38results about "Iodide preparation" patented technology

The invention discloses a preparation method of stable lead-free all-inorganic double perovskite A2BB'X6 nanocrystals. The method adopts a thermal injection technology to synthesize the nanocrystals,and concretely comprises the following steps: mixing a metal precursor salt, a reaction solvent oleic acid, oleylamine, octadecene and other raw materials, carrying out vacuum heating and stirring ata certain temperature for a certain period of time, rising the temperature to a suitable reaction temperature under the protection of N2, rapidly injecting the obtained hot oleate solution of A into areaction system, and then rapidly cooling the system to room temperature by using ice bath to finally obtain the A2BB'X6 perovskite nanocrystals having a uniform size. The method has the advantages of simplicity, convenient, good reappearance and environmental protection, and the obtained product has the advantages of uniform size, good dispersion, high stability and excellent photocatalytic performance, and can be applied to the fields of photocatalysis, photodetectors, laser, solar cells and the like.

Crystalline scintillator materials comprising nano-scale particles of metal halides are provided. The nano-scale particles are less than 100 nm in size. Methods are provided for preparing the particles. In these methods, ionic liquids are used in place of water to allow precipitation of the final product. In one method, the metal precursors and halide salts are dissolved in separate ionic liquids to form solutions, which are then combined to form the nano-crystalline end product. In the other methods, micro-emulsions are formed using ionic liquids to control particle size.

The present invention relates to the preparation process of nanometer silver iodide powder. Clear silver sulfate water solution containing silver nitrate in 0.1-0.4 M/L and complexing agent in 0.034-0.2 M/L is dropped slowly into clear potassium iodide water solution containing potassium iodide in 0.1-0.4 M/L, complexing agent in 0.034-0.2 M/L and dispersant in 0.01-0.04 M/L at normal temperature and normal pressure via stirring, and the product is let stand to deposit to obtain nanometer silver iodide deposit. The nanometer silver iodide deposit is filtered, washed and dried at 80-100 deg.c for 1-2.5 hr to obtain nanometer silver iodide powder with granularity below 100 nm. The process is easy to control, pollution-free and suitable for industrial production, and the product has high quality and low cost.

Scintillator material comprising nanoparticles (nanocrystals) comprising lead (Pb), iodine (I), and optionally one or both of oxygen (O) and hydrogen (H) wherein the nanoparticles exhibit room-temperature scintillation under gamma irradiation. The scintillator nanoparticles can comprise Pb₃O₂I₂. The scintillator nanoparticles can comprise PbIOH in generally equiatomic proportions or non-equiatomic variants thereof that exhibit scintillation under gamma irradiation. The scintillator nanoparticles have a particle dimension in the range of about 5 to about 100 nm. Microparticles (microcrystals) also are provided comprising lead (Pb), iodine (I), and optionally one or both of oxygen (O) and hydrogen (H) grown in a nanoparticle colloidal solution over time to a particle dimension greater than 0.1 μm, such as about 2 microns.

The invention relates to a method for the preparation of nanoparticles in ionic liquids. Specifically, the invention relates to a simple, quick and effective method for the preparation of dispersions of nanoparticles (nanofluids) in an ionic liquid.

A system (100) of the present invention for producing an iodine compound includes: a raw material adjusting unit (1) for supplying hydrogen-containing gas to at least one of liquid iodine in an iodine melting pot (4) and gaseous iodine obtained by evaporating liquid iodine so as to obtain a mixture gas; a hydrogen iodide producing unit (10) including a hydrogen iodide producing tower (12) having a catalyst layer (12a) for converting the introduced mixture gas into crude hydrogen iodide gas; a hydrogen iodide refining unit for removing unreacted iodine from the introduced crude hydrogen iodide gas so as to obtain hydrogen iodide gas; and an iodine compound producing unit (30) for producing a target iodine compound from the obtained hydrogen iodide gas and a reaction material. This allows producing an iodine compound with high purity easily, efficiently, and with low cost.

The invention discloses a method for preparing iodized salt from iodine-contained absorption solution, which comprises the following operation steps of: reducing a free iodine elementary substance in the iodine-contained absorption solution into an iodide ion with a reducing agent, adding an appropriate amount of barium carbonate to convert a sulfate ion in a solution system into barium sulfate and adding alkali or salt being capable of reacting with hydroiodic acid into a filtrate after filtration to obtain required iodized salt solution; and obtaining the corresponding iodized salt in concentration and crystallization manners. The method has the beneficial effects that the complicated process of preparing the iodized salt by utilizing iodine is avoided, the process flow is shortened, and meanwhile, a large quantity of energy sources can be saved; intermediate body hydroiodic acid is taken as a raw material to prepare the iodized salt by utilizing an iodine recovery process, the raw material is easily obtained, and obtained mother liquid after concentration and crystallization can be directly returned to an iodine recovery device, so that the sources are reasonably recycled; and the preparation process of the iodized salt is simple, and products after concentration and crystallization have good quality and high product yield.

To provide a method for recovering an inorganic iodide, by which the inorganic iodide can be easily recovered in a high concentration from a mixed inorganic salt aqueous solution containing the inorganic iodide without necessitating specific equipment, and to obtain an objective substance at a low cost by recycling the recovered inorganic iodide in an iodine ion-removing reaction.

The invention relates to synthesis of a bismuth iodine hybrid material and application to preparation of a BiOI nano-sheet, and aims to synthesize the bismuth iodine hybrid material, wherein the bismuth iodine hybrid material can be directly applied to hydrolysis to prepare the BiOI nano-sheet. A bismuth iodine based hybrid (Habtz)BiI4 is prepared by taking bismuth iodide and 2-aminobenzothiazoleas reaction raw materials and taking mixed liquid of ethanol and hydroiodic acid as a reactant and a solvent and under the solvothermal condition, wherein the abtz is 2-aminobenzothiazole. The bismuthiodine hybrid material is simple to prepare, the raw materials are low in price and the yield is high. The hybrid material serving as a precursor can be hydrolyzed rapidly without adding other reaction raw materials in distilled water and without adjusting the pH value of the reaction, so that simple and efficient preparation of the BiOI nano-sheet is realized.

The invention provides a vertical type Na131I dry distillation production device which comprises a dry distillation device, an absorption tower, a purifier, a vacuum pump and a controller, wherein the dry distillation device is fixedly connected with the absorption tower; the dry distillation device is further sequentially connected with the absorption tower, the purifier and the vacuum pump through a pipeline; and the dry distillation device and the vacuum pump are electrically connected with the controller respectively. The production device provided by the invention can produce medical-grade Na131I products from TeO2 raw materials irradiated by a reactor, and an uncovered target drum (e.g. zirconium alloy target drum) can be directly put into a quartz crucible for distillation, thus greatly improving the single production capacity and raw material utilization ratio, and reducing the radioactive solid waste content and contamination risk. The production device provided by the invention has a compact structure, is suitable for Na131I dry distillation production in a shielded working box with small effective operating space, and has favorable operation stability and safety.

The present invention relates to a P-type high-performance thermoelectric material featuring reversible phase change, and a preparation method therefor. The thermoelectric material has a chemical composition of Cu₂Se_1-xI_x, wherein 0<x≦0.08. The method comprises: weighing elemental copper metal, elemental selenium metal, and cuprous iodide according to the molar ratio (2−x):(1−x):x, and packaging them in a vacuum; raising the temperature to 1150-1170° C. in stages and performing a melting treatment for 12-24 hours; lowering the temperature to 600-700° C. in stages and then performing an annealing treatment for 5-7 days, the substances being cooled to room temperature in a furnace after the annealing treatment; and performing pressure sintering at 400-500° C.

The invention provides a method for preparation of rhodium triiodide, which contains: using trivalent rhodium hydroxide and hydriodic acid as reactive raw material, adding proper hydriodic acid solution of certain concentration into said trivalent rhodium hydroxide, heating up to 60-100Deg. C and mixing, keeping for 2-6 hours, and filtering, washing and drying to prepare product. The prepared rhodium triiodide is cinereous and porous, and it is easy to wash and filter; the rhodium content in the product is about 19.5-21.5%, and the impurity is almost negligible; and the product is especially suitable to be a catalyst for synthesis of acetic acid by carbonylation of methanol.

The invention provides a production method for powder-like alkali metal iodide or alkaline earth iodide in industry. An alkali metal iodide solution, an alkaline earth iodide solution, an alkali metal iodide turbid liquid or an alkaline earth iodide turbid liquid are prepared by solving the alkali metal iodide or alkaline earth iodide or suspending the alkali metal iodide or alkaline earth iodide in a solvent, and the alkali metal iodide or alkaline earth iodide are smashed while removing the solvent of the solution or the turbid liquid.

The invention provides a vertical type Na131I dry distillation production device which comprises a motor, a sliding chute, a distillation furnace, an iodine catcher and a controller, wherein the motor is fixedly connected with the sliding chute; the sliding chute is slidably connected with the distillation furnace; the distillation furnace is connected with the iodine catcher through a pipeline; and the controller is electrically connected with the motor, the distillation furnace and the iodine catcher respectively. The vertical type Na131I dry distillation production device provided by the invention can be used for producing the medical-grade Na131I from activated TeO2, and can be used for directly placing an uncapped target barrel into a ceramic crucible for distillation, thus obviously enhancing the unit yield of the device and the utilization rate of a raw material and reducing the risk of radioactive pollution and the output of a radioactive solid waste. The vertical type Na131I dry distillation production device provided by the invention is compact in structure, can be suitable for Na131I dry distillation production inside a shielding work box with a small effective operation space and has good stability, convenience and safety in operation.