45 results about "Aluminium hydroxide gel" patented technology

The invention discloses a preparation method of a hydrotreatment catalyst, comprising the following steps of: introducing silicon and boron additives in the way that an organic silicon source is added after aluminium hydroxide gel forming and then a boron-containing organic compound solution is added, so as to obtain silicon and boron containing aluminium hydroxide, mixing parts of an active metal component with boron-containing aluminium hydroxide by a kneading method, carrying out three-stage roasting to obtain a catalyst intermediate, loading residual part of the active metal onto the catalyst intermediate by dipping, and drying to obtain the hydrotreatment catalyst. By the adoption of the method provided by the invention, the silicon and boron additives and the active metal component are uniformly distributed on the surface of the catalyst. In addition, the active metal component has different existing forms in the catalyst when introduced in the two modes, loss rate of the catalyst activity is reduced by mutual cooperation, and running period of a device is prolonged. The catalyst has large pore volume, large specific surface area, appropriate pore structure and acidity, and is especially suitable for hydrodenitrogenation process of heavy hydrocarbon.

The invention relates to a preparation method and a product of an insulation material used for industrial thermal equipment and boiler, which provides the preparation method and the product of the insulation material with advantages of good thermal insulation performance, low heat conduction coefficient, low production cost, little energy consumption, long product usage life, environmental protection and hurtlessness used for industrial thermal equipment and boiler. The preparation method comprises the following steps: adding urea CO(NH2)2 or ammonium hydroxide in an aluminum ion salt solution, performing a chemical reaction to obtain nano aluminium hydroxide gel; adding titanium dioxide with 2500 meshes in the nano aluminium hydroxide gel, according to the nano aluminium hydroxide gel with weight part of 79-96 parts, adding 6-21 parts of titanium dioxide, adding 10-20 parts of deionized water to obtain the nano aluminium hydroxide porous gel mixed with titanium dioxide; under 140-150 DEG C, and employing microwave heating for dehydrating to obtain the porous gamma-alumina wrapped titanium dioxide insulation material.

The invention discloses a method for preparing aluminum oxide nano-particles, comprising the following steps of: 1), uniformly mixing aluminum nitrate, urea and chlorinated 1-butyl-3-methylimidazole with the mass ratio of (10-20):(7.5-15):(0.5-1); 2) dissolving a mixture which is obtained in the step 1) by deionized water, reacting for 6-10 hours in sealing and heat preservation modes under the temperature of between 120 and 170 DEG C to naturally cool, and filtering, washing and drying a product; and 3) calcining the product which is prepared in the step 2) for 4-10 hours at the temperature of between 450 and 600 DEG C, and naturally cooling the product to the room temperature to prepare Al2O3 nano-particles. According to the method for preparing aluminum oxide nano-particles, the chlorinated 1-butyl-3-methylimidazole (BmimCl) and water are used as a dispersing system, aluminum nitrate and urea serving as a slow release formulation can be uniformly dispersed, and OH- in the urea can be more uniformly and slowly released so as to prepare aluminium hydroxide gel with high dispersion degree, high purity and uniform morphological structure; the aluminium hydroxide gel is calcined at the temperature which is subjected to temperature disclosure to prepare aluminum oxide nano-particles; and the granularity of the prepared aluminum oxide nano-particles is uniform and the granularity distribution is within the range of 10 to 20nm.

The invention discloses a method for preparing a coagulant and an application thereof. The method comprises the following steps: by taking industrial aluminium hydroxide as a main raw material, reacting with a sodium hydroxide solution under high temperature, cooling to room temperature, adding a hydrochloric acid solution into the reaction solution, controlling the basicity of the reaction solution to 2.4-2.7, and rapidly stirring to obtain an aluminium trichloride mixed solution with high basicity containing an active aluminium hydroxide gel; and heating and aging to obtain the coagulant after uniformly mixing the aluminium trichloride mixed solution with high basicity containing the active aluminium hydroxide gel. The invention also discloses an application of the coagulant prepared by the method for removing heavy metals in the water body. The preparation method provided by the invention is simple in process, low in energy consumption and small in device corrosion; and the obtained coagulant is good in stability without changing within 6 months, convenient to use and has a good removing effect on the heavy metals and the COD in the water body.