34results about How to "Help industrial production" patented technology

The invention discloses a method for preparing porous hydroxyapatite particles for deeply absorbing copper ions in solution, belonging to the technical field of chemical preparation. First, drop the phosphoric acid solution into the calcium hydroxide suspension containing citric acid to prepare a solution containing hydroxyapatite colloid. After washing with ammonium chloride, add polyvinyl alcohol with an average degree of polymerization of 350 or 1750, and then After hydrothermal treatment at C for 6 hours, cool to room temperature and centrifuge, dry the sediment at 60°C and put it in a solution containing polyethylene glycol (average molecular weight: 2000), dry at 80°C, and then heat up After calcination at 600°C and heat preservation for 2 hours, cooling with the furnace, the obtained particles were crushed and sieved to prepare porous hydroxyapatite particles for deep adsorption of copper ions in the solution. The process of the method is simple, the price of raw materials is low, the prepared porous hydroxyapatite particles have high porosity and low crystallinity, and the removal speed, high removal rate and high adsorption capacity of copper ions in the solution are fast.

The invention belongs to the technical field of analysis and discloses a method for detecting the purity of methyl 2-(2-chloro-1-ethylene)hydrazide formate. The detection method comprises the following steps: dissolving methyl 2-(2-chloro-1-ethylene) hydrazide formate in a diluent to obtain a control sample solution; dissolving a sample to be tested in a diluent to obtain a test sample Sample solution; take the control sample solution, detect with liquid chromatography, and record chromatogram A; take the sample solution to be tested, detect with liquid chromatography, and record chromatogram B; calculate the purity from chromatogram A and chromatogram B; The condition of phase chromatography comprises: mobile phase A and mobile phase B; Mobile phase A is phosphate buffered saline and acetonitrile; Mobile phase B is acetonitrile; The volume ratio of the phosphate buffered saline in mobile phase A and acetonitrile is (950 ± 8 ): (50±0.8). The detection method can accurately detect the purity of methyl 2-(2-chloro-1-ethylene) hydrazide formate in the sample to be tested.

The invention discloses a preparation method of a dialdehyde cellulose Salen MX catalyst. The method includes the steps of: 1) substituting the hydroxyl groups of 2nd and 3rd positions of cellulose into aldehyde groups, and adding ortho-aminophenol to perform a reaction at 50-70 DEG C for 2-4 h, filtering the reaction product to obtain a brown precipitate; 2) repeatedly washing the brown precipitate with ethanol, and drying the brown precipitate at room temperature to obtain a dialdehyde cellulose Salen MX ligand; 3) adding a transition metal compound and the dialdehyde cellulose Salen MX ligand to ethanol at the same time, performing a stirring reaction for 12-18 h at 40-70 DEG C under protection by N2, adding anhydrous LiCl, feeding air, and performing stirring reaction for 24-36 h at 30-50 DEG C; 4) filtering the reaction product to obtain a dark-brown precipitate, repeatedly washing the dark-brown precipitate with ethanol and water, and drying the dark-brown precipitate at room temperature to obtain the dialdehyde cellulose Salen MX catalyst. The dialdehyde cellulose Salen MX catalyst has excellent application prospect in the fields of catalyzing epoxidation of natural monoterpenes and copolymerization of epoxy compounds, is simple in preparation method, can be repeatedly used for more than eight times, is prepared with regenerable supporter, is high in yield and selectivity, and has advantages in industrial production of olefin catalytic epoxidation.

The invention belongs to the technical field of preparation of thermoelectric materials and particularly relates to a microwave sintering synthesis method of an oxide thermoelectric material Ca3-xKxCo4O9. The microwave sintering synthesis method comprises the following steps of (1), firstly weighting CaCO3, K2CO3 and Co2O3 according to stoichiometric molar ratio in Ca3-xKxCo4O9, grinding, placing ground powder in a crucible, placing the crucible in a sintering furnace, heating to 820-880 DEG C, pre-sintering for 20-30 hours at a constant temperature, cooling to room temperature in the furnace and taking out; and (2) carrying out second grinding on pre-sintered powder, pressing to sheets, holding the sheets in a double crucible, placing the double crucible in a flattening microwave oven, heating the double crucible for 10-15 minutes at a power of 400-640W, cooling the double crucible to room temperature in the furnace, taking out and pressing into sheets to obtain the target product. The method is simple in operation, the reaction raw materials during the reaction are solid, the chemical components of a reaction product is easy to control, the reaction time is short, the cost is low and the large-scale batch production of the material is facilitated; and the thermoelectric parameter power factor of the product prepared by the method is higher than that of the product prepared by virtue of a high-temperature-furnace sintering method and the thermoelectric performance is more prominent.

The invention relates to the technical field of hydrotalcite material supported catalysts, in particular to an M-Ti hydrotalcite-based closed boron cluster MB x H x The preparation method and application of nano-scale precious metal, the specific steps are as follows: dissolving alkali in water, adding dropwise soluble titanium salt and closed boron cluster MB respectively at the same time x H x The solution was continuously stirred under nitrogen protection until the reaction was complete, and then aged to obtain M-Ti hydrotalcite-based closed boron clusters MB x H x ; M-Ti hydrotalcite-based closed boron cluster MB x H x Disperse in water, add soluble salt of precious metal, stir and react under ultraviolet light irradiation at 20-50°C, filter to obtain precipitate, wash and dry to obtain the M-Ti hydrotalcite-based closed boron cluster MB x H x Nanoscale precious metals. The invention utilizes the reducibility of closed boron clusters, in-situ supports nano-precious metal particles on the surface of hydrotalcite, and the precious metal is wrapped by boron clusters, which is more stable and not easy to fall off.