119results 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 utility model discloses a separation device for ethyl acetate and cyclohexane, which belongs to the technical field of separation and purification, solves the problems of incapability of large-scale separation, high process difficulty and poor separation effect in the prior art, and comprises an extractive distillation tower, the upper part is provided with a polyol solvent inlet, the top is connected with a first condenser, the outlet of the first condenser is connected with a cyclohexane outlet on the other side of the upper part of the extractive distillation tower, and the cyclohexane outlet is connected with a re-separation device. According to the device disclosed by the utility model, the problem of azeotropy of ethyl acetate and cyclohexane is solved by adding polar polyol, the relative volatility of the ethyl acetate and the cyclohexane is changed, and large-scale efficient separation of a mixture of the ethyl acetate and the cyclohexane is realized; the dissolubility of cyclohexane, sodium acetate and ethanol in water is different, so that the separation effect of cyclohexane is further improved, and the whole device is simple in structure.

A method of safely mixing a hydrocarbon with an oxidant is provided. The hydrocarbon and oxidant are saturated with a non-flammable liquid in pre-mix zones that are flooded with the non-flammable liquid and fluidly connected to a common mixing zone that is partially flooded with the non-flammable liquid. The saturated hydrocarbon and oxidant combine within the common mixing zone forming bubbles of a homogeneous gas mixture of hydrocarbon and oxidant, preferably in a ratio of hydrocarbon to oxidant that is outside of the flammability limit, that can exit the non-flammable liquid into a headspace where it can be retrieved for use in an oxidative reaction process such as oxidative dehydrogenation.

The application discloses a system and method for preparing 1-butene by using catalytic C4, and belongs to the technical field of 1-butene production. The technical scheme is that the system comprises an etherification reactor, a catalytic distillation column, a deep etherification reactor, a light component removal column and a heavy component removal column which are sequentially connected. The application uses catalytic C4 as raw material to prepare 1-butene, widens the raw material source for preparing 1-butene, improves the utilization rate of catalytic C4, and has a good application prospect.

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.

A chemical synthesis apparatus comprising: one or more reactors configured to produce a process stream comprising at least one chemical product from one or more reactants; a feed preparation system configured to prepare one or more feed streams comprising one or more of one or more reactants to be introduced into one or more reactors; and / or a product purification system configured to separate at least one chemical product from reaction byproducts, unreacted reactants, or a combination thereof within the process stream, wherein the chemical synthesis apparatus is configured such that a majority of the net energy required for heating, cooling, compression, or a combination thereof used via one or more reactors, feed preparation systems, product purification systems, or a combination thereof is provided by a non-carbon-based energy source, renewable energy source, and / or electrical power.

The utility model discloses a methanol-to-olefin alkaline washing tower system which comprises a separating tower and an alkaline washing tower, the alkaline washing tower is connected with a gas inlet pipeline, the lower part of the alkaline washing tower is provided with an alkaline liquor circulating unit, the top of the alkaline washing tower is provided with a gas outlet pipeline, and the alkaline washing tower is connected with a water inlet pipeline and a water return pipeline; the bottom of the separation tower is provided with a separation tower bottom circulation, the separation tower bottom circulation is connected with a quenching water unit, and the separation tower bottom circulation is connected with a heater for heating the gas inlet pipeline through a quenching water circulation pipeline; according to the S-MTO device alkaline washing tower water washing system, a washing water recovery system process is arranged, a small part of washing water in the water washing section of the S-MTO device alkaline washing tower is directly fed into the quenching water system, the waste alkali liquid discharge amount of the alkaline washing tower is reduced, the fresh alkali consumption amount is reduced, the energy consumption is reduced, the energy consumption is reduced, and the energy consumption is reduced. Meanwhile, the waste alkali treatment burden of the waste alkali incineration device is reduced, the environmental protection risk is reduced, and device efficiency improvement is achieved.

The invention relates to a process for producing high-purity 1-butene and high-purity isobutene from two C4 hydrocarbon streams, in which the two streams are partially processed together. Furthermore, the present invention also relates to an apparatus for carrying out the process according to the invention.

A process for the purification of isobutene from a C4 stream with at least 1-butene, 2-butene, isobutane and isobutene includes isomerizing 1-butene from a stream of material which is concentrated in isobutane and isobutene obtained from the C4 stream into 2-butene, using a catalyst in an isomerization reactor; supplying a product stream from the isomerization reactor to a rectification column; and providing a stream of material which is concentrated in isobutene. A processing facility is utilized for the purification of isobutene from the C4 stream.

The invention relates to the field of chemical engineering, in particular to a catalytic distillation method for removing impurities in isooctane reaction raw materials, which comprises the following steps: S1, separating a C4 raw material and butadiene: treating the C4 raw material with desalted water to obtain a washed C4 raw material; carrying out coalescence dehydration treatment on the washed C4 raw material to obtain a dehydrated C4 raw material; the dehydrated C4 raw material is subjected to catalytic rectification treatment, a rectified C4 raw material is obtained, a catalyst for catalytic rectification treatment is a La-Ce / ZSM-5 catalyst, and the rectified C4 raw material is subjected to membrane separation, so that the C4 raw material and butadiene are obtained; and S2, pumping the C4 raw material into an alkylation reactor, and carrying out an alkylation reaction on the C4 raw material and isobutane under the action of a solid superacid catalyst to prepare isooctane. Compared with the prior art, the method has the advantages that impurities in the C4 raw material are removed, the byproduct butadiene and the C4 raw material are extracted, the service life of a catalyst in the isooctane preparation process can be prolonged by using the C4 raw material, the solid superacid catalyst is improved at the same time, and the C4 conversion rate and the isooctane yield are improved.

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 belongs to the technical field of preparation methods of fine compounds, and particularly relates to a preparation method of 3-(3-isopropyl phenyl) butyraldehyde. The method comprises the following steps: by taking a mixed material of m-isopropenyl cumene and phenylcyclopentene as a raw material, carrying out carbonylation reaction under the action of a catalyst; the catalyst is a noble metal carbonyl catalyst; after the reaction is finished, a reaction product is rectified, and isopropenyl isopropyl benzene is obtained; and carrying out formylation reaction on the product, and separating to obtain the 3-(3-isopropyl phenyl) butyraldehyde. The method has the advantages that raw material sources are simplified, physical and chemical properties of products obtained after different components react are changed through different reaction conditions of the different components in the reaction process, the purposes of separation, removal and purification are easily achieved, then the target product is obtained through the hydroformylation reaction, high purity is kept, and the method is suitable for industrial production. And moreover, the conversion rate is more thorough, and the cost can be greatly reduced compared with the existing production technology economically.

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 discloses a method for synthesizing low-viscosity PAO from coal-based alpha-olefins. The method comprises the following steps: S1, introducing Lewis acid gas BF3 into a coal-based alpha-olefin fraction section, carrying out a complex reaction between BF3 and oxygen-containing compounds in a coal-based alpha-olefin liquid fraction section at a pressure of 0.05 to 1 MPa to form a heterogeneous system of a BF3 complex and a coal-based alpha-olefin liquid, and then separating and removing the BF3 complex in the system to obtain a deoxidized coal-based alpha-olefin fraction section; S2, adding alcohol to the deoxidized coal-based alpha-olefin fraction section to carry out a polymerization reaction; and S3, separating the polymerization reaction mixture to obtain a polymer product and a BF3 complex, removing residual BF3 from the polymer product by flash evaporation and / or steam stripping, separating BF3 gas from the BF3 complex by gas-liquid separation, and returning the BF3 gas separated from the polymer product and the BF3 complex to step S1 for reuse.

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.

[Problem] There is a need for a device that synthesizes methane from hydrogen and carbon dioxide gases, but removes reaction heat and further reduces the progress and temperature of the reaction to improve the conversion rate of methane. [Solution] The present invention uses the powders of chemical heat accumulators magnesium hydroxide and magnesium carbonate as part of the fluid medium of a multi-stage fluidized bed to absorb and store the heat generated during the methanation reaction in the temperature range in which the methanation reaction proceeds, and is able to use the carbon dioxide gas generated from the magnesium carbonate as a raw material gas for the methanation reaction. When the magnesium oxide produced by heat absorption is discharged and regenerated in an external regeneration device, the stored heat is recovered, and the regenerated powder is reintroduced at the highest stage of the multi-stage fluidized bed at a temperature lower than the internal temperature of the device, so that the progress and temperature of the reaction can be reduced as the reaction gas rises through the device, and the conversion rate of the generated methane is improved.

The present invention discloses a method for separating oxygenates from Fischer-Tropsch oil. A gaseous boron halide is introduced into the Fischer-Tropsch oil to cause the boron halide to undergo a complexation reaction with the oxygenates in the Fischer-Tropsch oil, thereby forming a heterogeneous system of the oxygenate complex and the Fischer-Tropsch oil. The heterogeneous system is then separated to obtain a deoxygenated Fischer-Tropsch oil phase and an oxygenate complex phase. The boron halide pressure in the system is 0.05 to 1 MPa. By controlling the amount of boron halide added, the boron halide can be complexed with the oxygenates in the Fischer-Tropsch oil to separate the oxygenates from the oil, while preventing the boron halide from causing polymerization of olefins in the oil.

The present invention relates to a method for preparing a purified benzene composition from a crude hydrocarbon stream containing at least 10% by volume of benzene, comprising the following steps: a) subjecting the crude hydrocarbon stream recycled in step d) and a further benzene-containing stream to a solvent-based extraction to produce a benzene-enriched aromatic stream and a benzene-depleted non-aromatic stream; b) subjecting the benzene-enriched aromatic stream obtained in step a) to hydrodesulfurization to obtain a desulfurized aromatic stream; c) subjecting the desulfurized aromatic stream obtained in step b) to distillation to produce a purified benzene stream and a further benzene-containing stream having a benzene concentration between less than 100% by weight and the azeotropic benzene concentration; and d) at least partially recycling the further benzene-containing stream obtained in step c) to step a).

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 present invention relates to a catalyst for converting diesel and kerosene, which are increasingly likely to be unused, into basic chemical feedstocks, and a method for producing the catalyst. The catalyst includes a porous zeolite having pores and phosphorus (P) supported in the internal pores of the zeolite and on the surface of the zeolite. The phosphorus-supported zeolite has a Lewis acid site number of 20 to 100 μmol / g, and the basic chemical feedstocks are produced by catalytic cracking of a hydrocarbon feedstock having a boiling point of 150°C or higher and 550°C or lower.

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.

The disclosure provides a catalytic process for selective isomerization of 2-ethyl-1-butene in a linear alpha olefin stream that includes feeding a linear alpha olefin stream comprising a linear alpha olefin and 2-ethyl-1-butene to a reactor housing a modified alumina catalyst to isomerize at least a portion of the 2-ethyl-1-butene to cis- or trans-3-methyl-2-pentene, the period during which said feeding occurs being time on stream; withdrawing an effluent from the reactor containing less 2-ethyl-1-butene than the linear alpha olefin stream; and periodically regenerating the modified alumina catalyst by introducing a non-oxidizing environment to the reactor at time on stream intervals of no more than about 200 hours, wherein the reactor is subjected to the non-oxidizing environment for a time period of about 15 hours or greater and wherein the non-oxidizing environment has a temperature of about 250 °C or greater for at least a portion of the time period.

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 relates to the technical field of treatment of trace carbon monoxide in ethylene, in particular to a catalyst for reducing the content of carbon monoxide in ethylene, a preparation method and application. The method comprises the following steps: preparing rare earth element modified alumina; carrying out ball milling treatment on the cobalt-copper-manganese mixture; and carrying out extrusion molding on the ball-milled powder and the modified aluminum oxide. The catalyst prepared by the preparation method can be applied to removal of trace carbon monoxide in ethylene, has the advantages of high precision, large capacity and strong stability, and can deeply reduce the content of carbon monoxide to 0.03 ppm or below.