185 results about "Diethylenetriamine" patented technology

The application discloses a self-repairing crystal anti-permeation high-durability cement-based material, a cement-based surface structure and a paving method thereof. The self-repairing crystal anti-permeation high-durability cement-based material comprises the following components in parts by weight: Portland cement 40-60 parts, wear-resistant aggregate 35-50 parts, water reducing agent 0.02-0.05 parts, retarder 0.2-0.5 parts, redispersible emulsion powder 1-2 parts, silica fume 1-2 parts, expanding agent 1-3 parts, chelating agent 1-6 parts and crystallization precipitant 1-6 parts; the total amount of the above components is 100 parts; the chelating agent is diethylenetriamine pentaacetic acid, and the weight ratio of the chelating agent to the crystallization precipitant is (0.5-2):1. The cement-based material has excellent self-repairing property, so that the strength, durability and anti-permeation property of the cement-based material are significantly improved.

The invention provides a perfluoroethanone microcapsule and a preparation method thereof, and belongs to the technical field of fire extinguishing materials, the perfluoroethanone microcapsule comprises a core and a shell layer; the core comprises perfluorohexanone and fumed silica; the shell layer comprises isophorone diisocyanate, diethylenetriamine and a chlorine-containing monomer, and the isophorone diisocyanate, the diethylenetriamine and the chlorine-containing monomer are subjected to an interfacial polymerization reaction to form a polyurea-polyurethane hybrid network; the mass ratio of the shell to the core of the microcapsule is 1: (5-20); the anhydrous microcapsule core is constructed through an oil-in-oil type anhydrous interfacial polymerization system, so that the hydrolysis side reaction is fundamentally avoided, the microcapsule has higher stable encapsulation efficiency, and the reliability and long-term effectiveness of the product in the storage and use processes are ensured.

The invention discloses an amorphous PtNi self-supporting catalytic electrode, a preparation method thereof and a direct ammonia fuel cell, and belongs to the technical field of electrode materials. According to the technical scheme, the catalytic electrode adopts foamed nickel as a conductive framework substrate, and an amorphous PtNi alloy wall-shaped array structure grows on the foamed nickel in situ; the preparation method of the catalytic electrode comprises the following steps: pretreating the foamed nickel substrate; the preparation method comprises the following steps: adding platinum diacetylacetonate, potassium hydroxide, N, N-dimethylformamide and diethylenetriamine into ethylene glycol to prepare a precursor solution; and immersing foamed nickel into the precursor solution, and carrying out in-situ growth reaction under high-temperature and high-pressure conditions to obtain the amorphous PtNi self-supporting catalytic electrode. The catalytic electrode has the beneficial effects that the catalytic electrode shows high specific activity and extremely low apparent activation energy in ammoxidation reaction, still keeps 90% of current density after continuously working for 1000 hours, and shows excellent long-term stability and durability.

The invention discloses a preparation method and application of a metal sulfide adsorbent for adsorbing iodine and methyl iodide. The preparation method comprises the following steps: uniformly mixing an antimony source, a sulfur source, a deep eutectic solvent, polyamine and water to obtain a mixed solution; and transferring the mixed solution into a high-pressure reaction kettle, sealing, carrying out hydrothermal reaction at 110-220 DEG C for 2-9 days, cooling to room temperature to separate out crystals, and filtering, washing and drying to obtain the metal sulfide adsorbent. The invention also discloses application of the metal sulfide adsorbent in adsorption of iodine and methyl iodide. The metal sulfide adsorbent disclosed by the invention has a good adsorption effect on iodine and methyl iodide, and compared with an ethylenediamine-oriented metal sulfide adsorbent, the diethylenetriamine-oriented metal sulfide adsorbent has higher adsorption capacity on iodine and methyl iodide.

The invention discloses a preserving fluid for stably preserving sample DNA at normal temperature and a preparation method thereof, and belongs to the technical field of biological sample preservation. The preserving fluid comprises a lysis system, a nucleic acid protection system and a buffering and stabilizing system, the cracking system comprises a composite surfactant and an enzymolysis auxiliary agent; the composite surface active agent is prepared from polyether polyol fatty acid ester and cocamidopropyl hydroxy sulfobetaine; the enzymolysis auxiliary agent comprises lysozyme Lyso-V and protease K; the nucleic acid protection system comprises a nitrogen heterocyclic polyamine-carboxylic acid derivative and dextran sulfate; the nitrogen heterocyclic polyamine-carboxylic acid derivative comprises 1, 4, 7, 10-tetraazacyclododecane-N, N ', N' ', N ''tetraacetic acid, 1, 4, 7-triazacyclononane-N, N', N''-triacetic acid, disodium ethylene diamine tetraacetate-nitrogen heterocyclic derivative, and diethylenetriamine pentaacetic acid-piperazine derivative, and the nitrogen heterocyclic polyamine-carboxylic acid derivative comprises 1, 4, 7, 10-tetraazacyclododecane-N, N ', N '', N'' tetraacetic acid, 1, 4, 7-triazacyclononane-N, N', N ''-triacetic acid. The buffering and stabilizing system comprises an amphoteric buffering agent and a polymer stabilizer; the amphoteric buffering agent comprises 2-(N-morpholino) ethanesulfonic acid and N-tri (hydroxymethyl) methylglycine.

The invention provides a cationic waterborne epoxy hardener without containing free amine and a preparation method thereof, and relates to the technical field of epoxy hardeners, the method comprises the following steps: 1) mixing small molecular aldehyde and hydroxyethyl diethylenetriamine for reaction to obtain oxazolidine and aldimine terminated modified amine; (2) carrying out reaction on the modified amine and polyfunctional epoxy resin to obtain modified oxazolidine and aldimine-terminated modified resin amine; 3) mixing the modified oxazolidine and aldimine terminated modified resin amine, monofunctional glycidyl ether and water for reaction to obtain terminated modified resin amine; and 4) adding small molecular acid to neutralize the terminated modified amine, and transferring water to obtain the cationic waterborne epoxy curing agent without free amine. The paint film can be endowed with excellent boiling water resistance, acid and alkali resistance, neutral salt mist resistance and the like, the preparation process is simple, the production cost is low, and the paint is suitable for large-scale industrial application.

The invention provides degradation liquid capable of degrading amine cured epoxy resin, a degradation recovery method and a regeneration method of the amine cured epoxy resin. The degradation liquid comprises an amine compound, an inorganic alkali solution and water. Wherein the ratio of the amine compound is 15%-30%, the ratio of the inorganic alkali solution is 6%-20%, and the balance is water; the amine compound comprises monoethanolamine, diethylenetriamine and triethylene tetramine in a volume ratio of 1: (1-2): (1-2). In the degradation liquid disclosed by the invention, monoethanolamine realizes amidation of degradable weak bonds in an epoxy resin cured substance under the promotion of diethylenetriamine and triethylene tetramine, and realizes degradation of amine cured epoxy resin; the degradation liquid provided by the invention can be used for rapidly and completely degrading a degradable epoxy resin cured product at a relatively low degradation temperature (about 100 DEG C), the degradation product is simply separated and purified to resynthesize the degradable epoxy resin, and the degradation liquid can be recycled through simple distillation.

The invention discloses a modification method and application of double-layer impregnated modified aramid fiber, and the double-layer impregnated modified aramid fiber is prepared by the following steps: reacting hexamethylene diisocyanate and glycerol triglycidyl ether in a water phase to form a first-layer impregnation liquid, and carrying out first-layer impregnation modification on aramid fiber; and forming a second-layer impregnation liquid from ethylene glycol diglycidyl ether, diethylenetriamine, glycidyl methacrylate and butadiene-vinylpyridine rubber latex, performing second-layer impregnation modification on the aramid fibers, drying after double-layer modification to obtain double-layer impregnation modified aramid fibers, and blending and vulcanizing the double-layer impregnation modified aramid fibers and rubber to obtain the rubber-modified aramid fibers. The modified aramid fiber reinforced butadiene styrene rubber composite material can be prepared. By designing a two-step dipping treatment system containing isocyanate and epoxy bifunctional groups, efficient chemical modification of the aramid fiber surface is realized, and a good reaction interface with a rubber matrix is endowed.

The invention relates to the technical field of oilfield chemistry, and discloses an emulsifier, a response agent, a thick oil viscosity reduction method and application. The emulsifier is prepared from nano aluminum oxide, zwitterionic polyacrylamide and alkyl diethylenetriamine according to the mass ratio of 1 to (0.1 to 3) to (7 to 25); wherein the average particle size of the nano aluminum oxide is 30 to 300 nm. When the emulsifier provided by the invention is used for reducing the viscosity of the heavy oil, a stable emulsion can be obtained in the presence of CO2, quick demulsification can be realized by discharging CO2, the stability and quick response effect can still be kept after multiple cycles, and the emulsifier is particularly suitable for reducing the viscosity of the heavy oil.

The invention provides a diesel oil anti-wear agent and a preparation process thereof, and belongs to the technical field of diesel oil additives, and the preparation process comprises the following steps: mixing and stirring diisooctyl maleate and xylene, adding diethylenetriamine and deionized water, carrying out heating reaction, adding toluene, 4-(aminomethyl) pyridine and ethylene oxide, carrying out mixing reaction, filtering, washing, and drying to obtain the diesel oil anti-wear agent. The pyridinium-based polyester hollow capsule is prepared; the preparation method comprises the following steps: mixing xylene, catechol, ethylene phosphonic acid, ammonium persulfate and deionized water, heating, dispersing in cyclohexane, adding polyvinyl alcohol, octadecyl methacrylate and azodiisobutyronitrile, mixing and reacting to obtain catechol phosphonate nano colloidal particles; mixing and stirring the fatty acid ester solution, the oleoyl fluorocarbon copolymer and the pyridinium-based polyester hollow capsule, adding the catechol phosphonate nano colloidal particles, continuously stirring, performing ultrasonic treatment, and degassing to obtain the diesel oil anti-wear agent. The diesel oil antiwear agent can improve the antiwear property and demulsibility of the diesel oil antiwear agent.

The application belongs to the field of new material preparation, and particularly relates to a preparation method of amino-modified biochar / SiO2 composite aerogel. The application prepares cellulose / SiO2 composite aerogel by taking cellulose as a template and tetraethyl orthosilicate as a silicon source, obtains biochar / SiO2 composite aerogel after high-temperature calcination, and then carries out amino modification on the biochar / SiO2 composite aerogel by using a polymer obtained by cross-linking reaction of 3-glycidoxypropyltrimethoxysilane and diethylenetriamine, to obtain amino-modified biochar / SiO2 composite aerogel. The amino-modified biochar / SiO2 composite aerogel prepared by the application has high selectivity for CO2 adsorption, and the preparation process is simple.

The invention provides a preparation method of an intercalated expanded graphite catalyst for catalyzing ozone, the catalyst and application, and belongs to the technical field of graphite materials. Firstly, expanded graphite is subjected to pre-oxidation treatment, the interlayer distance of the expanded graphite is increased, then the pretreated expanded graphite is subjected to intercalation and oxidation through an intercalation substance, an ion pair compound of trityl carbocation and heteropolyanion [P (Mo3O10) 4] 3 <-> with negative electricity is introduced into the interlayer of the expanded graphite, the compound is stably intercalated between the graphite layers, and the expanded graphite is prepared. Organic pollutants and ozone molecules in the wastewater are adsorbed, and the effective collision probability and the reaction rate between the ozone molecules and the organic pollutants are improved; finally, amine substances diethylenetriamine and triethylenetetramine are used for further treating the expanded graphite, and hydrogen bonds are combined with organic compounds such as phenols, so that the adsorption performance of the graphite is improved. The prepared catalyst is combined with ozone to realize good removal of tetracycline, phenol and COD (Chemical Oxygen Demand) in wastewater.

The invention relates to the technical field of radiotherapy auxiliary instruments, in particular to an injectable calcium sodium alginate hydrogel spacer for radiotherapy and a preparation method of the injectable calcium sodium alginate hydrogel spacer. Nano calcium carbonate is used as an adjusting switch, an adjustable mechanical and degradation performance foundation of the hydrogel is laid, and the material is endowed with unique bifunctional characteristics through the synergistic effect of the nano calcium carbonate, a contrast agent iodized oil and a degradation liquid diethylenetriamine pentaacetic acid. The hydrogel can quickly form gel after being injected, keeps long-term structural stability and clear CT imaging capability in vivo, and can monitor the position and form of the hydrogel in a lossless manner; and when the radiotherapy period is finished, the on-demand and rapid degradation of the hydrogel can be realized only by injecting the diethylenetriamine pentaacetic acid, so that the risk of long-term retention is avoided. In-vitro and in-vivo experiments prove that the material has good biocompatibility, can significantly reduce the radiation dose of normal tissues such as rectum and the like, realizes the technical span from invisibility and difficult degradation to visibility and degradability, and has great clinical transformation value.

The invention belongs to the technical field of chemical production, aims to solve the problem of catalyst deactivation caused by crystallization and wrapping in the existing hydrogenated bisphenol A (HBPA) production process, and provides a star polymer for inhibiting crystallization and wrapping in the HBPA production process as well as a preparation method and application thereof. The star polymer provided by the invention takes a polyfunctional group compound (such as pentaerythritol and diethylenetriamine) as a core, a polyacrylic acid main chain with the molecular weight of 5,000-20,000 g / mol is extended, a polyethylene glycol side chain with the molecular weight of 500-2,000 g / mol and the grafting rate of 20%-50% is grafted on the main chain, and through the hydrogen-bond interaction of a carboxylic acid group and HBPA crystals and the steric hindrance effect of the polyethylene glycol side chain, the molecular weight of the HBPA crystals is increased, so that the molecular weight of the HBPA crystals is increased, and the molecular weight of the HBPA crystals is increased. Devitrification wrapping is efficiently inhibited. The invention develops a method which is efficient and environment-friendly and does not introduce new impurities, is used for inhibiting the crystallization wrapping phenomenon in the hydrogenated bisphenol A production process, and has important industrial application value.

The invention relates to the technical field of composite films for BIB packaging inner bags, and discloses a high-barrier single-material sterile BIB packaging bag and a preparation process thereof, the preparation process comprises the following steps: using vanillin, 3-bromopropene, gallic acid, diethylenetriamine and 1, 3-acetonedicarboxylic acid as raw materials to prepare a gallic acid type grafting monomer; the preparation method comprises the following steps: carrying out melt grafting modification treatment on LDPE (Low-Density Polyethylene) resin by using a gallic acid type grafting monomer, and compounding with graphene oxide through pi-pi accumulation action and hydrogen-bond interaction to prepare the graphene-polyethylene composite master batch with an antioxidant function; the preparation method comprises the following steps: preparing a polyethylene master batch, introducing the master batch into a seven-layer co-extruded film to prepare a polyethylene co-extruded film, and preparing the high-barrier single-material sterile BIB packaging bag by taking the co-extruded film as a raw material of an inner bag of the BIB packaging bag. The polyethylene co-extruded film prepared by the invention still shows excellent mechanical properties and barrier properties after being treated by a radiation sterilization technology, and can be used instead of an existing aluminized polyester bag.

The invention discloses amido-modified hypercrosslinked resin, a preparation method thereof and application of the amido-modified hypercrosslinked resin to adsorption of chlorine-containing VOCs (Volatile Organic Compounds). The preparation method comprises the following steps: chloromethylation: swelling hypercrosslinked NDA-88 resin in 1, 2-dichloroethane, adding anhydrous FeCl3 as a catalyst, and carrying out chloromethylation reaction at 35-40 DEG C to obtain chloromethylated resin; and amination: mixing the chloromethylated resin with an amination reagent diethylenetriamine, carrying out amination reaction at 140-150 DEG C, and carrying out post-treatment to obtain the amino modified hypercrosslinked resin. The amino-modified hypercrosslinked resin has high adsorption capacity and long penetration time for chlorine-containing VOCs (Volatile Organic Compounds) such as dichloromethane, chlorobenzene and the like, is stable in performance under the relative humidity of 50%, and is small in adsorption performance attenuation after multiple times of thermal regeneration. The resin is simple in preparation method, excellent in performance and suitable for efficient purification treatment of industrial chlorine-containing VOCs waste gas.

This invention provides a quadruple ion-coupled erosion-protected concrete and its preparation method, relating to the field of special concrete materials technology. The concrete comprises basic components and functional admixtures. The basic components include cementitious materials, aggregates, and water. The functional admixtures include a coupling ion locking agent, a dual-interface film-forming aid, and a salt-expansion-resistant crack-resistant agent. The coupling ion locking agent includes calcined calcium aluminum hydrotalcite and diethylenetriamine pentacarboxylate; the dual-interface film-forming aid includes isobutyltriethoxysilane and lithium silicate; and the salt-expansion-resistant crack-resistant agent includes calcium sulfoaluminate expansion agent and lightly calcined magnesium oxide. The three admixtures work synergistically from three dimensions: active ion solidification, in-situ interface shielding, and full-cycle volume compensation, achieving simultaneous solidification of the four erosion ions, continuous blocking of penetration channels, and effective offsetting of salt crystallization expansion stress. This ensures the long-term safe service of the concrete under extreme conditions of high water pressure, high humidity, alternating wet and dry conditions, and multi-ion coupling erosion.

The invention provides polyester resin for a transparent powder coating with excellent adhesive force and leveling as well as a preparation method and application of the polyester resin, and belongs to the technical field of powder coatings. The polyester resin is mainly prepared by taking diethylenetriamine pentaacetic acid, triethyl chlorosilane, 1, 6-hexanediol, N, N-diisopropylethanolamine, 2, 2-dimethyl propanol, neopentyl glycol, 3, 3-tetramethylene glutaric anhydride, 1, 4-cyclohexanedimethanol and the like as raw materials through polymerization. The obtained polyester resin chain segment has many branched structures, the number of amino groups and ester groups in the branched structures is large, the softening point is low, the low-temperature melting fluidity is good, the transparency is high, the adhesive force with a base material is good, then high-functionality diethylenetriamine pentaacetic acid is adopted for carboxyl end capping, the terminal carboxyl functionality is high, the curing activity is high, and the curing effect is good. After being cured with E-12 epoxy resin at low temperature, a coating film is good in leveling property and high in transparency, and can be used in the fields of thermosensitive base materials which are not easy to adhere, such as thin glass materials and the like.

The invention discloses a two-phase carbon dioxide absorbent based on ionic liquid and application of the two-phase carbon dioxide absorbent. The two-phase carbon dioxide absorbent based on the ionic liquid is prepared from 9 to 21 parts of tetramethyl ammonium hydroxide glutamate, 14 to 21 parts of diethylenetriamine, 50 to 65 parts of N, N-dimethylethanolamine and 9 to 11 parts of water. According to the absorbent, the CO2 loading capacity is improved through the synergistic effect of an alkaline site of the ionic liquid and amine in the absorption stage, and an acid site of the ionic liquid serves as a built-in proton donor in the regeneration stage to promote decomposition of an absorption product, so that high absorption capacity and low regeneration energy consumption are synergistically achieved. The absorbent is high in COO absorption capacity, low in regeneration energy consumption, low in regeneration temperature and good in cycling stability, and an innovative solution is provided for solving the high-energy-consumption bottleneck of a traditional amine method carbon capture technology.

This invention provides a copper adhesion inhibitor that inhibits copper adhesion to steel materials and suppresses the deterioration of the color tone of the steel material surface when pickling steel materials in a hydrochloric acid cleaning solution containing a large amount of copper ions. [Solution] A copper adhesion inhibitor for addition to a pickling solution for steel materials, characterized by comprising one or more of the following: polyallylamine, diallylamine-sulfur dioxide copolymer or a salt thereof, methyldiallylamine-sulfur dioxide copolymer or a salt thereof, dialkyldiallylammonium-sulfur dioxide copolymer, polycondensate of dicyandiamide and diethylenetriamine or a salt thereof.

The invention discloses a monatomic palladium-loaded titanium dioxide graded nanosphere for catalyzing magnesium hydride, and belongs to the technical field of hydrogen storage alloys and preparation thereof. The magnesium-based hydrogen storage material solves the problem that the existing magnesium-based hydrogen storage material has poor dynamic and thermodynamic properties and cannot meet the actual application requirements. The preparation method comprises the following steps: firstly, taking isopropyl titanate, diethylenetriamine and isopropanol as raw materials, preparing HA-TiO2 powder which exposes a large amount of {001} high-activity crystal faces by adopting a hydrothermal method, and further uniformly distributing monatomic Pd on the surface of the HA-TiO2 powder by adopting a chemical impregnation-reduction method to obtain Pd / TiO2 powder. The obtained Pd / TiO2 powder is used as a catalyst for catalyzing MgH2 hydrogen storage, the dehydrogenation temperature of a hydrogen storage material can be remarkably reduced, the hydrogen absorption / desorption rate is increased, and rapid hydrogen absorption at the room temperature is achieved.

This invention discloses a phosphorus-free composite polyamine boiler water treatment agent, its preparation method, and its application, belonging to the fields of chemical and water treatment technology. The water treatment agent is made from the following raw materials in parts by weight: 9-15 parts diethylenetriamine, 1-6 parts N-9-octadecene-1,3-propanediamine, 18-20 parts tannin, 1-6 parts cyclohexylamine, 10-24 parts polycarboxylic acid, and 30-60 parts deionized water. In preparation, the polycarboxylic acid is dissolved in deionized water, and N-9-octadecene-1,3-propanediamine, cyclohexylamine, diethylenetriamine, and tannin are added sequentially. After stirring at room temperature, the mixture is allowed to stand. The water treatment agent of this invention is phosphorus-free and has the functions of scale inhibition, corrosion inhibition, passivation, pre-filming, deoxygenation, desiliconization, scale dispersion and online removal of steam turbine salt deposits. It has a scale inhibition rate of ≥98%, a corrosion inhibition rate of ≤0.025mm / a and a deoxygenation efficiency of ≥97%. It can be adapted to high-pressure, subcritical and supercritical power plant boilers, is easy to prepare and suitable for industrial application.

This invention relates to the field of lubricant preparation technology and provides a method for preparing a neutralization-free modified amine ethoxylated compound lubricant. The method includes the preparation of oligomeric amides and alkoxylated adducts. An oligomer is formed by condensing a dimer acid with diethylenetriamine to form an amide. Subsequently, the oligomer is modified with ethylene oxide and propylene oxide, alkoxylating the secondary amino groups in the diethylenetriamine. The alkoxylated secondary amino groups act as an alkaline neutralizer, while the dimer acid replaces the fatty acid as a lubricant. By adjusting the ethylene oxide-propylene oxide ratio and polymerization structure, products with emulsifying functions for semi-synthetic cutting fluids and low-foaming products for fully synthetic cutting fluids can be synthesized. This reduces preparation costs and environmental pollution, and allows for the preparation of high-performance adducts suitable for different application areas. It also improves product quality and stability, resulting in a promising market.

This invention discloses a solid sodium aminosulfonate β-H elimination promoter, its preparation method, and its application, relating to the technical field of β-H elimination promoters. The technical solution is as follows: S1, diethylenetriamine is dissolved in an organic solvent; S2, chlorosulfonic acid organic solution is added dropwise to the diethylenetriamine organic solution at 0-10℃ to carry out the reaction; after the addition is complete, the temperature is raised to continue the reaction; S3, the white solid generated by the reaction is filtered and washed with chloroform and ethanol respectively. The washed white solid is poured into anhydrous methanol and dispersed evenly. The reaction temperature is lowered to 0℃, sodium hydroxide is added for neutralization, and the solvent is removed by vacuum distillation. The resulting pale yellow solid is washed with ethanol and finally dried under vacuum to obtain the solid sodium aminosulfonate β-H elimination promoter. The solid sodium aminosulfonate β-H elimination promoter prepared by this invention has advantages such as high metal salt content, strong alkalinity, and easy separation, making it a promising additive for industrial application.

Disclosed is a novel room-temperature curable bio-based epoxy vitrimer with a simple design of the chemical structure. A hempseed oil-derived glycidyl ester type epoxy (HOEP) was synthesized and then blended with a bisphenol A epoxy (DER331) to manipulate the properties of the resulting vitrimer s. An aliphatic amine hardener, diethylenetriamine (DETA), was selected as hardener to realize the room temperature curing in presence of triethanolamine (TEOA) as the catalyst. Unlike the traditional glycidyl ether epoxy-amine the thermosets which are based on sable C—N and ether linkages, the epoxy vitrimer herein includes ester bonds with HOEP and hydroxyls formed from the reaction of amine and epoxy in its cross-linked network. Dynamic transesterification (DTER) between the ester bonds and hydroxyls take place at elevated temperatures, imparting the vitrimer significant stress relaxation behavior and repairability. This provided a viable method to produce room temperature curable epoxy vitrimer s.

The invention discloses a novel bismuth-based chelate CT contrast agent and a preparation method and application thereof. The synthesis method comprises the following steps: reacting 2, 6-pyridine dimethyl carbinol with thionyl chloride to obtain 2, 6-bis (chloromethyl) pyridine; the preparation method comprises the following steps: carrying out a heating reaction on 2-(4-methylphenyl)-1, 2, 4-triazine-2-ketone, N, N ', N'-tri (p-toluenesulfonyl) diethylenetriamine and an inorganic base in a solvent, and carrying out concentrated sulfuric acid deprotection to obtain an intermediate pyclen; the preparation method comprises the following steps: heating and reacting pyrene and halogenated carboxylic ester in a polar organic solvent under an alkaline condition, and hydrolyzing to obtain a ligand product; and heating and chelating the ligand product and a bismuth agent to prepare the target bismuth-based chelate. Laboratory large-scale preparation of the small-molecule bismuth-based chelate CT contrast agent is achieved, and the prepared nonionic contrast agent has low osmotic pressure, high stability, high water solubility and good biological safety and is used for CT imaging of digestion, urinary and circulatory systems.

A method of recovering iridium in a platinum group metal refining process by dissolving iridium from a solid iridium containing material into an aqueous solvent to produce an iridium containing solution, wherein the solution is acidic and / or is acidified by addition of an acid (e.g. HCl) after dissolution of the iridium; adding an aliphatic polyamine (e.g. diethylenetriamine or ethylenediamine) to the solution to precipitate the iridium as an iridium polyamine salt; and separating the precipitated iridium polyamine salt from the solution. A majority of the iridium is dissolved in its +3 oxidation state and remains in this state throughout the precipitation and separation steps. The sold iridium (e.g. an iridate or an iridium oxide) can be reduced from its +4 oxidation state when it dissolved using an oxalate or oxalic acid reducing agent. The solution comprises substantially no rhodium or ruthenium.

The invention belongs to the technical field of chemical production, aims to solve the problem of catalyst deactivation caused by crystallization and wrapping in the existing hydrogenated bisphenol A (HBPA) production process, and provides a star polymer for inhibiting crystallization and wrapping in the HBPA production process as well as a preparation method and application thereof. The star polymer provided by the invention takes a polyfunctional group compound (such as pentaerythritol and diethylenetriamine) as a core, a polyacrylic acid main chain with the molecular weight of 5,000-20,000 g / mol is extended, a polyethylene glycol side chain with the molecular weight of 500-2,000 g / mol and the grafting rate of 20%-50% is grafted on the main chain, and through the hydrogen-bond interaction of a carboxylic acid group and HBPA crystals and the steric hindrance effect of the polyethylene glycol side chain, the molecular weight of the HBPA crystals is increased, so that the molecular weight of the HBPA crystals is increased, and the molecular weight of the HBPA crystals is increased. Devitrification wrapping is efficiently inhibited. The invention develops a method which is efficient and environment-friendly and does not introduce new impurities, is used for inhibiting the crystallization wrapping phenomenon in the hydrogenated bisphenol A production process, and has important industrial application value.

The application provides a preparation method, a catalyst and application of an intercalation expanded graphite catalyst for catalyzing ozone, and belongs to the technical field of graphite materials. First, the expanded graphite is subjected to pre-oxidation treatment to increase the interlayer distance of the expanded graphite, then the pretreated expanded graphite is subjected to intercalation and oxidation through an intercalation substance, and an ion pair compound of triphenylmethyl carbon cation and negatively charged heteropolyanion [P(Mo3O 10 )4] 3‑ is introduced between the layers of the expanded graphite, the compound is stably intercalated between the layers of the graphite, organic pollutants and ozone molecules in waste water are adsorbed, and the effective collision probability and reaction rate between ozone molecules and organic pollutants are improved; finally, the expanded graphite is further treated by using amine substances diethylenetriamine and triethylenetetramine, hydrogen bonds are combined with organic compounds such as phenols, and the adsorption performance of the graphite is improved. The catalyst prepared by the application realizes good removal of tetracycline, phenol and COD in waste water in combination with ozone.