35results about How to "Control aggregation" patented technology

The invention relates to an environmentally-friendly organic nutritional health-care puerarin powder plant candy and a preparation method thereof, belongs to a nutritional health-care plant candy, and particularly relates to a nutritional health-care plant candy in which puerarin powder or fern root powder is taken as a principal raw material. The invention provides a plant candy which is rich in nutrient and has a health-care value. The plant candy is mainly prepared from the following raw materials in percentage by weight: 96%-20% of sugar raw materials and 4%-80% of puerarin powder or fern root powder, wherein the total weight percent of all components is 100%.

The invention discloses a preparation method of cerium oxide microspheres, which comprises the following steps: preparing spherical cerous carbonate by a vapor phase diffusion process by using polyelectrolyte as a shape control agent; and carrying out high-heat treatment to obtain the CeO2 microspheres with high specific area. The particle size of the CeO2 microspheres is 300-500nm, and the specific area reaches more than 110 m<2> / g after the CeO2 microspheres are roasted at 500 DEG C. The vapor phase diffusion process is utilized for the first time to prepare the cerium oxide microspheres, and the whole reaction process is carried out at room temperature, so that the invention has the advantages of mild reaction conditions and simple preparation method and is easy to control. The polyelectrolyte is used as the shape control agent for the first time to regulate the shape of the cerous carbonate, thereby regulating the shape of the cerium oxide. Cations and anions of the polyelectrolyte in the water solution can regulate the aggregation of ions and control the shape and size of the cerous carbonate, thereby controlling the shape and size of the cerium oxide. The cerium oxide with high specific area has important applications in catalytic materials of automobile exhaust catalytic purification, petroleum cracking, chemical engineering and the like.

The invention belongs to the field of high polymer materials, and relates to low-molecular-weight polyurethane resin and an application thereof in tackifying resines. The low-molecular-weight polyurethane resin is prepared through the following steps: adding small-molecular-weight dihydric alcohol into a tank reactor, and heating, vacuumizing and dewatering under inert gas protection; and cooling the dehydrated dihydric alcohol material, adding diisocyanate for multiple times, adding the diisocyanate for the next time after the temperature is reduced to 70 DEG C or below after each time of addition, and continuing the reaction after the addition is finished to obtain the low-molecular-weight polyurethane resin. The molecular weight and the structure are adjustable, and the glass transition temperature can be selected as required. In addition, according to the low-molecular-weight polyurethane provided by the invention, cross-linking is greatly reduced by controlling a reaction process, so that the low-molecular-weight polyurethane is easily dispersed in polyol, a solvent and a polyurethane adhesive. In addition, the low-molecular-weight polyurethane provided by the invention contains active groups and can be chemically reacted with the adhesive, so that more excellent body strength of the adhesive is provided.

The present invention discloses a propylene-to-acrylic acid oxidation absorption system and a method thereof. The system is characterized by comprising a propylene vaporization tower, a first oxidation reactor, a second oxidation reactor and a three-in-one tower, wherein the top portion of the propylene vaporization tower is provided with a mixing superheater, the top portion outlet of the mixing superheater, the top portion inlet of the oxidation reactor and the bottom portion outlet of the second oxidation reactor are sequentially connected in series with the lower end inlet of the three-in-one tower, a product steam generator is arranged between the second oxidation reactor and the three-in-one tower, and an upper portion washing water steam stripping section, a middle portion acrylic acid absorption section and a lower portion reactant cooling section are arranged inside the three-in-one tower. The system and the method have the following advantages that the finally obtained acrylic acid solution has characteristics of high concentration and low impurity content, and characteristics of safety, environmental protection, energy saving and effective oxidation catalyst protecting are provided.

The invention provides a highly-efficient synthetic method for 2, 6-dimethoxy-4-vinylphenol. The method comprises the following steps: with sinapic acid as a raw material and alumina as a solid-phase carrier, carrying out thermal decarboxylation in the presence of an alkaline catalyst under a microwave-assisted condition, adding a polymerization inhibitor to reduce and prevent polymerization of synthetic products, neutralizing the alkaline catalyst in the reaction system when the reaction is completed, extracting the synthetic products with an organic solvent, carrying out washing and drying, then carrying out purifying by using preparative liquid chromatography, and carrying out vacuum drying to obtain high-purity 2, 6-dimethoxy-4-vinylphenol. The highly-efficient synthetic method for 2, 6-dimethoxy-4-vinylphenol provided by the invention has the characteristics of significant improvement of reaction rate, fast temperature rise, convenient operation, high conversion rate, easy purification of the products, etc.; and the synthesized 2, 6-dimethoxy-4-vinylphenol has the properties of high purity, strong oxidation resistance, etc.

The invention discloses a TEP-based coagulant regulation and control method and application thereof. The regulation and control method is obtained through a coagulant regulation and control model, and the regulation and control model is established based on dynamic regulation and control data obtained under a dynamic filtering condition and quantitative data obtained through a first fixed test, wherein the dynamic regulation and control data comprises the coagulant concentration obtained under the dynamic filtration condition and the value of the first quantitative characteristic of the TEP simulation pollutant corresponding to the coagulant concentration; and the quantitative data includes the coagulant concentration obtained in the first fixed test and a value of a second quantitative characteristic of the TEP simulated contaminant corresponding thereto. According to the method, an accurate, efficient and optimal regulation and control scheme can be obtained, the polymerization behavior of pollutants and deposition of the pollutants on the surface of the membrane can be controlled through the regulation and control scheme, and the purpose of preventing and controlling membrane pollution is achieved.

The invention discloses a method for preparing starch nanoparticles with controllable particle size by an emulsifier-assisted biological enzyme method, which is characterized in that it specifically comprises the following steps: (1) preparing a buffer solution; (2) activating a debranching enzyme; (3) ) preparation of starch milk; (4) gelatinization (stretching of starch chains); (5) enzymatic debranching; (6) separation of short straight chain solutions; (7) deactivation of enzymes; (8) adding emulsifiers to control the crystallization process; (9) recrystallization; (10) drying. The invention has low equipment requirements, simple process, easy operation, mild reaction, short reaction time, high efficiency, and is suitable for large-scale production; the product performance is good, and the particle size of the prepared starch nanoparticles can be controlled between 9-30nm, and the dispersibility is excellent. It has good thermal stability, low preparation cost, less energy consumption, no harmful waste generation, and meets the modern production requirements of green production, environmental protection and energy saving.

The invention discloses a nitrogen-phosphorus co-doped metal-organic framework-encapsulated platinum-cobalt-based alloy, a preparation method and application thereof, and belongs to the technical field of fuel cell nano-catalyst synthesis. Dissolve the platinum precursor, cobalt precursor and doped metal precursor in isopropanol, and adjust the pH of the solution to > 11; stir at room temperature under a protective gas environment to obtain a metal salt mixed solution; impregnate ZIF‑67 into the metal In the salt mixed solution, seal the ultrasonic wave and let it stand still, then disperse it in the polyol solvent, stir and reflux under the atmosphere of protective gas and heat the reaction; drop NaBH dissolved in isopropanol 4 Solution, react for a period of time; after stopping the reaction, cool to room temperature, centrifuge to separate the solid product, wash, and dry; grind and mix adenine phosphate and the dried solid product, then heat-treat, and cool to room temperature to obtain the product. The method has the advantages of simplicity, safety, etc., and is especially suitable for the preparation of cathode catalysts for fuel cells and metal-air batteries.

The invention relates to the field of solid waste resource utilization, and provides a production process for preparing alkali cementitious materials from coal gangue, comprising the following steps: (1) sending the coal gangue for crushing, ball milling, and sieving to obtain coal gangue powder; (2) Put the coal gangue powder into the mixed acid solution, stir evenly, let it stand for several days, suction filter and dry; (3) mix the coal gangue powder obtained in step (2) with the salt mud, calcine at high temperature, and then ball-mill for a second time after cooling , sieve to obtain mixed powder; (4) weigh each raw material by the following parts by weight: 50-80 parts of mixed powder, 20-40 parts of slag powder, 4-8 parts of activator, 24-36 parts of water; (5 ) Mix the raw materials evenly to obtain the alkali gelling slurry; (6) inject the alkali gelling slurry into the mold and vibrate for molding, cure at normal temperature until demoulding, and steam at 66-72° C. for 8 hours. The invention not only solves the problems of resource waste and environmental pollution of coal gangue waste, but also prepares an alkali gelling material with excellent performance.

The invention provides a preparation method for converting glycerol into a glycerol derivative system simultaneously containing glycerin ether and glyceride to be used as a fuel additive. Low-carbon alcohol and glycerol are used as starting materials, the mol ratio of the low-carbon alcohol to the glycerol is 2:1 to 8:1, the dosage of acid catalysts accounts for 0.5 percent to 10 percent of the total mass of reactants, water absorbents account for 1.5 percent to 10 percent of the total mass of the reactants, nitrogen gas is used for replacing air in a kettle, the initial pressure in the kettle is 0 to 4 MPa, the reaction temperature is 30 to 130 DEG C, and the reaction time is 4 to 10 hours; and the reduced pressure distillation is carried out after cooling, then, the acylation reaction is carried out, the reaction temperature is 60 to 150 DEG C, the reaction time is 1 to 4 hours, and glyceryl biological fuel additives are obtained. The fuel combustion performance can be improved through glycerin ether, and simultaneously, the fuel viscocity can be improved through the contained glyceride. The acidylation is carried out after the etherification, and the problem of low glycerol hydroxyl etherification rate is solved, so the additives and the fuel are mixed more uniformly. The catalyst and the water absorbents recovered through filtering and the low-carbon alcohol can be repeatedly utilized.

The invention discloses a method for synthesizing polycarboxylate superplasticizer through a RAFT method. According to the method, firstly, macro-monomers A are added into a reaction kettle, water is added, water bath heating is performed till the temperature is 65-85 DEG C, and constant-temperature stirring is performed; then, a trithio ester chain transferring agent is dissolved in a mixed solution of micro-monomers B and water, the mixture is dropwise added into the reaction kettle at constant speed, and meanwhile an initiator aqueous solution is dropwise added; after all the needed matter is dropwise added, a stirring reaction lasts for 3-5 h under the continuous constant-temperature stirring condition of 65-85 DEG C; after the reaction ends, an alkali solution and water are added to adjust PH to 6-7, and the polycarboxylate superplasticizer is obtained after reaction products are cooled to room temperature. By means of the method, the molecular-structure-controllable polycarboxylate superplasticizer can be prepared, the molecular weight is controllable, the molecular weight distribution range is narrow, polymer molecule design can also be performed, and the method has great significance in research and development of the polycarboxylate superplasticizer synthetic technology.

The invention discloses a poly(carbonic ester-ether) type polyurethane resin and a preparation method thereof and leather pulp, belonging to the technical field of leather pulp. The technical problems that raw materials for preparation of polyurethane leather pulp depend on petrochemical products and a catalyst used in the preparation has potential hazards in the prior art are overcome in the invention. The leather pulp provided by the invention comprises, by weight, 85 to 120 parts of the poly(carbonic ester-ether) type polyurethane resin, 0.26 to 0.98 part of a surfactant, 0.42 to 1.3 parts of an antifoaming agent, 0.13 to 0.27 part of a leveling agent and 128 to 200 parts of dimethyl formamide, wherein the structural formula of the poly(carbonic ester-ether) type polyurethane resin is shown in a formula I as described in the specification. The leather pulp does not depend on petroleum resources, is safe and environment-friendly, has excellent tensile strength and elongation at break and does not undergo yellowing under long-term irradiation of ultraviolet rays, wherein tensile strength is as high as 60 MPa and elongation at break is as high as 1200%.