72 results about "Fractional distillation" patented technology

A geothermally powered petrochemical refining system includes a geothermal system with a wellbore extending from a surface into an underground magma reservoir. A geothermally powered fractional distillation system receives crude oil and produces distillates which are separated by molecular weight. The distillates may be provided to a geothermally powered cracking system that is heated by a heat transfer fluid heated by the geothermal system to crack heavy hydrocarbons into lighter ones. The distillates may be provided to a geothermally powered reforming system that is heated by a heat transfer fluid heated by the geothermal system to reform hydrocarbons into different structures.

The invention discloses a multistage segmented rectification process for anise oil, which comprises the following steps: by taking crude anise oil as a raw material, carrying out multistage segmented rectification on a first-stage tower section, a middle tower section and a last-stage tower section through a rectification tower; wherein the first-stage tower section is used for removing light components, the last-stage tower section is used for refining trans-anethole, and the middle tower section is used for gradually increasing the concentration of the target component trans-anethole by gradually increasing the temperature; regular packing is adopted in the middle tower section, and the used packing is catalytic isomerization packing. The multi-stage segmented rectification process for the anise oil can be used for preparing high-purity and high-yield trans-anethole, and is short in process time, low in energy consumption and suitable for industrial production.

The application discloses a method for selectively extracting metals from waste ternary lithium batteries by using a eutectic solvent. The method uses a eutectic solvent DES synthesized by choline chloride and oxalic acid as an extraction agent, quotes dimethyl sulfoxide DMSO and water as diluents, introduces a circulation and extraction step on the basis of metal element series immersion, i.e. extracts lithium oxalate from the leaching solution with ethanol and recycles the DES by fractional distillation, and makes innovations in recycling of metal lithium and recycling of the DES. The application has the advantages of high efficiency extraction, high precision purification, innovative extraction of lithium element and innovative recovery of the reagent DES.

The present invention discloses a method for co-producing bio-aviation fuel from corncobs, which comprises the following steps: screening and pulverizing corncobs to control the particle size to be 10-15 mm; mixing the pulverized corncobs with furfural production wastewater containing acetic acid for hydrolysis reaction to generate a dilute furfural solution at 195-205 °C and 1.25-1.3 MPa; subjecting the solid residue after hydrolysis to alkali treatment to separate and obtain crude cellulose; subjecting the crude cellulose to acidolysis reaction by microwave heating in a solid acid catalyst and formic acid solution to generate a dilute levulinic acid solution; catalytically polymerizing the dilute furfural solution and the dilute levulinic acid solution under the action of a copper-based catalyst to generate a C10-C15 hydrocarbon mixture; generating a C10-C15 saturated hydrocarbon liquid mixture through oil-water separation and deoxygenation and hydrogenation reaction of a nickel-based catalyst; and finally through fractional distillation and activated carbon filtration; this method realizes the efficient co-production of furfural, cellulose and bio-aviation fuel from corncobs, and has the advantages of high raw material utilization rate, excellent catalytic efficiency, low energy consumption and environmental friendliness.

The utility model belongs to the technical field of segregation kettles, and particularly relates to a segregation kettle freezing and condensing device which comprises a sealing kettle body, a stirring mechanism, a liquid storage cylinder, a liquid collecting cylinder and a cooling winding pipe penetrating through the liquid storage cylinder and the liquid collecting cylinder. Through linkage of the first magnetic block, the second magnetic block and the sliding block, a cooling water circulation area in the cooling winding pipe is dynamically matched with the material liquid level in the kettle, so that the temperature in the kettle can be effectively reduced when the segregation reaction temperature rises, and invalid cooling of the high-position winding pipe is reduced when the liquid level drops; therefore, the cooling efficiency is improved, the energy consumption is reduced and the stability of reaction conditions is ensured.

The present invention relates to a method for preparing high-performance coal-based needle coke by pyrolysis. The method uses coal tar pitch as the raw material, adds a polymerization promoter containing sulfur elements for thermal polymerization soaking, and then raises the temperature for pyrolysis. The raw material after pyrolysis is separated by flash evaporation to separate the heavy-phase asphalt and the raw material asphalt. The raw material asphalt is further separated by fractional distillation to separate the polymerization promoter and produce refined asphalt. The refined asphalt is calcined by coking to obtain a needle coke product. The present invention pre-treats the raw material by means of high-temperature soaking pyrolysis, effectively retains all beneficial components in the coal tar pitch, and the prepared needle coke has low sulfur and low CTE, and the quality is stable.

The invention relates to the technical field of plant essential oil extraction, and discloses a valerian-rich rhizoma nardostachyos essential oil directional preparation process, which comprises: taking a functionalized compound solvent, adding rhizoma nardostachyos coarse powder according to a liquid-solid ratio, stirring and soaking to obtain a solid-liquid mixture; the solvent component comprises process water, sodium xylene sulfonate, dipotassium phosphate and polyethylene glycol 400; introducing steam into the mixture, heating to maintain slight boiling, carrying out first-stage distillation, and removing distilled low-boiling-point components to obtain resident in the kettle; cooling the resident to a constant temperature, adding sodium chloride, and stirring until the sodium chloride is dissolved to obtain a heterogeneous mixed system; the heating system is subjected to second-stage distillation, and distillate is collected; and carrying out oil-water separation on the distillate, and collecting an oil phase to obtain a finished product of the rhizoma nardostachyos essential oil. According to the method disclosed by the invention, a hydrotropy-salting-out phase change mechanism is matched with fractional distillation, so that high-efficiency desorption and directional enrichment of valerianone which is difficult to volatilize are realized while acidic and light component impurities are removed.

This invention relates to a rich-oil benzene removal tower for fractional distillation, specifically in the field of benzene removal tower technology. It includes a reboiler, a tower body, and a tower top. One side of the tower body is connected to a rich-oil pipeline and a steam pipeline, while the other side is connected to a naphthalene oil collection tank. A partition plate for separation is installed inside the tower body, with a receiving tray and downcomer on both sides of the partition plate to guide the liquid flow. The reboiler is connected to the tower body and is connected to a lean-oil pipeline. The tower top is connected to a crude benzene pipeline, which in turn connects to a reflux tank. The reflux tank is connected to the crude benzene storage tank and the inner cavity of the tower top. The crude benzene storage tank is connected to the tower body via a liquid phase distribution pump. In this invention, the partition plate within the tower body allows rich-oil to be fed from one side of the partition plate, while high-concentration naphthalene oil is collected from the other side. The benzene removal tower does not need to operate in conjunction with a naphthalene removal tower; the tower body can simultaneously remove high-concentration naphthalene oil (greater than 50%) while removing benzene, thereby reducing the naphthalene content in the lean oil and improving the naphthalene washing effect.

A system and methods for distillation and recovery of ethylene from a cracked hydrocarbon feed material, including a fractional distillation column having a series of trays and multiple distillation outlets, each located at a different tray location or level along the fractional distillation column. The fractional distillation column is controlled to optimize the output of ethylene, including altering operation of the fractional distillation column to enable extraction of streams of ethylene of different selected purity levels and in different phases from the fractional distillation column.

The invention relates to a method for producing a label-free aromatic process oil from a pyrolysis oil from used tires. The method has the steps of distilling the pyrolysis oil from used tires in a fractional distillation process, wherein at least one low-boiling fraction, at least one high-boiling fraction, and optionally an atmospheric residue are obtained; and selectively hydrogenating the at least one high-boiling fraction or the atmospheric residue with hydrogen, a label-free aromatic process oil being obtained. The invention further relates to a label-free aromatic process oil and to the use of the process oil in tires or rubber mixtures.

The invention relates to a method for producing a non-hazardous aromatic process oil from a tyre pyrolysis oil. The method comprises the steps of distilling the tyre pyrolysis oil using fractional distillation, with at least one low-boiling fraction and at least one high-boiling fraction being obtained, mixing the at least one high-boiling fraction with solvent as an extractant and extracting it, an aromatic oil being obtained as the raffinate. The invention further relates to a non-hazardous aromatic process oil and to the use of the process oil in tyres or rubber mixtures.

The invention discloses a waste new energy battery crushing and sorting method. The method comprises the following steps that S1, a waste battery and a lithium hydroxide catalytic infiltration material are subjected to vacuum low-temperature freezing and disassembling; s2, neutralizing the lithium-containing precipitate by using an acidic solution to generate anhydrous lithium salt, absorbing the waste gas by using hydrogen fluoride, and synthesizing a precursor by using phosphorus pentafluoride; s3, performing vacuum fractional distillation, and separating low / high boiling point components by a three-way valve; s4, gradient freezing crystallization is conducted, crystals and mother liquor are centrifugally separated at the temperature of-20 DEG C to-50 DEG C at the speed of 1 DEG C / min to 5 DEG C / min, and S5, performing low-temperature vacuum drying on the crystal, and removing moisture and the organic solvent to obtain high-purity lithium hexafluorophosphate; s3, separating a low-boiling-point organic solvent and a high-boiling-point component by utilizing a temperature gradient in a vacuum environment, and preliminarily enriching a target product; in the S4 stage, the crystal precipitation rate is controlled through gradient cooling, so that lithium hexafluorophosphate preferentially forms high-purity crystals, efficient separation of the crystals and mother liquor is achieved in combination with a centrifugal separation technology, and the product purity is guaranteed through the synergistic effect of fractional distillation and gradient freezing.

This invention discloses a method for preparing wild jujube (Gnaphalium affine) essential oil that cannot be chemically replicated, belonging to the field of natural plant essential oil extraction technology. The method includes whole-plant cleaning pretreatment, low-temperature slicing, low-temperature fine crushing, low-pressure fractional distillation, graded condensation collection of aromatic fractions, separation, low-temperature aging, and filtration steps. This invention, through low-temperature slicing and fine crushing pretreatment combined with low-pressure fractional distillation at 0.02–0.08 MPa and no higher than 45°C, along with gradient condensation and low-temperature aging at 2–8°C, maximizes the preservation of natural synergistic trace components in the wild jujube essential oil. In gas chromatography-mass spectrometry (GC-MS) analysis, the obtained essential oil exhibits a characteristic aroma component retention rate ≥90% and contains at least three undisclosed natural synergistic trace components, whose aroma and activity cannot be completely replicated through chemical flavoring. This invention's process is mild and efficient, suitable for large-scale production, and provides a high-value-added pathway for the deep processing of wild jujube.

The present invention relates to the technical field of separation of direct coal liquefaction oil, and provides a method for separating and purifying monocyclic aromatic hydrocarbons from direct coal liquefaction oil. The method comprises: (1) performing fractional distillation and composition analysis on direct coal liquefaction oil to determine a fraction having the highest content of monocyclic aromatic hydrocarbons; (2) removing low-carbon alkanes and cycloalkanes from a selected fraction by means of column chromatography; (3) separating toluene, a monocyclic aromatic hydrocarbon mixture, and high-carbon alkanes by means of an atmospheric and vacuum distillation column; (4) purifying ethylbenzene from the monocyclic aromatic hydrocarbon mixture by means of an extractive distillation column; and (5) purifying p-xylene by means of a solvent recovery column. The separation method provided by the present invention can make full use of the composition characteristics of direct coal liquefaction oil to obtain two or three high-purity monocyclic aromatic hydrocarbon monomers at a time without introducing additional chemical reaction steps, showing significant economic and environmental benefits.

The application discloses a method for cracking tar into high value-added products, which adopts a route of separating light components by fractional distillation and then hydrogenating heavy components, so that the yield of target products can be affected by hydrogenation of naphthalene, methyl naphthalene and the like below 250 DEG C in the process of hydrocracking, and on the other hand, the components below 250 DEG C account for about 30% to 50%, so that the hydrogen consumption in the subsequent hydrocracking can be reduced by separating the components in advance. After the heavy fraction is subjected to hydrocracking, part of polycyclic aromatic hydrocarbons in the heavy fraction can be cracked into part of monocyclic aromatic hydrocarbons, which can be used for producing aromatic solvent oil, so that the light fraction in the hydrocracking product is separated and mixed into the light fraction generated by pre-fractionation, and the next step processing is carried out, so that the yield of high value-added products can be further improved.

The purification of monoalkyl tin trialkoxides and monoalkyl tin triamides are described using fractional distillation and / or ultrafiltration. The purified compositions are useful as radiation sensitive patterning compositions or precursors thereof. The fractional distillation process has been found to be effective for the removal of metal impurities down to very low levels. The ultrafiltration processes have been found to be effective at removal of fine particulates. Commercially practical processing techniques are described.

The apparatus includes a distillation vessel configured to receive the mixture. The apparatus includes a column fluidly connected to the distillation vessel. A mesh is disposed in the column. The apparatus includes a plurality of conduits fluidly connected to respective vacuums. A fractionation top is fluidly connected to the column. The column is fluidly connected between the distillation vessel and the fractionation top.

The application provides a purification method of medium / long carbon chain triglyceride, and relates to the technical field of chemical engineering.The ion liquid is mixed with a polar diluent to obtain an extractant; the ion liquid comprises an anionic surface active ion liquid, a cationic surface active ion liquid or an anion-cation surface active ion liquid; the medium / long carbon chain triglyceride raw material is dissolved in a weakly polar organic solvent to obtain a raw material liquid; the raw material liquid is subjected to liquid-liquid extraction by using the extractant to obtain a raffinate phase, and the raffinate phase is subjected to distillation, and the residue is the medium / long carbon chain triglyceride; the liquid-liquid extraction comprises cross-flow extraction, countercurrent extraction or fractional distillation extraction.The purification method provided by the application has the advantages of simple process, simple operation, low cost, large processing capacity, high purification efficiency, high purity and high yield of the medium / long carbon chain triglyceride.

The present application relates to a kind of liquefied petroleum gas continuous deep desulfurization method, system, the method includes: (1) make liquefied petroleum gas and extract lye contact and carry out alkali extraction, obtain first liquefied petroleum gas product and sulfidic alkali liquor;(2) make sulfidic alkali liquor and oxidizing gas contact, obtain to be separated material;(3) make to be separated material separation, obtain remaining oxidizing gas and contain disulfide alkali liquor;(4) make contain disulfide alkali liquor and carry out back extraction, obtain contain disulfide selective solvent and regenerated lye;(5) make at least part first liquefied petroleum gas product and carry out fractional distillation, make mixed carbon four above fraction and carry out decarburization five fraction distillation and obtain carbon five fraction;Selective solvent in step (4) includes carbon five fraction and a part of contain disulfide selective solvent.The present application significantly reduces the sulfur content of liquefied petroleum gas, substantially improves the effective utilization rate of alkali for extraction, converts carbon five fraction existing in liquefied petroleum gas into gasoline fraction and utilizes.

The process allows for the separation of the liquid hydrocracking stream from the liquid hydrogen isomerization stream, and thus the preservation of heat in the hydrocracking stream. Preserving heat in the hydrocracking stream avoids the need to reheat the hydrocracking stream before product fractional distillation. In particular, kerosene in the hydrocracking stream is not cooled in the hydrogen isomerization stream and is then reheated in fractional distillation for distillation of kerosene-range hydrocarbons from diesel-range hydrocarbons.

The invention relates to the technical field of chemical synthesis, in particular to a method for preparing deuterium acetone through exchange reaction, which comprises the following steps: S1, removing water from acetone; s2, feeding the dehydrated acetone, heavy water, deuterium oxide and a catalyst, and carrying out cooling reflux; s3, carrying out fractionation, and collecting a middle fraction; and S4, calculating the weight of the heavy water and deuterium oxide which are added again according to the collected medium fraction, performing cooling reflux again, performing fractionation, and collecting the medium fraction to obtain the deuterium oxide. The raw material acetone is dewatered and reused, so that the concentration of heavy water can be effectively prevented from being diluted when the raw material acetone is contacted with the heavy water, and the deuteration degree of the product is reduced.

The invention belongs to the technical field of organic synthesis, and discloses a preparation process of electronic-grade bis (tert-butylamino) silane. The preparation process comprises the following steps: filling a composite catalyst and tert-butylamine into a high-pressure reaction kettle, sealing, replacing with an argon atmosphere, introducing monosilane, stirring and reacting in the argon atmosphere, cooling, filtering, and fractionating filtrate to obtain a crude product; and then carrying out supercritical carbon dioxide extraction on the crude product by using anhydrous isopropanol, carrying out rotary evaporation to remove isopropanol, dissolving in anhydrous acetonitrile, electrolyzing, carrying out secondary filtration, and carrying out fractionation treatment on the filtrate to obtain the electronic-grade bis (tert-butylamino) silane. By adding the composite catalyst and introducing the treatment processes such as supercritical carbon dioxide extraction, the product purity and the reaction yield of the bis (tert-butylamino) silane preparation process are effectively improved, and the content of chlorides and metal impurities of the product is reduced at the same time. Therefore, the method has a wider application prospect.

The application discloses a continuous catalytic esterification preparation method of high-purity polyglycerol fatty acid ester, which comprises the following steps: continuously feeding raw glycerol into a continuous polymerization reaction unit composed of reactors connected in multiple stages, and performing polycondensation reaction in the presence of a fixed-bed solid alkali catalyst to obtain polyglycerol; continuously feeding the obtained polyglycerol and fatty acid into a continuous esterification reaction unit composed of thin-film evaporation reactors connected in multiple stages, and performing esterification reaction under a reduced pressure condition to obtain polyglycerol fatty acid ester crude product; continuously feeding the obtained polyglycerol fatty acid ester crude product into a continuous separation and purification unit composed of molecular distillation devices connected in multiple stages, and performing fractional distillation to obtain high-purity polyglycerol fatty acid ester product; and the production efficiency is significantly improved by adopting a continuous reaction mode and a thin-film evaporation reactor with high heat and mass transfer efficiency.

The invention relates to a preparation method of carbonyl fluoride and trifluoromethylsulfonyl fluoride, which comprises the following steps: reacting tetrafluorosultone with fluorine gas to obtain products carbonyl fluoride and trifluoromethylsulfonyl fluoride. According to the preparation method, the reaction conditions are mild, high-temperature and high-pressure equipment is not needed, the equipment investment and the operation cost are reduced, and meanwhile, the safety of the production process is also improved; the method is carried out under an anhydrous condition, is free of waste water, and is green and environment-friendly; the raw materials tetrafluorosultone and fluorine gas are low in cost and wide in source, and favorable conditions are provided for large-scale production; the separation method adopted by the product is simple and effective, efficient separation and purification of the product can be realized through fractionation, complex separation steps and expensive separation equipment are reduced, the production cost is further reduced, and the method is suitable for industrial production; according to the method, high-selectivity synthesis of carbonyl fluoride and trifluoromethylsulfonyl fluoride is realized, the product yield is high, the purity is high, and the application requirements in different fields can be met.

This application relates to a fractional distillation and upgrading method for rose hydrosol based on online monitoring and the resulting base water, belonging to the field of high-end cosmetic raw material preparation and deep processing technology of natural products. It includes: S1, primary distillation and intelligent fractionation with online monitoring; S2, directional chemical conditioning of the core fraction; and S3, low-temperature vacuum secondary distillation. By introducing online process analysis technology based on conductivity and refractive index, the chemical purity, active ingredient concentration, and aroma characteristics of each batch of base raw materials are ensured to be highly consistent. Furthermore, during the conditioning stage, L-arginine, low molecular weight sodium hyaluronate, and modified ethylene glycol synthesized by enzymatic method are introduced, dynamically assembling into a multi-layered, supramolecularly stable system in the liquid phase, thereby achieving high retention rates during low-temperature distillation.

The invention provides a temperature self-adaptive control method and system for triazole segmented rectification, and the method comprises the steps: collecting the temperature data of a first temperature sensor installed at a first target segment of a rectification tower, and determining a first control logic according to the temperature data; collecting purity data of an online refractometer mounted on a second target section of the rectifying tower, and determining a second control logic according to the purity data; and according to the first control logic and the second control logic, temperature self-adaptive control of triazole segmented rectification is carried out. According to the temperature self-adaptive control method and system for triazole segmented rectification, the heating power and the reflux ratio are adjusted in real time according to the temperature change of the lower segment, heat tracing temperature compensation is carried out according to the formamide purity of the upper segment, water and formamide after triazole reaction are efficiently separated, and the risk that formamide is decomposed at the temperature of 180 DEG C or above is avoided. In addition, the self-adaptive control response is far faster than manual adjustment, and the process stability is improved.

A geothermally powered petrochemical refining system includes a geothermal system with a wellbore extending from a surface into an underground magma reservoir. A geothermally powered fractional distillation system receives crude oil and produces distillates which are separated by molecular weight. The distillates may be provided to a geothermally powered cracking system that is heated by a heat transfer fluid heated by the geothermal system to crack heavy hydrocarbons into lighter ones. The distillates may be provided to a geothermally powered reforming system that is heated by a heat transfer fluid heated by the geothermal system to reform hydrocarbons into different structures.

The invention discloses a separation and purification method of dimethyl terephthalate, which comprises the following steps: mixing crude terephthalic acid and methanol, and adding a catalyst for esterification reaction to obtain a thermal esterification product; filtering to obtain esterification liquid A; adding a water absorbent into the esterification liquid A, and filtering to obtain esterification liquid B; adding activated carbon into the esterification liquid B, and filtering to obtain esterification liquid C; distilling the esterification liquid C, and removing and recovering methanol to obtain esterification liquid D; and sequentially carrying out two times of fractionation on the esterification liquid D, and cooling, crystallizing and drying a secondary fractionation product to obtain a separated and purified product. The water absorbent is used for removing moisture in the esterification liquid, so that the situation that the esterification efficiency is reduced when the subsequently recycled methanol is subjected to esterification reaction cyclic utilization due to the moisture in the subsequently recycled methanol is avoided; the method disclosed by the invention is simple in process, low in equipment cost, low in energy consumption and high in product purity.

A method for purifying polyhydric alcohol, according to the present invention, as a method with high efficiency and removal capacity for decolorizing and deodorizing polyhydric alcohol, comprises the steps of preparing a mixed solution containing polyhydric alcohol, and performing concentration, fractional distillation, water supply, stripping treatment, and distillation, whereby off-color and off-odor substances contained in the polyhydric alcohol can be efficiently removed.

The present application belongs to the technical field of energy products, and particularly relates to a method for upgrading coal pitch and oil sludge by co-pyrolysis and a carbon black raw material, comprising the following steps: S1, pre-degradation: degrading organic alkali, thick oil ester, inorganic heavy metal ions and fillers in the oil sludge by actinomycetes and bacillus; the classification name of the bacillus is Bacillus arthriticus, the preservation address is China Center for Type Culture Collection, and the preservation number is CCTCC NO: M20232038; S2, co-pyrolysis: co-pyrolyzing the oil sludge after pre-degradation in step S1 under oxygen-rich fuel gas and carbon black tail gas CO2 and coal pitch, and obtaining a derivative. Through pre-degradation, co-pyrolysis, fractional distillation or reaction rectification, the utilization rate of oil product resources of the waste oil sludge is 85-90%, and the remaining 10-15% is used as filler carbon black.