A method of obtaining a complexing ion exchanger
(57) Abstract:Usage: getting complexing resins for use in analytical chemistry and in hydrometallurgy for the extraction of platinum metals. The inventive condensation of melamine with formaldehyde in aqueous solution in the presence of an alkaline agent, followed by the introduction of acid agent and curing the condensation products. The condensation is carried out in the presence of a heterocyclic amine with a molar ratio of melamine, formaldehyde and a heterocyclic amine, equal 1 : (3 - 5) : (2 - 4). The cured products of the condensation is carried out at 150 - 160S. As the heterocyclic amine used 3(5)-methylpyrazole, imidazole, benzimidazole. 1 C. p. F.-ly, 2 tab. The invention relates to methods for complexing ion exchangers designed for the recovery of precious metals from solutions, and can be used in analytical chemistry and in hydrometallurgy for the extraction of platinum metals from solutions.A method of obtaining soluble oligomers having complexing properties  . Synthesis of oligomers is carried out by polycondensation of kinomechanika, aldehyde and timachev the (guanidine) to 38.8%, pre-neutralized formalin solution. The condensation is carried out in the course of 2 hours Obtained by this method oligomers can be used for the deposition of precious metals from solutions, however, along with the noble metals are deposited also many heavy metals, which reduces the selectivity of the extraction. In addition, the process of extracting metals volumes of solutions and the time spent on precipitation, sedimentation and filtration.A method of obtaining the anion exchange resin by condensation of melamine with formaldehyde in aqueous solution in two stages with the introduction of the first stage alkaline agent to a pH of 7-8  . The condensation is carried out at 68-72aboutC. After dissolution of the melamine mass is then cooled to 57aboutWith and condensation continue in the presence of an acid agent, which is used as a mixture of sulfuric and hydrochloric acids. The mixing ratio melamine: H2SO4: HCl= = (0,9-1,1): (0,4-0,6): 1. The obtained polymer utverjdayut 1-42 h at 90aboutC, crushed, washed and dried. The resulting anion exchange resin characterized by a high dynamic capacity in relation to the anions, osmotic stability and mechanical strength. Sorption properties of anion exchange resin obtained by this spamrazer polycondensation of the resin type, with complexing ability and high selectivity with respect to the platinum group metals, the production and application of which may be technologically and economically feasible. The task is relevant in connection with the problem of extracting platinum group metals from industrial and waste solutions in the hydrometallurgical processing of platypodinae raw materials.According to the invention, it is proposed a method of obtaining a complexing ion exchanger through co-condensation of melamine and heterocyclic amine containing group of the pyrazole or imidazole with formaldehyde in aqueous solution when heated in the presence of an alkaline agent, followed by the introduction of acid agent and curing the resulting product at 150-160aboutC, washing with water and drying. Melamine, formaldehyde and heterocyclic amine take in a molar ratio of 1: (3-5): (2-4). As the heterocyclic amine used 3(5)-methylpyrazole, imidazole, benzimidazole.Thus obtained ion exchanger contains links melamine and heterocyclic amine, which is confirmed by the presence of characteristic bands in the IR spectra of diffuse reflection, responsible fluctuations is SUP> for benzimidazole.Sorption materials obtained by the proposed method are products of light-yellow color, stable in acid and alkaline solutions on cold and when heated, and can be used for sorption extraction of platinum metals in powder form or in the form of fibrous materials, is full of these polymers. The sorption capacity (mg/g) complexing resins obtained by the proposed method are given in table. 1.The sorption capacity of ion-exchange resin (mg/g) determined from R-RA 1M Hcl. The metal concentration of 4 g/L.Obtained by the proposed method, the ion exchangers are characterized by selective sorption extraction of platinum metals from acidic solutions: the allowable concentration of copper (II) and iron (III) in solutions of 50 g/l Balance by sorption of platinum metals from 1M Hcl achieved within 30-40 minutesP R I m e R 1. In a reactor equipped with a stirrer and a thermometer, dissolve 6.3 g of melamine in 13.5 ml of 30% aqueous formaldehyde solution at 70-80aboutC and pH 8.5-9. Add to 16.4 ml of 3(5)-methylpyrazole and heated at the same temperature under stirring for 10-15 min, then the mixture is cooled to 60-65aboutC and add 10 ml of the form is the temperature of 150-160aboutC for 6-8 hP R I m m e R 2. In the reactor dissolve 6.3 g of melamine in 13.5 ml of 30% aqueous formaldehyde solution at 70-80aboutC and pH 8.5-9, and then to the solution was added 6.8 g of imidazole and stirred at this temperature for 10-15 minutes Then proceed as in example 1. The content in the product: C to 38.8% ; N, 5.2%, Respectively ; S is 33.8% . The degree of swelling in 1M Hcl 170% .P R I m e R 3. In a reactor equipped with a stirrer and a thermometer, dissolve 6.3 g of melamine in 13.5 ml of 30% aqueous formaldehyde solution at 70-80aboutC and pH 8.5-9, and then to the solution was added 11.8 g of benzimidazole and stirred at the same temperature for 10-15 minutes Then proceed as in example 1. The content in the product: From 46.9% ; N 5,1% ; S 31,5% . The degree of swelling of 160% .Sorption properties of the products obtained relative to the platinum metals are given in table. 2. 1. A method of OBTAINING a COMPLEXING ion exchanger by condensation of melamine with formaldehyde in aqueous solution in the presence of an alkaline agent, followed by the introduction of acid agent and curing the condensation products, characterized in that the condensation is carried out in the presence of a heterocyclic amine containing group of the pyrazole or imidazole, in a molar ratio of melamine, formaldehyde and a heterocyclic amine, R is audica fact, as a heterocyclic amine used 3(5)-methylpyrazole, imidazole or benzimidazole.
FIELD: sanitary and hygienic facilities.
SUBSTANCE: invention relates to technology of manufacturing chemisorption materials for use in municipal hygiene sphere. Method consists in treatment of chemisorption carboxyl-containing material in Na form with 0.5-1.0% aqueous acid solution, e.g. hydrochloric acid solution, at modulus (ratio of weight of chemisorption material to acid solution volume) 1:30 and treatment time 0.5-1.0 h to transfer material into H-form. Chemisorbent is then washed with softened water to pH 5-6, after which material in H-form is treated for 0.5-1.0 h with 0.5-1.0% potassium hydroxide solution, modulus 1:30. At the expiration of treatment time, material is washed with softened water to pH 5.0-6.5. Presence of three-dimensional lattice, both during treatment time of chemisorption material in the form of fibers or nonwoven material and upon use of products from this material, prevents dissolution of polymer in water or in aqueous solution of acid or potassium hydroxide. Owing to filtration, chemisorbent entraps in water heavy metal ions contained therein and water is saturated with potassium ions so that chemisorption material acquires at least 4 mmol/g of carboxyl groups in K-form.
EFFECT: optimized manufacture conditions.
SUBSTANCE: invention relates to technology for preparing sorbents with fibrous structure by using waste of industrial manufacture. Method involves treatment of fibrous matrix from waste of tanning leather chips with polyelectolyte an aqueous solution obtained by alkaline hydrolysis of polyacrylonitrile or copolymer based on thereof. Prepared sorbent shows the improved capacity for extraction of different components from different aqueous media.
EFFECT: improved preparing method, improved and valuable properties of sorbent.
2 cl, 1 tbl, 2 ex
FIELD: polymer materials.
SUBSTANCE: invention relates to manufacture of ion-exchange fibers with special properties, which can be used as sorbent or as a sorbent constituent for cleaning liquid media, largely natural and waste waters. Method consists in performing alkali hydrolysis of polyacrylonitrile fiber in presence of hydrazine at elevated temperature completed by treatment of fiber with active agent causing degradation of chromophore groups of fiber. Alternatively, ion-exchange fiber is manufactured via alkali hydrolysis of polyacrylonitrile fiber in presence of hydrazine at elevated temperature, hydrolysis reaction being effected in concentrated solution of salt of alkali metal with weak acid followed by treatment of fiber with active agent as above.
EFFECT: improved characteristics of fiber at lower consumption of reagents and stabilized manufacturing process to provide ion-exchange fiber with desired number of chelating sorption groups due to appropriate balance of acid and basic groups resulting from hydrolysis.
18 cl, 5 tbl, 16 ex
FIELD: waste water and gas emission treatment.
SUBSTANCE: invention relates to methods for preparing catalytic materials to clean waste waters and gas emissions via removal of organic and inorganic components by liquid-phase oxidation process. Method comprises consecutive treatment of knitted cloth with hot alkali solution containing 14-42 g/L hydroxylamine chloride and an aqueous solution of variable-valence metal salts. In the first stage, treatment is carried out with modifying hydroxylamine chloride and ethylenediamine-containing solution wherein molar ratio of polyacrylonitrile unit number to ethylenediamine ranges from 2 to 10 and solution pH is 6-9. Treatment temperature is 95-105°C and treatment time 1-1.6 h. In the second stage, treatment with aqueous solution of variable-valence metal salts is carried out for 0.5 to 2 h.
EFFECT: simplified manufacture technology, reduced expenses on reagents, and reduced process time without loss in the firmness of fixation of variable-valence metal salts on cloth.
2 tbl, 21 ex
FIELD: catalysts for waste water and emission gas treatment.
SUBSTANCE: invention relates to technology of removing organic and inorganic components from waste waters and emission gases via liquid-phase oxidation, in particular, to preparing textile-supported polymer catalyst consisting of polyacrylonitrile monothreads and complex threads. Knitted cloth is treated with modifying solution at 106 to 150°C for 10 to 30 min when ratio of amounts of polyacrylonitrile units to amount of chlorine-containing hydrazine salt equal to 20-30 and the same to chlorine-containing hydroxylamine salt 10-15, pH of solution being 6-9. After that, cloth is treated with transition metal salts for 1.0-2.0 h until content of metal on catalyst achieves 0.81-1.2 mmol/g. Treatment is followed by washing with desalted water.
EFFECT: simplified catalyst preparation technology and intensified preparation process.
2 cl, 2 tbl, 30 ex
FIELD: chemical technology, resins.
SUBSTANCE: invention relates to a method for preparing polyhalide strong-basic anion-exchange resins of gel and macroporous structure designated for disinfection of water in closed ecological objects, domestic drinking water and water from non-checked sources. Polyhalide anion-exchange resins is prepared from strong-basic quaternary ammonium anion-exchange resins in chloride form by their iodination with J2 solution in KJ at stirring, thermostatic control and washing out. Iodination is carried out with triiodide solution on conditioned strong-basic anion-exchange resins in chloride form in the content of strong-basic groups 80%, not less, in the mole ratio anion-exchange resin : triiodide = 1.0:(1.1-1.5). Ready product is kept at 20-55°C additionally. Invention provides preparing polyhalide anion-exchange resins characterizing by high resource in water disinfection and in simultaneous reducing iodine release in disinfecting water in retention of high disinfecting indices.
EFFECT: improved preparing method.
1 tbl, 8 ex
FIELD: ION-EXCHANGE MATERIALS.
SUBSTANCE: invention relates to a process of preparing gel-like cationites for use in treatment and purification processes. Gel-like cationites are prepared by inoculating-incoming process wherein (a) aqueous suspension of microcapsulated cross-linked styrene polymer in the form of granules and containing cross-linking agent is provided as inoculating polymer; (b) inoculating polymer is left to swell in monomer mixture composed of vinyl monomer, cross-linking agent, and radical initiator, namely peracid aliphatic ester; (c) monomer mixture is polymerized in inoculating polymer; and (d)resulting copolymer is functionalized via sulfatization. Process is characterized by that, in step (a), content of cross-linking agent in cross-linked styrene copolymer amounts to 3.5-7 wt % and inoculum-to-income ratio in step (b) amounts to 1:(0.25-1.5).
EFFECT: enabled preparation of gel-like cationites having high osmotic and mechanic stabilities as well as improved oxidation resistance.
7 cl, 9 tbl, 9 ex
FIELD: chemical technology.
SUBSTANCE: invention relates to technology for preparing chemosorption materials possessing high protective properties with respect to ammonia vapors that can be used for using in filtering protective devices. Method involves impregnation of nonwoven activated fabric made of hydrocellulose fibers in an aqueous solution containing zinc chloride and nickel chloride. Also, this solution contains 1,2,3-propanetriol (glycerol) as a modifying agent taken in the amount 0.5-1.0% of the total amount of the prepared solution.
EFFECT: improved preparing method.
1 tbl, 1 ex
SUBSTANCE: invention can be used for extracting metal ions, purifying waste and industrial solutions from toxic metal ions. The method of obtaining anion-exchange fibre material involves reacting activated polyacrylonitrile fibre nitron and 30-70 wt % modifying agent - mixture of diethanolamine with 10-30 wt % hexamethylenediamine in an aqueous 5% solution of dimethylformamide. Nitron is activated in a 3-6% aqueous alkaline solution for 3-5 minutes at 90-95°C.
EFFECT: invention makes it easier to obtain fibrous anionite and can be used for effective purification waste water from leather industry and electroplating plants from chromium (VI) ions, and for concentrating and separating chromates from industrial solutions.
1 tbl, 4 ex
SUBSTANCE: composition is meant for producing cation-exchange fibre material used in water treatment processes and treatment of industrial sewage. The composition is also used to soften and desalinate water, in production of synthetic detergents, in the paint industry and industry of polymer materials. The composition consists of paraphenol sulphonic acid and formalin. The composition additionally contains filler - basalt wool. The basalt wool is first heat treated for 1 hour at temperature 350-450°C, followed by microwave treatment at 180 or 750 W for 30 s. Content of components is as follows, wt %: paraphenol sulphonic acid 50-55.8, formalin 40.9-35.1; basalt wool 9.1. The composition enables synthesis of cation-exchange fibre material with improved properties, particularly lower oxidation number of the filtrate, higher specific volume of the cationite, as well as high dynamic exchange capacity and high osmotic stability of the cationite.
EFFECT: composition enables synthesis of cation-exchange fibre material with improved properties.
1 tbl, 4 ex