44 results about "Perrhenic acid" patented technology

The invention discloses a preparation method of high purity ammonium rhenate, the method comprises the following steps of S1, dissolving ammonium rhenate in pure water to obtain an ammonium rhenate solution and adjusting pH value to 7 to 10, then performing oxidation and precipitation in sequence, and centrifuging to obtain an ammonium rhenate solution without containing TI; S2, after performing concentration and crystallization on the ammonium rhenate solution without containing TI, performing oxidation volatilization to obtain a perrhenic acid solution; S3, exchanging the perrhenic acid solution by adopting a cation exchange resin for removing impurities; S4, adding ammonia water into the perrhenic acid solution subjected to adsorption and impurities removal and performing concentrationand crystallization to obtain the high purity ammonium rhenate. According to the preparation method of the high purity ammonium rhenate disclosed by the invention, TI<+> in the ammonium rhenate solution is oxidized into TI<3+>, a harmful impurity TI is removed through a synergistic effect of hydrolytic precipitation of TI<3+> and adsorption packaging of a flocculating agent, then trace TI and other impurity elements are removed through oxidation volatilization, ion exchange and concentration crystallization to obtain the high purity ammonium rhenate with low TI content, the high purity ammonium rhenate meets the requirements of rhenium with low TI content in aeronautical material.

The invention discloses a method for comprehensive recovery of molybdenum and rhenium from high molybdenum-rhenium concentrate. The method comprises the following steps: mixing, pelletizing and roasting molybdenum-rhenium concentrate and lime to obtain a calcined material; leaching molybdenum and rhenium from the calcined material by using a sulfuric acid solution; neutralizing lixivium by adopting the calcined material to obtain a neutralization solution; purifying the neutralization solution, removing phosphorus, arsenic and silicon, and then acidifying until the pH of the solution is 2.0-3.0; synchronously extracting molybdenum and rhenium from the purified neutralization solution by adopting the solvent, and carrying out acidic precipitation on strip liquor to obtain an ammonium molybdate product; synchronously extracting molybdenum and rhenium from precipitated molybdenum mother liquor to obtain ammonium rhenate containing molybdenum; removing molybdenum from the ammonium rhenate containing molybdenum by adopting calcium chloride to obtain a purified ammonium rhenate solution; concentrating the purified ammonium rhenate solution and then adding potassium chloride to carry out rhenium precipitation, thereby obtaining a potassium perrhenate product. The method has the advantages of short process, low cost, simplicity in operation and high recovery rate, and ammonium molybdate and potassium perrhenate product can be obtained.

The invention relates to a cationic organic polymer which is obtained by performing a polymerization reaction on a compound containing imidazole groups or pyridine groups and halohydrocarbon in an organic solvent at the temperature of 0-300 DEG C for 0-24h, wherein the ratio of the imidazole or pyridine groups to halogens is 1: 1; the compound containing the imidazole groups or pyridine groups isselected from the following chemical formulas; R1 is an imidazole group or pyridine group, and m, n, p and r are independently selected from integers that are greater than 0; the halohydrocarbon is selected from the following chemical formulas; X is independently selected from F, Cl, Br or I, and m is any integer which is 0 or greater. The invention also discloses application of the cationic organic polymer prepared by the preparation method, which serves as an HTcO4 radical and/or a perrhenic acid radical, in an adsorbent.

The invention relates to an imidazolium perrhenate ionic liquid with amino groups as well as a preparation method and an application of the imidazolium perrhenate ionic liquid. The structural formula of the imidazolium perrhenate ionic liquid with the amino groups is shown as the formula (I). According to the preparation method, 3-bromopropylamine hydrobromide or 2-bromoethylamine hydrobromide is mixed with imidazolium under nitrogen protection, then the mixture is dissolved in absolute ethyl alcohol and subjected to a reflux reaction at 85-95 DEG C for 20-25 h, and an imidazolium bromide ionic liquid is obtained; the imidazolium bromide ionic liquid with amino groups and NH4ReO4 are subjected to heating reflux until no ammonia gas is emitted, cooled to the room temperature and filtered, solids are subjected to rotary evaporation and vacuum drying, and the imidazolium perrhenate ionic liquid with the amino groups is obtained. When used for catalyzing an epoxy compound to synthesize cyclic carbonate, the ionic liquid has the advantages that the yield and the activity are high, a promoter or other solvents are not needed, reaction conditions are mild, the stability is high, repeated recycling is realized and the like.

The invention relates to a supported perrhenate ionic liquid as well as a preparation method thereof. The technical scheme adopted is as follows: the preparation method comprises the following steps: selecting MCM-41 (Mobil Composition of Matters) as a carrier material; firstly, carrying out a reaction on chloropropyl triethoxysilane and the MCM-41; grafting a chloropropyl silicon structure to the surface of the MCM-41, and removing the byproduct ethanol; then, adding N-methyl imidazole so as to quaternize to obtain MCM-41 supported alkyl imidazole chlorine salt; and further adding ammonium perrhenate, and converting the chlorine salt into perrhenate through double-decompose reaction to obtain the MCM-41 supported alkyl imidazole perrhenate ionic liquid. The molar ratio of the reaction materials chloropropyl triethoxysilane, N-methyl imidazole, the MCM-41 and perrhenate is 1:(4-1):(3-1):(10-0.1). The method is applicable to support of various different types of alkyl imidazole perrhenate ionic liquids.

The invention discloses a method for preparing ammonium perrhenate, which is characterized by comprising the following steps: 1. washing and cooling flue gas generated by tungsten gold ore roasting through an eluting tower, so that perrhenic acid contained in the flue gas is dissolved in water, and the water solution containing the perrhenic acid is used for circularly eluting the roasting flue gas to increase the concentration; 2. collecting the perrhenic acid water solution, carrying out rough filtration, and carrying out nanofiltration concentration on the filtrate with nanofiltration membrane equipment to obtain a perrhenic acid nanofiltration concentrated solution; and 3. passing the perrhenic acid nanofiltration concentrated solution through continuous ion exchange equipment, eluting rhenium with a resolving agent, heating to concentrate the collected eluate at 100 DEG C, cooling, and crystallizing to obtain the ammonium perrhenate. By using the flue gas generated by tungsten gold ore roasting as the raw material, the nanofiltration membrane equipment and continuous ion exchange equipment are utilized to recover the ammonium perrhenate, thereby achieving the goals of resource recovery and environment protection; and thus, the method has favorable economic value and environmental benefit.

The invention provides a preparation method of a porous organic framework material. The method comprises the following steps: mixing tris(4-imidazolylphenyl)amine, cyanuric chloride and a solvent, andcarrying out a quaternization reaction to obtain the porous organic framework material. According to the preparation method, tris(4-imidazolylphenyl)amine TIPA and cyanuric chloride are used as raw materials for quaternization reaction, so that the prepared porous material has a special structure of a cation skeleton; and after free anions such as chlorine ions and the like exist in pore channelsare mixed with a solution containing perrhenate radicals, and selective separation of perrhenate radicals is carried out through anion exchange in the pore channels. According to the invention, experimental results show that the specific surface area of the porous organic framework material provided by the invention is 274 m<2>, the adsorption rate is as high as 100%, and the maximum adsorption capacity is 442 mg/g.

Provided is a method that enables high-purity perrhenic acid to be produced from crude rhenium sulfide using a dry process. This method for producing an aqueous solution of perrhenic acid includes: 1) a step in which roasting is performed on rhenium sulfide in the presence of an oxygen-containing gas, and gasified rhenium oxide is collected; 2) a step in which the rhenium oxide is cooled and solidified, while keeping sulfur oxides associated with the gasified rhenium oxide in a gaseous state, and then the purity of the rhenium oxide is increased by performing solid-gas separation; and 3) a step in which an aqueous solution of perrhenic acid is obtained by dissolving the solidified rhenium oxide in water, or by dissolving the solidified rhenium oxide in water after heating and gasifying the solidified rhenium oxide.

The invention relates to an epoxy plasticizer synthesis method based on perrhenate ionic liquid. The method is characterized in that the perrhenate ionic liquid with the negative ions being ReO4<-> is used as a catalyst; H2O2 is directly used as an oxidizing agent; a solvent-free method is used for catalyzing soybean oil or fatty acid methyl ester to perform epoxidation reaction, and the epoxy plasticizer is synthesized. The reaction temperature is 30 to 60 DEG C; the reaction time is 2 to 6h. After the reaction is completed, centrifugal separation is performed to separate the catalyst; an oil phase is washed to a neutral state by de-ionized water; distillation is performed, thus an epoxy product can be obtained. The used catalyst is insoluble in raw material oil; the recovery and the use are easy; the environment pollution is avoided; the quality of the obtained epoxy plasticizer is higher.

The invention belongs to the field of separation and reclamation of dispersed elements, and particularly relates to a method for separating and recovering a rhenium element. The method comprises the following steps: transforming a sample containing rhenium into a perrhenic acid ReO4<-> solution; enabling mannich alkali of calixarene to react with perrhenic acid ReO4<-> under an acid condition, so as to generate a white precipitate of perrhenic acid calixarenes ammonium salt; enabling the white precipitate of the perrhenic acid calixarenes ammonium salt to react under an alkaline condition; degrading the product into the perrhenic acid ReO4<-> and the mannich alkali of calixarene; concentrating the perrhenic acid ReO4<-> dissolved into the alkali; finally separating out perrhenate; recycling the calixarene mannich alkali after filtering. The method disclosed by the invention is simple, low in cost, free of pollution, and high in yield; no organic solvent is used in an operation process, and the pH value is controlled, so as to achieve the targets of separation and recovery. The reagent calixarene mannich alkali for recovery can be recycled.

The invention discloses a preparation method of a catalyst for catalyzing and cracking naphtha to prepare propylene. The preparation method comprises the following steps of firstly, using a hydrothermal synthesis method to prepare an EU-1/ZSM-5 composite molecular sieve; then, adding gamma-Al2O3 (aluminum oxide), uniformly mixing, forming, and loading perrhenic acid and tetrabutylammonium perrhenate by an impregnating method, so as to obtain the catalyst for catalyzing and cracking naphtha to prepare propylene. The prepared catalyst for catalyzing and cracking naphtha to prepare propylene canbe used for catalyzing and cracking the naphtha to obtain more propylene products. In the preferable implementing type, the amount of ethylene, propylene and butane is equal to 94% or above of the total weight of cracked product, and the yield rate of the propylene is high.

The invention provides a spectrophotometric method for measuring concentration of perrhenate in an aqueous solution simply and conveniently. The spectrophotometric method is characterized in that with stannous chloride taken as a reduction agent, rhenium and dimethylglyoxime form a stable orange-yellow complex in an acid solution, the solution is diluted to reach a certain volume, and then an ultraviolet-visible spectrophotometer is used for measurement. Compared with the prior art, the detection method has the advantages that pretreatment of a sample solution is not required, operation is simple and convenient, the concentration of a hydrochloric acid medium is low, few hydrochloric acid media are consumed and the like.

The invention provides an application of titanium trichloride and a treatment method of rhenium-containing wastewater, and relates to the technical field of wastewater treatment. The invention relates to the application of titanium trichloride, in particular to the application of titanium trichloride as a coagulant in wastewater. The rhenium-containing wastewater treatment method comprises the following steps: taking wastewater containing perrhenate ions, adding a titanium trichloride solution, and adding a sodium hydroxide solution to adjust the pH value to 3.2-9.2; and S2, stirring the wastewater of which the pH value is adjusted in two stages, standing for layering after the stirring is finished, and filtering. In the wastewater after the pH value is adjusted, the molar ratio of titanium trichloride to perrhenate ions is (5-30): 1. The invention provides a new application of titanium trichloride, and solves the problems that in the existing rhenium-containing wastewater, the removal effect of perrhenate is not ideal, and the technological process is complex.

Disclosed is a method of preparing a rhenium complex by use of a borohydride exchange resin, including dissolving perrhenic acid in a solution containing ethylenediamine tetraacetate, mannitol and stannous chloride to obtain a perrhenic acid solution (step 1), which is then mixed with disulfide in the presence of a borohydride exchange resin and reacts at room temperature, to obtain a rhenium complex (step 2). The preparation method of the current invention is characterized in that rhenium is reduced to have a desired oxidation number through the dissolving of the step 1, whereby the reaction of the step 2 can occur at room temperature. In addition, use of the borohydride exchange resin as a reducing agent results in direct formation of the rhenium complex of sulfide from disulfide, without the need of synthesis of thiol-protected S-precursor. Therefore, radioactive pharmaceuticals having high values can be economically and efficiently produced.

The invention discloses a method for rapidly recovering rhenium, copper and lead from copper smelting waste acid and a device for implementing the method. According to the method, the copper smelting waste acid is subjected to lead removing through filtering, lead residues with the lead content higher than 55% are obtained and taken as lead extraction raw materials, the lead extraction raw materials are subjected to targeted rhenium precipitation, rhenium-rich residues are obtained and are subjected to hot-pressing oxidizing leaching, a rhenium-rich leaching agent is obtained, the rhenium-rich leaching agent after evaporation and concentration is subjected to KCl rhenium precipitation and recrystallization, potassium perrhenate is prepared, and a liquid obtained after rhenium precipitation is vulcanized for copper deposition. The device comprises a rhenium and copper precipitant storage tank, a precipitation tank, a flocculating agent storage tank, a flocculation reaction tank, a reaction kettle, an evaporation-crystallization device, a centrifugal separator, a waste acid anti-gravity-osmosis filter, a rhenium-rich copper residue anti-gravity-osmosis filter, a filter press, a rhenium and copper precipitation tank steam heating system, a copper precipitation tank steam heating system and a slurry pump. The method and the device have the characteristics of low investment, rapid and short procedures, simple and efficient operation, and high recovery rate, and are clean and environment-friendly.

The invention provides a process for synthesizing methyltrioxorhenium from perrhenates, which comprises oxidizing rhenium metallic powder with nitric acid to obtain perrhenic acid, reacting with water-soluble metal salts to obtain silver perrhenate or potassium perrhenate or barium perrhenate, then reacting perrhenates with trimethylchlorosilan and tetramethylstannane to obtain MTO, finally carrying out post-treatment to obtain high purity MTO.

Provided is a method that enables high-purity perrhenic acid to be produced from crude rhenium sulfide using a dry process. This method for producing an aqueous solution of perrhenic acid includes: 1) a step in which a first roasting is performed on rhenium sulfide in the presence of an oxygen-containing gas, generating rhenium oxide and sulfur oxide, and then gasifying and discharging the sulfur oxide to obtain rhenium oxide as a roasting residue; 2) a step in which a second roasting is performed on the roasting residue in the presence of an oxygen-containing gas, and gasified rhenium oxide is collected; 3) a step in which the gasified rhenium oxide is solidified by cooling, or a step in which an aqueous solution of perrhenic acid is obtained by dissolving the gasified rhenium oxide in water while cooling the gasified rhenium oxide; and 4) and a step in which, if the rhenium oxide was solidified, an aqueous solution of perrhenic acid is obtained either by dissolving the solidified rhenium oxide in water, or by dissolving the solidified rhenium oxide in water after heating and gasifying the solidified rhenium oxide.