132results about "Extraction purification/separation" patented technology

The invention relates to the technical field of chemical separation and purification, and discloses a method for separation and purification of taxadiene from tobacco and GC-MSMS quantitative detection.The method for separation and purification of taxadiene from tobacco comprises the following steps that S1, tobacco leaves are made into powder, an extracting agent is added, ultrasonic extraction is conducted for multiple times, and extract liquor is obtained; s2, evaporating the extract to dryness, adding an organic solvent, and dissolving to form a concentrated solution; s3, the concentrated solution is added into a silica gel column for gradient elution, and an extraction sample is obtained; and S4, evaporating the extracted sample to dryness, adding acetonitrile for dissolving, and carrying out secondary recrystallization to obtain purified taxadiene. According to the method, the efficiency and purity of separating the taxadiene from the tobacco are improved, and the taxadiene is accurately quantified.

The invention relates to a device and a method for preparing isobutene and methanol by cracking methyl tert-butyl ether. The device comprises a methyl tert-butyl ether vaporization refining tower, a reactor, a cooling tower, an absorption tower, a methanol extraction tower, an isobutene light component removal tower and an isobutene heavy component removal tower which are sequentially connected along a material conveying direction, a top discharge hole of the cooling tower is connected with a lower gas-phase material inlet of the absorption tower; an absorbent outlet at the bottom of the absorption tower is circularly connected with a cooling absorption liquid inlet at the top of the cooling tower; the bottom extract liquor outlet of the methanol extraction tower is circularly connected with the top absorbent inlet of the absorption tower; an isobutylene discharge hole is formed in the top of the isobutylene heavy component removal tower; the device further comprises a methanol recovery tower and a methanol refining tower which are connected in sequence along the material conveying direction; a bottom cooling absorption liquid outlet of the cooling tower is connected with the methanol recovery tower; a methanol discharge hole is formed in the bottom of the methanol refining tower. The device provided by the invention not only can relax the limitation of the purity of methyl tert-butyl ether in raw materials, but also can prepare high-purity isobutene and high-purity methanol at the same time.

The present invention relates to a method for producing farnesene oil, the method comprising the use of a raw material fermentation yeast in a fermentation vessel to produce a whole cell culture fluid (WCB); and adding a surfactant to the fermentation vessel to reduce emulsification within the fermentation tank.

The invention belongs to the technical field of petrochemical engineering and fine chemical engineering separation, and discloses a method and device for separating alpha-olefin and isomers thereof by using metal-based ionic liquid and application, and the method comprises the following steps: mixing a raw material solution containing target alpha-olefin with an extraction agent; performing liquid-liquid extraction; after standing and layering, respectively collecting an extraction phase and a raffinate phase; components in the extraction phase and the raffinate phase are qualitatively and quantitatively analyzed, and the partition coefficient, the separation selectivity and the purity are evaluated; and analyzing the target alpha-olefin in the extraction phase, and recovering through a reduced pressure rotary evaporation process. According to the method, the metal-based ionic liquid with dual effects of pi-complexation and spatial recognition is introduced as the extraction agent, so that high-selectivity recognition and enrichment of the target normal alpha-olefin are realized, interference of internal olefin, branched olefin and saturated isoparaffin is effectively inhibited, and the purity and selectivity of the target component are remarkably improved.

The invention relates to the field of fermentation product extraction methods, in particular to a method for efficiently extracting intracellular products. According to the method, staged extraction and ultrasound are combined to be applied to intracellular product extraction, and the extraction rate can be obviously increased. After thalli in fermentation liquor are crushed, a non-polar solvent is adopted for first extraction, and ultrasonic short-time low-temperature treatment is adopted in the extraction process, so that the extraction efficiency of a target product can be obviously improved, a polar solvent is added into an extraction phase of the first extraction in second extraction, and ultrasonic short-time low-temperature treatment is performed again, so that the extraction amount of intracellular products is increased; the process does not need complex equipment, is short in operation time consumption and high in extraction efficiency, and is suitable for large-scale industrial production.

The present invention relates to a method and device for separating aromatic compounds from a feed (1) comprising a mixture of aromatic and non-aromatic compounds, wherein aromatics are extracted from the feed (1) in a liquid-liquid extractor (T1) fed with a solvent (2) to produce at least one extract (4) concentrated in aromatic compounds relative to the feed (1), and one raffinate (3) concentrated in non-aromatic compounds relative to the composition of the feed (1); and wherein the liquid-liquid extractor (T1) is fed with all of a recycle of the extract (5) at one or more positions of the liquid-liquid extractor (T1) disposed between a feed point (1) and a solvent feed point (2). Figure 3 to be published

The invention discloses a double-solvent extraction method in an organic solution, and belongs to the technical field of solvent extraction methods in organic solutions. The method comprises the following steps: mixing an original solution with a solvent S1 serving as an organic extraction agent and a solvent S2 serving as an inorganic extraction agent to obtain a solution 1; after the solution 1 is subjected to multiple times of step-by-step extraction, an extraction phase E1, an extraction phase E2 and a raffinate phase R are generated respectively; and separating the extract liquor to respectively obtain extract liquor E01, extract liquor E02 and raffinate R0. The method disclosed by the invention is simple and rapid to operate, good in selectivity, good in separation effect, relatively high in extraction rate, capable of obtaining a relatively pure solvent, wide in application range and capable of effectively separating organic matters and inorganic matters in an organic solution at the same time.

The invention relates to the technical field of hydrocarbon synthesis, and discloses a solvent-free synthesis process of a high-purity alpha-methylstyrene linear dimer, which comprises the following steps: mixing a monomer and a catalyst for reaction, cooling the reaction system to a preset dynamic viscosity interval, introducing micron-sized deionized water as a polar induction core by using an atomization device, and carrying out reaction to obtain the high-purity alpha-methylstyrene linear dimer. According to the method, the micro-emulsification steady state of a solvent-free system is broken by utilizing an interface directional capture mechanism, residual catalytic centers in the organic phase are physically removed, and the catalytic activity of the solvent-free system is improved, so that the catalytic activity of the solvent-free system is improved, and the catalytic activity of the solvent-free system is improved. The mechanism eliminates the technical risk that the catalyst is decomposed to generate hydrogen fluoride in the rectification process, prevents the pyrolysis rearrangement of linear products to cyclic isomers, and ensures the purity of medical intermediates.

The invention provides a preparation method and device of a polycyclic aromatic hydrocarbon oligomer, and the preparation method comprises the following steps: 1) carrying out polymerization reaction on raw materials comprising a polycyclic aromatic hydrocarbon compound, an acidic ionic liquid catalyst and a solvent to obtain a reaction system; 2) carrying out extraction treatment on the reaction system by adopting an extraction agent to obtain an extraction phase containing a polymer and a raffinate phase containing an acidic ionic liquid catalyst; the solvent and the extracting agent respectively and independently comprise at least one of benzene and benzene homologues. The preparation method can significantly reduce the usage amount of acid liquor or alkali liquor, and is beneficial to environmental protection; according to the preparation method, the catalyst cannot be inactivated, the catalyst can be repeatedly used, and the industrial cost is effectively reduced.

According to a first aspect, the present invention relates to a process and apparatus for the production of aromatic compounds, in which the raffinate (16) from an aromatic extraction unit (14) is sent to a dedicated catalytic reforming unit (17) to produce a reformate effluent (18), which is successively treated by: a recontacting section (4) to separate hydrogen (5); a stabilization section (7) to separate C1-C2 hydrocarbon compounds (8) and C3-C4 or C3-C5 hydrocarbon compounds (9); and a reformate separation column (11) to separate a C6-C8 fraction (12) and a C8+ fraction (13), the C6-C8 fraction (12) being sent back to the aromatic extraction unit (14). The present invention also relates to a method for modifying an existing apparatus for the production of aromatic compounds, comprising installing the process according to the first aspect in the existing apparatus. Figure 1 to be published

The invention relates to the technical field of sizing agent preparation, in particular to a method for preparing an ASA sizing agent based on enhanced olefin isomerization. Comprising the following steps: step 1, deep pretreatment of alpha-olefin; 2, preparing a composite catalyst; step 3, field-enhanced isomerization reaction; step 4, precisely purifying internal olefin; 5, solvent-free ASA closed-loop synthesis is carried out; and 6, ASA targeted post-treatment: cooling the product in the step 5, adding amino modified graphene to adsorb residual maleic anhydride, filtering, carrying out gradient cooling crystallization on the filtrate according to a set rate, and filtering to obtain a high-purity ASA sizing agent crystal. Through deep pretreatment of the alpha-olefin, the content of heavy metal ions in the straight-chain alpha-olefin can be controlled to be less than or equal to 0.05 ppm, and the content of mercaptan impurities can be controlled to be less than or equal to 0.05 ppm; by combining the design of recycling unreacted alpha-olefin through supercritical CO2 extraction and circulating the unreacted alpha-olefin to the step 1, the consumption of the alpha-olefin raw material can be reduced, and the utilization rate of the raw material is high.

The utility model relates to the technical field of chemical equipment, and particularly discloses a device for prolonging the service life of a hydrogenation catalyst. Comprising a water scrubber used for washing raw materials, a wastewater pipeline used for discharging wastewater is arranged at the bottom of the water scrubber, a benzene recovery pipeline used for feeding is arranged on the lower side of the water scrubber, a water supply unit used for feeding a water source into the water scrubber is arranged on the upper side of the water scrubber, and a benzene discharge pipeline used for discharging benzene is arranged on the right upper side of the water scrubber. According to the characteristic that an extracting agent is decomposed when meeting water and is dissolved in water, the water washing tower is additionally arranged before recycled benzene enters the reactor, waste water generated after dehydration of the dehydrating tower is fully utilized to wash the recycled benzene, the extracting agent carried in the recycled benzene is removed, and the recycled benzene is recycled. Consumption of the hydrogenation catalyst is reduced, and loss of the hydrogenation catalyst is avoided.

The application discloses a process for preparing high-carbon internal olefins from Fischer-Tropsch oil, which comprises the following steps: a, Fischer-Tropsch oil enters a first vacuum tower for vacuum rectification, a fraction with carbon number greater than or equal to 16 enters a second vacuum tower for vacuum rectification, and enters an extraction tower for extraction; b, a first mixture containing the fraction with carbon number of 16-18, an extractant and an oxygen-containing compound enters a first rectification tower for rectification; c, a second mixture containing the fraction with carbon number of 16-18 and the oxygen-containing compound enters an adsorption tower for adsorption; d, a third mixture containing the fraction with carbon number of 16-18 and the oxygen-containing compound is output from the top of the adsorption tower and enters an isomerization reactor for reaction to obtain a target product. The process for preparing high-carbon internal olefins from Fischer-Tropsch oil provided by the application effectively avoids the loss of alpha-olefins in Fischer-Tropsch oil, has the advantages of low energy consumption, low cost and good economy, and the content of the oxygen-containing compound in the target product is low.

The application discloses a method for separating squalene from a plant oil deodorization distillate, which comprises mixing the plant oil deodorization distillate containing squalene with a first solvent to obtain a raw material liquid, and performing fractional extraction on the raw material liquid by taking a second solvent as an extractant and a third solvent as a washing agent, wherein the first solvent is selected from one or more of non-polar solvents and weakly polar solvents, the second solvent is selected from one or more of polar solvents, and the third solvent is selected from one or more of non-polar solvents and weakly polar solvents. The fractional extraction method has the advantages of large processing capacity, high product purity and recovery rate, low energy consumption and cost, easy amplification and the like, and is suitable for industrial production.

A method for preparing a hydrocarbon stream for oligomerization is provided. The method uses a stripping column to strip dimethyl ether from an olefin stream. Lighter olefins, such as C3-olefins, are also removed. The C4+ olefins can then be sent for further processing, including selective hydrogenation followed by oligomerization.

The invention provides a method and a system for recycling crude toluene waste oil, and in the method and the system, a flocculating agent is added into the crude toluene waste oil, so that polyol ketone and solid catalyst particles in the crude toluene waste oil are subjected to a flocculation reaction, and supernatant liquid rich in toluene and solid fuel are formed. And the supernatant is extracted by dichloromethane and evaporated to obtain methylbenzene, so that methylbenzene recovery is realized, and the production cost is reduced. The solid fuel is conveyed to a coal yard to be fully mixed with pulverized coal and then combusted, the combustion performance of the pulverized coal is improved, and profits are brought to enterprises.

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 invention belongs to the technical field of petrochemical industry, and discloses an energy-saving method and device for refining 1-butene from etherified C4. The method comprises the following steps: carrying out selective hydrogenation on etherified C4 to remove butadiene, feeding the etherified C4 into a pretreatment tower adopting a heat pump technology for primary separation, and extracting a fraction rich in 1-butene from a side line; the fraction enters an extractive distillation tower, and efficient separation of 1-butene and butane is achieved by adding an extractant; the rich solution containing 1-butene is separated by a product tower to obtain a high-purity 1-butene product; and the high-temperature lean solvent extracted from the bottom of the product tower sequentially flows through a plurality of heat exchange devices such as an intermediate reboiler of the extractive distillation tower, a second reboiler of the pretreatment tower, a raw material preheater and the like, and is recycled after waste heat is fully recovered. The invention also provides an alternative scheme for additionally arranging the solvent recovery tower and a corresponding device. The process flow is reasonable, the energy integration level is high, the consumption of steam and cooling water can be greatly reduced, and the obvious energy-saving effect and economical efficiency are achieved.

The present invention relates to a method and device for separating aromatic compounds from a feed (1), the feed comprising a mixture of aromatic and non-aromatic compounds, wherein aromatic compounds are extracted from the feed (1) in a liquid-liquid extractor (T1) supplied with a solvent (2) in order to produce at least one extract (4) concentrated in aromatic compounds relative to the feed (1), and a raffinate (3) concentrated in non-aromatic compounds relative to the composition of the feed (1); and wherein the liquid-liquid extractor (T1) is supplied with the entirety of an extract recycle (5) at one or more positions in the liquid-liquid extractor (T1) arranged between a feed point for the feed (1) and a feed point for the solvent (2).

The utility model discloses a device for producing isopentene by cracking tert-amyl methyl ether. The device comprises a multiphase mixer, an oil-water separator, a water scrubber, an isomerization reactor, an isoamylene refining tower and a methanol recovery tower, the multiphase mixer performs multiphase mixing on raw materials and water, and an outlet of the multiphase mixer is connected with an inlet of the oil-water separator; the water phase is input into a methanol recovery tower, and the oil phase crude isopentene is input into a water scrubber; methanol in the oil-phase crude isopentene is extracted into water by the water washing tower, a tower bottom material is conveyed to a methanol recovery tower, and the washed oil-phase crude isopentene enters an isomerization reactor; an outlet of the isomerization reactor is connected with an inlet of the isopentene refining tower, and the isopentene refining tower is used for refining a product; and the methanol recovery tower is used for separating methanol from water. Most methanol in a reaction product is separated out through oil-water separation, and the use amount of subsequent washing water is reduced, so that the treatment capacity of the methanol recovery tower is reduced, and the purpose of reducing the operation cost of the device is achieved.

The present disclosure is directed to 1,3-butadiene extraction and steam cracking recovery systems, more particularly, to systems and methods for removing tar from the solvent loop of such systems using a membrane.

The invention provides a method for separating and purifying squalene from squalene fermentation liquor, and belongs to the technical field of biosynthesis. The method comprises the following steps: (1) pretreatment: carrying out wall breaking on squalene fermentation liquor or concentrated liquor of the squalene fermentation liquor, carrying out solid-liquid separation after wall breaking to obtain mushroom dregs, and drying the mushroom dregs to obtain dry mushroom dregs; (2) extraction: adding an organic solvent into the dry mushroom dregs for extraction, carrying out solid-liquid separation to obtain mushroom dregs and an organic phase, and collecting the organic phase; (3) primary distillation: adding an aqueous solution into the organic phase, layering to obtain an aqueous phase and an organic phase, collecting the organic phase, and distilling to obtain a crude product; and (4) secondary distillation: distilling the obtained crude product to obtain purified squalene. The method is simple to operate, less in equipment investment, simple in post-treatment and low in extraction cost, and the obtained squalene product is high in yield, high in purity and suitable for industrialization.

The present invention relates to a column for the liquid-liquid extraction of a feedstock by an extraction solvent, comprising perforated trays (Pi) for the passage of a dispersed phase (B), the perforated trays being spaced apart by an inter-tray space (8), and comprising spillways (6), a spillway being a hole allowing the passage of a continuous phase (A) through a perforated tray, the extraction column (1) alternately comprising perforated trays of type I having two peripheral spillways, and perforated trays of type II having a single central spillway, wherein: the cross-section S2 of the central spillways is larger than the cross-section S1 of the peripheral spillways, cross-section S1 corresponding to the sum of the cross-sections of the two peripheral spillways. The present invention also relates to a liquid-liquid extraction method using said liquid-liquid extraction column.

The application discloses a method for separating C9~C 15 Monomer alpha-olefins, comprising the following steps: 1) high-temperature Fischer-Tropsch synthesis oil is cut by fractionation; 2) C9~C 15 The fraction is subjected to extraction deoxygenation and dearomatization by using a composite solvent to obtain C9~C 15 Alkyl olefin material and oxygen-rich and aromatic-rich material; 3) C9~C 15 Alkyl olefin material is subjected to alkyl olefin separation by using a metal-modified molecular sieve adsorbent and a simulated moving bed to obtain C9~C 15 Mixed olefins and mixed alkanes; 4) C9~C 15 Mixed olefins are subjected to normal and isomeric olefin separation by using a silicalite or ZSM-5 molecular sieve as an adsorbent and a simulated moving bed to obtain C9~C 15 Normal olefins and C9~C 15 Isomeric olefins; 5) C9~C 15 Normal olefins are cut by fractionation to obtain monomer alpha-olefins in sequence. The method is simple in process and can efficiently separate monomer alpha-olefins with high carbon.

Metal-containing ionic liquids can demonstrate a sharply increased viscosity relative to the same ionic liquids without the metal cation. Metal-containing ionic liquid compositions are disclosed that contain viscosity modifiers that reduce viscosity. Metal-containing ionic liquids are applicable to methods and within systems designed for the purpose of removing and recovering certain components of process streams such as ethylene, isobutane, or both. Methods for removing and recovering ethylene from process streams are also disclosed herein as having increased ethylene removal capacity concurrently with reductions in viscosity without corresponding reductions in metal cation concentrations.

The invention provides a method for obtaining high-purity naphthalene by extracting and removing sulfurindene. The method comprises the following steps: step 1, mixing industrial naphthalene and a solvent according to a preset proportion to obtain a solid-liquid mixture; 2, grinding the solid-liquid mixture to obtain naphthalene powder slurry; and 3, carrying out solid-liquid separation on the naphthalene powder slurry to obtain purified naphthalene powder. Compared with an extraction method for purifying the naphthalene, the method has the advantages that the naphthalene does not need to be dissolved at a relatively high temperature during extraction, so that the dissolving and recrystallization processes are omitted; meanwhile, the temperature is generally 60-80 DEG C when the naphthalene is dissolved by the solvent, and then the temperature is reduced to room temperature for cooling crystallization. The naphthalene does not need to be dissolved, so that the solvent does not need to be heated, and the energy consumption caused by heating the solvent is reduced. Compared with a distributed crystallization method for purifying naphthalene, the method has the advantages that the frequency of distributed crystallization is remarkably reduced, and the energy consumption is reduced.

A method for preparing an olefin stream for oligomerization includes fractionating an olefin stream to provide a light gas stream and an olefin-enriched stream, which is selectively hydrogenated to convert diolefins to monoolefins to provide a monoolefin stream, and oligomerizing the monoolefin stream over an oligomerization catalyst to provide an oligomerized stream.

Disclosed is an extraction and purification method for biosynthetic squalene. The present invention pertains to the technical field of squalene extraction. In the present invention, the synergy between antioxidant addition, solvent pretreatment, and process condition control can reduce the peroxide value of the extracted finished product. The peroxide value can be as low as 1 meq / kg or lower, thereby meeting the pharmaceutical-grade peroxide value standard, and both the content and purity can reach 99% or higher. In addition, the use of a single organic solvent for extraction and chromatography avoids the difficult recovery problem with the cross-use of multiple solvents; the single organic solvent can be reused repeatedly. The total extraction yield is as high as 90%. The method is suitable for industrial continuous production.

The present invention relates to a monomer composition for synthesizing a recycled plastic, comprising a high-purity aromatic diol compound recycled through recycling using chemical decomposition of a polycarbonate-based resin; a method of preparing the monomer composition; and a recycled plastic and a molded article using the same. In addition, the present invention relates to a monomer composition for synthesizing a recycled plastic, comprising a high-value-added by-product recycled through recycling using chemical decomposition of a polycarbonate-based resin; a method of preparing the monomer composition; and a recycled plastic and a molded article using the same.