245results about "Iodine" patented technology

The invention relates to a comprehensive utilization method for bittern, which belongs to the technical field of salt chemical engineering. The bittern is a liquid mineral product, and is rich in multiple elements such as potassium, sodium, lithium, boron, bromine, iodine and the like; and at present, in the prior domestic bittern development and utilization, some simple components or components with high additional value in the elements are extracted, and the un-extracted components are discharged along with old bittern to be abandoned so as to cause serious waste of resources and pollute the environment. Through reasonable combination of processes of removing H2S from the bittern, settling magnesium, settling calcium and preparing calcium carbonate, preparing potassium-sodium mixed saltthrough primary salt preparation and secondary salt preparation, extracting potassium chloride through flotation, extracting boron, iodine, bromine, rubidium and cesium through acidification, preparing rubidium chloride and cesium chloride, extracting lithium and the like, the method implements step-by-step ordered extraction of main components; the toil yield of several main components reaches over 95 percent; and the method has the advantages of mutually exclusive loss in component extraction, implementation of closed cycle of processes, no mother liquor discharge, simple process control, low cost, high yield, environmental protection and the like.

An iodine purification process comprising; a source of fluid; means for delivery of iodine to the source of fluid for use in the purification process; the process further comprising means for recovery of the iodine and/or iodine and/or other iodine species derived from the iodine, from said fluid.

The invention discloses a method for preparing radioactive <124>I ions. The preparation method comprises the following steps: a, taking aluminium oxide powder and tellurium dioxide powder in a mass ratio of 1:18-22, uniformly mixing the powder, and pressing the obtained mixture into a tellurium target with a thickness of 50-60 mg/cm<2>; b, placing the prepared tellurium target in a circular accelerator, and irradiating the tellurium target 2-3 h by Te (p, n) <124>I, wherein the incident p particle beam intensity is 18-20 mu A, the energy is 18.5-20 MeV, and the angle of incidence is 6-10 DEG; meanwhile, cooling the tellurium target by using water in the process of irradiating, and after the irradiating is completed, placing the tellurium target to cool 4-6 h; c, placing the tellurium target in a quartz distillation tube of a destructive distillation device to distill, meanwhile, controlling the temperature to 750 DEG C so as to heat the tellurium target, so that radioactive <124>I ions are escaped, and collecting the radioactive <124>I ions. The problems that radionuclide <124>I prepared in the prior art is low in yield and low in recovery rate are solved.

A method for recycling iodine from production waste liquid of X-CT series contrast agents comprises the following steps: firstly, converting iodine in iodinated organic compounds in organic waste liquid into inorganic iodide; secondly, concentrating, oxidizing the concentrated liquid by using a complex oxidizing agent, oxidizing the iodide anions into elementary iodine, and separating out elementary iodine by filtering; finally, extracting the residual elementary iodine from the filtrate by using an organic solvent so as to completely recycle the low-concentration elementary iodine. The iodine recycling method is applicable to treatment of iodine-containing waste liquid with diverse existing forms of iodine and high iodine content, thus solving the environment pollution problem caused by discharge of the iodine-containing waste liquid in the production process of the X-CT series iodine contrast agents and achieving the recycling of the iodine.

The invention discloses a method for recovering iodine from dilute phosphoric acid in phosphoric acid production with a wet method; iodine is extracted from the dilute phosphoric acid generated in the iodine-containing phosphorus ore production process, wherein, the content of iodine in the dilute phosphoric acid is 50-110mg/L, the concentration of P2O5 in the dilute phosphoric is 25-30%, compound oxidant is added into the phosphoric acid for oxidation reaction, air is used for blowing molecular iodine out, then SO2-containing acidic solution is used for absorbing, the pH value of absorption liquid is between 1-6, then hydrogen peroxide is added to separate iodine out and filtration and separation are carried out to obtain finished iodine. The compound oxidant obtained from the tests conducted by the applicant can improve the efficiency of oxidant and reduce the dosage of oxidant. Proved by the tests performed by the applicant, after the hydrogen peroxide is added with vanadic oxide, the dosage of oxidant can be reduced by 30%; at present, the actual amount of the hydrogen peroxide used for producing 1 ton iodine is 20 tons.

The invention discloses a method for extracting iodine from fluosilicic acid containing the iodine; the method comprises the following steps of: extracting the iodine from the fluosilicic acid solution produced in the production process of the phosphoric acid, wherein, the fluosilicic acid contains 50 to 110 mg/L of the iodine and the total acidity of the fluosilicic acid is 15 percent to 25 percent; adding a compound oxidizing agent into the fluosilicic acid and oxidizing the ion iodine in the solution into molecular iodine; using air to blow out the molecular iodine; absorbing the moleculariodine by using the acid solution containing SO2 with the PH value of the absorbing liquid ranging from 1 to 6; adding hydrogen peroxide and leading the iodine to be precipitated; carrying out filtering and separation and obtaining the finished iodine. The raw material for extracting the iodine by the invention is fluosilicic acid, in which the content of the iodine is usually below 100mg/L. The method and the compound oxidizing agent obtained by the applicant by experiments can carry out extraction to the iodine with low content. The invention expands the selecting range of extracting the material of the iodine.

Systems and methods for the recovery of iodine are described. In particular, recovery systems and methods produce an iodine complex from an aqueous brine containing iodide. A head tank for maintains a supply of the brine, a pH controller acidifies brine received from the head tank and an oxidizer converts iodide in the acidified brine to elemental iodine. At least one activated carbon contactor module is removably inserted into a stream of the oxidized brine provided by the oxidizer and binds the molecular iodine to form the iodine complex. A container may enclose the head tank, the pH controller and the oxidizer in order to facilitate transportation of the system and performance of the methods and processes in proximity to a brine source. The brine may be employed or associated with oilfield operations.

The invention relates to a method for recovering iodine in production waste liquid of X-CT series contrast media. The method comprises the following steps: stewing and refluxing the waste liquid first to recover most of dissociated elementary substance iodine, reducing most of high hypervalent iodine into elementary substance iodine for precipitation; conducting filtration and separation, oxidizing the filtrate to oxidize most of iodine negative ions into elementary substance iodine for precipitation, conducting filtration and separation; and finally conducting active carbon absorption and sublimation and crystallization on filtrate to recover the low-concentration dissociated elementary substance iodine completely. The method for recovering iodine is suitable for treating the iodine-containing waste liquid that has strong acidity, high iodine content and multiple existing forms of iodine, and not only solves the problem that the discharge of iodine-containing waste liquid pollutes environment in the production process of X-CT series contrast media, but also realizes the recovery of iodine as well as the cyclic utilization of production waste liquid.

A method of operating the standard Westinghouse Sulfur Process (2) or the standard Iodine Sulfur Process (4) both having the common initial reaction of H₂SO₄⇄SO₂+H₂O+O.5O₂, where over 760° C. of heat is required for the decomposition, and where the final reaction provides H₂ (6), where all the reactions proceed at an elevated pressure greater than 1100 psi (7.88 MPa) to allow recovery of SO₂ from H₂SO₄ decomposition at temperatures above 4.4° C.

The invention discloses a device for recovering iodine from dilute phosphoric acid in phosphoric acid production with a wet method, comprising a pipeline (1) for leading in the dilute phosphoric acid; the pipeline (1) is connected with an oxidation tank (3), the oxidation tank (3) is connected to a shower (4) above an extracting tower (2) by the pipeline, the lower part of the extracting tower (2) is connected with a blast blower (10), an air outlet (5) of the extracting tower (2) is connected with a packing absorbing column (6), an absorption liquid pipeline (7) of the packing absorbing column (6) is connected with a receiving tank (8) which is connected with an iodine separating tank (9). Proved by a series of industrial tests and researches conducted by the applicant in a phosphorus chemical factory, the device of the invention can realize mass industrial production for extracting iodine, and the device is obtained by optimization through a plurality of tests.

The invention relates to a method for refining industrial crude iodine. The method comprises the steps that the industrial crude iodine with the iodine content accounting for 70 to 95 percent is adopted as material to be added into a sublimator which is provided with concentrated sulfuric acid, a temperature measurement device and a gas blowing-out device; the ambient temperature of a crystallization device is controlled to be 20 DEG C, the sublimator is first heated to 60 to 90 DEG C and the sublimated iodine is caused to flow into a crystallizer by using the gas with the flow rate of 8 to 15L/min; after being maintained for 40 to 60 min, the temperature of the sublimator is heated to 160 to 200 DEG C and the gas-flow rate is adjusted to 1 to 1.5L/min so as to continue to collect the remaining iodine. By adopting the refining method, the content of volatile impurities in iodine products can be effectively reduced; multi-level crystallization devices are adopted to be connected in series to prevent the loss of the iodine and improve the working efficiency of the iodine sublimator. The obtained refined iodine products have neat appearance, large particle size and low impurity content. In addition, the refining method of the invention has the advantages of easy industrialization, low investment, high recovery rate and cleanness without pollution, etc., and can also increase the added value of the iodine products as well as generate relatively high economic and social benefits.

The invention discloses a method for extracting iodine from a dehydrate wet method diluted phosphoric acid reaction iodic waste gas. The method comprises the following steps: (1) collecting an iodic waste gas, and scrubbing in water by using a venturi scrubber and a scrubbing tower; (2) feeding the iodic waste gas subjected to defluorination into an iodine absorbing tower filled with materials, wherein a sealing tank is installed at the lower part of the tower and is filled with water and added with absorbent; (3) pumping the liquid in the sealing tank by using a washing circulation pump into the absorbing tower to be washed in circulation; (4) discharging the washed waste gas into the atmosphere through a fan; (5) after the concentration of the iodine in the liquid in the sealing tank achieves 50g/L, pumping the iodic liquid into an iodine precipitation tank, and adding hydrogen peroxide so as to precipitate the iodine in a crystal mode; and (6) filtering the liquid of iodic crystal, feeding back the liquid into the sealing tank of the absorbing tower, and obtaining 90% of crude iodine in a centrifugal mode. By utilizing the method, the iodine in the dehydrate wet method phosphoric acid reaction waste gas is effectively recycled, so that larger benefits are brought to enterprises, and meanwhile the on-site atmosphere environment is improved with good environmental-protection effect.

Processes for extracting iodine from an aqueous solution, such as brine, are disclosed. Activated coconut carbon particles are mixed with the solution to adsorb iodide through pores in the activated carbon particles. The activated carbon particles are then treated with sulfur dioxide gas and water to form hydrogen iodide. The hydrogen iodide is then reacted with chloride to obtain elemental iodine (I₂).

A method for extracting iodine from blanching waste water of fresh kelp comprises the steps as follows: adjusting the pH value of the blanching waste water, adding an oxidant into the blanching waste water, blowing out the iodine in the blanching waste water by using air, absorbing the iodine in the blown out air by using a solution, analyzing the iodine in the absorption solution, and removing residual oxidant in iodine waste water. The invention overcomes the defects that cannot be overcome in the traditional kelp ion-exchange iodine extraction process through the adoption of the air blowing method, and solves the heating problems in the traditional air blowing method in virtue of the characteristic of high temperature of the blanching waste water of fresh kelp, reduces process cost, realizes economical and efficient extraction of iodine from the blanching waste water of fresh kelp, and achieves the iodine extraction rate above 80 percent. The invention discloses a reduction acidification oxidation method to solve the speed problem of iodine analysis adopting a NaOH solution as an absorption solution and improve quality. Besides, the invention adopts a quantitative reaction method and removes the residual oxidant NaNO2 in the waste water after iodine extraction, thereby solving the problem of environmental pollution caused by the oxidant in the traditional process.

The invention belongs to technology of producing medical radioactive nuclide, and in particular relates to a process for extracting and purifying iodine-131 through a homogeneous aqueous solution nuclear reactor. The process comprises the following steps: adsorbing iodine-131 is from a bulk fuel solution after the reactor operates by an aluminum oxide extraction column or a hydrous zirconium oxide extraction column; and then cleaning the extraction column by using diluted HNO3, H20, NH3.H20; desorbing the iodine-131 on the extraction column by an NH3.H20 or NaOH solution; and finally, separating and purifying the desorbed iodine-131. The yield of the I obtained by the process is more than 50 percent, and purity of the I meets the requirement of a medical NaI solution.

The invention relates to a process and a device for purifying a sulfuric acid phase in the iodine and sulfur cycle under low pressure and belongs to the technical field of hydrogen production of the iodine and sulfur thermochemical cycle. The process for purifying the sulfuric acid phase is carried out under the condition of lower than normal pressure, i.e. under the condition of a purification temperature between 50 and 200 DEG C, a pressure P of a purifying and concentrating tower is controlled in the range that P is more than or equal to 0.01atm and less than 1atm. Compared with the conventional sulfuric acid phase purification process which adopts a nitrogen purging mode under normal pressure, the process has the characteristics of low purification temperature, simple process and low cost and can realize purification and concentration of the sulfuric acid phase in one step so as to effectively improve the purifying efficiency and reduce the purifying and concentrating cost.

The invention provides a method for preparing hydrogen through hydrogen iodide catalysis and decomposition and belongs to the technical field of catalysis reaction .According to the method, molybdenum-based carbide or molybdenum-based nitride is adopted as hydrogen iodide decomposition catalyst, reaction temperature is 350-850 DEG C, and normal pressure is -40 atm .The molybdenum-based carbide comprises pure molybdenum carbide and supported molybdenum carbide .The molybdenum-based nitride comprises pure molybdenum nitride and supported molybdenum nitride .The mass percentage of molybdenum in a supported molybdenum carbide and molybdenum nitride catalyst is 0.5-30% .The method for preparing hydrogen through hydrogen iodide catalysis and decomposition has the advantages of being low in catalyst cost, high in activity and good in stability .Reaction for producing hydrogen through hydrogen iodide catalysis and decomposition can be efficiently and stably conducted through the method.

Methods for treating feline hyperthyroidism comprising (1) administering to a feline an antithyroid agent in conjunction with feeding the feline a composition comprising from about 0.1 to less than about 1 mg/kg iodine or (2) feeding the feline a composition comprising from about 0.1 to less than about 1 mg/kg selenium on a dry matter basis.

The invention discloses a method for extracting iodine from an iodine-containing solution. The method comprises the following steps: adjusting the pH of the iodine-containing solution; adding an oxidant into the iodine-containing solution to be oxidized for certain time and adding an extracting agent into the oxidized solution; heating and stirring for certain time; adding a reverse extraction agent into a loaded organic phase to be subjected to reverse extraction; after the reverse extraction, carrying out water washing treatment on the organic phase; and acidifying a water phase after the reverse extraction to separate crude iodine. According to the method disclosed by the invention, an oxidization-extraction method is adopted so that the method has the advantages of high extraction rate, simple equipment, low energy consumption and the like. The extraction rate of the iodine is more than 93 percent and the extraction agent can be repeatedly used.

The invention discloses a method for recovery iodine from wastewater in medicine production. The method comprises the following steps: acidifying the wastewater in the medicine production with an acid, then reducing inorganic iodine with a reductant, adding a composite oxidant for oxidizing organic iodine, continuously dropwise adding hydrogen peroxide to oxidize iodine negative ions, and simultaneously introducing water vapor to heat and bubble, such that elementary iodine overflows in purple haze; continuously heating till no purple haze overflows, introducing the purple haze to an absorption container, reducing the elementary iodine with a reducible absorption solution, oxidizing the absorption solution with hydrogen peroxide, and filtering and separating to obtain coarse iodine. The acid for acidifying is any one of sulfuric acid, hydrochloric acid or nitric acid; the reductant is one or any two of or a mixture of iron powder, zinc powder, sodium hydrogen sulfite, sodium sulfite or sodium thiosulfate; the composite oxidant is one of C/Fe<2+> or Fe/Fe<3+> in a mixture; the reducible absorption solution is any one of a sulphurous acid solution, a sodium hydrogen sulfite solution or a sodium sulfite solution.

The invention discloses a method for extracting iodine from iodine-containing subsurface brine; the content of iodine in the subsurface brine is 20-30mg/L, compound oxidant is added in the subsurface brine as oxidant for oxidation reaction, air is used for blowing molecular iodine out, then SO2 acidic solution is used for absorbing, the pH value of absorption liquid is between 1-6, then hydrogen peroxide is added to separate iodine out and filtration and separation are carried out to obtain finished iodine. The subsurface brine with iodine content of 20-30 mg/L is usually selected as raw material for extracting iodine; the compound oxidant of the invention can improve the efficiency of oxidant; proved by tests, after the hydrogen peroxide is added with vanadic oxide, the dosage of oxidant can be reduced by 30%. Therefore, the method and the compound oxidant proposed by the applicant after tests can extract the iodine with low content and can expand the select range of the raw materials for extracting iodine.