225 results about "Ozonolysis" patented technology

A composition for purifying an ozone-containing gas comprising activated carbon, in which the percentage of the volume of pores having a pore diameter of 0.4-0.8 nm in the volume of pores having a pore diameter of 0.4-2.0 nm is 75% or more, and an ozone decomposition catalyst powder is disclosed. Also disclosed is a filter for purifying an ozone-containing exhaust gas comprising activated carbon powder, in which the percentage of the volume of pores having a pore diameter of 0.4-0.8 nm in the volume of pores having a pore diameter of 0.4-2.0 nm is 75% or more, and an ozone decomposition catalyst powder carried on a fiber supporting body. The composition and filter of the present invention can remarkably reduce the content of ozone and volatile organic compounds in ozone-containing exhaust gas from printers.

Methods of treating single walled and multiwalled carbon nanotubes with ozone are provided. The carbon nanotubes are treated by contacting the carbon nanotubes with ozone at a temperature range between 0° C. and 100° C. to yield functionalized nanotubes which are greater in weight than the untreated carbon nanotubes. The carbon nanotubes treated according to methods of the invention can be used to prepare complex structures such as three dimensional networks or rigid porous structures which can be utilized to form electrodes for fabrication of improved electrochemical capacitors. Useful catalyst supports are prepared by contacting carbon nanotube structures such as carbon nanotube aggregates, three dimensional networks or rigid porous structures with ozone in the temperature range between 0° C. and 100° C.

The present invention relates generally to polymers and monomers derived from agricultural feedstocks, and more particularly to methods for the production of monomers from renewable agricultural resources such as feedstocks, for example canola, flax and tallow, and polymers, in particular polyurethanes produced from monomers derived from such feedstocks. The present invention also relates to novel processes for the production of short-chain alcohols, as well as hydroxyl wax esters, from renewable feedstocks. An improved apparatus for carrying out ozonolysis reactions is also disclosed.

The invention provides an ozonolysis catalyst which comprises metal foamed nickel and manganese or iron oxide, wherein the metal foamed nickel is adopted as a catalyst carrier and a catalyst auxiliary active component; and the manganese or iron oxide adopted as a main active component is coated on the surface of the foamed nickel by a soaking way. Obviously, the cost of preparation materials is low. The invention provides a preparation method of the ozonolysis catalyst, which comprises the following steps of: A. mixing an active component solution comprising manganese nitrate or ferric manganese nitrate; B. soaking the foamed nickel adopted as a carrier into the active component solution; and C. drying the soaked carrier and baking at a certain temperature. Accordingly, the preparation process is simple and convenient.

A process for preparing an alpha, omega-dicarboxylic acid or an ester thereof, which includes (a) subjecting at least one unsaturated fatty acid or fatty acid derivative to ozonolysis to obtain an ozonolysis reaction mixture; and (b) oxidizing the ozonolysis reaction mixture with an oxidizing agent in the presence of an acid catalyst to obtain an oxidized reaction mixture comprising at least one alpha, omega-dicarboxylic acid or ester; wherein the process is performed using a solvent and the acid catalyst has a pKa of less than or equal to zero, as measured at 25° C.

A sidestream located hyper-plasma reactor having an axially discrete pattern of alternating regions of active and passive electric field along the axial direction. The hyper-plasma reactor has great efficacy in terms of ultra low power consumption and copious production of NO_x converting aldehydes in the absence of NO by applying plasma power only to an air and hydrocarbon mix sidestream gas flow. Only a small fraction (1% to 2%) of plasma power is required as compared to that for a conventional plasma reactor to treat the full exhaust gas stream. The hyper-plasma reactor produces ozone which reacts subsequently with hydrocarbons to produce aldehydes (“ozonolysis”). The sidestream location of the hyper-plasma reactor allows for the full exhaust stream to bypass it, without significantly affecting the overall NO_x conversion performance in the catalytic converter.

A sidestream located hyper-plasma reactor having an axially discrete pattern of alternating regions of active and passive electric field along the axial direction. The hyper-plasma reactor has great efficacy in terms of ultra low power consumption and copious production of NO_x converting aldehydes in the absence of NO by applying plasma power only to an air and hydrocarbon mix sidestream gas flow. Only a small fraction (1% to 2%) of plasma power is required as compared to that for a conventional plasma reactor to treat the full exhaust gas stream. The hyper-plasma reactor produces ozone which reacts subsequently with hydrocarbons to produce aldehydes (“ozonolysis”). The sidestream location of the hyper-plasma reactor allows for the full exhaust stream to bypass it, without significantly affecting the overall NO_x conversion performance in the catalytic converter.

A system and method for the treatment and reduction of sludge via ozonation in a wastewater treatment process is disclosed. The sludge treatment system comprises: a sludge ozonation reactor coupled to an activated sludge treatment basin and adapted to receive a liquid stream of sludge containing biosolids from the activated sludge treatment basin. The sludge treatment system also includes an ozone-enriched gas injection system operatively coupled to the reactor and adapted to inject ozone-enriched gas into the liquid stream at or upstream of the sludge ozonation reactor. The sludge ozonation reactor is configured to allow effective gas-liquid contacting between the ozone-enriched gas and the liquid stream so as to oxidize the biosolids in the liquid stream and initiate bacterial cell lysis thereby reducing the biosolids. Upon reduction of the biosolids, the liquid stream is returned via a return line to the activated sludge basin or other discharge point.

The invention provides a cerium-manganese composite oxide catalyst as well as a preparation method and application thereof. Chemical components of the cerium-manganese composite oxide catalyst are as follows: CeMnaOx, wherein the valence state of Mn is mainly valence 4 and the value of a is selected from natural numbers between 10 to 25. The preparation method of the catalyst comprises the following steps: firstly, mixing ammonium persulfate with a solution containing a cerium source and a bivalent manganese source and then completely dissolving to obtain a reaction solution; secondly, carrying out hydrothermal reaction on the reaction solution; carrying out post treatment on a reaction product to obtain a solid product; thirdly, roasting the solid product to obtain the cerium-manganese composite oxide catalyst. The cerium-manganese composite oxide catalyst has the advantages of excellent moisture resistance, high decomposition rate of ozonolysis under the condition of high humidity and high airspeed and high heat stability; in addition, the preparation method of the cerium-manganese composite oxide catalyst is simple and is suitable for decomposing ozone.

A method for surface treating a carbon-containing material in which carbon-containing material is reacted with decomposing ozone in a reactor (e.g., a hollow tube reactor), wherein a concentration of ozone is maintained throughout the reactor by appropriate selection of at least processing temperature, gas stream flow rate, reactor dimensions, ozone concentration entering the reactor, and position of one or more ozone inlets (ports) in the reactor, wherein the method produces a surface-oxidized carbon or carbon-containing material, preferably having a surface atomic oxygen content of at least 15%. The resulting surface-oxidized carbon material and solid composites made therefrom are also described.

A method for producing ozone for use in ozonolysis reactions. Oxygen is separated from the mixture of ozone and oxygen from an ozone generation unit and is fed back to the oxygen feed to the generation unit. Nitrogen is fed to the ozone separation unit and the mixture of nitrogen and ozone is fed to the ozonation reactor where the ozone will react with organic compounds to produce desired end products.

The present invention is generally directed to methods of ozonating CNTs in fluorinated solvents (fluoro-solvents), wherein such methods provide a less dangerous alternative to existing ozonolysis methods. In some embodiments, such methods comprise the steps of: (a) dispersing carbon nanotubes in a fluoro-solvent to form a dispersion; and (b) reacting ozone with the carbon nanotubes in the dispersion to functionalize the sidewalls of the carbon nanotubes and yield functionalized carbon nanotubes with oxygen-containing functional moieties. In some such embodiments, the fluoro-solvent is a fluorocarbon solvent, such as a perfluorinated polyether.

The invention discloses a preparation method for imipenem medicine intermediate 4AA. The preparation method comprises making 4-substituted aniline into an intermediate A, perform epoxidation on L-threonine to produce (2R, 3R)-epoxy butyric acid; enabling (2R, 3R)-epoxy butyric acid and the intermediate A to undergo a coupling reaction, obtaining an intermediate B, enabling the intermediate B to undergo a cyclization reaction, obtaining an intermediate C, enabling the intermediate C to undergo a hydroxyl protection reaction, obtaining an intermediate D, enabling the intermediate D to be oxidized to form an acetoxy group, and enabling an oxidized product to undergo an ozonation reaction, wherein G is H, F, Cl, Br, a methoxy group, oxethyl or an amino group; and R is H, straight chain alkyl of C1-C6, cyclopropyl, isopropyl, tert-butyl, a phenyl group, p-chlorophenyl, o-chlorophenyl, p-bromophenyl, o-bromophenyl, p-methoxyphenyl, o-methoxyphenyl or m-methoxyphenyl. According to the preparation method, raw materials are cheap and easy to obtain, reaction conditions are mild, the conversion rate and the yield rate are high, and the preparation method is suitable for industrial production.

Methods are provided for making reversible crosslinked polymers. Exemplary methods comprise reacting first and second thermoplastic polymers having non-hindered olefins in the presence of a metathesis catalyst under conditions sufficient to form a crosslinked polymer. In certain embodiments, the methods comprise providing a crosslink promoting additive to improve the strength of the crosslinked polymer. In some embodiments, the methods comprise decrosslinking a crosslinked polymer through a metathesis or an ozonolysis reaction.

The invention discloses a high-efficiency moisture-proof ozonolysis catalyst and a preparation method thereof, belonging to the technical field of ozone purification catalysts. According to the high-efficiency moisture-proof ozonolysis catalyst disclosed by the invention, the oxides of manganese, copper, nickel and cobalt are taken as active components; the preparation method of the high-efficiency moisture-proof ozonolysis catalyst is a sol-gel method; in the preparation process, manganese nitrate tetrahydrate, copper nitrate trihydrate, nickel nitrate hexahydrate and cobalt nitrate hexahydrate are dissolved in deionized water to obtain a nitrate solution; the nitrate solution is slowly added in a mixed solution of citric acid and a cationic surface active agent; after the pH value of the mixed solution is adjusted with ammonium hydroxide, constant temperature stirring is performed to obtain gel; and after the gel is dried, calcination is performed to obtain the ozonolysis catalyst. The preparation method disclosed by the invention is simple and low in costs, solves the problem that the ozonolysis catalyst is relatively poor in moisture-proof performance, and meanwhile, improves the ozonolysis efficiency; and the ozonolysis catalyst is long in service life, and the ozonolysis efficiency is not lowered when the ozonolysis catalyst is continuously used for a month.

The invention provides a novel emulsion wastewater treatment process. The process comprises a regulating reservoir, an accident pool, a demulsification device, a paper strip filter, a ceramic film filter, an ozonolysis tank, a hydrolysis acidification pool, an aeration tank, a settling pond, a quartz sand filter and a water discharge pool. Aiming at the characteristics of emulsion water quality, physicochemical treatment units and biological treatment units are reasonably combined, and the process has the advantages of short and compact process procedures, high treatment efficiency, low energy consumption, long service life of a film component and the like.

The invention discloses an iron-copper composite oxide supported catalyst for room-temperature ozonolysis, particularly relates to an ozonolysis catalyst and a preparation method of the ozonolysis catalyst, and relates to the fields of catalysis and environmental protection. Honeycomb ceramics or multi-hole foam metal or activation carbon fiber cloth is used as a carrier of the catalyst, iron-copper composite oxide is a main active component, and gold is an auxiliary active component. The preparation method mainly comprises: A. Fe2O3-CuO composite oxide powder is prepared through the adoption of a precipitation method; B. the powder is dispersed in water, the PH value of the water is adjusted to be 7-8, HAuCl4 solution is dropped in the water, and the PH value of the water is again adjusted to be 7-8; C. the suspension liquid is heated to 30-50 DEG C, reacts for 1-3 hours, and is filtered, washed, dried and roasted to obtain a target product; and D. deionized water and silica gel which are provided with a fixed ratio are added to the catalyst to be processed into seriflux, the carrier of the catalyst is placed in the seriflux, soaked, taken out and then dried and roasted. The catalyst prepared by adopting the method is simple in process, low in cost, and high in catalytic activity and stability for ozonolysis in the indoor air.

The invention discloses a decoration space peculiar smell purifying method and device and belongs to the technical field of air purification. The decoration space peculiar smell purifying method comprises the purifying process that peculiar smell in a decoration space enters a low-temperature plasma reactor to be treated and then enters a catalytic reactor, ultraviolet rays and a by-product ozone produced by the plasma reactor can strengthen the photocatalytic pollutant and intermediate product degradation process, residual ozone and nitric oxide and other by-products are removed through an efficient ozone decomposition catalyst, and meanwhile the peculiar smell in the decoration space is after-purified through an activated carbon layer and then is discharged into a room together with negative ions. The peculiar smell in a newly decorated room can be effectively treated, the ultraviolet rays and ozone produced by a low-temperature plasma can be also fully utilized to strengthen the photocatalytic pollutant and intermediate product degradation, the two processes complement each other's advantages, the energy utilization rate can be improved, and meanwhile the negative ions are released to actively purify an indoor air environment.

The invention discloses a deep treatment method of coking wastewater. The method comprises the following steps of firstly adjusting pH of wastewater and filtering; reacting in a first-stage ozone reaction tower and a second-stage ozone reaction tower; carrying out ozonolysis in an enclosed intermediate water tank; treating in an aeration biological filtering tank; and introducing non-decomposed ozone into a tail gas absorber or destroyer. A treatment device mainly comprises a mixing sedimentation tank, the first-stage ozone reaction tower, the second-stage ozone reaction tower, the aeration biological filtering tank and conveying pipes, wherein the conveying pipe between the mixing sedimentation tank and the first-stage ozone reaction tower is connected with a multi-medium filter; and the conveying pipe between the second-stage ozone reaction tower and the aeration biological filtering tank is connected with the enclosed intermediate water tank and the tail gas absorber or destroyer is connected with two ozone reaction towers and the enclosed intermediate water tank. By combining ozone catalytic ozonation and the aeration biological filtering tank, non-biodegradable organic substances in wastewater are oxidized by virtue of ozone and mineralized or partially oxidized into easily degradable small molecular organic substances and the small molecular organic substances can be subjected to subsequent treatment by virtue of cheap organisms in the aeration biological filtering tank.