A method of producing a sorbent

 

(57) Abstract:

A method of producing a sorbent relates to the production of selective sorbents for extraction of toxic and valuable components from aqueous media. The method consists in the adsorption on macroporous anion exchange resin polyfunctional compounds with subsequent condensation with formaldehyde inside the pores of the resin, the polyfunctional compounds are used soluble sulfides or hydrosulfides metals or gaseous hydrogen sulfide, and the anion exchange resin is a macroporous anion exchange resin polymerization or polycondensation of the type containing the group of Quaternary ammonium bases and/or primary and secondary amino groups. The method allows to obtain a sorbent for the selective and efficient extraction of ions of mercury and silver from various aquatic environments.

The invention relates to the production of selective sorbents for extraction of toxic and valuable components from aqueous media.

Known methods for producing sorbents type "snake in a cage" by the polymerization and polycondensation of polyfunctional compounds inside the porous cations and polyampholytes [1,2]

Also known is a method of obtaining the major groups of Quaternary ammonium bases) phenol as counterion followed by its condensation with formaldehyde inside the pores of the resin and obtain a sorbent-type "snake in the cage. This method is chosen for the prototype [3]

This sorbent contains both anion-exchange and cation-exchange groups and can be used for simultaneous extraction of cations and anions from aqueous media. However, it is not used in the extraction of metals such as mercury and silver, which is highly toxic and valuable substances.

The task of the invention to provide ion-exchange sorbent type "snake in the cage, efficient and selective when removing mercury and silver from aqueous media.

The problem is solved by using as compounds sorbed on anion exchange resin and then condensed with formaldehyde, serosoderjaschei connections.

The method of producing the resin is adsorption on macroporous anion exchange resin sulfide ions, the source of which may be water-soluble sulfides and hydrosulfides metals or gaseous hydrogen sulfide, followed by condensation of adsorbed sulfide ions with formaldehyde inside the pores of the anion type "snake in the cage.

As the use of the anion macroporous anion exchange resin polymerization or polycondensation type strong-base and weak-base anion, i.e., containing the-10p (strong-base anion exchange resin curing type); An-221 (weakly basic anion exchange resin curing type); AGE-10-p (polycondensation epoxypropanol anion exchange resin containing weakly basic amino groups and up to 10% of the strong-base groups) and others.

Example 1. After 10 g of strong-base anion exchanger AV-17-10p (styrene-divinylbenzene matrix) with the static exchange capacity (SOY), equal to 2.75 mm/g, pass 100 ml of 0.1 G. of an aqueous solution of sodium sulfide for sorption of sulfide ions, the anion exchange resin is washed with water and transferred to which is added 60 ml of a mixture of formalin and water (1:1) and kept under stirring without heating for 2 hours Finished product is washed with water, 3% alkali and with water again. The sulfur content in the final product is 1.20 mm/year

Example 2. In example 1 through the anion exchange resin AV-17-10p miss 100 ml of 0.1 G. of an aqueous solution of sodium hydrosulfide. The finished product contains 1,28 mm/g of sulfur and SOY=3,34 mm/year

Example 3. Through 10g weakly basic anion an-221 (styrene-divinylbenzene matrix, SOY=BM/g) pass the mixture of air and hydrogen sulfide for sorption (concentration of H2S 20 mg/l, the feed rate of the gas mixture 15 l/h, the time of filing a mixture of 1 h 20 min). Further according to the example 1. The sulfur content in the finished product 1.00 mm/g, SOY=2,52 mm/year

Prima, SOY=9,02 mm/g miss air-gas mixture for the sorption of hydrogen sulfide (concentration of H2S 40 mg/l, the feed rate of the mixture of 15 l/h, alarm time 2 h). The anion exchange resin is transferred into the reaction flask and the example 1 is treated with 120 ml of a mixture of formalin and water and washed. The sulfur content in the final product of 2.68 mm/g, SOY 6,89 mm/year

The synthesized sorbents were tested for the sorption of mercury from chloride media at pH 1 2 and on the sorption of silver from nitric acid media at pH 1 to 2. The distribution coefficients defined on isotopes Ag and Hg on the background trace (1 mg/l) inactive Ag and Hg, amounted to Hg 1140 2240 and for Ag 4720 6220 depending on the type of the source of the resin. Maximum capacity on mercury accounted for adsorbents of examples 1 and 2 2.0 mm/year, for sorbents according to examples 3 and 4 1.9 mm/g and 1.8 mm/year, respectively. Maximum capacity of silver for the adsorbents of examples 1 and 2 was 1.2 mm/year, for sorbents according to examples 3 and 4 - 1.0 mm/year and 1.4 mm/year, respectively.

The synthesized sorbents can be regenerated by methods recommended for ion exchangers methylthiophenyl groups [4]

The way the sorbent by adsorption on macroporous anion exchange resin polyfunctional compound with subsequent coia use water-soluble sulfides and hydrosulfides metals or hydrogen sulfide, and as the use of anion exchange resins, macroporous anion exchange resin polymerization or polycondensation of the type containing the group of Quaternary ammonium bases and/or primary and secondary amino groups.

 

Same patents:
The invention relates to the production of slightly basic, macroporous anion exchange resin curing type, which can be used in various reactions of ion exchange for water treatment plants nuclear and thermal power plants, household filters for purification of industrial effluents and gaseous emissions
The invention relates to the production of chemisorptive fibers by polymineralic transformations fiber-based chain polymers, in particular on the basis of polyacrylonitrile, copolymers of polyacrylonitrile or polyvinyl chloride

The invention relates to a technology for chromatographic materials used for studying the chemical composition of biological objects in the chemical, pharmaceutical and food industry

The invention relates to the field of chemical technology of fibrous ion-exchange materials and can be used in nuclear power to control and clean water coolant of the primary and secondary circuits of nuclear power plants

The invention relates to the field of wastewater treatment and gas emissions, and is intended, in particular, to capture waste compounds chromium-VI, nitric acid, oxides of nitrogen

The invention relates to the field of macromolecular compounds, namely, to obtain polymer biocatalysts for the decomposition of urea in aqueous solutions by immobilization of the enzyme urease on the polymer carrier

The invention relates to methods for cation method of sulfonation, as well as to methods of disposing of liquid wastes of petrochemical processes, in particular reflexly wastewater treatment process, the joint production of acetylene and ethylene high-temperature homogeneous pyrolysis of light petroleum products and waste sulfuric acid containing organic impurities [1]

FIELD: chemistry of polymers, chemical technology.

SUBSTANCE: invention relates to sulfoxides or sulfones grafted on polymers, polymeric compositions, a method for grafting and method for stabilization of polymers. Invention describes polymers comprising a grafted compound of the formula (I): [R1-SOm]n-R-SOp-R2 (I) wherein total symbols have values given in cl. 1 of the invention claim and represents a composition comprising thereof, a method for grafting compound of the formula (I) on polymers and a method for stabilization of polymers. Polymers comprising grafted sulfoxides or sulfones possess high stability against oxidative, thermal, dynamic destruction caused by the light effect and/or destruction caused by ozone effect.

EFFECT: improved preparing method, improved and valuable properties of polymers.

14 cl, 14 tbl, 24 ex

FIELD: chemistry.

SUBSTANCE: polymer, whose chain ends are modified, contains a product of reacting a living anionic elastomeric polymer and a silane sulphide modifier of formula: (RO)x(R)ySi-R'-S-SiR3. The invention also relates to a vulcanised composition based on the elastomeric polymer and a method of preparing said composition. The method involves combining filler, vulcanising agent, elastomeric polymer modified on chain ends and vulcanisation of the elastomeric polymer composition. The composition is used to make articles such as pneumatic tyres, tyre protectors, belts and suchlike.

EFFECT: preserving good technological properties and good balance of physical and mechanical properties, including wear resistance, breaking strength, apparent tensile stress and breaking elongation.

23 cl, 9 tbl, 19 ex

FIELD: chemistry.

SUBSTANCE: method involves (co)polymerisation of butadiene in the presence of a catalyst based on a rare-earth element and organoaluminium compounds followed by treatment of the (co)polymer with a modifying agent. The modifying agent used is xanthates. The process is carried out in weight ratio of the modifying agent to the (co)polymer equal to 0.01-0.1:1000.

EFFECT: simple method of producing said compound with narrow molecular weight distribution, characterised by low cold flow, kinematic viscosity and low content of high-molecular fractions.

1 cl, 5 ex, 5 tbl

FIELD: chemistry.

SUBSTANCE: invention relates to a method of producing a sulphur-containing polyacrylamide derivative, having in three types of elementary units in the macrochain:

, , , in ratio of 1:2:2, by reacting a carboxylic acid amide with hydrogen sulphide-saturated aqueous solution of formaldehyde with ratio amide:H2S:CH2O=1:2:3 in an aqueous medium, characterised by that the carboxylic acid amide used is an atactic polyacrylamide in form of 1% aqueous solution; the reactants react at 20-30°C for 20-25 hours; the product is extracted by neutralising the reaction mixture with hydrochloric acid to a neutral medium, followed by precipitation of the product with ethyl alcohol with volume ratio of the reaction mixture to alcohol equal to 1:3, while adding concentrated sodium chloride solution which is used as a coagulant, washing the precipitate with 70% ethyl alcohol solution and drying the washed precipitate.

EFFECT: simple method.

2 ex

FIELD: chemistry.

SUBSTANCE: composition contains at least one bitumen and at least one graft polymer, having a polymer backbone chain and at least one side graft component linked to the polymer backbone chain. Said graft component has a branched or straight saturated hydrocarbon chain having 18-110 carbon atoms. The graft polymer is obtained by reacting at least one double bond of the polymer and a thiol group of the graft component, where the polymer is obtained by copolymerisation of diene monomers. The invention also relates to a method of preparing such thermoreversibly crosslinked bitumen-polymer compositions, as well as use of such compositions in road construction, particularly for producing binding materials for roads, and in different industries.

EFFECT: bitumen-polymer compositions have, at operating temperatures, properties of bitumen-polymer compositions which are irreversibly cross-linked, particularly in terms of elasticity and stickiness, and have low viscosity at treatment temperatures.

17 cl, 1 tbl, 4 ex

FIELD: chemistry.

SUBSTANCE: present invention relates to a method of neutralising a sulphonated block copolymer, versions of a neutralised sulphonated block copolymer, versions of devices having a membrane, a means of storing a polar component and a method of stabilising or storing a polar component. The neutralisation method involves obtaining a micellar solution containing 1-30 wt % unneutralised block copolymer and an organic solvent, and adding a metal compound. The unneutralised sulphonated block copolymer is solid in water and has the general configuration A-B-D-B-A, A-D-B-D-A, (A-D-B)n(A), (A-B-D)n(A), (A-B-D)nX, (A-D-B)nX or mixtures thereof, where n is an integer from 2 to 30, X is a coupling reaction agent residue. Each block A essentially does not contain any sulphonic acid functional groups or sulphonate groups. Each block B is a polymer block containing 10-100 mol% sulphonic acid functional groups or sulphonate groups based on the total number of monomer links of block B. Each block D is a modifying impact-resistant block, characterised by glass transition temperature below 20°C. The organic solvent is formed by one or more aprotic apolar aliphatic solvents and is a nonpolar liquid phase. 80% to 100% sulphonic acid functional groups or sulphonate groups of the sulphonated blocks B are neutralised with a polar component - a metal compound which contains sodium, potassium, caesium, magnesium, calcium, strontium, barium, aluminium, tin, lead, titanium, zirconium, vanadium, chromium, molybdenum, manganese, iron, cobalt, nickel, copper, silver, zinc, cadmium or mercury or contains a metal from periods 3-6 and groups 2-14 of the Periodic Table of Elements. The neutralised block copolymer is used in a membrane. A device having such a membrane is selected from a group comprising a moisture monitoring device, a direct electrodialysis device, a reverse electrodialysis device, an pressure-limited osmosis device, a direct osmosis device, a reverse osmosis device, a selective water addition device, a selective water removal device and accumulators. The means of storing a polar component comprises a nonpolar liquid phase, 1-30 wt % sulphonated block copolymer in micellar form, adapted to confine the polar component. The method of stabilising or storing the polar component involves preparing a solution containing a nonpolar liquid phase and a sulphonated block copolymer and adding the polar component. The polar component is then confined in the micelle.

EFFECT: invention enables to obtain membranes which are capable of facilitating transfer of water at a high rate while blocking transfer of other chemicals, without considerable swelling of the ion-containing phase.

33 cl, 4 tbl

FIELD: chemistry.

SUBSTANCE: invention relates to field of organic chemistry, namely to hydrophilic polymer compound, including polymer compound, which inhibits platelet adhesion, and compound, inhibiting blood clotting reaction, covalently bound with said polymer compound, where said polymer compound, inhibiting platelet adhesion, represents copolymer of monomers, selected from the group, consisting of vinylacetate, vinylpyrrolidone and siloxane, with said copolymer having amino group for formation of covalent bond with compound, inhibiting blood clotting; and where compound, inhibiting blood clotting reaction, represents compound, expressed by general formula (I) , where R1 represents (2R,4R)-4-alkyl-2-carboxy-piperidino group, R2 represents 1,2,3,4-tetrahydroquinoline, substituted with lower alkyl group. Invention also relates to means for processing surface of medical devices or medical materials based on hydrophilic polymer compound.

EFFECT: novel hydrophilic polymer compound, possessing useful properties is obtained.

8 cl, 3 dwg, 2 tbl, 14 ex

FIELD: chemistry.

SUBSTANCE: invention relates to polymers, functionalised by polyoxime compounds, and methods of obtaining thereof. The method of obtaining a functionalised polymer includes the following stages: (i) polymerisation of a conjugated diene monomer with obtaining a reactionable polymer; and (ii) interaction between the reactionable polymer and a protected polyoxime compound, where the protected polyoxime compound includes two or more protected oxime groups and where the two or more protected oxime groups are described by formula -CR1=N-O-R2, in which R1 represents a hydrogen atom or a monovalent organic group and R2 represents a monovalent organic group.

EFFECT: obtained functionalised polymers impart lower hysteresis and lower cold flow.

16 cl, 4 dwg, 6 tbl, 25 ex

FIELD: chemistry.

SUBSTANCE: invention discloses a graft polymer, comprising a main polymer chain P, containing conjugated diene links; at least one side graft chain G, represented by general formula (1) R-(OCH2CH2)m-S-, (1), where R is a saturated, linear or branched hydrocarbon chain, containing at least 18 carbon atoms, and m is an integer, ranging from 0 to 20, wherein said graft chain G is bonded to main polymer chain P through a sulphur atom of formula (1); and at least one grafted chain G', represented by general formula (4) -S-R’-S-, (4), where R’ is s hydrocarbon group, saturated or unsaturated, linear or branched, cyclic and/or aromatic, containing from 2 to 40 carbon atoms, optionally containing one or more heteroatoms, wherein said graft chain G' is bonded to main polymer chain P using each sulphur atom from formula (4). Invention discloses a method of producing graft polymer and use thereof to obtain thermoreversibly cross-linked bitumen/polymer composition. Present invention also relates to thermoreversibly cross-linked bitumen/polymer composition, containing such graft polymer, method for production thereof and to a bitumen mixture, including such composition.

EFFECT: technical result is improvement of rheological properties, in particular, mechanical and elastic properties, and cohesive capacity thermoreversibly cross-linked bitumen/polymer compositions.

20 cl, 2 tbl

FIELD: chemistry.

SUBSTANCE: invention relates to compositions containing sulphur-containing polymers, such as polythioethers and polysulphides, polyepoxides and controlled release amine catalysts, used in aerospace sealing materials. Composition contains a sulphur-containing polymer, selected from a sulphur-containing polymer with a terminal thiol group, blocked sulphur-containing polymer with a terminal thiol group and combinations thereof, polyepoxy hardener and a controlled release amine catalyst, including a matrix sealing substance containing an amine catalyst.

EFFECT: invention provides a controlled rate of hardening of composition and a long shelf life in storage.

19 cl, 7 tbl, 2 dwg, 7 ex

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.

2 ex

Up!