67 results about "2-Vinylpyridine" patented technology

The invention discloses a composite hydrate inhibitor and application thereof. The provided composite hydrate inhibitor comprises a copolymer and an anti-aggregation agent; the copolymer is selected from at least one of the following substances: poly (N-vinyl pyrrolidone-2-vinyl pyridine) and poly (N-vinyl caprolactam-2-vinyl pyridine); and the anti-aggregation agent is a quaternary ammonium saltcompound. When the series of copolymer and the anti-aggregation agent are interacted, the composite hydrate inhibitor has good hydrate generation inhibiting performance. The hydrate inhibitor is in aliquid state, and can be used in the range that the water content is 10 to 80 weight percent, the pressure is 1.5 to 70MPa and the temperature is 20 DEG C below zero to 25 DEG C. The hydrate inhibitor cannot be limited by super-cooling degree, and is suitable for oil and water coexistence or oil-gas field and crude oil recovery; and particularly under the condition of high water content, the hydrate nucleation and aggregation inhibiting effects of the inhibitor can be fully exerted. The inhibitor has the advantages of high efficiency, economical efficiency, low dose and good biodegradability,and has good application prospect.

The invention relates to a method for synthesizing and preparing 2-vinyl pyridine by synthesizing 2-methyl pyridine and formaldehyde, which comprises the following steps of: adding the raw materials 2-methyl pyridine and formaldehyde (36%) into a high pressure reactor according to the weight ratio of 1: 0.03, stirring and heating for reaction to obtain 2-hydroxyethyl pyridine solution; slowly adding the obtained 2-hydroxyethyl pyridine solution into a dehydration kettle filled with sodium hydroxide (50%) solution through a measuring tank (1 ton) to obtain the crude product 2-vinyl pyridine; and sending the obtained crude product 2-vinyl pyridine into a washing kettle through a pipeline, adding sodium hydroxide (95%) solution into the washing kettle, and carrying out cut fraction on the crude product 2-vinyl pyridine which is separated by washing to obtain the 2-vinyl pyridine with the gas phase chromatography test content of more than 98.5%. The method adopts novel catalyst, so that the unit comprehensive energy consumption is reduced by 20%; the production process is automatically controlled, the product purity is greatly improved, and the product content reaches up to more than 98.5%; and the whole process route is clean and environment-friendly.

The invention relates to a preparation method of water soluble fluorescent nano-particles which are even and adjustable in size and have fluorescent marks; the preparation method comprises the following detailed steps of: mixing a segmented copolymer, a fluorescent material and an organic solvent in a certain ratio, heating the mixed solution and then holding for a certain time, adding a quanternization reagent in the obtained solution, heating and holding for a certain time; centrifuging, re-dispersing precipitate in water, and heating at a certain temperature, thereby obtaining the water soluble fluorescent nano-particles which are even and adjustable in size and have fluorescent marks, wherein the copolymer consists of a hydrophobic chain and a hydrophilic chain, preferably, the hydrophobic chain consists of the hydrophobic chain and polymethyl methacrylate, and the hydrophilic chain consists of poly(2-vinyl pyridine), poly(4-vinyl pyridine) and polymethyl methacrylate dimethylamino ethyl ester; the fluorescent nano-particles obtained by the method are even in size and have the hygrometric state particle size effectively adjustable within the range of 50nm to 400nm; and the method is simple, short in technological process, excellent in fluorescence effect and low in cost, and is suitable for large-scale production.

The invention relates to a preparation method of a catalyst for synthesizing propionic acid by ethanol carbonylation, and an application of the catalyst. The catalyst is prepared by the following steps of: taking 2-vinyl pyridine and acraldehyde as monomers, benzene as a solvent and azodiisobutyronitrile as an initiator; adopting a free-radical solution polymerization method, and using petroleum ether for precipitation; carrying out vacuum drying to be at constant weight at the temperature of 60-80 DEG C to obtain a catalyst ligand; dissolving the obtained catalyst ligand in acetic acid, adding dichloro-tetracarbonyl-dirhodium, and carrying out reaction for 10-30min; and adding a precipitator (sodium tetraphenylborate), and continuously stirring for 5-20min to obtain a copolymer rhodium catalyst. The catalyst can be used for catalyzing ethanol carbonylation to synthesize the propionic acid with high selectivity.

The invention discloses an iridium picolinate complex catalyst for synthesizing acetic acid by methanol carbonylation and a preparation method and an application thereof, a ligand of the catalyst is a copolymer of 2-vinyl pyridine and methyl acrylate, and a copolymer iridium complex catalyst is formed by the complexation reaction with an iridium compound. The preparation method comprises the steps of preparing the ligand of the catalyst, then dissolving 1 part by weight of the copolymer in 10-100 parts by weight of the acetic acid, stirring, heating under reflux, adding the iridium compound which accounts for 3-10% of the weight of the copolymer, carrying out reaction for 10-60min, cooling to the room temperature, using ether for precipitation, filtering and then obtaining a copolymer iridium catalyst. The 1 part by weight of the copolymer is added into the acetic acid solution containing (Ir(CO)2I)2 or (Ir(CO)2Cl)2 under stirring, the feeding is 3-10% of the weight of the copolymer calculated by the weight of iridium, the reaction is carried out for 10-30min under stirring, the ether is used for precipitation, and the copolymer iridium catalyst is obtained by filtering. The copolymer iridium catalyst is used for preparing the acetic acid by methanol carbonylation reaction and has good catalytic performance.

The invention discloses a molecular imprinting polymer filter paper for absorbing penicillin. The filter paper is prepared by following steps: (1) dissolving penicillin and monomer in acetonitrile, sealing, standing still for at least 6 hours, adding an initiator and a cross-linking agent, introducing nitrogen to remove the oxygen in the solution; (2) putting a filter paper into the solution prepared in the step (1), oscillating for at least 3 hours, taking the filter paper out, putting the filter paper in a dry container, sealing the container, putting the container in a constant temperature incubator with a temperature of 50 to 80 DEG C, and having polymerization reaction for 8 to 24 hours; (3) putting the filter paper prepared in the step (2) into a mixed solution of methanol and acetic acid, oscillating, washing away the penicillin, non-polymerized monomers and cross-linking agent on the filter paper, soaking the filter paper in methanol, washing away acetic acid, and drying so as to obtain the molecular imprinting polymer filter paper for absorbing penicillin. The monomer is a mixture of itaconic acid, acrylamide and 2-vinylpyridine with a mol ratio of 1:1 to 1.5:0.5 to 1, and the cross-linking agent is pentaerythritol tetramethacrylate. The molecular imprinting polymer filter paper for absorbing penicillin is a cheap and high-efficient antibiotic absorption material.

A photonic material capable of reflecting part of the light rays in a wavelength region from near-ultraviolet light to near-infrared light. The photonic material contains a block copolymer including a plurality of different polymer chains connected to one another. Each polymer chain independently forms a portion of an aggregated nanophase separated structure. At least one of the plurality of polymer chains is swelled with a non-volatile solvent. An example of such a photonic material may be a polystyrene-b-poly(2-vinylpyridine) block copolymer whose poly(2-vinylpyridine) phase is swelled with an ionic liquid.

The invention discloses magnetic composite particles and a preparation method and application thereof. The magnetic composite particles are of a core-shell satellite structure, the magnetic composite particles are prepared from silver-shell magnetic beads and gold nanorods, and the surfaces of the silver-shell magnetic beads are combined with the gold nanorods with poly(2-vinylpyridine); the silver-shell magnetic beads are composed of manganese ferrite and silver shells continuously wrapping the manganese ferrite. The preparation method of the magnetic composite particles comprises the steps that 1, the silver-shell magnetic beads are added into a poly(2-vinylpyridine) solution, ultrasonic treatment is conducted, and the poly(2-vinylpyridine) modified silver-shell magnetic beads are obtained; 2, a gold nanorod solution is prepared; 3, the poly(2-vinylpyridine) modified silver-shell magnetic beads and the gold nanorod solution are mixed, an ultrasonic reaction is conducted, the magnetic composite particles are obtained, and the magnetic composite particles can serve as an SERS reinforced substrate for detection application. The magnetic composite particles have the very good magnetic response capability and SERS property, and the preparation method is simple in technology, high in universality and high in applicability.

The invention discloses a preparation method of an adsorbent capable of effectively reducing content of crotonaldehyde in cigarette smoke. Butyraldehyde is taken as a dummy template, methacrylic acid, acrylamide, 2-vinylpyridine or 4-vinylpyridine are taken as functional monomers, methanol is taken as a pore-foaming agent, ethylene glycol dimethacrylate is taken as a cross-linking agent, and a precipitation polymerization method is adopted to synthesize the adsorbent. The surface of the obtained polymer is provided with a large number of spatial structures similar to the structure of a crotonaldehyde molecule and reaction sites, and high selective adsorption performance is provided. The addition volume can be adjusted freely as required when the adsorbent is applied to a complex filter. When the addition volume is 10mg per filter, the reduction rate of the crotonaldehyde in the smoke is 20.9%, and the relative reduction rate of tar is 7.5%; and when the addition volume is 20mg per filter, the reduction rate of the crotonaldehyde in the smoke is 39.5%, the relative reduction rate of the tar is 17.7%, and the selective adsorption effect on crotonaldehyde is quite obvious.

The invention discloses a preparation method of orthographic optimizing betahistine hydrochloride, and relates to the field of drug preparation. The preparation method includes the steps: adding raw materials into a reaction bottle according to the feeding ratio (molar ratio) of 2-methylpyridine to paraformaldehyde of 1:0.57, leading in nitrogen, stirring mixture for 20 hours at the temperature of125 DEG C and at 4 barometric pressure, performing reduced pressure distillation, and collecting distillation cut at the temperature of 130-145 DEG C and under the pressure of 16mm mercury columns toobtain light-yellow oily 2-hydroxyethyl pyridine; adding the 2-hydroxyethyl pyridine into a three-opening bottle, adding sodium hydroxide according to the feeding ratio of 2-(2-Hydroxyethyl)pyridineto sodium hydroxide of 1:0.05, heating the mixture to reach 95-100 DEG C, stirring the mixture for 2 hours, removing a water layer, performing reduced pressure distillation on an oil layer, and collecting the distillation cut at the temperature of 65-70 DEG C and under the pressure of 17mm mercury columns to obtain 2-vinylpyridine. The preparation method is simple in technological process, safe tooperate and mild in reaction, production efficiency and product quality can be greatly improved, and production cost is reduced.

The invention discloses a dispersing agent special for a pesticide water suspension agent and a preparation method thereof, relates to the technical field of agriculture, and aims to provide the dispersing agent special for the pesticide water suspension agent, which has the advantages of simple operation, low cost and safety and environmentally friendly effect and the preparation method thereof. The dispersing agent special for the pesticide water suspension agent is prepared from the following raw materials in parts by mass: 100 to 600 parts of 2-vinylpyridine, 100 to 900 parts of organic acid, 1000 parts of deionized water, 10 to 150 parts of chain transfer agent, 10 to 150 parts of initiator and 6 to 20 parts of alkali. The dispersing agent special for the pesticide water suspension agent has the characteristic of large molecular weight; the dispersing agent is used as an auxiliary to prepare the pesticide water suspension agent, the dosage of the dispersing agent is little, and the prepared pesticide water suspension agent has good dispersibility and high suspension rate in standard hard water. The dispersing agent special for the pesticide water suspension agent has the advantages of simple preparation process, short production period and low production cost, has no environmental pollution in the production process, and is suitable for industrial scale production.

The invention discloses a CGC type aminofluorene rare-earth metal catalyst and a preparation method and application thereof, and belongs to the technical field of catalysts. The catalyst has three structural formulas. The novel CGC aminofluorene rare-earth metal catalyst can catalyze the homopolymerization or copolymerization of olefins, alkynes, CO2 and polar monomers such as 2-vinylpyridine, 4-vinylpyridine, epoxyalkane or lactone. When the catalyst is applied in catalyzing the polymerization of isoprene, the content of cis 1,4 in the obtained polyisoprene reaches up to 96%. In addition, when the catalyst is applied in catalyzing the polymerization of styrene, syndiotactic polystyrene with rrrr = 100% is obtained. Especially when the catalyst is applied in the polymerization of myrcene,the content of cis 1,4 in the obtained polymyrcene reaches up to 100%. The catalyst of the invention can polymerize polar monomers and has good catalytic activity and selectivity.

The invention discloses a method for preparing an adsorbent for selectively adsorbing crotonaldehyde in cigarette smoke. N-butanal is used as a dummy template, a methacrylic acid, acrylamide, 2-vinylpyridine and 4-vinylpyridine are used as functional monomers, methanol, 2- chloromethane, chloroform and tetrahydrofuran are used as porogen solvents, ethylene glycol dimethyl acrylic ester is used as a cross-linking agent, silica gel is used as a sacrifice monomer, and a polymer which has a selective adsorption function on the crotonaldehyde is synthesized by a sacrificial silica-gel method. The adsorbent has the advantages that the original shape of a silica gel microsphere is maintained, pore volume and specific surface area are larger, reaction sites are numerous, and high selectivity and adsorption capacity on the crotonaldehyde are achieved. The adsorbent is applied to ternary composite filter rods, when the addition amount is 10mg per rod, the reduction rate of the crotonaldehyde is 21.9%, the relative reduction rate of relative tar is 10.1%, and when the addition amount is 20mg per rod, the reduction rate of the crotonaldehyde is 46.0%, and the relative reduction rate of the relative tar is 25.8%.

The invention provides a method for preparing 2-vinylpyridine. The 2-vinylpyridine is mainly prepared from 2-picoline and formaldehyde. The process for synthesizing the 2-vinylpyridine comprises 'two-step' and 'one-step' production processes, and comprises the steps of condensing 2-picoline and formaldehyde to produce hydroxyethyl pyritine; and dehydrating the hydroxyethyl pyritine at a certain temperature in the action of a catalyst to generate the 2-vinylpyridine. The 'one-step' production process is adopted, 2-vinylpyridine is further generated at a certain temperature under the action of an acid catalyst by adopting 2-picoline and formaldehyde as raw materials, the process flow is simple, the yield is high, and the consumption of raw materials, auxiliary materials and energy of the 'one-step' method is superior to those of the 'two-step' method.

A bimetal Rh-Li catalyst for the hydroxylation reaction of methanol to obtain acetic acid or the carbonylating reaction of methyl acetate to obtain ethylanhydride is disclosed, which has 3 basic structures and features high activity, selectivity and stability. Its preparing process includes such steps as copolymerization of 2-vinylpyridine or 4-vinylpyridine on acrylic acid, acrylate, or maleic acid anhydride, hydrolzying by strong alkali, acting on lithium hydroxide to obtain ligand, reacting on Rh compound and coordination.

The invention provides a post-ether carbon-four polymerized catalyst which has a structure represented by a formula (I), wherein n is an integer ranged from 1-3,000. The catalyst is prepared by adding a monomer 2-vinylpyridine and vinylidene fluoride in a syrene cation exchange resin polymerization process for polymerization and then performing sulfonation. The catalyst disclosed by the invention is high in stability, and a liquid product is high in yield; the catalyst can keep extremely high catalysis activity due to long-time running. The invention also provides a preparation method for the catalyst and application of the catalyst in post-ether carbon-four olefin polymerized production of high-octane petrol or isobutene dimerization production of isooctane.

The invention provides a photovoltaic device containing pyridine polymer. The pyridine polymer has a molecular structure as shown in formula (1). The material takes poly(2-vinylpyridine) as the core.The electron transport material has high electronic transmission performance and light transmission, excellent solubility, good self-assembly performance and stability, and good processability in solution. The electron transport material can be used as both the electron transport material of all-organic solar cells and the electron transport material of perovskite solar cells, and has huge application value and development potential in the field of photovoltaic devices such as organic solar cells.

The invention discloses a high-efficiency environment-friendly 2-vinyl pyridine preparation method. According to the method, 2-hydroxyethyl pyridine and a catalyst are subjected to reactive distillation at a pressure equivalent to 60-160mmHg, such that a mixed liquid of 2-vinyl pyridine and water is continuously produced by distillation; strong alkali is added, and the mixture is allowed to stand and is stratified, such that a 2-vinyl pyridine-rich oil layer is obtained; reduced-pressure distillation is carried out, and a fraction at a temperature of 30-130 DEG C is collected, such that a 2-vinyl pyridine finished product is obtained. According to the preparation method, reaction raw materials and optimal dose ratios, and especially the optimal catalyst and a dose thereof are screened through a large amount of experiments. The optimal reaction temperature, reaction time and reaction pressure are also screened through large amounts of experiments. The entire process is reasonable; environment pollution is low; reaction temperature is low; reaction time is short; reaction efficiency is high; requirements on equipment is low; production cost is low; yield is high; and produced 2-vinyl pyridine has high purity. With the method, various deficiencies of prior arts can be overcome.

The invention discloses macroporous weak-base anion-exchange resin and a preparation method thereof. The macroporous weak-base anion-exchange resin comprises the following components: an oil phase anda water phase, wherein the oil phase is 60-80 parts of a 2-vinylpyridine monomer, 25-35 parts of a divinylbenzene cross-linking agent, 100-150% of polyurethane and modified hydroxymethyl cellulose asa mixed pore-foaming agent by monomer weight, and 1.5-3% of benzoyl peroxide and azodiisobutyronitrile as a mixed initiator by monomer weight; and the water phase is 480-600 parts of deionized water,2-3 parts of a hydroxypropyl methyl cellulose dispersing agent, and 38-42 parts of a sodium nitrite salting-out agent. The preparation method thereof comprises the following steps: adding the oil phase to the water phase, stirring, varying a temperature, and performing a curing reaction. The prepared macroporous weak-base anion-exchange resin has higher adsorptive selectivity, larger adsorptioncapacity and good heat resistance, and is capable of efficiently removing harmful or degradation-resistant anions of an arsenate ion, an aromatic sulfonate ion, a fumaric acid radical ion and the like, and prolonging service life thereof.

The invention relates to a surface-active microsphere, as well as the preparation and the application thereof. The surface active microsphere is characterized in that the mother sphere of the surface active microsphere is formed by copolymerizing substances selected from the following monomers: styrene, divinylbenzene, methyl methacrylate, isobutyl methacrylate, n-butyl methacrylate, methyl acrylate, 4-vinylpyridine, 2-vinylpyridine, ethyl acrylate, n-butyl acrylate, acrylonitrile or allyl methacrylate; and the mother sphere is subjected to activation modification treatment. No specially appointed dispersant is used in the reaction of the invention, and the product can be easily processed cleanly. The surface-active microsphere can be used as an electrophoretic agent or a thermosensitive phase-transfer material.

The invention discloses a preparation method of an adsorbing agent capable of selectively lowering crotonaldehyde content in cigarette smoke. The preparation method adopts n-butanal as a fake template, adopts alpha-methacrylic acid, acrylamide, 2-vinylpyridine or 4-vinylpyridine as a functional monomer, adopts methanol as porogen solvent, adopts ethylene glycol dimethyl acrylic ester as cross-linking agent, and adopts mass polymerization to synthetize the adsorbing agent. When the adsorbing agent is applied to composite plugs, the additive amount can be randomly adjusted according to requirements. When the additive amount is 10mg per plug, compared with a comparison sample, reduction rate of the crotonaldehyde in smoke is 20.3%; and compared with tar, the relative reduction rate of the crotonaldehyde in smoke is 6.9%. When the additive amount is 2mg per plug, compared with a comparison sample, reduction rate of the crotonaldehyde in smoke is 31.0%; and compared with tar, the relative reduction rate of the crotonaldehyde in smoke is 10.7%. The effect of selectively reducing crotonaldehyde is very obvious, and the method can be used for cigarette production.