261 results about "Peptization" patented technology

The invention discloses a micro-porous alumina carrier and relative preparing method, which contains boric oxide and another agent selected from phosphor, silicon, zirconium, and titanium. The invention adds the boric acid into water or peptizate acid whose temperature is higher than room temperature, then adds the mixture of alumina leading material and physics expanding-hole agent to be molded, dried, and burnt to attain the final carrier. The inventive carrier contains a proper agent, with the characters of large aperture, centralized distribution hole and a certain acid. And its surface acid and aperture can be adjusted easily. Therefore, the invention can overcome the defects of present technique which can not have aforementioned characters at the same time. The inventive alumina carrier can be used in variable hydrogenation catalyst.

A gamma-AlOOH nanocrystal powder able to be automatically dispersed in aqueous and some organic solvents for preparing self-dispersing superfine non-toxic aluminum hydroxide flame-retarding agent, or the high-molecular polymer / inorganic nano-material composition, or the microcrystalline alumina ceramics or high-performance alumina ceramics as grinding medium is prepared through reaction of sodium aluminate or Al salt solution in alkaline medium, extracting the generated deposit, adding peptizing agent and disperser, peptizing and dispersing to obtain aluminum hydroxide colloid, reacting on additive and surfactant for surface modifying, and spray drying.

The present invention provides a high temperature-resistant activated alumina material and a preparation method thereof. The alumina material is prepared by the following steps: mixing macroporous pseudo-boehmite, high viscosity pseudo-boehmite and an additive by using water; uniformly stirring at a rotation speed of 100-1000 r / min; adding dilute nitric acid with a concentration of 30% to carry out a reaction until the pH value is 2.0-5.5 and the solution is at the peptization state, and then aging for 3-6 hours at a temperature of 80-100 DEG C while stirring; adding a pore-forming agent at a room temperature, and carrying out uniform stirring, pulping, spraying and drying; and carrying out calcination at a temperature of 900 DEG C to prepare the alumina. The alumina material of the present invention has advantages of convenient mass production, high specific surface, and the like, wherein the specific surface of the alumina material of the present invention can be maintained more than 110 m<2> / g for a long time at a temperature of 1000-1100 DEG C. In addition, the preparation method of the alumina material has characteristics of simple process and low cost.

The invention discloses a method for continuously producing pseudoboehmite, belonging to the technical field of boehmite preparation. The method comprises the following steps: continuously adding a sodium metaaluminate solution into a reactor while introducing an air-carbon dioxide gas mixture, and forming a strong liquid flow of the sodium metaaluminate solution to be thoroughly mixed with the carbon dioxide gas; controlling the flow rates of the gas mixture and the sodium metaaluminate solution to control the temperature of the slurry generated by reaction at 25-55 DEG C and the pH value at 9.5-11; and after the slurry passes through a pipeline with a plurality of U-shaped bends, aging the slurry, filtering, washing with water, and drying to obtain the pseudoboehmite. The pseudoboehmite prepared by the method has the characteristics of large specific area and pore volume, reasonable peptization, continuous production, simple technique, high production efficiency, stable product quality, low equipment investment, reliable operation, low energy consumption, low labor intensity and the like, is convenient to operate and maintain, and is especially suitable for producing common pseudoboehmite, superfine aluminum hydroxide or aluminum oxide.

A TiO2 sol able to be solidified at ordinary temp to become anatase crystal type TiO2 is prepared through hydrolyzing the compound of inorganic titanium to obtain spontaneous crystal seed, ordinary-pressure hydrolyzing inorganic titanium compound under the action of said crystal seed to obtain white deposit, and dissolving in inorganic acid. Its advantages are low cost, low operation temp, and no pollution.

The invention provides a clean preparation method of a magnalium based laminated composite hydroxide. The method uses magnesium hydroxide, magnesium oxide, pseudo boehmite, inorganic acid and a material containing functional anions as raw materials, uses magnesium chloride or magnesium nitrate as a circulation medium, and uses the property of peptization under acidic condition of boehmite to improve the reaction activity of pseudoboehmite; the concentration of magnesium ions in solution is increased by using magnesium chloride or magnesium nitrate. The method accelerates the formation rate of laminated composite hydroxide, promotes the dissolution of magnesium hydroxide and magnesium oxide, shortens the reaction time, overcomes the defects of high reaction temperature and long time consumption in hydrothermal method for synthesis of laminated composite hydroxide, and can rapidly prepare magnalium based laminated composite hydroxide under mild conditions. Magnesium chloride and magnesium nitrate can be recycled; and the preparation process has no waste discharge, and is green and environment-friendly. The method has the advantages of abundant raw materials, low cost, simple preparation process, mild reaction conditions, and easiness to industrial production.

The invention relates to a preparation method of an amino silane modified gamma-Al2O3 thin film for toxic Cr (VI) adsorption. The preparation method comprises the following steps: firstly, under an acidic condition, peptizing industrial pseudo-boehmite powder, adding polyvinyl alcohol serving as a coalescing agent while peptizing, mixing for a period of time, performing hydrothermal treatment on sol, and performing tape casting, drying and baking on a sol product to prepare a gamma-Al2O3 thin film; and then, under the protection of N2, refluxing the gamma-Al2O3 thin film in a solvent with amino silane for a period of time, and washing and drying to obtain the amino silane modified gamma-Al2O3 thin film. Compared with the gamma-Al2O3 thin film before modification, the amino silane modified gamma-Al2O3 thin film prepared by the method is higher in removal rate and higher in adsorption performance for toxic Cr (VI) in water; meanwhile, the thin film adsorbing toxic Cr (VI) can be easily separated from water, so that the problem of a complicated process for separating and recycling a powdered adsorbent is solved, and the separation efficiency is greatly improved.

A method and apparatus for recovering oil from oil-containing sorbents, such as drill cuttings obtained from drilling with an oil-based mud. The method includes peptizing the substrate with an acid reagent and direct thermal desorption with combustion effluent gases at high temperature under turbulent mixing conditions. Another method disclosed includes upgrading the oil in the substrate to improve one or more of the properties of the recovered oil relative to the oil in the substrate, such as, lower aromatics content, lower sulfur content, lower functional group content, higher saturates, higher viscosity, higher viscosity index, and any combination thereof. The apparatus provides for efficient recovery of oil from the substrate with a short residence time, high throughput, low residual oil content in the treated solids and / or high percentage of oil recovery. The apparatus may be transported to a remote location for on-site treatment of drill cuttings or other oil-containing solids.

The invention provides a method of using TiCl4 to prepare a high-activity double-effect crystal seed and control titanium dioxide particle size. Specifically, the method employs TiCl4 as a raw material, a precipitate is prepared through a certain proportion and rapid neutralization of a dilute base solution, the precipitate is subjected to peptizing, curing and quenching and then is adjusted to have a proper pH value, then soluble salt compositions are removed through washing, so that the high-activity double-effect crystal seed, which is applied to hydrolysis process and calcining process of production of sulfuric-acid-process titanium dioxide, is prepared. The prepared crystal seed is uniform in particle size and high in activity, and also during application of hydrolysis of a titanium solution, by adjusting the addition amount of the seed crystal and cooperating with addition of a proper salt treating agent and control on calcining intensity, rutile type titanium dioxide with different particle sizes can be prepared, and thus the particle size demands on different products are satisfied. The preparation technology is simple, not high in equipment investment and high in operation controllability, and the prepared double-effect crystal seed is capable of producing titanium dioxide hydrate primary particles with uniform particle size, so that the uniformity of calcined product particle size is guaranteed, and optical performances and pigment performances of titanium dioxide are perfectly exhibited.

A method for producing a cobalt on alumina catalyst is disclosed. The catalyst is prepared by thoroughly mixing cobalt nitrate into a peptized alumina slurry, and then spray-drying the slurry to form attrition resistant microspheres. The cobalt prepared by this invention is fully reducible. Optionally, metals such as ruthenium can be added to the cobalt / alumina catalyst by impregnation or methods known in the prior art.