrosion resisting property is improved; meanwhile, the film layer and the organic coating obtained by next-step painting have favourable adhesive force.

The invention relates to the field of aluminum alloy decoration and protection coatings for ships, in particular to an aluminum alloy scratch resistant and fingerprint resistant chromium-free chemical conversion solution for a ship and application of the aluminum alloy scratch resistant and fingerprint resistant chromium-free chemical conversion solution to a chemical conversion film. The chemical conversion solution contains titanium salts, zirconium salts, a silicon compound, an accelerator, a surfactant and the balance water, wherein the concentration of the titanium salts in the chromium-free chemical conversion solution ranges from 0.02 to 10g/L; the concentration of the zirconium salts in the chromium-free chemical conversion solution ranges from 0.1-10 g/L; the concentration of thesilicon compound in the chromium-free chemical conversion solution ranges from 2 to 25g/L; the concentration of the accelerator in the chromium-free chemical conversion solution ranges from 0.5-12 g/L; and the concentration of the surfactant in the chemical conversion solution ranges 0.1 to 10g/L. Chemical conversion films are formed on the surfaces of 5xxx or 6xxx series aluminum alloys by adopting an impregnating, brush coating, roller coating or spraying mode; and the chemical conversion films have favorable corrosion resistance, scratch resistance and fingerprint resistance and can be used as the surface decoration and protection coating of the aluminum alloy for the ship.

The invention provides a method for preparing phenolic chemicals through the thermo-chemical conversion of industrial lignin. The method is as follows: under the common functions of solid acid catalyst and hydrogen supply solvent, industrial lignin performs atmospheric thermo-chemical conversion in high boiling point organic reaction medium to prepare homogeneous low molecular weight organic matter with rich phenolic compounds such as phenol, methoxyphenol, dimethoxyphenol and 2-methoxy-4-methylphenol, and the organic reaction medium is recycled through the technologies such as vacuum distillation. The method has simple process, good stability and low production cost; and the yield of the prepared phenolic compounds is more than 54%. The method plays an important role in the high-valued comprehensive utilization of the renewable resource, namely ndustrial lignin; and the converted phenolic chemicals can be used to synthesize phenolic resin, prepare high efficiency cement water-reducing agent and further separate, purify and prepare bio-chemicals. Particularly, by adopting the method, the lignin in papermaking black liquid and preparation residue of biological fuel ethanol prepared from cellulose can be converted to phenolic chemicals; and the method has wide application prospect.

The invention provides a synthesis method of a phytic acid polymer and an application of the phytic acid polymer in the field of metal surface treatment. The preparation method specifically comprises steps as follows: phytic acid is dissolved in water and prepared to form a phytic acid solution; a silane coupling agent is dissolved in an organic solvent, the phytic acid solution is heated to 55-85 DEG C, the organic solvent solution containing the silane coupling agent is dropwise added to the phytic acid solution while the phytic acid solution is stirred, a thermostatic reaction is performed, and the slight white phytic acid polymer solution is obtained. When the phytic acid polymer solution is applied to metal surface pretreatment, a phytic acid polymer chemical conversion coating can be formed on a metal surface, and the defect of poor corrosion resistance of a film formed merely through phytic acid can be effectively overcome.