55 results about "Fractionation" patented technology

According to the quantitative evaluation method for the dynamic output of the adsorbed gas and the free gas of the deep coal bed gas, the gas released by the coal bed rock core sample in the experiment process and the corresponding rock core experiment data are firstly obtained, and a basic data source fitting the actual reservoir characteristics of the deep coal bed is provided for subsequent evaluation. Then isotope value testing is conducted on the gas, a first methane carbon isotope value is obtained, and the fractionation characteristics of the methane gas in matrix holes and cracks are accurately reflected. First gas pressure and first core temperature of the coal bed gas in the matrix hole are calculated, second gas pressure and second core temperature of the coal bed gas in the fracture are obtained through calculation, and accurate characterization of the temperature and pressure field in the reservoir is achieved. Finally, the gas quantity of the adsorbed gas and the free gas of the coal bed gas is obtained through calculation by means of the gas state equation and the isothermal adsorption equation, and the accuracy of quantitative evaluation of the output of the adsorbed gas and the free gas of the coal bed gas is greatly improved through multi-source fitting of simulation experiment data and preset control equation calculation data.

The invention relates to the technical field of liquid chromatography fractionation, in particular to a full-automatic liquid chromatography fractionation device, which comprises a fractionation support, a chromatography column bracket and a fractionation chromatography column, and is also provided with an annular ultrasonic array module formed by combining a semi-ring diagnosis probe I and a semi-ring diagnosis probe II, an adjustable sieve plate, a multi-zone differential compensation assembly and a control module, a liquid inlet pipe, a liquid outlet and a detection sensor are additionally arranged; the annular ultrasonic array module detects the compactness of packing in the column and the axial and radial uniformity of pore distribution, the control module controls the multi-area differential compensation assembly to apply differential compensation pressure to different axial sections of a column bed after receiving data, and the detection sensor monitors fluid parameters; the device realizes accurate monitoring and targeted regulation and control of the column bed state, ensures uniform filler compactness, avoids flow state abnormity and bubble interference, remarkably improves fractionation separation efficiency and product purity, is convenient to operate and stable in operation, and is suitable for high-precision separation scenes.

A method can include receiving an oxygenate sample, fractioning the oxygenate sample into one or more fractions, and separating the fractions (e.g. using FAME fractionation, FAEE fractionation, crystallization, solvent extraction, or other similar methods). The fractions can optionally be separated independently. The method can optionally include esterifying carboxylic acids separated from the fractions with glycerol and deodorizing the glycerides.

The invention discloses a method for simulating phosphorus and chromium migration during farmland irrigation with acid mine wastewater, which comprises the following steps: mixing a plant-derived organic material with deionized water to obtain a soluble organic matter; h2O2 oxidizes Fe < 2 + > to prepare pure Schwertmannite, and the pure Schwertmannite is placed in a phosphate solution to obtain phosphorus-loaded Schwertmannite; mixing the phosphorus-loaded Schwertmannite and the soluble organic matter with a chromate solution, carrying out oscillation adsorption, carrying out solid-liquid separation after adsorption, carrying out CrO and POconcentration change test on filtrate, and carrying out mineral characterization on separated solids; a three-dimensional fluorescence spectrum is adopted to track composition conversion of the soluble organic matter in the reaction process; and analyzing the component change of the supernate before and after the reaction by adopting Fourier transform ion cyclotron resonance mass spectrometry. The influence mechanism of DOM on phosphorus and chromium fate in mineral / water interface molecular fractionation is disclosed from the molecular level, and a scientific basis is provided for collaborative migration risk assessment of phosphorus and heavy metal in acid mine wastewater irrigation area farmland.

This invention provides a method for detecting dichloronaphthalene, a persistent organic pollutant in soil sediments. The method includes: collecting soil sediment samples, pre-treating them by freeze-drying, grinding, and sieving to obtain a sample; extracting and purifying the sample using an organic solvent to prepare a test solution; analyzing and detecting the sample using ultra-high performance liquid chromatography-atmospheric pressure chemical ionization mass spectrometry (UPLC-APCI-MS / MS), and calculating the measured value of dichloronaphthalene in the test solution by substituting the obtained peak area and fractionation ratio into a specific formula. This invention fills the gap in my country's technology for detecting dichloronaphthalene-type persistent organic pollutants in soil sediments. This method can effectively eliminate interference from complex matrices, accurately determine trace amounts of six dichloronaphthalene isomers, and has the advantages of high sensitivity, strong anti-interference ability, simple operation, and high detection accuracy.

The invention relates to the field of organic compound synthesis, and more particularly to the production of valuable compounds for use in organic synthesis, and even more particularly to a method of producing O-methyl-N-phenyl carbamate of the formula shown. What is proposed is a method of producing O-methyl-N-phenyl carbamate of the given formula, which comprises reacting methanol with diphenylurea, wherein methanol is reacted with diphenylurea at a molar ratio of the reagents diphenylurea:methanol of 1:(6-15), and the process is carried out at a temperature of from 120 to 190°C to produce 99.9% pure O-methyl-N-phenyl carbamate, with subsequent separation of the products of the process by fractionation. The technical result of the proposed invention is an improved method of producing O-methyl-N-phenyl carbamate under optimal process conditions with a yield of 78-89% and separation of the products of the process by fractionation.

This document discloses a system and method for separating cracked hydrocarbon mixtures. A main fractionation column separates the cracked hydrocarbon mixture into top, side, and bottom fractions containing C1 to C6+ hydrocarbons. A top condenser and high-pressure separation system partially condenses the top fraction and compresses the uncondensed vapor to produce a compressed gas fraction and a compressed liquid fraction. A first distillation column receives the compressed liquid fraction and separates it into a first top vapor and a first bottom fraction. A second distillation column separates the first bottom fraction into a second top fraction and a second bottom fraction. An absorber receives a portion of the second bottom fraction and the side liquid fraction and contacts it in countercurrent flow with the compressed gas fraction, thereby producing an absorber top fraction and absorber bottom fraction containing exhaust gas. Such a system can be used to integrate existing FCC / RFCC units with petrochemical complexes.

The invention discloses a method for predicting an ammonium salt corrosion high-risk area of a catalytic cracking fractionation device. The method comprises the following steps: acquiring process structure parameters of a heavy oil catalytic cracking fractionation device to be detected and physical property data of reaction oil gas composition; establishing a process calculation model of the fractionation device according to the process characteristics and the physical property data of the reaction oil gas composition; solving material flow parameters in the fractionation device by using the model, and analyzing material flow characteristics such as vapor-liquid phase distribution, temperature distribution and corrosive medium component distribution in the device; calculating an ammonium salt crystallization temperature based on the material flow characteristics; and identifying and determining a high-risk area of ammonium salt crystallization corrosion in the fractionation device by combining the material flow characteristics and the ammonium salt crystallization temperature. The method can rapidly and accurately predict the ammonium salt crystallization corrosion high-risk area in the heavy oil catalytic cracking fractionation device, effectively reduces corrosion damage, optimizes anti-corrosion measures, improves the safe operation performance of the device, and is suitable for corrosion prediction and protection of petrochemical equipment.

The present disclosure provides methods and systems for producing a C4+ compound, including the steps of: (i) reacting a feed stream comprising C1+O1-3 hydrocarbons in the presence of an acid condensation (AC) catalyst at a condensation temperature and condensation pressure to produce an AC product stream including the C4+ compound; (ii) fractionating AC product stream into an AC liquid product stream including organic products and a vapor stream; (iii) fractionating the AC liquid product stream by a fractionation column into a liquid C4+ compound product stream and a gaseous overhead stream; (iv) cooling the gaseous overhead stream to produce a liquid reflux stream and a gaseous vent stream; (v) recycling a first portion of the liquid reflux stream to the fractionation column for the fractionation in step (iii); and (vi) recycling a second portion of the liquid reflux stream to the feed stream for the reaction in step (i).

The present application relates to the field of agricultural chemical analysis, and particularly relates to a method for grading extraction and fluorescent labeling quantitative detection of effective phosphorus forms in organic fertilizer, first, water-soluble phosphorus is extracted by oscillation with deionized water; then, the filter residue is treated with an ammonium citrate-EDTA complexing extraction liquid to obtain citric-soluble phosphorus; finally, the residue is dissolved with a mixed acid extraction liquid to obtain insoluble phosphorus, three kinds of extraction liquids are taken respectively, color developing reagent of ammonium molybdate, ascorbic acid reducing agent are added in turn to carry out color developing reaction, then a fluorescent enhancer is added to amplify the signal, the fluorescence intensity is measured, and the contents of water-soluble phosphorus, citric-soluble phosphorus and insoluble phosphorus are accurately calculated according to a standard curve, a water-ammonium citrate / EDTA-mixed acid three-stage gradient extraction system is adopted to realize efficient separation and extraction of water-soluble phosphorus, citric-soluble phosphorus and insoluble phosphorus in the organic fertilizer, especially, the synergistic complexing system of ammonium citrate and EDTA is introduced in the second-stage extraction, thereby improving the extraction efficiency of citric-soluble phosphorus.

The invention relates to organic synthesis techniques, and more particularly to a method of thermally decomposing 4,4'-methylene diphenyl dicarbamate (4,4'-MDC) to 4,4'-methylene diphenyl diisocyanate (4,4'-MDI), which is characterized in that 4,4'-MDC, in the form of a melt, or of a suspension in an inert carrier liquid, or of a powder, and an inert gas are fed into a column for conducting continuous thermal decomposition, the mixture is heated to 200-400°C inside the column for the gas-phase decomposition of 4,4'-MDC in the stream of inert gas at atmospheric pressure, then the mixture is separated in a fractionation column to isolate high-purity 4,4'-MDI. The technical result of the proposed invention is an improved method resulting in a high yield of high-purity 4,4'-MDI.

The invention provides an iron-sulfur isotope equilibrium fractionation factor calculation method based on a density functional theory. The iron-sulfur isotope equilibrium fractionation factor calculation method comprises the following steps: firstly, constructing initial mineral models of amorphous FeS, cubic FeS, maquinol ore, hematite, hematite and pyrite; the model is optimized through a spin polarization DFT + U method, GGA-PBE functional, OTFG ultra-soft pseudo potential, 400 eV plane wave cutoff energy and 5.0 * 10 <-7 > Hartree self-consistent field convergence standards are selected as calculation parameters, and the optimal Hubbar Ueff value and magnetic sequence arrangement of each mineral are determined; and finally, calculating the simple harmonic vibration frequency of the mineral, and deducing equilibrium fractionation factors (1000ln beta value) of Fe and S isotopes at a specific temperature. According to the method, the theoretical blank of isotope fractionation of the conversion path from amorphous FeS to pyrite is filled up, the data can be used for judging the isotope balance of minerals and tracing the mineralization process, and an important theoretical basis is provided for research on sedimentary diagenesis and ancient ocean redox.

The present application belongs to the technical field of chemical petroleum fractionation, and particularly relates to a gas-liquid separation equipment for chemical petroleum refining, which comprises a shell, a support, a fractionation mechanism and a controller. The shell is designed in a cylindrical shape in the middle part and in a semicircular shape at both ends. The shell is hollow. The support is located close to the bottom of the shell and is fixed to the shell. The fractionation mechanism is installed in the shell. In the present application, a small amount of petroleum vapor continues to rise in the fractionation tower due to insufficient condensation during the rising process of the vapor, so that the condensed petroleum vapor at another height is obtained, thereby effectively improving the production rate of the oil product.

The present technology generally relates to a process for the development of mushroom mycelium using byproducts of protein isolate production and fractionation or milling.

The application relates to the field of environmental science and technology, and discloses a fine-source analysis method for atmospheric pollutants combining computational chemistry and isotopes, which comprises the following steps: constructing an isotopic data set, simulating a target pollutant molecular configuration, constructing an isotopic fractionation paradigm equation, correcting local isotopic fractionation, tracing the generation mechanism of a target pollutant in a typical region, and optimizing source analysis of the target pollutant in the typical region. In this way, based on computational chemistry, the density functional theory and the U-B-GM model are coupled, the isotopic fractionation paradigm equation is constructed for a preset reaction path, the specific isotopic fractionation value or fractionation coefficient is accurately simulated in combination with atmospheric environmental parameters during observation, and a local isotopic fractionation correction scheme is established accordingly; the correction scheme is oriented towards fine-source analysis, and can accurately identify the generation mechanism and pollution sources. In this way, the uncertainty of source analysis can be effectively reduced, and fine tracing of the sources of atmospheric pollutants can be realized.

The present invention is directed to fractionation of crude tall oil, which originates from the Kraft process black liquor. In the method according to the present invention, at least two strongly basic anion exchange resins are used to efficiently separate fractions from the crude tall oil.

The utility model relates to the technical field of waste liquid treatment, and discloses a laboratory waste liquid graded extraction device which comprises a treatment tank, a pretreatment pipe is slidably inserted into the upper surface of the treatment tank, and the top end of the pretreatment pipe is funnel-shaped. According to the graded extraction device for the laboratory waste liquid, through the metering pump, the first liquid level sensor and the second liquid level sensor, the liquid level of a medicament in the medicament tank and the liquid level of the waste liquid in the treatment tank can be monitored in real time, so that the addition amount of the medicament is automatically adjusted according to the volume of the waste liquid, and accurate proportioning is realized; by means of the function, errors caused by manual visual adding are avoided, the treatment efficiency and the waste liquid treatment accuracy are improved, a filter screen, a first filter element and a second filter element in the pretreatment pipe form a multi-stage filtering system, waste liquid can be filtered stage by stage, impurities and pollutants with different particle sizes are effectively removed, and the treatment effect is good. The graded extraction mode not only improves the purification efficiency, but also ensures the stability of the final treatment result.

The invention relates to the technical field of industrial chemistry and resource recovery, and discloses a method for efficiently extracting acetophenone and other organic chemical materials from heavy aromatics, the method comprises the steps of raw material pretreatment, catalytic cracking reaction, rectification separation and condensation recovery, and the raw material pretreatment comprises the steps of mechanical filtration, dehydration treatment and preliminary fractionation; solid impurities and moisture in the heavy aromatic hydrocarbon raw material are removed, light components are separated out, pure raw materials are provided for subsequent catalytic cracking reaction, catalyst poisoning and reaction interference are avoided, and the stability and efficiency of the whole extraction process are guaranteed; a composite catalyst is adopted for catalytic cracking reaction, macromolecules in heavy aromatics are efficiently cracked to generate acetophenone, methyl styrene and other organic chemical materials under optimized pressure and temperature conditions, the catalyst has high activity and selectivity, and the yield and reaction rate of a target product are improved.

To provide a method for detecting lipid nanoparticles.SOLUTION: The present disclosure provides a method for detecting size, density, or both size and density of lipid nanoparticles. The detection can be performed using centrifugal field flow fractionation with a carrier solution containing monosaccharides.SELECTED DRAWING: Figure 1

Processes for producing two CO2 streams having different purities, including one stream comprising ultra high purity CO2. The processes incorporate a second fractionation column in a CO2 fractionation process. The bottoms stream from the first cryogenic fractionation column is sent to the second CO2 fractionation column. The second CO2 fractionation column can produce ultra high purity CO2. The bottoms stream from the first column can be divided and a portion of the bottoms stream can be recovered as a second CO2 product stream having a lower purity than the purity of the product stream.

The invention discloses a phenol separation coupling catalysis purification method, and relates to the technical field of fine chemical separation and purification. According to the method, a metal oxide modified H-ZSM-5 molecular sieve is used as a catalyst, a coupling reaction and a separation process are carried out in a catalytic rectifying tower, and two core processes are synchronously completed: 1, impurities such as phenol and o-cresol in raw materials are subjected to a targeted O-alkylation reaction with methanol, and the impurities difficult to separate are efficiently converted into an alkylate easy to rectify; and 2, precise fractionation is synchronously realized, heavy ether products are extracted and removed from a side line, and target products mainly comprising high-purity 2, 6-xylenol and 2, 4-xylenol are obtained in a tower kettle. Through integrated design of targeted conversion and synchronous separation, key impurities are removed with high selectivity, the process is simplified, equipment investment and energy consumption are reduced, non-target side reactions are avoided, and high selectivity, high yield, process economy and product quality of target xylenol are considered.

The present invention relates generally to a method for characterizing charge variants of a protein of interest. In particular, the present invention relates to the use of desalting size-exclusion chromatography-reduced peptide mapping mass spectrometry to identify charge variants separated by capillary isoelectric focusing.

The present invention relates to a method for purifying an aqueous waste stream providing a purified aqueous solution, the method comprises the steps of (i) contacting the aqueous waste stream with a first metal-capturing resin; (ii) allowing one or more metals to bind to the first metal-capturing resin, providing a captured fraction and an un-captured fraction; (iii) separating the un-captured fraction from the resin comprising the captured fraction; (iv) subjecting the resin comprising the captured fraction to a first elution buffer separating at least one metal solution comprising one or more metals from the captured fraction; (v) subjecting the un-captured fraction to a fractionation step removing one or more organic compounds, one or more PFAS compound, one or more metalloid, or a combination hereof from the un-captured fraction providing the purified aqueous solution.

The invention relates to the technical field of light hydrocarbon fractionation, and particularly discloses a temperature control method of a deethanization column and a light hydrocarbon fractionation system.The temperature control method comprises the steps that an initial fluid is separated through a first low-temperature separator, and a first gaseous fluid and a first liquid fluid are obtained; after expanding and cooling the first gaseous fluid, separating to obtain a second liquid fluid; the second liquid-state fluid enters a second low-temperature separator, and third liquid-state fluid is obtained after separation; dividing the first liquid-state fluid to obtain a first liquid-state divided flow and a second liquid-state divided flow; the first liquid split flow and the third liquid fluid are converged and then reheated, and fourth liquid fluid is obtained through separation; inputting the fourth liquid-state fluid into the middle position of a deethanization column for fractionation; and inputting the second liquid split flow into the top end of the deethanizer for cooling the top end of the deethanizer.

Provided is a fractionation method capable of inhibiting the mixing of water into a target component to be fractionated. A method for fractionating a target component from a sample includes a separation step of separating the target component, a trapping step of trapping the separated target component in a trapping column, an elution step of causing the target component to flow out of the trapping column, and a recovery step of recovering the target component that has flowed out of the trapping column. In the elution step, water and the target component that have flowed out of the trapping column are separated by adjusting the flow rate of an elution organic solvent into the trapping column.

The invention discloses a production method of bio-based methyl acetate, and relates to the technical field of biomass energy and chemical industry. The method provided by the invention comprises the following steps: pre-treated non-grain biomass raw materials are added into a thermal fractionation unit, after thermal fractionation deoxidation and volatile components are carried out, charcoal and biological combustible gas are obtained, and the biological combustible gas is used for a production process; adding the biochar into a gasification unit, and carrying out gasification reaction to obtain crude synthesis gas; adding the crude synthesis gas into a separation unit, and separating out a first part of carbon monoxide and a second part of carbon monoxide to obtain synthesis gas; adding the synthesis gas into a synthesis unit, and refining after synthesis reaction to obtain methanol; adding the methanol into a dehydration unit, and carrying out dehydration reaction to obtain dimethyl ether; and adding the first part of carbon monoxide and dimethyl ether into a carbonyl insertion unit, and refining after carbonyl insertion reaction to obtain methyl acetate. The method provided by the invention has remarkable economic benefits and environmental protection benefits.

A process for the fractionation of recovered carbon black particles, the process comprising (i) providing a stream S0 of recovered carbon black particles, wherein said particles comprise a carbon component at an average content cC(S0) and an inorganic non-carbon component at an average content cN(S0) and wherein said particles exhibit a particle size distribution characterized by a DV90(S0) value in the range of from 5 to 200 μm; (ii) passing the stream S0 through a first centrifugal force classifier C1, obtaining a fine fraction stream SF1 and a coarse fraction stream SC1; (iii) passing the stream SF1 through a second centrifugal force classifier C2, obtaining from C2 a fine fraction stream SF2 and a coarse fraction stream SC2; (iv) passing the stream SF2 through a filter separator C3, obtaining from C3 a coarse fraction stream SC3 of particles exhibiting a particle size distribution characterized by a DV90(SC3) value, wherein the particles of the stream SC3 comprise the carbon component at an average content cC(SC3) and the inorganic non-carbon component at an average content cN(SC3) with cN(SC3) < cN(S0) and cC(SC3) > cC(S0).

The invention belongs to the field of alpinia oxyphylla essential oil fractionation and chemical components, and particularly relates to an alpinia oxyphylla essential oil fractionation refining method and application thereof. The fructus alpiniae oxyphyllae essential oil is divided into seven fractions through 6 fractionation, and in a light phase 6 and a heavy phase 6, the main active ingredient nootkatone (nootkatone) of fructus alpiniae oxyphyllae is enriched. The chemical components of the fractions are further analyzed, and the result shows that the chemical components, tastes, colors and the like of the seven fractions obtained through fractionation are obviously different, and the biological activities of compounds contained in the fractions are different. The method for fractionating and refining the alpinia oxyphylla essential oil can finely fractionate the alpinia oxyphylla essential oil, lays a foundation for research on pharmacological activity and development and utilization of the alpinia oxyphylla essential oil, provides a method for analyzing chemical components of seven fractions, and provides a foundation for comprehensive development and utilization of the alpinia oxyphylla essential oil.

The application discloses a reaction process for preparing succinic anhydride, and comprises the following contents: (1) mixing uniformly a maleic anhydride solution and hydrogen to obtain mixed feed I, feeding the mixed feed I into an up-flow fixed bed reactor A, and performing a first hydrogenation reaction to obtain a first hydrogenation reaction product; (2) after heat removal, mixing uniformly the first hydrogenation reaction product with supplemental hydrogen to obtain mixed feed II, feeding the mixed feed II into an up-flow fixed bed reactor B, and performing a second hydrogenation reaction to obtain a second hydrogenation reaction product; and (3) after heat removal, performing gas-liquid separation on the second hydrogenation reaction product, recycling a part of a liquid phase, and feeding the other part of the liquid phase into a subsequent product fractionation unit. By adjusting the hydrogen feeding ratio of the reactor A / B and the micro-bubble content, the maleic anhydride hydrogenation reaction conversion rate and selectivity can be kept high during the preparation of succinic anhydride, and all catalysts in the reaction system can be simultaneously deactivated, so that the total operation period of the device is greatly prolonged, and the economy of the industrial device is improved.

One aim of the present invention is to enable the size of the fractionation column located downstream of the hydrocracking section to be minimised and therefore to minimise the cost of the process without having an impact on the performance of the process in terms of yield and selectivity for kerosene produced, by virtue of implementing a step of separation at the outlet of the hydrotreatment step a) and at the outlet of the hydrocracking step c), in the same separation unit or in different units, enabling at least part, and preferably all, of the liquid hydrocarbon effluent resulting from said separation to be fed directly to the hydrocracking step c) without passing through the fractionation step.