33results about How to "Good peptization" patented technology

The invention discloses preparation methods for a macroporous alumina carrier and a hydrodemetallization catalyst. The preparation method for the macroporous alumina carrier includes the following steps: (1) dry pseudoboehmite gel powder is hydrothermally processed under high pressure; (2) the dry pseudoboehmite gel powder obtained in step 1 is kneaded into a plastic, and pore-expanding agent is added in step 1 or step 2; (3) the plastic obtained in step 2 is shaped, the shaped material is dried and baked, and thereby the macroporous alumina carrier is obtained. The impregnation method is adopted to prepare the hydrodemetallization catalyst. The hydrodemetallization catalyst prepared by the method has large pore volume and pore diameter, centrally distributed pores, moderate mechanical strength and high activity and activity stability.

The invention discloses a heavy oil or residual oil hydrogenation catalyst and a preparation method thereof. The catalyst carrier is prepared from silicon-containing aluminum hydroxide prepared by using a clay modified raw material as a crystal seed, active metal ingredients comprise VIII and VIB metals, and the silicon dioxide content of the catalyst is 0.1 to 45 weight percent. The preparation method for the catalyst comprises the following processes of: preparing the silicon-containing aluminum hydroxide, then adding proper glue solvent and additive for molding, performing drying and roasting to obtain the heavy oil or residual oil hydrogenation catalyst carrier, soaking the residual oil hydrogenation catalyst carrier into the active hydrogenation metal ingredients, and then performingdrying and roasting to obtain the heavy oil or residual oil hydrogenation catalyst. The physical and chemical properties and the use performance of the catalyst, particularly the use performance in the heavy oil or residual oil hydrogenation process, can be obviously improved.

The invention discloses a heavy oil hydrocracking catalyst, and a preparation method and applications thereof. According to the heavy oil hydrocracking catalyst, high-silicon aluminium oxide is taken as a carrier; VIII family metals and VIB family metals are taken as active metal ingredients. A preparation method of the high-silicon aluminium oxide carrier comprises following steps: modified clay obtained via high temperature roasting is added into an aluminum-containing alkaline liquor so as to obtain a suspension liquid; the suspension liquid and acidic silica sol are subjected to parallel flow gel forming; an alkaline solution is added for further gel forming; and the high-silicon aluminium oxide carrier is obtained via aging, filtering, and drying. The high-silicon aluminium oxide carrier is excellent in comprehensive performance such as pore structure and acidic properties; the heavy oil hydrocracking catalyst prepared by taking the high-silicon aluminium oxide carrier as a carrier is high in impurity removing rate and heavy oil conversion rate, and long in running period in heavy oil ebullated bed hydrocracking technological process.

The invention relates to a method for preparing pseudo-boehmite by pulverized fuel ash, which comprises the steps of: pretreating the pulverized fuel ash; roasting the pretreated pulverized fuel ash and Na2CO3 at the high temperature to obtain silicon-rich gel and a coarse AlCl3 solution; preparing a purified sodium metaaluminate solution by the coarse AlCl3 solution; adjusting the concentration of the purified sodium metaaluminate solution to be 0.8-2.0mol/L, adding a NaHCO3 solution with the concentration of 0.8-2.0mol/L, and carrying out reaction to obtain gel; carrying out ageing on the product for 10-30hours under the conditions that the temperature is 50-100 DEG C and the pH value is 7-11; filtering and separating to obtain a filter cake and a filtrate; and washing the filter cake by deionized water and drying to obtain the pseudo-boehmite finished product. The invention provides a new technical route for preparing the pseudo-boehmite with high added-value by the low-cost pulverized fuel ash, and the pulverized fuel ash is processed and treated, so that the environmental pollution caused by the pulverized fuel ash is reduced.

The invention provides a sodium hydrosulfite composition and a preparation method thereof. The sodium hydrosulfite composition contains the following steps of: sodium hydrosulfite, an inorganic salt coating agent and a polymer coating agent, wherein the inorganic salt coating agent contains sulfate and hydrochloride; the polymer coating agent is selected from one or more of polyethylene glycol, poval, polyacrylate and a maleic acid-acrylic acid copolymer. Compared with the conventional sodium hydrosulfite composition, the sodium hydrosulfite composition has the advantages of safety and stability in transportation and storage, slow and sustained release in the using process and low using amount during use.

The invention discloses a method for preparing a catalytic cracking catalyst, which comprises steps of mixing and pulping aluminum binder and acid. The method is characterized by also comprising steps of adding alkali into slurry to improve the pH value of the slurry, and then adding the acid into the slurry to reduce the pH value of the slurry. The method can stabilize the quality of the prepared catalyst.

The application relates to a method for producing boehmite by using washing liquor from the production of washing red mud by alumina, which comprises the following steps: delivering washing liquor from the production of the washing red mud by alumina to a desilicication tank, and adding red mud and lime to perform desilicication; when a desilicication index is more than or equal to 400 as required, filtering the product of the desilicication, transferring filtrate to a diluting tank for cooling, cooling to 20 to 60 DEG C, performing carbonation gelatinizing by using 20 to 60 volume percent CO2 gas obtained by concentrating and enriching CO2 waste gas generated in the production of alumina as a precipitator; heating the gelatinized slurry to 70 to 100 DEG C, keeping the temperature for 1 to 6 hour and aging; and washing the aged slurry with washing equipment, filtering the aged slurry to obtain filtrate and filter cake, and drying the filter cake by using drying equipment to obtain powdery boehmite. The method has the advantages of low production raw material cost and rich raw material source, is favorable for alumina production liquid balance, improvement on finished alumina yield, reduction of Al2O3 content of red mud discharged to the outside and recovery of alumina CO2 waste gas and is in accordance with the national circulating economy and waste recycling principle. The product produced has high crystalline phase purity and high peptizing performance and can be used as a binder, a drier, a purifier, a catalyst, a catalyst carrier and the like.

The invention discloses apseudo-boehmite preparation method, which comprises: (1) preparing a sodium metaaluminate solution; (2) simultaneously adding the sodium metaaluminate solution with the prepared Al2O3 concentration and an aluminum sulfate solution into a reaction kettle in a parallel flow manner according to a certain ratio, carrying out a reaction, transferring the slurry into another gas-liquid reaction kettle after the reaction, introducing carbon dioxide gas into the gas-liquid reaction kettle, controlling the volume ratio of air to carbon dioxide, and carrying out a reaction; and(3) carrying out aging, exchange washing, filtering and drying on the obtained product to obtain the special pseudo-boehmite dry powder special for ceramic corundum abrasive materials. According to the invention, the prepared pseudo-boehmite is low in impurity content, good in peptization, good in gelling property, good transparency in gel, high in gel viscosity and good in adhesive property, andis special pseudo-boehmite for ceramic corundum abrasive materials; and by adopting the method, the yield of the single-kettle pseudo-boehmite can be greatly improved, so that the production cost is greatly reduced.

The invention provides haze-reduction paint for building wall surfaces and a preparation method. The method includes the steps: firstly, preparing pseudo-boehmite sol coated tourmaline loaded zinc oxide nano-crystalline composite spherical fine particles to serve as photocatalysts; secondly, preparing slurry from the particles, nano-silicon dioxide, nano-wollastonite, super-fine talcum powder, defoaming agents, dispersing agents, coalescing agents, preservatives and water; finally, matching the slurry, organosilicone acrylic resin and thickening agents to form the haze-reduction paint for thebuilding wall surfaces. By the aid of a pseudo-boehmite sol coated tourmaline loaded zinc oxide nano-crystalline composite material with the advantages of large specific surface, high pore volume andthe like, outward flow of catalytic active matters is avoided, the haze-reduction paint is provided with a adsorbent with excellent performance, the paint and the zinc oxide nano-crystalline are compound, high adsorption capacity of the adsorbent and visible light drive photocatalysis to degrade cationic organic pollutants, air quality is improved, the paint has remarkable effects on control of large-area haze, and further, and the paint is simple in preparation process, low in raw material cost and suitable for large-scale popularization.

The invention provides a stabilizer for pasteurized yoghurt, the pasteurized yoghurt and a preparation method of the pasteurized yoghurt. The stabilizer is prepared from the following raw materials inparts by weight: 30-40 parts of hydroxypropyl distarch phosphate, 15-25 parts of pectin, 4-7 parts of instant agar, 10-15 parts of gelatin, 20-30 parts of propylene glycol alginate and 10-20 parts ofsoybean polysaccharide. By means of a compounding technology, a plurality of suitable thickeners are selected for compounding, so that a synergistic effect can be achieved between raw materials, stability, thickness, smoothness and the like of the prepared yoghurt can also be obviously improved under the condition of lower consumption of the stabilizer, smoothness of the yoghurt can be increased,precipitation of whey in the yoghurt can be reduced, the change of total acidity of the yoghurt in the shelf life is obviously reduced, the shelf life of the yoghurt is prolonged, the state of the yoghurt in the shelf life of three months is unchanged, and the system is uniform and free of water bleeding.

The invention provides a preparation method of macroporous active alumina dry glue with a high peptizing index. The preparation method comprises the following steps: step 1, neutralizing an aluminum sulfate solution and a sodium metaaluminate solution in a parallel flow manner to gelatinize; and step 2, aging, water-washing, drying and crushing the finished product gelatinized in the step 1 to obtain the activated aluminum oxide. The preparation method has the beneficial effects that the active aluminum oxide product with high peptizing index, large pore volume and large specific surface area can be obtained by controlling the gelatinizing process, raw material indexes and the like.

The invention relates to a strip desulfurizing agent and a preparation method thereof. The preparation method comprises the following steps: respectively determining the water content of all raw material powder, comparing the water content and adjusting the water contents of the all the raw material powder within the optimal range of the water content; respectively determining the bulk density ofall the raw material powder, comparing the bulk density of all the raw material powder and adjusting the bulk density of all the raw material powder within the corresponding optimal range of the bulkdensity of all the raw material powder; according to the ratio of the raw materials of the strip desulfurizing agent, mixing all the raw material powder, milling the mixed raw material powder and extruding the milled raw material powder into strips, and then sequentially drying and roasting the strips, so as to obtain a finished product strip desulfurizing agent. According to the preparation method, through the synergism of effects achieved by control on the water content and the bulk density of the raw material powder, the diversity factor of crushing strength of the strip desulfurizing agentproduct is greatly decreased, and the quality of the strip desulfurizing agent product is improved.

The invention provides pseudo-boehmite easy to peptize, and a preparation method of the pseudo-boehmite. The peptization index of the prepared pseudo-boehmite can reach 99%-100%. When the pseudo-boehmite is used for preparing a FCC catalyst, the dosage of hydrochloric acid in a gelling process can be reduced by 60%-70%, so that the production cost of the FCC catalyst is reduced, and the equipmentcorrosion is reduced. According to the invention, the preparation process of pseudo-boehmite is simplified, and the raw materials are mixed by a pipeline mixer at room temperature and then directly enter an aging process, so that the energy consumption is reduced, and the productivity is improved.