214 results about "Styrene oxide" patented technology

The invention relates to block-copolymeric polyalkylene oxides containing styrene oxide, obtained by alkoxylation, and their use as low-foam pigment wetting agents in aqueous pigment pastes with or without cosolvent and in aqueous and low-solvent coating materials and printing inks.

The invention discloses a catalytic system used for synthesizing cyclic carbonate ester. The catalytic system comprises a catalyst with structural unit shown in formula I and quaternary ammonium salt shown in a general structure of formula II, wherein n is equal to 1-4 in the general structure of formula II. The catalytic system is suitable for catalyzing the reaction system in which carbon dioxide reacts with epoxy compound to synthesize the cyclic carbonate ester, in the reaction system, all the various epoxy compounds are applicable to the method, such as propylene oxide, epoxy chloropropane, styrene oxide, 2,3-glycidyl phenyl ether or cyclohexene oxide; the reaction temperature is 30-80 DEG C; the pressure of carbon dioxide is 2-12 MPa; and reaction time is 1-24 h. Compared with the conventional method, the catalytic system has the advantages of mild reaction condition, high recovery rate and high selectivity, and reuse of the major catalyst metal-organic coordination polymer (MOF-5) by simple filtration. Therefore, the catalytic system has strong industrial application value.

The invention discloses a low-carrying-capacity high-activity supported gold catalyst using hydrotalcite as a carrier and a preparation method thereof, which belong to the technical field of catalyst preparation. The preparation method of the supported gold catalyst comprises the following steps of: selecting a hydrotalcite precursor with a higher isoelectric point as the carrier; and using a uniform hydroxyl lattice of the hydrotalcite and different crystal face orientations of the hydrotalcite to ensure that gold atoms with catalytic activity are highly dispersed and are closely anchored on a high-energy crystal face of the hydrotalcite so as to expose more active gold particles. If the catalyst is used for synthesizing phenyl ethylene oxide through catalytic oxidation of styrene, the conversion rate of reactants is high, and the selectivity of products is high.

The invention relates to a preparation method of molecular sieves, in particular to a preparation method of mesoporous-microporous titanium silicalite molecular sieves. The method includes: uniformly mixing tetrapropylammonium hydroxide, tetrabutyl titanate, tetraethyl orthosilicate and deionized water in the mass ratio of 1:20-90:8:1500, reacting at the constant temperature of 35 DEG C prior to mixing with polymethyl vinyl fluoride, and crystallizing for 1 hour at the temperature of 140 DEG C to obtain nano-clusters; and mixing hexadecyl trimethyl ammonium bromide, the deionized water, ammonia water 25% in concentration and the polymethyl vinyl fluoride, crystallizing for 72 hours at the temperature of 120 DEG C to obtain a product, and subjecting the product to suction filtration, washing, drying at the room temperature and roasting for 4 hours at the temperature of 500 DEG C so that the mesoporous-microporous titanium silicalite molecular sieves are obtained. Experimental results show that the mesoporous-microporous titanium silicalite molecular sieves prepared by the method are large in specific surface area, and micropores are reserved in pore walls of mesopores; primary and secondary building units of TS-1 molecular sieves are successfully introduced into the pore walls of the mesoporous molecular sieves; and the mesoporous-microporous titanium silicalite molecular sieves prepared by the method has good selectivity on generation of styrene oxide in epoxidation reaction of styrene.

The invention belongs to the field of magnetic catalysts, and particularly relates to Ag-Fe3O4 magnetic nano-catalysts compounded under the action of polymers and their application in a styrene catalytic epoxidation system. The synthesis method is to use Fe3Cl6·6H2O and AgNO3 as raw materials to synthesize Ag-Fe3O4 composite magnetic nano-catalyst in ethylene glycol system containing NaAc by solvothermal technology with the assistance of polymer PVP; this catalyst can be used to use TBHP as oxidant, Styrene epoxidation system with toluene as solvent. The preparation method of the present invention is simple, the reactants are cheap and easy to obtain, the solvent pollution is small, the synthesis time is low, the catalyst can be conveniently separated from the reaction system under the action of an external magnetic field, and the problem that the non-magnetic nano-catalyst is difficult to recover is solved. The catalyst showed excellent catalytic activity and stability for styrene epoxidation, the yield of ethylene oxide was 84.0%, and there was no deactivation phenomenon after repeated use.

An improved catalytic process for the preparation of epoxides from alkenes using a combination of transition metal salt, an inorganic promoter and an organic additive in absence of solvent or in the presence of a solvent with commercially available hydrogen per oxide has been disclosed. Thus, styrene oxide was prepared at a kilogram scale in 86% isolated yield with purity >95 %.

The invention relates to silicone-containing graft copolymers and to processes for their preparation. In particular, the invention relates to silicone-containing graft copolymers which are obtained by the controlled grafting of olefinic monomers onto a partly styrene oxide-based silicone polyether.

The invention relates to a preparation method of imrecoxib, and a preparation method of an imrecoxib intermediate. The preparation method of the imrecoxib intermediate remarkably improves the yield ofthe intermediate (III). The preparation method of the imrecoxib is characterized in that p-methylsulfonylstyrene oxide used as an initial raw material undergoes nucleophilic ring opening, acylation,oxidation and cyclization to obtain the final product N-n-propyl-3-(4-methylphenyl)-4-(4-methylsulfonylphenyl)-2,5-dihydropyrrol-2-one. The method has the advantages of short route, simplicity in operation, and suitableness for industrial amplified production.

The present invention provides an improved process for preparation of 2-phenyl ethanol. More specifically, the present invention relates to a process for preparing 2-phenyl ethanol by catalytic transfer hydrogenation of styrene oxide, in the presence of a supported transition metal catalyst. The catalyst system comprises of a palladium supported on silica, alumina, clay or charcoal.

The invention discloses an epoxide hydrolase sourced from Phaseolus vulgaris and an application thereof and belongs to the technical field of biology. The invention discloses an epoxide hydrolase gene (pveh2) sourced from a leguminous plant, Phaseolus vulgaris, as well as a corresponding amino sequence. The invention provides a recombinant plasmid pET28a(+)-pveh2 and a genetic engineering bacteria E.coli BL21(DE3) / pET28a(+)-pveh2, which comprise the gene. A recombinant epoxide hydrolase is prepared through expression by the bacterial strain. The invention provides a method of biocatalysis through fermentation with an enzyme produced by the recombinant bacterial strain constructed in the invention, thus producing enantiomerically pure R-type styrene oxide (ee > 99%); in addition, final yield can reach 49.3%, which is approximate to a theoretical value, 50%.

The present invention relates to a preparation method and applications of a functional coordination polymer, and belongs to the technical fields of material science, nanometer materials, catalysis and the like. According to the present invention, polyvinylpyrrolidone, silver nitrate and 3-ethyl-1,2,4-triazole are adopted as main raw materials to prepare Ag@MOF, and a porous titanium dioxide shell layer is coated on the surface to prepare the functional coordination polymer Ag@MOF@TiO2. The polymer has the excellent performance of catalytic reduction of 4-nitrophenol into 4-aminophenol and catalytic oxidation of styrene into styrene oxide, and has good application prospects in heterogeneous catalytic reduction and oxidation reactions.

The invention relates to a preparation method and application of multiple magnetic mesoporous catalysts, and belongs to the technical fields of material science, nanometer materials, chemical industries, catalysis and the like. The method disclosed by the invention comprises the following steps: performing ultrasonic treatment for Fe3O4 microspheres of which the surfaces are carboxylated, zinc nitrate, cyanuric chloride tribasic carboxylic acids H3L and ethyl orthosilicate in one step to obtain Fe3O4@-MOF@SiO2, dipping the composite materials in a silver nitrate solution, and illuminating the composite materials with ultraviolet rays to reduce Ag<+> to obtain the multiple magnetic mesoporous catalysts, wherein nanometer Ag is anchored on the surfaces of the catalysts. The catalysts have excellent properties of catalyzing and reducing 4-nitrophenol to 4-aminophenol and catalyzing styrene to be oxidized as phenyl ethylene oxide, and the catalysts have a favorable application prospect in heterogeneous catalysis oxidation and reduction reactions.

The invention discloses an epoxide hydrolase enzyme gene, encoding enzymeand, carrier, and recombination gene engineering bacteria which are derived from solid mycete ZJB120203, and application in preparation of recombination epoxide hydrolase. The epoxide hydrolase enzyme gene can be connected with expression carrier and obtain expression recombinant plasmid Pet28a-EH obtaining the epoxide hydrolase enzyme gene, and the expression recombinant plasmid Pet28a-EH converses into escherichia coli BL21 and recombinant escherichia coli is obtained. The recombinant escherichia coli contains recombinant epoxide hydrolase enzyme gene. The recombinant escherichia coli can be used for enzyme resource, and racemic epichlorohydrin and racemic phenyl ethylene oxide are used for substrate, then the bioconversion reaction is carried out and S-epichlorohydrin and R-phenyl ethylene oxide which are with high optical purity are prepared.

The invention provides novel polyether of styrene oxide ring-opening repeating unit and a preparation method thereof. The preparation method comprises the following steps: the oxygen in the air is isolated; chemical substances containing reactive hydrogen are used as an initiator for polymerization; according to the required amount of the needed objective product, 0 to 99 percent of solvent, is added, a plurality of types of 0.0001 to 99 percent of catalysts are added by times and polymeric monomers of styrene oxide, propylene oxide, ethylene oxidel, butylene oxide and vinylnaphthalene oxide are added by one time or batch; ring opening polyaddition is carried out to form coarse polyether under the temperature of 0 to 300 DEG C, the coarse polyether is processed by neutralization, adsorptive catalyst, degassing, separation and filtering so as to obtain objective product. The side group of the polymer contains large amount of benzene rings, is suitable for being used as surface active agent with special purpose, polyurethane materials and high molecular materials with special functions and has very wide application prospect.

The invention discloses a modified vermiculite adsorbent for removing manganese in a polluted water body. The modified vermiculite adsorbent is prepared by the following steps of: cleaning vermiculite, modifying the vermiculite by virtue of mixed liquid prepared from chitosan, acetic acid, hydroxyethyl-beta-cyclodextrin, dimethyl sulfoxide, isopropanol and 2,2-dimethyl-3-phenyl ethylene oxide, so as to form a matter A; modifying the matter A by virtue of mixed liquid prepared from SnCl4, BiCl3, Pb(NO3)2 and Cd(NO3)2, so as to form a matter B; modifying the matter B by virtue of mixed liquid prepared from tetra-n-butyl titanate, heptamethyldisilazane and pentamethyldiethylenetriamine, so as to form a matter C; and modifying the matter C by virtue of mixed liquid prepared from acrylic acid, potassium persulfate, polyvinylpyrrolidone and 2-trimethylsilylpyridine, so as to form a matter, namely the modified vermiculite adsorbent for removing the manganese in the polluted water body.

The invention provides a mesoporous polyionic liquid catalyst for normal-pressure CO2 cycloaddition reaction as well as a preparation method and application thereof and relates to the technical fieldof the preparation of multiphase catalysts in organic chemical industry. A binuclear polyionic liquid polymerization monomer [C1DVIM]Br is prepared from N-vinyl imidazole and dibromomethane through solvothermal reaction, an initiator is added into a polyethylene glycol-water solvent system, and the free radical polymerization reaction is finished by virtue of the polymerization monomer. Accordingto the method, cheap polyethylene glycol is taken as a solvent, a small amount of water is taken as a cosolvent, the mesoporous polyionic liquid prepared through self-polymerization of the initiator has a typical polycationskeleton, rich halogen sites and good heat stability, can be taken as a nonmetal heterogeneous catalyst to be applied to CO2 cycloaddition reaction for oxidizing epoxy compoundssuch as styrene oxide as substrates under a normal pressure and presents excellent catalytic activity and recycling stability.

The invention discloses a (modified) environmentally-friendly pesticide wetting dispersant, and a preparation method and an application thereof. A compound containing reactive hydrogen, used as an initial raw material, initiates ring-opening polymerization of styrene oxide under the action of a catalyst in order to obtain a reaction intermediate having a similar structure with nonylphenol or alkylphenol, and the reaction intermediate and ethylene oxide or epoxypropane or epoxybutane undergo ring-opening polymerization to obtain nonionic polyether. Compared with nonylphenol polyether or polyarylphenol ether, the nonionic polyether has the advantages of good biodegradability, and good safety to environment. The nonionic polyether and modification products thereof can be applied to pesticide emulsions in water, pesticide suspensions and other environmentally-friendly dosage forms, and have excellent emulsification dispersibility, storage stability and suspension dispersion stability as a nonylphenol polyether (NPE) or polystyrene phenol polyether substitute.

The invention discloses a titanium silicon molecular sieve and resin composite modified catalyst and a preparation method thereof. According to the invention, titanium silicon molecular sieve powder, a polymerization monomer styrene, a polymerization monomer polyene-based compound, and a pore-forming agent are sufficiently mixed; under the existence of an initiator, a polymerization reaction is carried out; an obtained block-shaped solid catalyst is processed into solid particles; the particles are swelled in halogenated hydrocarbon; and the material is extracted by using a solvent, such that a titanium silicon molecular sieve catalyst precursor is obtained. The catalyst precursor is subjected to ammonia and nitrogen mixed gas heat treatment, such that the catalyst provided by the invention is obtained. When the catalyst provided by the invention is adopted in catalytic reaction processes of a fixed bed styrene epoxidation method for preparing styrene oxide, and a fixed bed allyl chloride epoxidation method for preparing epichlorohydrin, excellent catalytic effects are provided. With the catalyst provided by the invention, a problem of separation difficulty of titanium silicon catalyst powder and a reaction liquid is solved, and reaction efficiency is improved.

The invention discloses an APET anti-static material and a manufacturing method thereof. The APET anti-static material comprises, by weight, 60-70 parts of polyethylene glycol terephthalate, 30-35 parts of polyvinylidene chloride, 15-18 parts of polyvinyl alcohol, 12-15 parts of polyacetylene, 3-6 parts of poly-p-phenylene terephthamide, 3-5 parts of styrene oxide, 1-2 parts of bis(bis-chlorin dimethylsilyl)benzene, 0.5-1 part of dimethylol acrylic acid, 0.2-1 part of magnesium chloride, 0.2-1 part of aluminum chloride and 0.02-0.5 part of dicumyl peroxide. The invention further provides the manufacturing method of the APET anti-static material.

The invention discloses a use of a phosphotungstic acid ionic liquid as a catalyst in catalysis of a styrene oxide alcoholysis ring-opening reaction. The catalyst is an ionic liquid containing phosphotungstic acid anions and alkyl sulfonic acid-modified 1-methylimidazole-pyridine-triethylamine salt structure cations. Styrene oxide and an alcohol compound as reaction raw materials undergo a ring-opening reaction in the presence of the catalyst. The phosphotungstic acid ionic liquid can be prepared conveniently, has high catalytic activity and a small use amount, cannot be dissolved in a reaction system and can be recycled. In the reaction, an emulsification phenomenon is produced so that dispersity of the catalyst in the reaction system is improved and the reaction can be promoted. In the catalysis of a styrene oxide alcoholysis ring-opening reaction by the phosphotungstic acid ionic liquid, reaction conditions are mild; environmental friendliness is obtained; and the phosphotungstic acid ionic liquid has an industrial application prospect.

The invention relates to a preparation method of tetramisole hydrochloride, and aims at solving the problems that the conventional preparation method of tetramisole hydrochloride is complex in process and the yield is low. The preparation method comprises the following steps of: firstly, heating and reacting styrene oxide and ethanol amine so as to obtain an addition product; secondly, adding an organic solvent and lewis acid into the addition product, controlling the reaction temperature and adding thionyl chloride so as to obtain a chlorination product; thirdly, adding deionized water into the chlorination product, dropping NaOH solution, subsequently dropping concentrated HCl and thiourea, heating and refluxing, cooling and separating a cyclization product; fourthly, mixing the cyclization product with concentrated HCl and lewis acid, adding NaOH solution so as to adjust the pH of the system, and heating and reacting so as to obtain a tetramisole product; and fifthly, adding deionized water into the tetramisole product, dropping concentrated HCl, and subsequently increasing the temperature and reacting so as to obtain tetramisole hydrochloride. According to the preparation method, tetramisole hydrochloride is synthesized by using a five-step method, the process is simple, the yield of each step can be more than 85%, and the yield is high.

The invention discloses a styrene epoxidation method for preparing styrene oxide. According to the invention, under the existence of a titanium silicon molecular sieve-resin composite modified catalyst, with ketone as a solvent, styrene and hydrogen peroxide are subjected to an epoxidation reaction, such that styrene oxide is produced. According to the invention, a fixed bed reaction manner is adopted, such that a problem of separation difficulty of titanium silicon catalyst powder and a reaction liquid of a traditional slurry reactor is solved. The reaction efficiency is improved. Also, with the modification upon the catalyst, a ring-opening side reaction of the epoxide is eliminated, and product selectivity is improved.

The invention discloses aspergillus usamii epoxide hydrolase mutants with improved enantioselectivity, and belongs to the technical field of enzyme engineering and biological catalysis. Aspergillus usamii epoxide hydrolases (AuEH2) are subjected to molecular modification on the basis of rational designs and are combined with site-saturation mutagenesis methods for genes, so that the multiple epoxide hydrolase mutants with the improved enantioselectivity can be obtained. The aspergillus usamii epoxide hydrolase mutants have the advantages that racemic styrene oxide (rac-SO) can be catalyzed by the six mutants AuEH2A250I, AuEH2A250M, AuEH2A250Y, AuEH2A250S, AuEH2A250L and AuEH2A250V with the improved enantioselectivity, and the enantiomeric ratios (E values) of the six mutants can be increased and respectively reach 48, 27.2, 23.9, 21.8, 20.0 and 19.4 from the original 16 as compared with wild type mutants.

The invention discloses a method for oxidizing styrene. According to the method, the styrene comes into contact with an oxidant under the condition of oxidation reaction. The method is characterized in that the oxidant is an ozone-containing gas. According to the method, the phenylacetaldehyde selectivity is high, and the selectivity of styrene oxide is greatly improved in the presence of a titanium-containing catalyst.

A polyalkylene carbonate resin composition with interpenetrating network structure includes an aliphatic polycarbonate obtained through a reaction of carbon dioxide with at least one epoxide compound selected from the group consisting of (C2-C10)alkylene oxide substituted or unsubstituted with halogen or alkoxy, (C4-C20)cycloalkylene oxide substituted or unsubstituted with halogen or alkoxy, and (C8-C20)styrene oxide substituted or unsubstituted with halogen, alkoxy, alkyl or aryl, at least one compound selected from a polyol compound, an epoxy compound and an acryl compound, and a curing agent for polymerization or networking.

The present invention discloses a benzoyl formic acid synthesis method comprising the following steps: styrene is used as a starting material for implementation of hydrogen peroxide catalytic epoxidation reaction to produce styrene oxide intermediate, alpha-Hydroxyphenylacetone is obtained by hydrolysis of styrene oxide, and the generated alpha-Hydroxyphenylacetone is further oxidized into the desired product benzoyl formic acid. Advantages of the method are that: by use of the method using a solid base for hydrogen peroxide catalytic oxidation of the styrene substrate to form a styrene oxide precursor material, the use of hydrobromic acid is avoided, industrial production reaction cleanability is improved, product preparation selectivity, overall yield and product purity are improved, reaction condition is mild, reaction time is short, the complexity of the reaction process is reduced and industrialization is easy.

An improved catalytic process for the preparation of epoxides from alkenes using a combination of transition metal salt, an inorganic promoter and an organic additive in absence of solvent or in the presence of a solvent with commercially available hydrogen per oxide has been disclosed. Thus, styrene oxide was prepared at a kilogram scale in 86% isolated yield with purity >95%.