43results about "Iodine" patented technology

The invention discloses biomass porous carbon material loaded iodine as well as a preparation method and application thereof. The preparation method comprises the following steps: pretreating a biomass material: firstly pickling and then washing to be neutral; the method comprises the following steps: uniformly mixing a biomass material, a pore forming agent, a nitrogen source and water, and pre-carbonizing in a nitrogen or inert gas atmosphere to obtain yellow powder, with the pore forming agent being potassium oxalate and the nitrogen source being melamine; carbonizing the yellow powder at 600-900 DEG C in a nitrogen or inert gas atmosphere, cooling to room temperature to obtain black powder, washing and drying to obtain a biomass porous carbon material; the method comprises the following steps: mixing the biomass porous carbon material and iodine elementary substance, heating in a closed environment to sublimate the iodine elementary substance and absorb iodine by the biomass porous carbon material, cooling to room temperature, preserving heat at 50-65 DEG C in an open environment for at least 12 hours, and cooling to room temperature to obtain the biomass porous carbon material loaded iodine. The battery obtained by loading iodine on the biomass porous carbon material still has good cycle life and relatively high capacity retention rate under high rate.

The invention discloses preparation of a nitrogen-rich ionic organic single crystal material and application of the nitrogen-rich ionic organic single crystal material in iodine adsorption, and belongs to the technical field of functional materials and radioactive pollutant treatment. The material is formed by self-assembly at room temperature through a solution method by taking biphenyl tetracarboxylic acid tetrabutylamine as an anion ligand and tetra (4-ethyl pyridine phenyl) ethylene bromide or tetra (4-imidazole phenyl) ethylene bromide as a cation ligand. The method is simple in preparation process, mild in condition and high in yield. The skeleton of the obtained material is rich in nitrogen sites and has a large cavity, the material shows extremely high adsorption capacity and rapid adsorption kinetics for iodine in a gas phase and a liquid phase, the maximum adsorption capacity of the material for iodine steam reaches up to 5.16 g / g, the retention rate of 95% or above can still be kept within 7 days after adsorption, and the material has good recycling performance. The material provides a novel and reliable solution for efficiently capturing and fixing radioactive iodine, and has a wide application prospect in the field of nuclear waste treatment.

The invention discloses a multi-stage leaching purification method of a targeted therapeutic drug. The multi-stage leaching purification method comprises the following steps: sequentially filling an adsorption column with a porous organic polymer layer and an adsorption ball layer; controlling the flow rate of the leacheate and the column temperature for leaching, and setting an adsorption saturation threshold value; carrier gas is adopted to heat and desorb the porous polymer layer, and carrier gas components are switched to heat and desorb the adsorption ball layer; the method comprises the following steps: introducing carrier gas carrying iodine vapor into an alkaline absorption tower to treat waste gas, eluting impurities of adsorption balls by adopting an acidic mixed solution, and performing catalytic degradation by combining ultraviolet light; a chelating agent solution is used for regenerating adsorption balls, a silver salt solution is used for heavily loading silver ions, an organic solvent is used for eluting and regenerating a porous polymer, regular calibration and part replacement are conducted on a system, and organic pollutants and radionuclides in a matrix are difficult to treat synchronously through a traditional single-layer adsorption material; according to the leaching purification method, the generation amount of radioactive waste liquid is remarkably reduced, and meanwhile the shielding protection requirement of the follow-up purification step is reduced.

The invention discloses multi-adsorption-site nitrogen-doped porous carbon, a preparation method and application in iodine adsorption, and the preparation method comprises the following steps: carrying out primary calcination on a zeolite imidazate framework material, mixing with potassium hydroxide, and then carrying out secondary calcination to obtain the multi-adsorption-site nitrogen-doped porous carbon. According to the invention, a zeolite imidazate framework material is used as a precursor, potassium hydroxide is introduced for high-temperature calcination activation treatment, the obtained product inherits a rhombic dodecahedron framework of ZIF-8, a continuous through pore system and a nitrogen-doped carbon material with high pyrrole nitrogen content are formed, and the static adsorption capacity of the nitrogen-doped carbon material to iodine can reach 7.99 g / g.

The invention belongs to the technical field of iodine removal of light salt brine, and particularly relates to a method for removing high-valence iodine in ionic membrane caustic soda light salt brine. Comprising the following steps: (1) adding a pH regulator and sodium sulfite into light salt brine, regulating the pH to 1-3, stirring until the reaction is completed, and carrying out primary adsorption deiodination by adopting a composite adsorbent to obtain light salt brine 1; and (2) adding a pH regulator and hydrogen peroxide into the light salt brine 1, regulating the pH value to 1-2, stirring until the reaction is completed, and carrying out secondary adsorption by adopting a composite adsorbent to remove iodine, thereby obtaining the deiodinated light salt brine. According to the removal method disclosed by the invention, high-valence iodine such as periodate and iodate in the light salt brine is converted into low-valence iodine such as iodate and iodide ions by utilizing the reducibility of sodium sulfite and the oxidation-reduction property of hydrogen peroxide in the coexistence of iodide ions and iodate, and then is further converted into simple substance iodine, and the simple substance iodine is efficiently removed by utilizing a composite adsorbent; the process is simple, the cost is low, the removal rate is high, and the removal effect is good.

The invention discloses a method for recovering elemental iodine, which comprises the following steps of: performing adsorption-elution treatment on waste gas or waste oil generated in the preparation process of anhydrous lithium iodide, and recovering the elemental iodine from eluent. According to the method, the iodine simple substance escaped by evaporation in the preparation process of lithium iodide trihydrate and the iodine simple substance dissolved in the vacuum pump oil after the lithium iodide trihydrate is subjected to gradient vacuum drying can be efficiently recovered, so that the defects of serious volatilization loss, serious pollution and high occupational risk of the iodine simple substance in the existing preparation process of anhydrous lithium iodide are overcome; the efficient recovery of iodine resources is realized, the production cost is reduced, and meanwhile, the pollution to the environment and the harm to people are reduced.

To provide a method for producing iodine that can efficiently remove nonvolatile substances using a simple method and efficiently produce high-quality iodine with low levels of nonvolatile substances, and to provide an iodine production apparatus that can efficiently remove nonvolatile substances with a simple configuration and efficiently produce high-quality iodine with low levels of nonvolatile substances. [Solution] The present invention provides a method for producing iodine, comprising: an iodine raw material preparation step of preparing an iodine raw material solution containing iodide ions; a crystallization step of oxidizing the iodide ions in the iodine raw material solution to precipitate iodine and obtain slurry iodine; a separation step of separating the slurry iodine into a liquid portion and a solid portion; a water addition step of adding water so as to come into contact with the solid portion; and a melting step of heating the solid portion to melt the iodine and obtain molten iodine, and separating the molten iodine from the water.

The invention discloses a method for recovering elemental iodine from perfluoroalkyl iodide, which comprises the following steps: (1) mixing perfluoroalkyl iodide and an alkaline solution to form a reaction solution, and heating and stirring to form a deiodinated solution; (2) adjusting the pH value of the deiodinated solution to 6-7 by using an acidic solution, and distilling to obtain an inorganic iodized salt solid; and (3) adding water to dissolve the inorganic iodized salt solid to obtain an inorganic iodized salt solution, adding an acidic solution to maintain the pH value to be strongly acidic, adding an oxidizing agent to carry out an oxidation-reduction reaction, filtering and separating to obtain wet iodine, and drying and dehydrating to obtain the iodine simple substance. The method is used for treating perfluoroiodo alkane which is high in iodine content and difficult to treat, an alkaline solution is adopted for reacting with perfluoroiodo alkane for deiodination, the deiodination solution is subjected to acidification and oxidation reaction to prepare high-purity iodine simple substance, and the iodine simple substance can be directly used as a product to be applied to production of iodine-containing compounds.

The present invention relates to a method for obtaining iodide ions from a solution comprising a small amount of an iodine-containing aromatic compound, such as a non-ionic X-ray contrast agent, the method comprising the steps of: contacting the solution comprising a small amount of an iodine-containing aromatic compound with activated carbon, thereby adsorbing the iodine-containing aromatic compound contained therein onto the activated carbon; and deiodinating the iodine-containing aromatic compound adsorbed onto the activated carbon.

The invention provides an iodine-carbon composite material and a preparation method thereof, and relates to the technical field of composite material preparation, the preparation method of the iodine-carbon composite material comprises the following steps: taking conidium powder to prepare fixed conidium powder, adding the fixed conidium powder into sulfuric acid for reaction, then washing, neutralizing, and freeze-drying to obtain pretreated conidium powder; the pretreated conidium powder is firstly heated and then carbonized to prepare carbonized porous conidium powder, an iodine solution is prepared, the carbonized porous conidium powder is added into the iodine solution and stirred to be uniform, then deionized water is added, and the iodine-carbon composite material is obtained through filtering and drying. The iodine-carbon composite material can inhibit generation of dead lithium and activate existing dead lithium.

The invention relates to a wet trapping process and equipment for iodine-containing tail gas. The wet trapping process comprises the following steps: S1) introducing an absorption liquid into an iodine trapping tower and spraying downwards from the top; s2) introducing the iodine-containing tail gas into the bottom of the iodine trapping tower, so that the tail gas is in countercurrent contact with the spraying absorption liquid in the tower from bottom to top, and carrying out absorption reaction; wherein the absorption liquid contains urea and sodium hydroxide, and the iodine-containing tail gas contains gaseous iodine elementary substance and methyl iodide. Through the synergistic effect of a specific absorption liquid formula and optimized operation parameters, synergistic and efficient removal of elemental iodine and organic iodine is achieved, the efficiency can reach 99% or above, operation is stable and reliable, and the method is suitable for treatment of iodine-containing radioactive waste gas of a nuclear fuel reprocessing plant.

The application discloses a kind of coupling membrane separation and pressure swing adsorption's sulfur-iodine cycle hydrogen purification method and device.The method comprises: the decomposition product gas from hydrogen iodide decomposition unit enters preliminary treatment unit and is condensed to remove water, to realize preliminary separation;After preliminary separation, mixed gas enters membrane separation equipment, and membrane separation equipment is based on molecular size rejection mechanism to realize the preliminary separation between hydrogen and other impurities, and hydrogen in mixed gas enters the permeation side through membrane material, to form the preliminary purification hydrogen-rich gas stream;Hydrogen-rich gas stream enters PSA purification device, and PSA purification device uses gradient adsorbent bed to purify hydrogen-rich gas stream, to obtain high-purity hydrogen.The application solves the problem of low purity and low yield in sulfur-iodine cycle hydrogen purification, and provides an efficient purification scheme for sulfur-iodine cycle and other thermochemical hydrogen production technologies.

This invention discloses a method for iodine recovery and reuse during the preparation of tetrachlorohexafluorobutane, comprising the following steps: S1, preparing trifluorodichloroiodoethane using refined iodine and trifluorochloroethylene as raw materials, and preparing a tetrachlorohexafluorobutane reaction solution using trifluorodichloroiodoethane as raw material; S2, adding water to the tetrachlorohexafluorobutane reaction solution to obtain a soluble solution, oxidizing, filtering, and refining the aqueous phase to obtain refined iodine, and distilling the organic phase to obtain refined tetrachlorohexafluorobutane, an organic solvent containing iodine and zinc iodide, and an organic iodide; S3, washing the organic solvent containing iodine and zinc iodide with an absorbent to obtain an iodide ion aqueous solution, which is then oxidized, filtered, and refined to obtain refined iodine; the organic iodide is catalytically chlorinated to obtain iodine chloride, which is used to prepare trifluorodichloroiodoethane. The entire process of this invention is rapid, environmentally friendly, and has a high iodine recovery rate, making it suitable for large-scale industrial production.

The invention relates to a comprehensive recovery method for gold, iodine and isopropanol in a KI gold etching solution. The method comprises the steps of gold recovery, precipitation for iodine removal, pH adjustment, salting-out, standing for layering and liquid separation treatment. According to the method, the used KI gold etching liquid is subjected to gold recovery and iodine removal treatment to obtain primarily purified liquid, so that main interference components in the KI gold etching liquid are effectively removed, and conditions are created for subsequent recovery of isopropanol. The method comprises the following steps: adding isopropanol into a salting-out agent, then weakening the interaction between the isopropanol and water by utilizing the stronger interaction between the salting-out agent and water molecules so as to reduce the solubility of the isopropanol in the water, and then carrying out standing layering and liquid separation treatment to separate the isopropanol. And through comprehensive recovery of gold, iodine and isopropanol, the resource utilization rate is increased, and the production cost of enterprises is reduced.

The application discloses a method and system for recovering iodine from wastewater containing organic iodide, and the method comprises three steps of biochemical treatment, oxidation adsorption and desorption to recover elemental iodine or coarse iodine from the wastewater containing organic iodide. The iodine recovery of industrialized wastewater with large flow is realized by using a continuous flow reactor.

This invention belongs to the field of waste resource utilization technology, specifically relating to a method for the resource utilization of saline organic waste. The invention uses saline organic waste and non-salt organic waste liquid as raw materials to prepare a high-concentration inorganic salt mixture. This high-concentration inorganic salt mixture is then vaporized and subjected to quenching water cooling, causing the organic matter to generate syngas, which is then used to produce various chemical products for efficient utilization. Simultaneously, the inorganic salts are introduced into the aqueous phase and subsequently recovered through vacuum distillation and crystallization. Furthermore, when the saline organic waste also contains bromine and / or iodine, the invention further includes the extraction of the halogen-containing mother liquor obtained after crystallization to recover elemental bromine and / or iodine. Through the combination of various process steps, this invention can recover inorganic salts while preparing syngas, achieving the harmless disposal and high-value resource utilization of saline organic waste, with a comprehensive resource utilization rate exceeding 95%.

The application discloses a benzyl triethyl eutectic solvent, a preparation method thereof and application of the benzyl triethyl eutectic solvent in extraction of iodine. The benzyl triethyl eutectic solvent is placed in an organic solvent solution containing iodine, and iodine is extracted under constant temperature and stirring. The benzyl triethyl eutectic solvent prepared by the application has strong trapping capacity for iodine; meanwhile, the benzyl triethyl eutectic solvent has the advantages of simple synthesis, low price and the like.

A method of removing water from a mixture of iodine (I2) and water includes providing a mixture comprising iodine and water and: contacting the mixture with an adsorbent to selectively adsorb water from the mixture, contacting the mixture with a concentrated acid to absorb water from the mixture, separating the water from mixture by distillation, contacting the mixture with a gas that is inert to iodine (I2), contacting the mixture with hydrogen iodide (HI), or combinations thereof.

To provide a method for producing iodine that can reduce the concentration of iodine components in wastewater generated during the production of iodine. [Solution] The method for producing iodine of the present invention includes the steps of mixing a first solution with a first oxidant solution to obtain a second solution, reducing the iodine separated from the second solution to obtain a third solution, mixing a solution containing residues of the second solution with the second oxidant solution to obtain a fourth solution, reducing the iodine separated from the fourth solution to obtain a fifth solution, and mixing the third solution, the fifth solution, and an oxidant to obtain a solution containing iodine, and crystallizing and separating iodine from the iodine-containing solution to obtain iodine, wherein the concentration of the oxidant contained in the first oxidant solution relative to the total amount of the first solution and the first oxidant solution is 3.00 mmol / L or less, and the concentration of iodine ions contained in the first solution relative to the total amount of the first solution and the first oxidant solution is 4.80 mmol / L or less.

The invention relates to the technical field of electric propulsion tests, and provides an iodine vapor collecting device which comprises a refrigeration cabinet, a heat transfer medium and a collecting pipeline. The refrigeration cabinet comprises a bottom box and a cover plate, the cover plate covers the bottom box, the heat transfer medium is arranged in the bottom box, and the bottom box has a refrigeration function so that the heat transfer medium can be maintained in a low-temperature state in which iodine vapor can be condensed; the collecting pipeline is of a U-shaped structure. The refrigeration cabinet and the heat transfer medium are used for providing a low-temperature environment for the collection pipeline where the iodine vapor is located, iodine vapor desublimation collection is achieved, and the device is simple, easy to achieve, convenient to assemble and disassemble, capable of rapidly providing the low-temperature environment and capable of achieving adjustment of the environment temperature; the iodine vapor is collected, so that emission of harmful gas and environmental pollution are avoided, and the iodine working medium electric thruster ground test device has wide applicability and can promote development of an iodine working medium electric thruster ground test.

This method produces water containing free iodine, which can be used to suppress slime and fouling, without the use of an oxidizing agent. [Solution] By irradiating water containing iodide, such as an aqueous potassium iodide solution (iodide-containing water), with ultrasonic waves using an ultrasonic transducer 31, free iodine is generated in the iodide-containing water.

Novel methods of preparing nano-starch or nano-starch / ester suspensions are disclosed in this application. The obtained nano-starch suspensions and nano-starch / ester suspensions showed unexpectedly high stabilities and can be iodinated using various iodine solutions to provide iodinated nano-starch suspensions and nano-starch / ester suspensions that have long-term stabilities and improved stabilities under basic conditions. New products can be prepared using the nano-starch suspensions, nano-starch / ester suspensions, iodinated nano-starch suspensions, and / or nano-starch / ester suspensions and used for applications as disclosed herein.

Novel methods of preparing nano-starch or nano-starch / ester suspensions are disclosed in this application. The obtained nano-starch suspensions and nano-starch / ester suspensions showed unexpectedly high stabilities and can be iodinated using various iodine solutions to provide iodinated nano-starch suspensions and nano-starch / ester suspensions that have long-term stabilities and improved stabilities under basic conditions. New products can be prepared using the nano-starch suspensions, nano-starch / ester suspensions, iodinated nano-starch suspensions, and / or nano-starch / ester suspensions and used for applications as disclosed herein.

The present invention relates to a method for recovering iodine from a solution of phosphoric acid, the method comprising the following steps: a) providing a solution of phosphoric acid comprising dissolved iodine, the concentration of iodine in the solution being at least 30 ppm; b) oxidizing the solution of phosphoric acid so as to convert the dissolved iodine into volatile iodine; c) blowing air to carry the volatile iodine from the oxidized solution resulting from step b) into an absorption column; d) in the absorption column, absorbing the volatile iodine in a solution comprising an absorbent; e) concentrating the solution resulting from step d) via reverse osmosis, liquid-liquid extraction or chemical precipitation; f) precipitating and recovering crystals of diiodine or an iodine salt.

Iodine is produced without using waste brine. The method for producing iodine of the present invention involves mixing a diluted solution of an oxidizing agent with dilution water (excluding waste brine) with natural brine, thereby oxidizing the iodide ions contained in the natural brine and liberating iodine. Sodium hypochlorite can be used as the oxidizing agent.

The invention relates to the technical field of electric propulsion tests, and provides an iodine gas collecting and removing device and method.The iodine gas collecting and removing device comprises a collecting pipeline, a front valve, a rear valve and a cooling structure; the collecting pipeline is of a tubular structure, the cooling structure is arranged in the collecting pipeline in the circumferential direction of the collecting pipeline or arranged in the collecting pipeline, and the front valve and the rear valve are arranged at the front end and the rear end of the collecting pipeline respectively. And the collecting pipeline is provided with a degassing port. The cavity is formed in the outer wall or the interior of the collection pipeline, the pipeline is cooled, the collection pipeline is heated through the additional heating mechanism, and the valve and the waste gas collection mechanism are supplemented, so that the collection and removal functions of the iodine gas in the collection pipeline are realized, the iodine adsorption and removal method of the iodine gas collection device is simplified, and the collection efficiency is improved. And emission of harmful gas is avoided, and wide applicability is achieved.

The invention discloses a process method for multi-stage oxidation recovery of iodine from various iodine-rich evaporation mother liquor and other iodine-rich waste liquid, and relates to the technical field of industrial waste liquid resource utilization, the method comprises the steps of raw material pretreatment, gradient cooling crystallization, solid-liquid separation, first-stage oxidation precipitation, second-stage oxidation precipitation and iodine product treatment, through gradient cooling crystallization, the mother liquor is cooled to 20 DEG C through a precooler and a cooler, and potassium chloride and sodium chloride are separated out for desalination; adjusting the pH value of the desalted clear liquid to 2.0, carrying out two-stage oxidation precipitation by adopting hydrogen peroxide, recovering main iodine in the first stage, and strengthening residual iodine recovery in the second stage; according to the present invention, the problems of low recovery efficiency and insufficient purity of the low concentration iodine in the high salt environment are solved, the efficient resource utilization is achieved, the reuse water utilization rate is more than or equal to 85%, and the method is suitable for the resource recovery of the iodine in the industrial waste liquid.

The invention discloses a comprehensive utilization method of sintering machine head ash, which comprises the following steps: S1, leaching the sintering machine head ash by using water and / or a carbonic acid solution as a leaching agent, and sequentially filtering and removing impurities to obtain a leachate containing potassium, sodium, rubidium, cesium, bromine, iodine, lithium and boron elements; s2, bromine and iodine are separated and extracted from the leachate for recovery, and first separation raffinate is obtained; s3, rubidium and cesium are separated and extracted from the first separation raffinate for recovery, and second separation raffinate is obtained; s4, lithium and boron are separated and extracted from the second separation raffinate for recovery, and third separation raffinate is obtained; and S5, recovering a sodium chloride product and a potassium chloride product from the third separation raffinate by adopting an evaporative crystallization process and / or a flotation process. According to the scheme, the comprehensive utilization rate of the sintering machine head ash is remarkably increased, the additional value of the sintering machine head ash is improved, and the problems of pollution and waste of the sintering machine head ash are effectively solved.

The present invention relates to a process for recovering iodine from a phosphoric acid solution comprising the following steps: supplying a phosphoric acid solution containing dissolved iodine, the iodine concentration in the solution being at least 30 ppm; oxidizing the phosphoric acid solution so as to convert the dissolved iodine into volatile iodine; entraining the volatile iodine from the oxidized solution resulting from step b) by blowing air into an absorption column; in the absorption column, absorbing the volatile iodine into a solution comprising an absorbent; concentrating the solution from step d) by reverse osmosis; and precipitating and recovering iodine crystals or an iodine salt. Figure for the abstract: Fig. 1

The invention discloses a material treatment method for radiopharmaceutical preparation. The material treatment method comprises the following steps: dissolving an irradiated tellurium dioxide target material in a sodium hydroxide solution to generate a sodium tellurite solution; adding hydrogen peroxide and a composite-phase molybdenum carbide catalyst into the solution, and adjusting the pH to an acidic condition to promote the tellurite radical to be preferentially converted into a high-valence tellurium compound; the method comprises the following steps: cooling I-containing iodine vapor through nitrogen-assisted distillation, and introducing the cooled I-containing iodine vapor into an alkaline NaOH solution for capturing; a composite-phase molybdenum carbide catalyst is adopted, the ratio of alpha-MoC to beta-MoC is regulated and controlled, and TiO deposition modification on the surface of beta-MoC is combined, so that the activity, stability and selectivity of the catalyst are remarkably improved; experiments show that the method enables the yield of iodine-131 to reach 92.76%, the purity to reach 99.65% and the content of by-products to be reduced to 0.12%; the contrast experiment further verifies the influence of the catalyst dosage, the phase composition and the distillation condition on the result, and verifies that efficient and high-purity iodine-131 preparation is realized through the catalytic synergistic effect and the surface functionalization design.