238results about "Extraction purification/separation" patented technology

The invention belongs to the technical field of bioengineering, and particularly relates to a preparation process of nanoscale water-soluble squalene. Comprising the following steps: S1, treating corn flour, adding pure water, and performing enzymolysis by adopting compound enzyme to obtain corn saccharified liquid for later use; s2, inoculating saccharomyces cerevisiae GS-A3 into a culture medium containing the corn saccharification liquid, and fermenting; s3, centrifuging the fermentation liquor, and extracting by adopting supercritical CO2 to obtain a squalene crude product; and S4, carrying out nanocrystallization treatment after molecular distillation treatment. According to the method, corn is taken as a raw material, rich starch resources are utilized, the corn is converted into glucose through enzymolysis, squalene is generated in saccharomyces cerevisiae through an MVA way, high-yield and high-purity squalene is prepared, the stability of squalene is improved through a special nanocrystallization treatment mode, the storage life of squalene in the application process is prolonged, and the method is suitable for industrial production. And the bioavailability can be obviously improved. In addition, the technology used in the invention meets the requirements of green and environmental protection.

The present disclosure relates to a process for removal of carbonyl impurities from a mixed hydrocarbon stream obtained from naphtha and gas stream cracking processes. The process of the present disclosure is simple, economical and environment friendly. The process of the present disclosure is efficient in removing higher amounts of carbonyl impurities. The process of the present disclosure can be easily scaled up for commercial purposes.

[Problem] To provide a method capable of producing a monocyclic aromatic hydrocarbon such as benzene or xylene effective as a base raw material, with a naphtha raw material containing renewable naphtha. [Solution] A method for producing at least one monocyclic aromatic hydrocarbon of benzene or xylene with a naphtha raw material containing renewable naphtha, the method including step (A-1) of pyrolyzing the naphtha raw material in the presence of water vapor, to produce and separate toluene, and step (A-2) of subjecting toluene to disproportionation reaction or transalkylation reaction, to produce and separate at least one monocyclic aromatic hydrocarbon of benzene or xylene.

The invention relates to a method for ultrasonic-enhanced extraction of a multicoloured leaf extract by using an ethanol and ethyl acetate cosolvent, and belongs to the technical field of chemical engineering and plant extraction. (2) synergistically degrading cellulose by using multi-component glycosidase; (3) cosolvent extraction; 4, chloroplast pigment is efficiently separated and purified, chlorophyll and other impurities in an extracting solution are effectively separated and removed through silica gel column chromatography, and therefore the high purity of the multicoloured leaf extract is achieved; according to the invention, ethanol and ethyl acetate are used as cosolvents to extract the multicoloured leaf extract, so that the extraction efficiency and the purity of the extract can be improved.

The invention belongs to the technical field of dielectric material monomer synthesis, and discloses a preparation method of 1-methylbenzocyclobutene, which comprises the following steps: reacting 1-hydroxybenzocyclobutene serving as a raw material with paratoluensulfonyl chloride (TsCl) to generate 1-paratoluensulfonyloxy benzocyclobutene, then reacting with methylmagnesium chloride under the action of a catalyst to obtain 1-paratoluensulfonyloxy benzocyclobutene; the target product 1-methylbenzocyclobutene is synthesized mainly by controlling the reaction temperature, the feeding sequence and the feeding proportion under the relatively mild condition, and the method is simple in technological operation, mild in experimental condition, high in product yield and suitable for industrial production.

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 the technical field of separation and purification, in particular to a method and a device for separating and purifying aromatic hydrocarbon, alkane and olefin, and the method combines liquid-liquid extraction and extractive distillation (namely, first extractive distillation and second extractive distillation), so that the liquid-liquid extraction and the extractive distillation are operated in respective dominant zones. In liquid-liquid extraction, heavy alkanes with small solubility are separated, light alkanes with high relative volatility are separated in first extractive distillation, olefins with high relative volatility are separated in second extractive distillation, aromatic hydrocarbons and solvents are separated in solvent recovery, and finally, the same solvent is used to realize efficient separation of aromatic hydrocarbons, alkanes and olefins.

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.

Disclosed is a process for producing a jet fuel, comprising a step of converting an alcohol stream in a fluidized bed, a jet fuel and a plant associated with said process. The process involves the following steps:(a) converting a C1 to C6 alcohol stream to produce a mixture containing paraffins, olefins, aromatics, and water;(b) separating water from the mixture;(c) oligomerizing olefins; and(d) alkylating aromatics from the mixture;(e) forming a stream of hydrocarbons to be hydrogenated;(f) hydrogenating the stream of hydrocarbons to be hydrogenated;(g) recovering at least one jet fuel fraction from the hydrogenated hydrocarbon stream.Conversion step (a) is carried out in a reaction zone comprising at least one fluidized catalytic bed.In the mixture of paraffins, olefins, aromatics and water produced in conversion step (a), the ratio of the mass of C3+ olefins to the total mass of olefins is greater than or equal to 0.8.

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.

A process for preparing a purified benzene composition from a crude hydrocarbon stream containing at least 10% by volume of benzene is provided. The process comprises subjecting the crude hydrocarbon stream and a further recycled benzene containing stream to a solvent-based extraction so as to produce a benzene enriched aromatic stream and a benzene depleted non-aromatic stream, subjecting the benzene enriched aromatic stream to a hydrodesulfurization so as to obtain a desulfurized aromatic stream, subjecting the desulfurized aromatic stream to a distillation producing a purified benzene stream and a further benzene containing stream having a benzene concentration of between less than 100% by weight and the azeotropic benzene concentration, and at least partially recycling the further benzene containing stream.

Processes and apparatuses for separating carbon monoxide from ethylene. The ethylene may be produced from biobased alcohol. The separation utilizes a fractionation column which produces a carbon monoxide depleted ethylene steam and an overhead steam comprising carbon monoxide and ethylene. The ethylene from the overhead steam may be recovered in an absorption zone with an absorbing liquid. A oxygenate fractionation zone may be utilized to remove oxygenates from the carbon monoxide depleted ethylene stream.

The present invention provides systems and methods for preventing the accumulation of light fractions such as methane, ethylene, and ethane in an olefin / paraffin separation system that uses a combination of a membrane and a distillation column for the separation. In one embodiment, a small stripper column is provided downstream of a selective hydrogenation reactor. In another embodiment, a pressure regulating vessel with a receiver is added to the retentate stream of the membrane unit.

The present invention relates to the technical field of polycyclic aromatic hydrocarbon separation, and provides a polycyclic aromatic hydrocarbon separation method. In the present invention, firstly, a mixed solvent and a mixture to be separated are mixed and then filtered to obtain a filter cake and a filtrate, then a back-extractant and the filtrate are mixed and then separated, wherein the mixed solvent is a naphthyl mixed solvent or an imidazole mixed solvent, and the mixture to be separated is a mixture containing a bicyclic aromatic hydrocarbon and a tricyclic aromatic hydrocarbon or a mixture containing a tricyclic aromatic hydrocarbon and a tetracyclic aromatic hydrocarbon. According to the present invention, the mixture containing the bicyclic aromatic hydrocarbon and the tricyclic aromatic hydrocarbon is separated by using the naphthyl mixed solvent, the mixture containing the tricyclic aromatic hydrocarbon and the tetracyclic aromatic hydrocarbon is separated by using the imidazole mixed solvent, and the naphthyl mixed solvent or the imidazole mixed solvent can be recycled. Additionally, the separation method provided by the present invention has simple steps, low energy consumption and a simple technological process.

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.

A column for the liquid-liquid extraction of a feedstock by an extraction solvent, containing sieve trays (Pi) for a dispersed phase (B) to pass through, the sieve trays being spaced apart by an inter-tray space (8), and riser / downcomer conduits (6), a riser / downcomer conduit being an opening that allows a continuous phase (A) to pass through a sieve tray, the extraction column (1) containing, in alternation, type-I sieve trays containing two peripheral riser / downcomer conduits, and type-II sieve trays containing a single central riser / downcomer conduit, wherein: the height H1 of the inter-tray spaces situated directly downstream of the type-I trays, in the direction of flow of the continuous phase, is greater than the height H2 of the inter-tray spaces positioned directly downstream of the type-II trays. Also, a liquid-liquid extraction method that makes use of the liquid-liquid extraction column.

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 utility model discloses equipment for recovering caprolactam in benzene residual liquid. The equipment comprises a crude benzene feeding assembly, the feeding end of the benzene distillation assembly is connected with the discharging end of the crude benzene feeding assembly, the benzene distillation assembly is used for distilling crude benzene, and the benzene distillation assembly comprises a first benzene distillation tower and a second benzene distillation tower; the benzene raffinate extraction assembly comprises a benzene raffinate extraction tower feeding cooler, the feeding end of the benzene raffinate extraction tower feeding cooler is connected with the discharging end of the benzene distillation tower II, and the benzene raffinate extraction tower feeding cooler is used for cooling benzene raffinate generated by the benzene distillation assembly; the feeding end of the benzene raffinate extraction tower is connected with the discharging end of the benzene raffinate extraction tower feeding cooler, and the benzene raffinate extraction tower is used for extracting the cooled benzene raffinate. The device is reasonable in design, the recovery rate of caprolactam in the benzene raffinate can reach 90% or above by additionally arranging the benzene raffinate extraction assembly, energy expenses such as steam and electricity are not generated, material consumption is reduced, and sewage treatment pressure can be reduced.

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.

The invention discloses a method for preparing pyridine hydrobromide using pyridine hydrochloride mother liquor, belongs to the technical field of pyridine hydrochloride, and is characterized in that it comprises the following steps: adding purified water to pyridine hydrochloride mother liquor, stirring and standing the mixed solution to be layered, and obtaining a lower layer solution; adding calcium hydroxide solution to the lower layer solution, adjusting the pH to neutral, and adding a phase transfer aid to saturation, stirring and standing the mixed solution to be layered, and obtaining an upper layer of recovered pyridine solution; passing hydrogen bromide gas into the recovered pyridine solution, and collecting the reaction solution; the reaction solution is decolorized, concentrated, cooled, crystallized and dried to obtain pyridine hydrobromide. The beneficial effects of the invention are: the mother liquor produced in the production process of pyridine hydrochloride, creatively introduces a phase transfer aid as calcium chloride, and the overall recovery rate of pyridine is increased from 50% to 90%.

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 utility model belongs to the technical field of chemical engineering, and relates to a device for removing dimethyl ether from C4 hydrocarbon. The dimethyl ether removal device comprises a dimethyl ether removal tower, a condenser, a reflux oil-water separation tank, a C4 feeding pipeline, an extraction water feeding pipeline and a dimethyl ether aqueous solution pipeline, an outlet of the C4 feeding pipeline is connected with the dimethyl ether removal tower, a top outlet of the dimethyl ether removal tower is connected with the condenser through a pipeline, the condenser is connected with the reflux oil-water separation tank through a pipeline, and the reflux oil-water separation tank is connected with the dimethyl ether aqueous solution pipeline through a pipeline. An oil phase outlet of the reflux oil-water separation tank is connected with the dimethyl ether removal tower through a pipeline, the extraction water feeding pipeline is connected with an inlet of the reflux oil-water separation tank, and a water phase outlet of the reflux oil-water separation tank is connected with a dimethyl ether water solution pipeline. According to the utility model, dimethyl ether in C4 hydrocarbon can be efficiently separated, namely more C4 hydrocarbon is refluxed under similar operation, and more dimethyl ether is discharged.

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 invention discloses a method for rapidly extracting industrial microorganism lycopene. Comprising the following steps: saponifying fermentation liquor, breaking bacteria, and extracting to obtain the lycopene. The method provided by the invention improves the efficiency of lycopene extraction, and overcomes the defects of low extraction rate, flammable and explosive properties and the like of the existing lycopene organic extractant. The method is favorable for improving the quality of the tomato pigment and is suitable for industrial production.

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).

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.