27 results about "Alkaline earth oxides" patented technology

This invention belongs to the field of pharmaceutical chemical synthesis technology, specifically relating to a method for preparing dicyandiamide by urea pyrolysis with anti-scaling properties. The method includes a reaction process using urea, alkaline earth metal oxides, and a scale inhibitor dopant as raw materials. The scale inhibitor dopant includes at least one of silicon dioxide and titanium dioxide, and its weight accounts for 0.1% to 5% of the weight of the alkaline earth metal oxides. Experiments show that introducing a scale inhibitor dopant into the reaction system can alter the surface tension of the isocyanate melt, helping to improve the surface properties and rheological state of the intermediate melt. This reduces material adhesion and aggregation on the reactor wall, lowers the risk of scaling and clogging, and may even eliminate scale buildup on the reactor wall, thereby improving the stability of continuous production.

To provide a composition containing a novel ingredient that can bring about at least an acceptable level of sebum control in keratinous substances such as skin. [Solution] The present invention relates to a composition comprising (a) (i) at least one inorganic oxide, preferably a metal oxide, more preferably an alkaline earth metal oxide, and (ii) at least one fatty acid or a salt thereof, preferably a saturated fatty acid or a salt thereof, more preferably a metal salt of a saturated fatty acid, and (b) at least one second powder selected from particles containing silica and hydroxyapatite. The composition according to the present invention can provide at least an acceptable level of sebum control to keratinous substances such as skin.

This application discloses a method for producing acetonitrile by amination of acetate, comprising the following steps: in a reactor, acetate, ammonia, and a catalyst are contacted and reacted to obtain acetonitrile; wherein the acetate is selected from at least one of methyl acetate, ethyl acetate, propyl acetate, butyl acetate, and cyclohexyl acetate; the catalyst is composed of a support and alkaline earth metal oxides and alkali metal oxides supported on the surface of the support; wherein the support is selected from at least one of silicon oxide, aluminum oxide, titanium oxide, and zirconium oxide; wherein the alkaline earth metal oxide is selected from at least one of magnesium oxide, calcium oxide, strontium oxide, and barium oxide; wherein the alkali metal oxide is selected from at least one of lithium oxide, sodium oxide, and potassium oxide; wherein the loading of alkaline earth metal oxide in the catalyst is 0.01–10 wt%, the loading of alkali metal oxide is 0.05–5 wt%, and the remainder is the support.

A variety of methods, systems, and compositions are disclosed, including, in one embodiment, a cement composition comprising an alkaline earth metal oxide, a soluble salt, a water-proofing agent comprising a divalent cation carbonate coated with fatty acid, and water. In other embodiments, the cement composition is introduced and allowed to set in a subterranean formation.

A co-electrolysis system according to one embodiment of the present invention may comprise: a mixed gas supplier for supplying a mixed gas containing carbon dioxide and water vapor; a co-electrolysis device for co-electrolyzing the mixed gas to generate a synthetic gas containing carbon monoxide and hydrogen; a carbonator for mixing an alkaline earth metal oxide-containing material with the synthetic gas and carbonating the alkaline earth metal oxide-containing material and carbon dioxide to obtain a carbonate; and a calciner for calcining the carbonate to regenerate the carbonate into an alkaline earth metal oxide-containing material.

A firing support for a ceramic powder of alkali and / or alkali-earth oxide comprising a porous ceramic body for containing said powder, said body comprising a ceramic material consisting of ceramic grains linked by a matrix; said matrix representing by mass between 5% and 50% of said material and comprising a crystalline nitride phase of chemical formula MsAltOuNv, where M is a chemical element selected from Si, Mg, Li, Zr, and s, t, u and v are stoichiometric indices between 0 and 1 and normalized with respect to the highest, and where s+t > 0, and u ≥0, and v> 0; said grains of equivalent diameter greater than 150 micrometers and less than 300 micrometers representing by volume at least 10% of said material; said body having an open porosity of between 5 and 40%, and a median equivalent pore diameter of between 0.1 and 15 micrometers. No figure

The purpose of the present invention is to provide an exhaust gas purification catalyst composition which has improved heat resistance. In order to achieve this purpose, the present invention provides an exhaust gas purification catalyst composition which contains a composite that contains a Zr-based oxide, an Al oxide that is present independently of the Zr-based oxide, an alkaline earth metal oxide that is present independently of the Zr-based oxide, and a platinum group element, wherein: the content of Al in the composite in terms of oxide is 1% by mass to 15% by mass inclusive based on the mass of the composite; the content of the alkaline earth metal element in the composite in terms of oxide is 0.1% by mass to 7% by mass inclusive based on the mass of the composite; and the X-ray diffraction pattern of the exhaust gas purification catalyst composition after a heat treatment satisfies formula (1) 1 ≤ IA / IB (wherein IA represents the integrated intensity of a peak located at 2θ = 27.0°-29.0° and IB represents the integrated intensity of a peak located at 2θ = 29.0°-30.8°).

The present application relates to the technical field of carbon dioxide removal from flue gas, and is a method and device for removing carbon dioxide from flue gas by supergravity mineralization, the former comprising: preparing a calcium-containing mineralization solution; reacting the calcium-containing mineralization solution with flue gas containing CO2 to remove CO2 from the flue gas, obtaining a suspension containing calcium carbonate and purified gas; and separating and filtering the suspension containing calcium carbonate to obtain superfine calcium carbonate; and the latter comprising a solid-liquid separator, a supergravity mineralization reactor, a liquid-solid separator, a filter and a heat exchanger. The present application uses an efficient reaction device to make CO2 in flue gas react with raw materials containing alkaline or alkaline earth metal oxides to generate carbonates, thereby being solidified and sealed for use, without the need for a capture and purification process, directly converting CO2 in flue gas into green carbon sequestration calcium carbonate, which can achieve efficient separation of carbon dioxide from flue gas in power plants, and can also achieve resource recycling and efficient utilization of CO2 and carbon, achieving the goal of emission reduction.

The application discloses a dehydrogenation catalyst and a precursor, a preparation method and application thereof. The dehydrogenation catalyst precursor is obtained through the following steps: mixing an aqueous solution of a precipitant and an aqueous solution of a metal salt to perform a precipitation reaction; and then performing post-treatment. The aqueous solution of the metal salt comprises a copper salt and a carrier alkaline earth metal salt. The temperature of the precipitation reaction is 30-90 DEG C. The end point pH value of the precipitation reaction is 6.0-10.0. The dehydrogenation catalyst precursor comprises an active component precursor and a carrier. The active component precursor is copper oxide. The carrier is one or more of alkaline earth metal oxides. The content of the copper oxide is 10%-75%. The content of the carrier is 5%-51%. The NH3 adsorption amount of the dehydrogenation catalyst precursor is less than 90 umol / g. The dehydrogenation catalyst obtained by reducing the dehydrogenation catalyst precursor is applied to a dehydrogenation reaction for preparing methyl isobutyl ketone. The temperature of the dehydrogenation reaction is 200-300 DEG C. The pressure of the dehydrogenation reaction is 0-0.5 MPa, and the dehydrogenation catalyst has high conversion rate and selectivity.

This invention belongs to the field of pharmaceutical chemical synthesis technology, specifically relating to a method for preparing high-yield dicyandiamide by urea pyrolysis. The method includes a reaction process using urea and alkaline earth metal oxides as raw materials in a sealed environment, wherein the reaction pressure is 0.1 to 0.3 MPa. Experiments show that by maintaining a positive pressure environment of 0.1 to 0.3 MPa in a dynamically sealed continuous rotary kiln, the volatilization loss of isocyanate (HNCO) is suppressed from a physical process perspective. This reduces the degree of escape of volatile isocyanate (HNCO) during pyrolysis and promotes its further reaction with the solid matrix (alkaline earth metal oxide matrix), thereby improving the raw material utilization rate and dicyandiamide yield. In particular, when the pressure in the dynamically sealed continuous rotary kiln is 0.2 MPa, the yield of the obtained dicyandiamide is 93.5% while maintaining a purity of 99.88%.

This invention provides a low-halogen alkaline oxide composite additive for industrial silicon submerged arc furnaces and its application method. The additive contains at least magnesium and calcium source components, respectively, based on MgO and CaO equivalents. The fluxing and reinforcing component is selected from alkali metal oxides or alkaline earth metal oxides. The additive is added at a rate of 0.03-1% based on silica mass, and the halide content, based on Cl, is ≤0.5%. Using this additive can effectively reduce the softening temperature of siliceous raw materials and the reaction resistance in the furnace, reducing unit power consumption by 2-20% and increasing the daily output of the submerged arc furnace. Simultaneously, under the constraint of low halogen content, the chloride content of the microsilica powder does not increase. The calcium source component can be provided by industrial solid waste such as calcium carbide dust / calcium carbide slag and is compatible with the magnesium source, achieving stable smelting results under the condition of meeting the equivalent ratio. This invention is also applicable to the smelting of silicon-based ferroalloys such as ferrosilicon in submerged arc furnaces, helping to improve furnace stability and iron tapping smoothness.

This application discloses a method for producing acetonitrile, comprising the following steps: in a reactor, contacting an acetate, ammonia, and a catalyst to react and obtain acetonitrile; wherein the acetate is selected from at least one of methyl acetate, ethyl acetate, propyl acetate, butyl acetate, and cyclohexyl acetate; wherein the catalyst is composed of a support and a divalent transition metal oxide, an alkaline earth metal oxide, and an alkali metal oxide supported on the surface of the support; wherein the divalent transition metal oxide is selected from at least one of manganese oxide, ferrous oxide, cobalt oxide, nickel oxide, copper oxide, and zinc oxide; wherein the alkaline earth metal oxide is selected from at least one of magnesium oxide, calcium oxide, strontium oxide, and barium oxide; and wherein the alkali metal oxide is selected from at least one of lithium oxide, sodium oxide, and potassium oxide.

The application discloses a kind of electronic packaging glass substrates, belong to electronic glass technical field.It includes the following according to the mole percentage of raw materials:69%‑71%SiO2, 13%‑14%Al2O3, 1%‑2.5%B2O3, 0.5%‑1%Dy2O3, 0.5%‑1%Gd2O3, 0.2%‑0.4%MnO, 0.2%‑0.4%NiO, 0.5%‑1%ZnO and 11%‑14%alkaline earth metal oxide.By introducing the combination of transition metal oxide and rare earth oxide, precise control of dielectric properties is achieved, based on aluminosilicate system, and the ratio of alkaline earth metal oxide is controlled, so that the thermal expansion coefficient of the glass is maintained stable, thereby providing dimensional stability and packaging reliability;Therefore, the application has important application value in the field of electronic glass technology.

An inorganic fiber containing silica, alumina, one or more alkali metal oxides, and one or more alkaline earth metal oxides, transition metal oxides, or lanthanide metal oxides. The inorganic fiber exhibits good thermal performance at service temperatures of 1260°C and above, retains mechanical integrity after exposure to service temperatures, is free of crystalline silica after devitrification, is resistant to alkali flow, exhibits low biopersistence in an acidic medium, and exhibits low solubility in a neutral medium. Thermal insulation products incorporating inorganic fibers, a method for preparing the inorganic fiber, and a method for thermally insulating articles using thermal insulation prepared from inorganic fibers are also provided.

The present invention relates to a composition comprising: (a) at least one first powder comprising (i) at least one inorganic oxide, preferably metal oxide, and more preferably alkaline earth metal oxide, and (ii) at least one fatty acid or salt thereof, preferably saturated fatty acid or salt thereof, and more preferably metal salt of saturated fatty acid; and (b) at least one second powder selected from particles comprising silica and hydroxyapatite. The composition according to the present invention can provide a keratin material such as skin with, at least, an acceptable level of sebum control.

The present application pertains to processes producing oxides using a weak acid intermediate. In one embodiment a material comprising calcium carbonate is reacted, with a solution comprising aqueous carboxylic acid to form a gas comprising carbon dioxide and a solution comprising aqueous calcium carboxylate. The solution comprising aqueous calcium carboxylate is reacted with sodium sulfate to form a solution comprising aqueous sodium carboxylate and a solid comprising calcium sulfate. The solution, comprising aqueous sodium carboxylate is reacted with sulfur dioxide to form sodium sulfite and an aqueous carboxylic acid. The sodium sulfite is separated from said aqueous carboxylic acid and reacted to form a solid comprising calcium sulfite which is decomposed to form calcium oxide and sulfur dioxide.

This invention provides a low-dielectric borosilicate glass for TGV packaging with a controllable gradient of thermal expansion coefficient and its preparation method. The glass composition, by molar percentage, includes: SiO₂ 60-70%, Al₂O₃ 0.4-4%, B₂O₃ 1-6%, Na₂O 8-18%, K₂O 4-15%, ZnO 8-16%, and alkaline earth metal oxides 10-15%. A high thermal expansion coefficient (≥110×10⁻⁷ / ℃) is achieved through alkali metal oxides, while ZnO is introduced to suppress ion migration and maintain low dielectric loss (<0.002 at 1 GHz). A two-step sintering process is used to construct a gradient thermal expansion layer that increases from the center to the edge, effectively buffering the thermal stress of heterogeneous materials. This invention also provides a SEM-thermal stage combined detection method to achieve rapid and accurate measurement of the thermal expansion coefficient of glass micropowder.

The application belongs to the technical field of medical chemistry synthesis, and particularly relates to a method for preparing dicyandiamide by preventing fouling of urea pyrolysis, which comprises a process of reacting raw materials of urea, alkaline earth metal oxide and scale inhibition dopant, wherein the scale inhibition dopant comprises at least one of silicon dioxide and titanium dioxide, and the weight of the scale inhibition dopant accounts for 0.1% to 5% of the weight of the alkaline earth metal oxide. Experiments show that the introduction of the scale inhibition dopant in the reaction system can change the surface tension of the isocyanate melt, help to improve the surface properties and rheological state of the intermediate melt, reduce the adhesion and aggregation of the material on the reactor wall surface, reduce the risk of fouling and plugging, even eliminate the fouling of the reactor wall surface, and improve the stability of continuous production.

This invention belongs to the field of pharmaceutical chemical synthesis technology, specifically relating to a method for preparing pharmaceutical-grade dicyandiamide by urea pyrolysis. It includes a process for preparing a hydrogen-containing intermediate and a process for preparing dicyandiamide from the hydrogen-containing intermediate. The process for preparing the hydrogen-containing intermediate involves continuously co-feeding urea and alkaline earth metal oxides into a dynamically sealed reaction system at a molar ratio of 2.05:1.00 to 2.15:1.00, sequentially passing them through three hot zones to obtain a cyanide-containing intermediate. Experiments show that reasonable molar ratio control, combined with the three hot zones, can reduce side reactions and impurity accumulation caused by feed imbalance, thereby reducing the risk of melamine formation at the source. In particular, when the molar ratio of urea to alkaline earth metal oxides is 2.10:1.00, the obtained dicyandiamide has a purity of 99.88%, a melamine content of <0.01%, and a heavy metal content of 2g / 100g, all meeting pharmaceutical-grade quality requirements.

This invention belongs to the field of pharmaceutical chemical synthesis technology, specifically relating to a method for preparing high-yield dicyandiamide by urea pyrolysis. The method includes a reaction process using urea and alkaline earth metal oxides as raw materials in a sealed environment, wherein the reaction pressure is 0.1 to 0.3 MPa. Experiments show that by maintaining a positive pressure environment of 0.1 to 0.3 MPa in a dynamically sealed continuous rotary kiln, the volatilization loss of isocyanate (HNCO) is suppressed from a physical process perspective. This reduces the degree of escape of volatile isocyanate (HNCO) during pyrolysis and promotes its further reaction with the solid matrix (alkaline earth metal oxide matrix), thereby improving the raw material utilization rate and dicyandiamide yield. In particular, when the pressure in the dynamically sealed continuous rotary kiln is 0.2 MPa, the yield of the obtained dicyandiamide is 93.5% while maintaining a purity of 99.88%.

Heavy metal-free, recyclable, environmentally friendly molded parts and insulating materials (1), containing carbon dioxide and / or pollutant-adsorbing materials (1), excluding silver and iron (2) at least one denatured fungal mycelium as the first component, (3) at least one particulate second component selected from the group consisting of (3.1) Alkaline earth oxides and / or hydroxides, (3.2) Mixtures of at least one alkaline earth oxide and / or hydroxide (3.1) and at least one component (3.2.1) which forms sparingly soluble carbonates with carbon dioxide and / or which adsorbs carbon dioxide, (3.3) pyrogenic biochars and (3.3) Anion exchangers in the OH form, metal-organic frameworks (MOFs), covalent organic frameworks (COFs) and porous electron-rich covalent organonitride frameworks (PECNOFs), wherein the filaments (2.2) of the denatured fungal mycelium (2) form a network (2.1) that completely or partially encloses the particles of the at least one particulate second component (3).

This invention relates to the field of optical fiber imaging and the preparation of its glass materials, and particularly to an environmentally friendly, low-refractive-index, corrosion-resistant glass and its preparation method. Its composition, by molar percentage, comprises the following components: 68-82% SiO2, 3.5-8% B2O3, 0.1-0.3% CeO2, 8-14% alkali metal oxides, 3-9% Al2O3, 1-5% alkaline earth metal oxides, and 0.1-1.5% CaF2, 0.1-0.5% ZrO2, and 0.1-0.5% Y2O3. The total content of SiO2, Al2O3, and B2O3 in this composition is 84-91%. The glass material provided by this invention has a low refractive index and suitable thermal expansion coefficient and softening temperature properties, and can be used as a skin glass material in the fabrication of optical glass fibers and fiber optic panels.

The present invention relates to silicate glass comprising 35-45% by mass of silicon dioxide (SiO2), up to 15% by mass of molybdenum trioxide (MoO3), 4-7% by mass of zirconium dioxide (ZrO2), 1-3.5% by mass of phosphorus pentoxide (P2O5), and 14-28% by mass of one or more alkali metal oxides and / or one or more alkaline earth metal oxides, wherein the mass percentages thereof are expressed relative to the total mass of the glass. The present invention also relates to a method for improving the solubility of molybdenum in a glass molten material.

This invention provides a method for preparing hydrocarbons, the method comprising the following steps: (S1) heat-treating organic waste in the presence of a heat transfer medium to generate a first mixed gas; (S2) reforming the first mixed gas with steam in a first fluidized bed reactor to generate a second mixed gas; (S3) separating the second mixed gas into a first stream containing carbon dioxide and a second stream containing hydrogen and carbon monoxide; (S4) feeding the first stream separated in step (S3) into a second fluidized bed reactor and converting it into carbon monoxide via a reverse Boudouar reaction; (S5) mixing the second stream with the carbon monoxide converted in step (S4) to prepare a third mixed gas; (S6) generating syngas from the third mixed gas via a water-gas shift reaction; and (S7) generating hydrocarbons from the syngas via a catalytic reaction, wherein the heat transfer medium contains 1 to 40% by mass of iron (Fe) and 5 to 50% by mass of alkaline earth metal oxides.

The application belongs to the technical field of organic hydrogen storage material, and particularly relates to a synthesis method of an organic hydrogen storage material 3,6-dihydropyrrolo[3,2-e]indole. The synthesis method comprises the following steps: putting raw materials and a catalyst into a reactor, reacting at 25-250 DEG C for 0.1-72 hours, and obtaining 3,6-dihydropyrrolo[3,2-e]indole by separating and purifying the reaction product; wherein the raw materials are one of p-phenylenediamine and 5-aminoindole or a mixture of the two, and ethylene glycol; the catalyst is a combination of catalyst X and catalyst Y, or the catalyst is a composite catalyst C; catalyst X is a noble metal or a noble metal element supported by a carrier; catalyst Y is one or more of alkali metal oxides, alkali earth metal elements, alkali earth metal oxides, partial group IIIA or group IV A elements, zinc elements, copper elements, zinc oxide and copper oxide. The one-step synthesis method has high atom economy and is simple to operate without multi-step protection reaction.

The present application relates to the technical field of catalyst preparation, and discloses a pre-reduction methanation catalyst and a preparation method and application thereof.The catalyst comprises an active component, a carrier and an additive; the carrier comprises alumina, the additive comprises alkaline earth metal oxide and rare earth metal oxide, and the active component is Ni; the content of nickel is 20-65% by weight based on the total amount of the catalyst in terms of oxide; the number of active centers of the catalyst after re-reduction treatment is 0.03-0.41 mmol of hydrogen gas per gram of catalyst; the re-reduction treatment conditions comprise a temperature of 280 DEG C, a time of 2 hours, a hydrogen-containing and argon-containing atmosphere with a hydrogen concentration of 10% by volume, and a gas volume ratio of 15000; and the particle size of the catalyst is 1-6 mm.The catalyst has good reduction degree, good reactivation performance, many active centers and good stability.

A baking support for a ceramic powder comprising an oxide of alkali and / or alkaline earth, comprising a porous ceramic body for containing said powder, said body having an open porosity of between 10 and 40%, and a median equivalent pore diameter of between 0.1 and 25 micrometers and comprising a sintered material consisting, for a total of 100% and in mass percentages on the basis of the mass of said material: - between 55% and 75% of silicon carbide (SiC) - between 20% and 35% of corundum (Al2O3) - less than 10% of free silica, - less than 10% in total of other oxide phases.