77results 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 present invention discloses a preparation method of a carbon-rich coal gasification slag-based iodine-doped C / SiO x composite lithium battery anode material, belonging to the field of lithium battery anode materials; First, the present invention uses a nitric acid solution to pretreat the carbon-rich coal gasification slag to remove metal impurities and obtain a solid residue; Then, the pore channels of the solid residue are modified and reformed by chemical activation to prepare a porous C / SiO x composite material; Finally, iodine (I2) is deposited on the surface and inner pore walls of the porous C / SiO x composite material by fumigation to finally obtain the anode material.

The invention provides a step-by-step extraction process for potassium-rich multi-component brine, which sequentially comprises the following steps of: performing negative-pressure desulfurization on the brine to produce an alkali sulfide product; a boric acid product is produced through boron extraction by an adsorption method; magnesium hydroxide and calcium sulfate products are produced through a lime method reaction; a sodium chloride product is produced through I-stage evaporative crystallization; a calcium carbonate product is produced through a sodium carbonate method; the method comprises the following steps of: producing a lithium carbonate product by adsorbing and extracting lithium, producing iodine and bromine products by oxidizing and blowing iodine and bromine, producing a cesium nitrate product by adsorbing and extracting cesium, producing rubidium nitrate by adsorbing and extracting rubidium, and preparing sodium chloride and potassium chloride products by evaporating and concentrating at the section II. And the product quality is high, the element yield is high, the production cost is low, the operation is simple, the post labor intensity is small, the closed cycle is realized in the extraction process, the emission of three wastes is avoided, and the green and environment-friendly production is realized.

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 present invention provides a method for recovering iodine and boric acid from iodine-containing waste liquid. The method includes: subjecting the iodine-containing waste liquid to primary acidification after pretreatment, followed by solid-liquid separation to obtain boric acid and iodine-containing solution; sequentially performing secondary acidification and oxidation on the iodine-containing solution to obtain a solid-liquid mixture containing iodine and boric acid; adjusting the pH value of the solid-liquid mixture with alkali and then performing solid-liquid separation to obtain iodine and a salt-containing solution; subjecting the iodine vapor generated during the reaction to condensation and spray absorption in sequence, and returning the condensed iodine for co-recovery. The method of the present invention first precipitates boric acid through acidification treatment according to the composition of the iodine-containing waste liquid, recovers the boric acid product, and then obtains a high-purity iodine product through further acidification and oxidation reactions; the present invention condenses and spray-absorbs the iodine vapor to avoid iodine loss and possible environmental pollution, and ensures the iodine recovery rate; the method is simple to operate, has mild conditions, low cost, and realizes the resource utilization of the waste liquid.

To provide a method for producing an iodine component-containing aqueous solution which can maintain iodine ion concentration while reducing fluoride ion concentration and / or phosphate ion concentration in non-treatment water by a coagulation method.SOLUTION: A method for producing an iodine component-containing aqueous solution includes: a coagulation step of bringing non-treatment water containing iodine ions, fluoride ions and / or phosphate ions into contact with an inorganic coagulant which more selectively reacts with the fluoride ions and / or the phosphate ions than the iodine ions, and obtaining an aggregate obtained by reacting the fluoride ions and / or the phosphate ions with the inorganic coagulant; and a separation step of removing the aggregate from the non-treatment water, and causing the iodine ions to remain in the non-treatment water and thereby obtaining treatment water.SELECTED DRAWING: Figure 1

The invention provides a radioactive elemental iodine synthesis and feeding system which comprises a radioactive elemental iodine synthesis unit, a dilution unit, a detection unit and an iodine adsorption test unit, the radioactive elemental iodine synthesis unit is used for synthesizing radioactive elemental iodine; the dilution unit is used for providing dilution gas for the synthesized radioactive elemental iodine and diluting the radioactive elemental iodine synthesized by the radioactive elemental iodine synthesis unit; the detection unit is arranged in front of the iodine adsorption test unit and is used for detecting parameters of test airflow entering the iodine adsorption test unit; and the iodine adsorption test unit is used for adsorbing the test airflow containing the radioactive elemental iodine and carrying out an iodine adsorption test. The invention also provides a synthesis and feeding method of the radioactive elemental iodine.

Methods of recovering iodine (I2) from a stream including iodine (I2) vapor and at least one of: an inert gas and water vapor can include contacting the stream with an alkaline solution to form an iodide salt, contacting the stream with an adsorbent to selectively adsorb water from the stream, contacting the stream with a concentrated acid to absorb the water vapor from the stream, desublimating or condensing the iodine (I2) vapor to form solid or liquid iodine (I2), or contacting the stream with a material to condense or de-sublimate the iodine (I2) vapor from the stream as the material at least one of: absorbs latent heat through a phase change of the material and absorbs sensible heat.

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 refers to a process for obtaining iodide from solution comprising low amounts of iodine-containing aromatic compound, such as of non-ionic X-ray contrast agents, comprising the steps of contacting the solution comprising low amounts of iodine-containing aromatic compound with activated carbon to adsorb the iodine-containing aromatic compound comprised therein onto the activated carbon; and de-iodinating the iodine-containing aromatic compounds 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.

To provide a method for eluting iodine, which can more efficiently elute iodine. [Solution] A method for eluting iodine from iodine-adsorbed activated carbon obtained by adsorbing iodine to activated carbon, the method comprising an iodine elution step of contacting the iodine-adsorbed activated carbon with an eluent having a pH of 13 or higher to elute iodine from the iodine-adsorbed activated carbon, the iodine elution step being carried out at 0 to 40°C.

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 invention discloses equipment for extracting crude iodine from brine evaporation mother liquor, and relates to the technical field of crude iodine extraction.The equipment comprises a feeding system used for introducing the brine evaporation mother liquor; the oxidation reaction unit is used for generating the optimal oxidant dosage through linkage analysis; the feedback control algorithm module is used for feeding back; the reaction tower is used for enhancing the gas-liquid reaction contact efficiency of the mother liquor and the oxidizing agent; the evaporation unit is used for heating to volatilize the iodine simple substance generated by oxidation to form iodine vapor; and the condensation and collection unit is used for cooling and recycling the iodine vapor to form crude iodine crystals. The method solves the technical problems of low crude iodine extraction rate and resource waste and environmental pollution caused by direct discharge of the mother liquor in the prior art, and achieves the technical effects of efficiently extracting the crude iodine in the brine evaporation mother liquor, improving the resource utilization rate and reducing the environmental pollution.

The invention belongs to the technical field of comprehensive utilization of brine resources, and particularly relates to a brine iodine extraction system and process method based on an ozone oxidation and air blow-out method. The brine iodine extraction system comprises a brine pretreatment unit, an acidification and ozone oxidation unit, a multi-stage air stripping unit, an absorption and recycling unit and a tail gas purification unit, the multi-stage stripping unit comprises N stages of stripping towers which are connected in series stage by stage, each stage of stripping tower from the first-stage stripping tower to the N-stage stripping tower adopts a strategy of ozone segmented addition and temperature gradient regulation and control, and the gas-liquid ratio from the first-stage stripping tower to the N-stage stripping tower is reduced stage by stage in each stage of stripping tower; the absorption and recycling unit comprises a multi-stage absorption unit and an absorbent regeneration unit, the multi-stage absorption unit comprises M stages of absorption towers which are connected in series stage by stage, and the absorbent regeneration unit comprises an electrolytic regeneration system. The method is suitable for high-salt and low-iodine brine, is particularly suitable for industrial iodine extraction scenes of low-iodine-concentration and high-salinity brine, and integrates high efficiency, environmental protection property and economical efficiency.

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 discloses a preparation method of a carbon-rich coal gasification slag-based iodine-doped C / SiOx composite lithium battery negative electrode material, and belongs to the field of lithium battery negative electrode materials. The method comprises the following steps: firstly, pretreating the carbon-rich coal gasification slag by adopting a nitric acid solution, and removing metal impurities to obtain solid residues; then, modifying and reforming pore channels of the solid residues through chemical activation to prepare a porous C / SiOx composite material; and finally, depositing I2 on the surface and the inner walls of pores of the porous C / SiOx composite material by a fumigation method to finally prepare the negative electrode material.