69results about "Chemical modification purification/separation" patented technology

A clathrate of 1-methylcyclopropene with α-cyclodextrin, obtained as a solid particulate product, is modified by comminuting, classifying, or both to obtain a modified particulate. When subjected to identical atmospheric disgorgement conditions of humidity and temperature, identical masses of the modified and unmodified particulates exhibit different rates of 1-methylcyclopropene disgorgement. Specifically, we have found that a smaller mean particle size is inversely related to a greater rate of 1-methylcyclopropene release.

The invention relates to the technical field of dry gas treatment, and discloses a method and a device for preparing polymer grade ethylene by recovering C2 components in dry gas and application, the method comprises the following steps: (1) compressing the raw material dry gas and carrying out gas-liquid separation to obtain a gas phase and a liquid phase; (2) contacting the gas phase with an absorbent for C2 component absorption to obtain absorption tail gas and an absorption rich solution; (3) performing methane desorption on the liquid phase to obtain desorbed gas and a rich absorbent; (4) desorbing and separating the rich absorbent to obtain a lean absorbent and concentrated gas; (5) the concentrated gas is subjected to acid gas removal, dehydration and impurity removal and then sent to a deethanizer for separation of light components and heavy components, and a gas phase at the top of the tower serves as feed to enter an ethylene rectifying tower for separation of ethylene and ethane; and (6) extracting a polymer-grade ethylene product from the side of the body of the ethylene rectifying tower. The C2 component recovered by the method has the advantages of high purity, high recovery rate, simple process, low steam consumption, no need of a deoxidation reactor and a demethanizer, and low energy consumption of the device.

The application relates to the field of mixed gas purification and discloses application of gaseous alkane in reducing the risk of combustion and explosion in the deoxidation process of oxygen-containing gas, which comprises: mixing the oxygen-containing gas with hydrogen in the presence of stabilizing gas to perform an oxidation reaction; wherein the stabilizing gas is gaseous alkane, and the oxygen-containing gas contains oxygen and optional other flammable gas. The method for deoxidizing the oxygen-containing light hydrocarbon by hydrogen provided by the application reduces the risk of combustion and explosion of the mixed gas by taking gaseous alkane as the stabilizing gas, adopts the hydrogen-catalyzed reaction to promote the reaction of oxygen in the mixed gas with hydrogen to generate water, achieves the purpose of deoxidation of the oxygen-containing gas, the reaction product is clean, the hydrogen-catalyzed reaction can effectively inhibit the occurrence of carbon deposition on the surface of the catalyst and the generation of carbon oxides, and the hydrogen-catalyzed reaction has strong bearing capacity for the fluctuation of the oxygen content of the raw material gas.

The invention relates to a device and method for improving the recovery efficiency of acetylene gas in a waste sodium hypochlorite solution, the device for improving the recovery efficiency of acetylene gas in the waste sodium hypochlorite solution comprises: a flash tank, the bottom of which is provided with a waste sodium hypochlorite solution discharge pipeline; the heater is communicated with the liquid inlet of the flash tank through a conveying pipeline, and the heater is used for heating the waste sodium hypochlorite liquid and conveying the waste sodium hypochlorite liquid to the flash tank; an inlet of the water ring vacuum pump unit is communicated with the top of the flash tank through a main pipeline; the cooling device is arranged on the main pipeline and is used for cooling acetylene gas discharged from the top of the flash tank; and the alkali washing tank is arranged on the main pipeline and is used for carrying out alkali washing and impurity removal on the acetylene gas. According to the technical scheme, the device for improving the recovery efficiency of the acetylene gas in the waste sodium hypochlorite solution can effectively improve the separation efficiency of the acetylene gas and can guarantee the purity of the recovered acetylene gas.

The invention provides a method for preparing methane through pyrolysis of medical waste and application of the method, and relates to the technical field of medical waste treatment and energy recovery, and the method comprises the following steps: pyrolyzing the medical waste to obtain pyrolysis gas, purifying the pyrolysis gas, then carrying out steam reforming reaction to obtain reacted gas, separating and purifying the reacted gas to obtain the methane. Methane is obtained; during pyrolysis, the temperature is increased to 190 DEG C to 210 DEG C and kept for 8 min to 12 min, then the temperature is increased to 390 DEG C to 410 DEG C and kept for 13 min to 17 min, and then the temperature is increased to 540 DEG C to 560 DEG C and kept for 30 min to 40 min; the steam reforming reaction catalyst is a lanthanum modified nickel-based catalyst. According to the method, the technical effects of destroying pathogens in the medical wastes, cracking macromolecular organic matters, improving the methane yield and purity and reducing the treatment cost are achieved, and harmless, resourceful and efficient treatment of the medical wastes is realized.

A method for reducing the risk of burning and explosion in a deoxygenation process of an oxygen-containing gas includes multiple steps. According to this method, in the presence of a gaseous alkane, hydrogen reacts with an oxygen-containing gas from which an unsaturated hydrocarbon has been removed. The oxygen-containing gas contains the oxygen and the unsaturated hydrocarbon, and the content of the oxygen in the oxygen-containing gas is greater than 0.5% by volume. A gaseous alkane is introduced to reduce the risk of burning and explosion of a mixed gas. A hydrocatalytic reaction is carried out to promote oxygen in the mixed gas to react with hydrogen to produce water, which removes oxygen from the oxygen-containing gas and also effectively inhibits carbon deposition on the surface of a catalyst and the production of a carbon oxide, which enhances the toleration for fluctuation of the oxygen content in a raw gas.

The invention provides a method for removing butadiene in mixed C4. The method comprises the steps of reaction absorption, maleic anhydride absorption, maleic anhydride analysis and tetrahydrophthalic anhydride refining. The problems that in the prior art, a solvent extraction method is not thorough in removal of butadiene in mixed C4, the technological process is complex, the separation cost of low-content butadiene is high, and a selective hydrogenation method needs to remove water and a solvent, the technological process is complex, selectivity is poor, a catalyst is high in price and prone to coking, so that the service life is shortened, and production efficiency is low are solved. And meanwhile, the problems that the content of 1, 3-butadiene in the mixed C4 is too high, so that olefin superposition byproducts in subsequent etherification, esterification and alkylation reactions are increased, the pore channels of the catalyst are blocked, and the service life of the catalyst is shortened are solved.

To provide enhanced systems and methods of chemical synthesis that reduce or eliminate the amount of fuel, particularly fossil fuel, that is burned to provide energy.SOLUTION: A chemical synthesis plant comprising a reactor configured for producing a process stream comprising a chemical product from a reactant; a feed preparation system configured to prepare a feed stream of the reactant for introduction into the reactor; and / or a product purification system configured to separate the chemical product from a reaction byproduct, unreacted reactant, or a combination thereof within the process stream, wherein the chemical synthesis plant is configured such that a majority of the net energy required for heating, cooling, compression, or a combination thereof utilized via the reactor, the feed preparation system, the product refining system, or a combination thereof is supplied from the intermittent energy source (IES).SELECTED DRAWING: Figure 3

The invention belongs to the field of styrene extraction, and relates to a long-period operation system and method of a styrene extraction device. Comprising an extraction rectifying tower, an extraction rectifying tower reflux tank, a solvent recovery tower, a solvent recovery tower reflux tank, a water washing tower, an oil washing oil recovery tower, a lean solvent oil washing mixer and a water washing water preheater, a tower top discharging pipeline of the extraction rectifying tower is connected with an extraction rectifying tower return tank, a tower bottom discharging pipeline is connected with the solvent recovery tower, a water-in-water discharging pipeline of the extraction rectifying tower return tank is sequentially connected with the washing water preheater and the washing tower, and a tower top discharging pipeline of the solvent recovery tower is connected with the solvent recovery tower return tank. One tower bottom discharging pipeline is connected with a lean solvent oil washing mixer and a water washing tower, a water-in-water discharging pipeline of a solvent recovery tower return tank is connected with an extraction rectifying tower return tank or an extraction rectifying tower, and a tower top discharging pipeline of the water washing tower is connected with an oil washing oil recovery tower. According to the invention, the generation source of the polymer is fundamentally cut off, and the long-period stable operation of the device is realized.

The invention relates to a process and a production unit for producing olefin trimers. A process and a production unit for the catalytic production of olefin trimers from olefin monomers, wherein the olefin dimers are recycled after the dimerization reaction and reacted with olefin monomers in an addition reaction.

The invention relates to a liquid decolorizing agent for decolorizing crude styrene and a decolorizing method of crude styrene. The liquid decolorizing agent contains 70-90 wt% of a decolorizing component and the balance of a polymerization inhibitor. Wherein the decolorizing component contains a first decolorizing component and optionally a second decolorizing component, and the first decolorizing component contains citraconic anhydride. The decolorizing agent disclosed by the invention is liquid at normal temperature, stable in property and good in decolorizing effect.

Systems and methods for removing impurities from a feed fluid in a single vessel. A method generally includes, in a single vessel, contacting a feed fluid passing through the vessel with a copper-based material for removing oxygen from the feed fluid; and contacting the feed fluid passing through the vessel with an adsorbent for removing at least one of water, carbon dioxide, and oxygenated hydrocarbons from the feed fluid.

The invention discloses an acetylene gas production and purification device, which relates to the technical field of purification devices and comprises a purification tank, a replacement tank, an acetylene gas inlet pipe, an acetylene gas outlet pipe, a new liquid feeding pipe, a new liquid discharging pipe and a waste liquid recycling pipe, after a part of the reacted silver nitrate solution is discharged, the suspension plate upwards jacks the control rod, so that the blocking plate does not block the new liquid discharging pipe any more, the new silver nitrate solution is added into the purification tank, and after most of the reacted silver nitrate solution enters the recovery cavity, the new liquid discharging pipe is blocked by the blocking plate; a suspension plate drives a sliding block to move upwards, so that a clamping block does not position a sealing plate any more, the sealing plate is reset through a first spring, a large amount of new silver nitrate solution enters the purification tank and then acetylene purification can be continued, and the effect that the device can automatically discharge and replace according to the real-time reaction degree of the silver nitrate solution is achieved; compared with the prior art, the device has the advantage that the replacement time is more accurate.

The invention discloses a method for refining polymer-grade m-pentadiene. The method comprises the following steps: carrying out selective hydrogenation reaction on a crude m-pentadiene material to remove alkyne so as to obtain an alkyne-removed m-pentadiene intermediate material; mixing the deacetylated m-pentadiene intermediate material with cyclic ketone, alcohol and organic alkali, and carrying out reactive distillation to remove cyclopentadiene so as to obtain decyclized m-pentadiene; and refining and purifying the decyclized m-pentadiene through water washing and extractive distillation to obtain the decyclized m-pentadiene. The obtained polymer-grade pentadiene product is high in purity, the content of impurity cyclopentadiene in the polymer-grade pentadiene product is lower than 1ppm, and the content of impurity alkyne in the polymer-grade pentadiene product is lower than 20ppm.

The invention provides a calcium carbide process acetylene purification post-treatment method, H2S and PH3 in acetylene gas are treated by sequentially adopting wet catalytic oxidation and an adsorbent adsorption method, an oxidizing agent for wet catalytic oxidation is a mixed solution of ferric sulfate and sulfuric acid, a water-soluble manganese salt and a water-soluble tungstate are also added into the mixed solution, and the water-soluble manganese salt and the water-soluble tungstate are added into the mixed solution. The adsorbent is a cerium-zirconium solid solution loaded with copper oxide. Mn < 2 + > dissociated from manganese salt is introduced into a catalytic oxidation system and forms a bi-component catalytic center with original Fe < 3 + > / Fe < 2 + >, so that the regeneration rate of Fe < 2 + > to Fe < 3 + > can be remarkably accelerated, and the oxidation of the catalyst on hydrogen sulfide and hydrogen phosphide is greatly improved; tungstate is introduced to effectively prevent elemental sulfur from depositing and blocking on the filler and equipment by changing the crystal form of the elemental sulfur, so that the system is guaranteed, PH3 molecules are catalyzed to generate hydrolysis reaction, and phosphorous acid which is easier to oxidize is generated.

The invention belongs to the technical field of chemical catalysis, and provides a preparation method and application of a modified MCM-22 molecular sieve catalyst. Unroasted MCM-22 (P) is used as a raw material, organic alkali (such as tetramethylammonium hydroxide, tetraethylammonium hydroxide, tetrapropylammonium hydroxide or tetrabutylammonium hydroxide) is adopted for modification treatment, and then ion exchange and roasting are performed to obtain the hydrogen type modified molecular sieve. Organic alkali has the synergistic effect of alkali treatment and structure guiding, and the crystal phase purity and framework integrity are maintained while controllable desilicication is achieved. The catalyst is used for alkylation removal reaction of thiophenic sulfur in styrene, the selectivity of mono-substituted alkylation products is remarkably improved, and side reaction of styrene polymerization is effectively inhibited. The preparation method is simple, the catalytic performance is excellent, and the catalyst has a good industrial application prospect.

A clathrate of 1-methylcyclopropene with α-cyclodextrin, obtained as a solid particulate product, is modified by comminuting, classifying, or both to obtain a modified particulate. When subjected to identical atmospheric disgorgement conditions of humidity and temperature, identical masses of the modified and unmodified particulates exhibit different rates of 1-methylcyclopropene disgorgement. Specifically, we have found that a smaller mean particle size is inversely related to a greater rate of 1-methylcyclopropene release.

The present disclosure relates to a method for recovering styrene monomers from waste polystyrene, and more specifically, to a method for recovering styrene monomers from waste polystyrene, in which the waste polystyrene is depolymerized using an eco-friendly solvent and a potassium-containing carbonate depolymerization catalyst to suppress the generation of ethylbenzene, etc. generated as by-products in a styrene monomer recovery step, and thus the styrene monomers can be recovered in high yield.

The application provides a cyclododecatriene preparation reaction post-processing process and system, which comprises the following steps: a termination process, in which a termination agent is mixed with a CDT reaction solution to perform catalyst quenching, so as to obtain a first mixture; wherein the termination agent comprises an alcohol, a phenol or a mixed solution of the alcohol and the phenol; a first extraction process, in which lye is used to extract the first mixture after cooling operation, so that a first oil phase is obtained and input into a second extraction process; and the second extraction process, in which pure water is used to extract the first oil phase, so that a second oil phase is obtained and input into a subsequent rectification separation process to obtain a cyclododecatriene product with high purity. The catalyst inactivation effect of the process is good, the loss rate of the CDT product obtained after the subsequent rectification separation is reduced, and the product recovery rate is high; the CDT reaction solution treated by the process avoids the equipment corrosion problem in the subsequent process, can reduce the equipment investment cost, simultaneously reduces the solid content and ensures the stable and continuous operation of the device.

The invention discloses a method for removing 2, 5-diphenyloxazole in linear alkylbenzene and application thereof.The linear alkylbenzene containing 2, 5-diphenyloxazole is subjected to shallow sulfonation in the presence of catalysts such as a 4A molecular sieve, activated carbon, kaolin and bentonite at the temperature of 0-30 DEG C, the content of 2, 5-diphenyloxazole in the linear alkylbenzene can be reduced to 6 ppm or below from 3000 ppm through simple filtration, and the 2, 5-diphenyloxazole in the linear alkylbenzene can be reduced to 6 ppm or below. And sulfonating through an SO3 membrane reactor to obtain an alkyl benzene sulfonic acid superior product.

This invention belongs to the field of petrochemical technology and discloses a system and method for separating and preparing high-purity propane and high-purity propylene. The system mainly utilizes a pre-reactor, storage tank, catalytic distillation column, catalytic cracking distillation column, and heat exchanger. Propylene first undergoes an etherification reaction in the pre-reactor, and then the remaining propylene undergoes an etherification reaction in the catalytic distillation column, with high-purity propane obtained from the top of the column. The bottom material enters the catalytic cracking distillation column for catalytic cracking, with high-purity propylene obtained from the top of the column. This invention can obtain propane products with a content ≥99.9% and propylene products with a content ≥99.9%, and can also co-produce the fine chemical methyl isopropyl ether. This invention combines reactive distillation and catalytic cracking distillation processes, resulting in high propylene and propane yields, strong adaptability to raw materials, and the ability to handle mixtures with a wide range of propane and propylene contents. This method requires fewer distillation column trays, has low equipment investment, and is simple to operate.

An ammonia synthesis plant comprising: a feed pretreating section operable to pretreat a feed stream; a syngas generation section operable to reform the feed stream to produce a reformer product stream; a shift conversion section operable to subject the reformer product stream to the water gas shift reaction, to produce a shifted gas stream comprising more hydrogen than the reformer gas stream; a purification section operable to remove at least one component from the shifted gas stream, and provide an ammonia synthesis feed stream; and / or an ammonia synthesis section operable to produce ammonia from the ammonia synthesis feed stream, wherein the ammonia synthesis plant is configured such that, relative to a conventional ammonia synthesis plant, more of the energy required by the ammonia synthesis plant or one or more sections thereof is provided by a non-carbon based energy source, a renewable energy source, and / or electricity.

This invention discloses a method for purifying toluene and its application. The method includes: catalytic conversion of toluene using a porous metal catalyst in an acidic environment below 60°C; and then mixing the converted liquid with an alkaline solution for separation to obtain purified toluene. This method converts non-aromatic hydrocarbons and C8 / C9 aromatic hydrocarbons in toluene into smaller molecules or acidic substances, which are then removed by alkaline washing. When toluene is used in nitration reactions, it reduces the content of fatty acids and benzoic acids during the nitration process, preventing non-aromatic hydrocarbons and C8 / C9 aromatic hydrocarbons from converting into carboxylic acid emulsion impurities during nitration, thus reducing the risk of emulsification in the nitration reaction.

A feed stream including ethane is flowed to a purification unit that includes a first oxidative dehydrogenation catalyst. The feed stream is contacted with the first oxidative dehydrogenation catalyst at a first temperature to reduce a concentration of impurities in the feed stream to produce a purified feed stream. The purified feed stream is flowed to an oxidative dehydrogenation unit that includes a second oxidative dehydrogenation catalyst. The purified feed stream is contacted with the second oxidative dehydrogenation catalyst in the presence of oxygen at a second temperature greater than the first temperature to dehydrogenate ethane to produce a product stream that includes ethylene.

A methane purification apparatus includes a flow path through which a gas containing methane flows, an ozone supply unit that supplies ozone to the gas, and a non-metallic heater that is provided downstream of the ozone supply unit in the flow path and heats the gas and the ozone. The heater supports a catalyst for purifying the methane by causing the ozone to react with the methane.

The invention belongs to the technical field of refinery dry gas treatment, and discloses a method and a system for preparing hydrogen for a fuel cell by refinery dry gas C2 recovery coupling, the method comprises the following steps: 1) deoxidizing; 2) compressing; 3) cooling; 4) absorption: feeding the cooled refinery dry gas into an absorption tower to obtain a tower kettle material flow and tower top tail gas; 5) desorption: the tower kettle material flow of the absorption tower enters a desorption tower, and the recovered C2 concentrated gas is obtained at the top of the tower; 6) reabsorption: enabling the tail gas at the top of the absorption tower to enter a reabsorption tower to obtain tower kettle material flow and methane hydrogen tail gas at the top of the tower; 7) stabilizing; and 8) performing vacuum pressure swing adsorption or membrane separation and pressure swing adsorption to obtain the hydrogen for the fuel cell. According to the method, the absorption temperature is high, ethylene and propylene refrigeration compressors and expansion machines are not needed, the energy consumption is low, the investment is small, and the operation is simple; and C2 and hydrogen resources in the refinery dry gas are effectively recovered.

The invention discloses a method and a system for recovering industrial-grade n-heptane from toluene-containing n-heptane waste liquid, and belongs to the technical field of solvent recovery and purification. The method comprises the following steps: mixing a toluene-containing n-heptane crude product with concentrated sulfuric acid in a static mixer, carrying out sulfonation reaction, enabling toluene to generate p-toluenesulfonic acid, dissolving the p-toluenesulfonic acid in sulfuric acid, and carrying out hydrocyclone separation, water washing, secondary water separation and rectification treatment to obtain the toluene-free high-purity n-heptane. The method has the advantages of continuous process, simplicity and convenience in operation, capability of thoroughly removing toluene and meeting the requirements of zero toluene products, suitability for the recovery requirements of high-purity non-polar solvents in pharmaceutical and fine chemical industries, low energy consumption, low cost, environmental friendliness and the like.

The present application relates to the technical field of clean energy, and in particular to a novel device and method for preparing green methanol from biogas. The method comprises the following steps: S1: introducing a feed gas into a feed gas compressor, pressurizing same to 1.3 MPaG, and then preheating same to 330ºC by means of a primary convection section of a conversion furnace; S2: entering a hydrogenation reactor for olefin saturation to remove olefins and oxygen, and then entering a zinc oxide desulfurization reactor to remove excess hydrogen sulfide gas; S3: mixing the refined feed gas with water vapor outputted by a boiler, carrying out secondary preheating on the mixture to 600ºC by means of a secondary convection section of the conversion furnace, and carrying out a primary conversion reaction; S4: conveying the gas subjected to the secondary preheating to a radiation section of the conversion furnace in an environment of 910ºC for a secondary conversion reaction; and S5: performing methanol synthesis in an isothermal methanol synthesis tower. The present application can reduce carbon deposition on a catalyst during the preparation of methanol from biogas, so that frequent replacement of the catalyst is avoided, thereby reducing use costs while improving working efficiency.