52 results about "Isooctanes" patented technology

The embodiment of the invention provides a preparation method of bis-ethylhexyloxyphenol methoxyphenyl triazine, and the preparation method comprises the following steps: taking 2, 4-dichloro-6-(4-methoxyphenyl) triazine and resorcinol mono-isooctane ether as raw materials, taking a synergistic activated resin as a catalyst, and reacting at the temperature of 80-90 DEG C to obtain the bis-ethylhexyloxyphenol methoxyphenyl triazine. The preparation method comprises the following steps: synthesizing bis-ethyl hexyloxyphenol methoxyphenyl triazine through a direct alkylation method; wherein the synergistic activated resin is acidic resin loaded with metal ions. According to the preparation method provided by the embodiment of the invention, at least the catalyst can be recycled and reused, a large amount of aluminum trichloride wastewater existing in a traditional synthesis method is avoided, and the preparation method is easily applied to actual industrial production.

The application provides a kind of eutectic solvent and its preparation method and application, the eutectic solvent includes hydrogen bond donor compound and hydrogen bond acceptor compound, the structural formula of hydrogen bond donor compound is wherein, R1 and R2 independently selected from n-octyl or iso-octyl, the hydrogen bond acceptor compound includes tri-n-octyl phosphine oxide.The eutectic solvent can be efficiently extracted from the permanent magnet rare earth waste hydrochloric acid solution of transition metal, can reduce the use of a large amount of organic solvent in the traditional extraction process.

The application discloses an alkylation device with a circulating refrigerant impurity removal function, which comprises an alkali washing assembly, a water washing assembly, a depropanizing tower and a deisobutane tower; the alkali washing assembly and the water washing assembly are connected in series on a circulating refrigerant feeding conveying pipe; a water washing assembly discharge port is in pipeline communication with a depropanizing tower feeding inlet; and a depropanizing tower lower discharge port is in pipeline communication with a deisobutane tower feeding inlet. The device can remove SO2, sulfides such as mercaptans and free water in the circulating refrigerant of the alkylation device, thereby effectively reducing the plugging frequency of the depropanizing tower, improving the propane removal efficiency of the alkylation device system, avoiding the increase of the content of propane in the system, maintaining a better alkylene ratio in the circulating material and improving the quality of the obtained isooctane product.

The flash evaporation kettle comprises a kettle body, a plurality of evenly-distributed supporting rods are connected to the position, close to the bottom, of the outer wall of the kettle body, a round block is connected to the position, close to the top, in the kettle body in a sliding mode, the bottom of the round block is movably connected with an upper pipe body, the top of the upper pipe body is arranged in a closed mode, and the bottom of the upper pipe body is connected with a flash evaporation device. The bottom of the upper pipe body is connected with a lower pipe body through a bolt, the bottom of the lower pipe body is closed, a feeding pipe is connected to the position, close to the top, of the left side of the kettle body in a penetrating mode, a feeding port is formed in the left side of the upper pipe body, and the bottom of the kettle body is communicated with a discharging pipe. According to the technical scheme, through mutual cooperation of the round block, the electric push rod, the rotating motor, the upper pipe body, the lower pipe body and other components, intermittent feeding can be conducted, effective and uniform flash evaporation can be conducted, the flash evaporation efficiency is improved, effective retention and swinging can be conducted, the full contact reaction can be conducted, and the service life of the device is prolonged. The contact reaction efficiency is improved.

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

The invention relates to the technical field of pharmaceutical analysis, in particular to a method for detecting vitamin D3 related substances in vitamin D drops, which comprises the following steps: (1) taking the vitamin D drops in a brown measuring flask, adding methanol for extraction, freezing to solidify oil drops, pouring methanol liquid, performing rotary evaporation under reduced pressure until the methanol liquid is dry, adding isooctane for dissolving to obtain a mass localization solution; (2) measuring and injecting into a purification chromatograph, accurately collecting the effluent in the time period according to the appearance time of the previtamin D3 and the impurity E in the impurity positioning solution, blow-drying with nitrogen, and adding isooctane for dissolving to obtain a test solution; (3) precisely measuring 100 [mu] l of the test solution, placing the test solution in a 10ml brown measuring flask, diluting with isooctane to a constant volume to a scale, and uniformly shaking to obtain a control solution; and (4) precisely measuring 100 [mu] l of the contrast solution and 100 [mu] l of the test solution, respectively injecting into an analysis liquid chromatograph, and recording chromatograms. According to the method, the interference of oily matrixes is removed, and various impurities in the vitamin D drops can be effectively, economically and quickly measured.

This invention relates to a method for determining the migration amounts of 4,4'-biphenyl and 1,1'-sulfonyl di(4-chlorobenzene), belonging to the technical field of migration amount determination. The method includes the following steps: S1: conducting a migration experiment; S2: treating the soaking solution; S3: preparing a chemical substitute solution; taking 2 mL of the chemical substitute reagent (95% ethanol or isooctane) soaking solution obtained after the migration experiment into a 10 mL stoppered graduated glass tube, accurately adding 50 μL of dimethyl sulfoxide, mixing, blowing with nitrogen to near dryness under a 45°C water bath, making up to 2 mL with acetonitrile-water solution (1+1), mixing, filtering through a microporous membrane, and preparing for determination; S4: preparing a blank solution; S5: sample determination; S6: blank determination; S7: verifying the recovery rate and precision of the method using the above blank sample, selecting the detection limit and quantitation limit for two-level experiments at two concentrations.

The invention discloses a synthesis method of bis-ethyl hexyloxyphenol methoxyphenyl triazine, which relates to the technical field of organic chemistry, and comprises the following steps: preparing an intermediate I, putting zinc chloride into reaction, adding xylene for dispersion, dropwise adding the intermediate I, resorcinol and xylene solvent to obtain a yellow intermediate II crude product, and then adding the yellow intermediate II crude product into the reaction kettle to obtain the bis-ethyl hexyloxyphenol methoxyphenyl triazine. Adding the intermediate II, a xylene solvent, an acid-binding agent, chloro-isooctane and bromo-isooctane into a reaction kettle, carrying out reaction treatment to obtain a high-purity product, and carrying out sampling detection on the step 1, the step 2 and the step 3. According to the synthesis method of the bis-ethyl hexyloxyphenol methoxyphenyl triazine, p-bromoanisole and chloro-isooctane or bromo-isooctane are adopted as raw materials, the production cost is reduced, xylene is a single solvent, the problem that a mixed solvent is difficult to recycle is solved, anhydrous aluminum chloride or anhydrous zinc chloride is adopted as a catalyst, and a recrystallization technology is adopted, so that the yield of the bis-ethyl hexyloxyphenol methoxyphenyl triazine is increased. The purity of the product is improved, and the bis-ethyl hexyloxyphenol methoxyphenyl triazine with higher purity is prepared.

The utility model relates to the technical field of isooctane production, and provides a sewage aeration treatment device for isooctane production, which comprises a sewage tank and a filter screen plate, one side of the outer surface of the top of the sewage tank is rotatably connected with a sealing cover, and four corners of the bottom of the filter screen plate are fixedly provided with support blocks. The filter screen plate is movably embedded in the sewage tank, and the two connecting plates are fixedly mounted on the two sides of the top of the filter screen plate; the sealing cover is closed, sewage is input into the sewage tank through the water inlet pipe, the sealed sewage tank can prevent isooctane from directly volatilizing and polluting air during aeration treatment, the air blower is started to convey the air into the connecting pipe through the air conveying pipe, and the connecting pipe is fixedly embedded in the lower end of the interior of the sewage tank. A plurality of aeration discs are arranged on the outer surface of the connecting pipe, air is converted into fine bubbles by the aeration discs, and isooctane in the sewage is volatilized in the aeration process to form gaseous pollutants.

Alcohol based unleaded automotive racing fuels, using blends of four basic chemical components, including ethanol, methanol, toluene, and isopentane and / or cyclopentane. Mixtures provide increased power, and better charge cooling than conventional racing gasolines, whether leaded or unleaded. The claimed racing fuel blends do not include gasoline, isooctane, or alkylate fractions common to alcohol-gasoline mixtures such as E85 alcohol based fuels. The novel fuel blends claimed can be manufactured from commonly available pure chemical components, and make possible distributed manufacture of automotive racing fuels.

The application belongs to the technical field of fine chemical product preparation, and particularly relates to a preparation method of diisooctyl phosphite intermediate and application of the intermediate in preparation of P507. The preparation method of the diisooctyl phosphite intermediate comprises the following steps: adding phosphorus trichloride into isooctanol by liquid dropping, controlling dropping speed, dropping pressure and reaction temperature, obtaining a diisooctyl phosphite mixture, removing impurities from the diisooctyl phosphite mixture by gas-phase ammonia neutralization or high-vacuum HCl removal, distilling chloroisoctane, collecting chloroisoctane byproduct, and finally obtaining diisooctyl phosphite. The preparation method of the diisooctyl phosphite intermediate is simple in operation, mild in condition, good in environmental protection, high in purity and yield of the prepared intermediate, and the application of the diisooctyl phosphite intermediate in preparation of P507 is high in purity of the prepared P507.

The invention provides a preparation method of polyurethane foam, which comprises the following steps: S10, preparing modified epoxy resin: polymerizing N-isopropylacrylamide and a cross-linking agent to form a temperature-sensitive network, and compounding the temperature-sensitive network with epoxy resin, polyvinyl alcohol and nano-zinc oxide; s20, preparing modified isooctane: forming a shell by using an acrylonitrile and methyl methacrylate copolymer through suspension polymerization, and wrapping the core substance dimethyl carbonate to obtain a core-shell structure microcapsule; and S30: mixing the two modifiers with additives such as polyol and a catalyst to form a component A, then impacting and mixing the component A with a polyisocyanate component B under high pressure, and injecting the mixture into a preheating mold for foaming and curing to finally obtain the polyurethane foam. The polyurethane foam prepared by the method is good in toughness, and is not easy to deform or break when being subjected to external tension or shear stress.

The application relates to an iminodiacetic acid type chelating resin and a preparation method and application thereof, and the preparation method comprises the following steps: (1) in the case that the stirring speed is 200-350 r / min, two dispersants are dissolved in water, then ethylbenzene, glycidyl methacrylate, trimethylolpropane trimethacrylate, isooctane and di-t-butyl peroxide are added, the raw materials are reacted after ultrasonic mixing, centrifugal separation is carried out after the reaction is completed, the filter cake is cleaned and dried, and resin microspheres are obtained; (2) in the stirring state, the resin microspheres obtained in the step (1) are added into water, then iminodiacetic acid is added, stirring is continued, then preliminary reaction is carried out by heating, NaOH is further added, reaction is carried out by heating, after the reaction is completed, filtration, cleaning and drying are carried out, and the iminodiacetic acid type chelating resin is obtained. The chelating resin particle size can be controlled, the particle size is relatively large, the specific surface area is large, the adsorption capacity is high, and the chelating resin can be used for adsorbing lead ions in heavy salt matrix.

The invention relates to a multi-effect synergistic pharmaceutical composition for bone repair and a preparation method thereof, and belongs to the technical field of biological medicine, the pharmaceutical composition comprises five-black chicken yolk peptide, tegillarca granosa peptide, epimedium extract and rhizoma drynariae extract. The five-black chicken egg yolk peptide is obtained by carrying out enzymolysis on five-black chicken egg yolk freeze-dried powder by lipase and trypsin, then carrying out enzymolysis by ficin and bromelain, and then sequentially purifying by a macroporous adsorption resin column and a phenyl agarose gel column. The tegillarca granosa peptide is obtained by fermenting tegillarca granosa meat through bacillus marinus; the herba epimedii extract is obtained by purifying an upper phase extracted from herba epimedii powder through an aqueous two-phase system through a sephadex chromatographic column; the rhizoma drynariae extract is obtained by performing enzymolysis on rhizoma drynariae powder with cellulase, extracting with a sodium dioctyl sulfosuccinate-isooctane reverse micelle solution, taking an upper organic phase, breaking micelles, taking a lower water phase and performing ultrafiltration. The four components are matched according to a specific proportion to realize multi-effect regulation of promoting formation, inhibiting bone resorption and regulating hormone.

The invention discloses an isooctane separation method and device, and the method comprises the steps: enabling a reaction product of isooctane to enter an isobutane tower for rectification separation, enabling tower bottoms of the isobutane tower to enter the tower top of a coarse separation tower, enabling tower top gas of the coarse separation tower to enter the tower bottom of the isobutane tower, enabling the tower top gas of the isobutane tower to be pressurized and heated, and then introducing the tower top gas into an isobutane tower reboiler, performing heat exchange with liquid extracted from a tower kettle of the isobutane tower, condensing tower top gas subjected to heat exchange into a liquid phase by gas condensation, cooling and depressurizing, introducing the liquid phase into a reflux tank of the isobutane tower, refluxing one part of the liquid phase obtained from the reflux tank of the isobutane tower to the tower top, and extracting the other part of the liquid phase as an isobutane product; a product at the bottom of the crude separation tower enters an isooctane tower for rectification separation, tower top gas of the isooctane tower is condensed and then enters an isooctane tower return tank, a part of condensate obtained from the isooctane tower return tank flows back to the tower top, the other part of condensate is extracted as an n-butane product, and isooctane is extracted from a tower kettle of the isooctane tower. According to the method, the production energy consumption of isooctane separation can be greatly reduced.

This invention relates to a method for the continuous production of isopropanol-isooctane azeotropic mixtures by extractive distillation, characterized in that the apparatus for implementing this method mainly comprises the following parts: distillation column 1 (T1), distillation column 2 (T2), condenser 1 (CL1), condenser 2 (CL2), top storage tank 1 (C1), top storage tank 2 (C2), reboiler 1 (H1), reboiler 2 (H2), cooler (COL), and centrifugal pump 1 (P1); wherein distillation column 1 (T1)... 1) The bottom stream enters distillation column 2 (T2), and high-purity isopropanol is collected from the top stream of distillation column 1 (T1). The bottom product of distillation column 1 (T1) enters distillation column 2 (T2), and high-purity isooctane is collected from the top stream of distillation column 2 (T2), completing the separation of components. High-purity extractant is obtained at the bottom of distillation column 2 (T2), and after passing through a cooler (COL), it enters a centrifugal pump (P1). After cooling, extractant is added and then refluxed to distillation column 1 (T1). The extractant used is essentially non-volatile, which reduces extractant loss and allows for reuse, thereby reducing separation costs.

The invention relates to the technical field of composite films, in particular to a preparation process of a ZIF-8 / Hb mixed LB film, which comprises the following steps: adding a hemoglobin solution into an aqueous solution of zinc nitrate hexahydrate, and stirring for reaction to obtain a first reaction solution; adding an aqueous solution of 2-methylimidazole into the first reaction solution, carrying out a stirring reaction, carrying out centrifugal washing, and drying to obtain ZIF-8 / Hb nanoparticles; adding the ZIF-8 / Hb nanoparticles into an isooctane solution of sodium dioctyl sulfosuccinate, and carrying out ultrasonic dispersion to obtain a second reaction solution; drawing a pi-A curve of ZIF-8 / Hb, and preparing a ZIF-8 / Hb film through a multifunctional LB film drawing machine and setting film drawing parameters; according to the invention, a reverse micelle synergistic stable interface is realized, a nano-particle film forming bottleneck is broken through, the biological activity is accurately reserved, an electrochemical sensing interface and technological parameters are intelligently regulated and controlled, and the effect of customizable film performance is realized.

The present application relates to a kind of multi-effect synergistic pharmaceutical composition for bone repair and preparation method thereof, belong to biological medicine technical field, and pharmaceutical composition includes five black chicken egg yolk peptide, mud clam peptide, epimedium extract and rhizoma drynariae extract.Five black chicken egg yolk peptide is five black chicken egg yolk freeze-dried powder by lipase and trypsin enzymolysis, then by ficin and bromelain enzymolysis, then sequentially by macroporous adsorption resin column and phenyl sepharose column purification is obtained.Mud clam peptide is mud clam meat by marine bacillus fermentation is obtained;Epimedium extract is epimedium powder by aqueous two-phase system extraction upper phase, by dextran gel chromatography column purification is obtained;Rhizoma drynariae extract is rhizoma drynariae powder by cellulase enzymolysis, by dioctyl sodium sulfosuccinate-isooctane reverse micelle solution extraction, take upper organic phase, after micelle breaking, take lower aqueous phase, ultrafiltration is obtained.Four are matched according to specific proportion, realize "promote formation-inhibit bone resorption-regulate hormone" multi-effect regulation.

An oil product mercaptan sulfur standard solution comprises n-dodecanethiol and isooctane, and the content of hydrogen sulfide in the n-dodecanethiol is lower than 3 [mu] g / g, more preferably lower than 1 [mu] g / g; the purity of isooctane is greater than 99.5 wt%, more preferably greater than 99.9 wt%, and the change amplitude of the concentration of mercaptan sulfur in the standard solution within 12 months is limited to 2%, more preferably less than 1%. The mercaptan sulfur standard solution in the oil product uses isooctane as a solvent, the molecular structure is closer to that of light fuel oil, but the singleness of the structure can be ensured, and the quality stability can be ensured; n-dodecanethiol is used as a source of mercaptan sulfur, so that high content and single source of mercaptan sulfur are ensured, and the change amplitude of the mercaptan sulfur concentration of the obtained standard solution within one year can be less than 2%.

The invention discloses a gas chromatography method for detecting the content of trioctyl phosphate products and impurities, and belongs to the technical field of organic chemical detection. The core of the method is that (trimethylsilyl) diazomethane (TMSCH2N2) is adopted as a derivatization reagent, and dioctyl phosphate (P204) in a sample is subjected to rapid and safe derivatization at room temperature; an optimized dichloromethane-hexane mixed solvent system is adopted for dilution, so that the solubility is remarkably improved, and the toxicity is reduced; a first-order heating rapid screening method (17min) is suitable for industrial quality control, a multi-order heating accurate quantification method (29min) is suitable for small-scale test process research and development, and trioctyl phosphate (TOP), P204, isooctyl alcohol, isooctyl ether and chloro-isooctane can be accurately quantified at the same time. The method solves the problems of high toxicity, low efficiency, narrow detection range, single mode and the like in the prior art, and has the remarkable advantages of safety, high efficiency, accuracy, environmental protection and wide adaptability.

The invention discloses a method for preparing isononanal through hydroformylation of isooctene, and belongs to the technical field of petrochemical engineering. The method comprises the following steps: feeding isooctene and synthesis gas from the outside into a raw material purification unit I, and removing sulfur, chlorine, oxygen and carbonyl metal to obtain purified isooctene and synthesis gas; under the catalytic action of a rhodium catalyst, the purified isooctene and synthesis gas enter a hydroformylation reaction unit II for reaction, and a reaction mixture containing isononanal is obtained; the reacted mixture enters a catalyst separation unit III to obtain a gas-phase mixture containing isononanal, the gas-phase mixture enters a product separation unit IV, and a liquid-phase mixture containing a catalyst returns to the hydroformylation reaction unit II; and a liquid-phase isononanal product and a byproduct containing isooctane and isooctene are obtained in a product separation unit IV and are respectively sent to the outside. The method solves the problems that the rhodium catalyst system has many heavy components, the catalyst and the product are difficult to separate, and the catalyst is easy to inactivate.

The utility model discloses a side extraction hopper for an isooctane reactor, which relates to the field of isooctane fractionating tower middle parts and comprises a fractionating tower middle part and a side extraction hopper arranged on the fractionating tower middle part, a limiting mechanism for limiting the middle part of the fractionating tower and the side extraction hopper is arranged on the side extraction hopper; the limiting mechanism comprises a limiting unit and a transmission unit. By arranging the limiting mechanism, when the side extraction bucket needs to be cleaned, the movable blocks and the push rod can be driven to move outwards by exerting outward pulling force on the pull rod, so that the guide rod on the push rod exerts extrusion pushing force on the guide groove in the limiting block, and meanwhile the other movable block is driven to move through the connecting rod; and the two limiting blocks which are symmetrical up and down are close to each other, so that the limitation of the middle part of the side extraction bucket fish fractionating tower is relieved, and a filter screen on the side extraction bucket is conveniently and quickly cleaned.

The invention discloses an alkylation superposition process of etherified C4, and belongs to the technical field of alkylation processes, the process takes etherified C4 as a raw material, and the etherified C4 is sequentially subjected to the steps of dehydration adsorption, propane separation, alkylation synthesis, flash separation, washing and refining, fractionation separation and waste acid treatment. According to the preparation method, sulfonate doped polypyrrole modified silica gel is taken as an adsorbent, pyrrole is subjected to in-situ polymerization on silica gel, alkyl chain-containing hydroxyl sodium sulfonate is added for doping modification, polar impurities can be efficiently captured, the purity of a C4 raw material is remarkably improved, purified C4 and isooctane are subjected to an alkylation reaction under the catalysis of sulfuric acid, and the purity of the C4 raw material is improved. The method has the advantages that reaction and separation are synergistically enhanced through flash evaporation, washing and rectification, the system stability and the reaction conversion rate are improved, the industrial isooctane superimposed oil is obtained, the raw materials and the catalyst are recycled, the overall energy efficiency is high, the product quality is excellent, and the method is suitable for industrial continuous production.

The present application relates to the technical field of petroleum refining, in particular to a iso-octane component and a preparation method thereof. The preparation method comprises the following steps: (1) feeding the material into a n-butane column in a STRATCO process, and fractionating in the n-butane column to obtain a component containing n-butane, a light component and a heavy component; (2) flash removing the component with a distillation point temperature not higher than 30 DEG C from the light component to obtain a component after flashing; (3) mixing the component after flashing with the heavy component obtained in step (1) at a weight ratio of 1:1-15; the content of the component with a distillation range of 15-80 DEG C in the light component is not less than 50%; and the content of the component with a distillation range of 80 DEG C-203 DEG C in the heavy component is not less than 90%. The present application can produce high-value iso-octane components with qualified quality, and the alkylation device load can be operated at 100%, which has very considerable economic benefits. The present application can adjust the product structure in real time according to market demand, has high flexibility and broad industrial popularization prospect, and has high economic and social benefits.

The invention discloses a method for detecting the purity of stearic acid in distearoyl phosphatidylcholine, and relates to the technical field of detection, and the method comprises the following steps: weighing 40mg of distearoyl phosphatidylcholine, placing in a round-bottom flask, adding a sodium hydroxide methanol solution, adding isooctane, uniformly mixing, standing, and taking the supernatant to obtain a test solution; adding a sodium hydroxide methanol solution into a round-bottom flask, adding isooctane, uniformly mixing, standing, and taking supernatant to obtain a blank solution; analyzing and detecting the test solution and the blank solution by adopting a gas chromatographic method to obtain a chromatogram, and calculating the stearic acid purity of the test solution according to the peak area of the chromatogram; according to the method for detecting the purity of stearic acid in distearoyl phosphatidylcholine, efficient and safe determination of the purity of stearic acid is realized by optimizing methyl esterification reaction conditions, adopting a sodium hydroxide methanol solution for methyl esterification, then adding isooctane, uniformly mixing and standing, and combining chromatographic conditions of gas chromatography.

The invention belongs to the technical field of pharmaceutical analysis, and particularly relates to a method for improving the stability of a vitamin D3 related substance impurity reference substance, which comprises the following steps of: optimizing solvent composition (selecting an isooctane-isopropanol mixed solution and adding 2, 6-butylated hydroxytoluene), subpackaging under the protection of nitrogen, and freezing and storing at the temperature of 20 DEG C below zero to obtain the vitamin D3 related substance impurity reference substance. The reference substance solution of the impurity C and the impurity E of the vitamin D3 can be stably stored at-20 DEG C for more than 12 months and cannot deteriorate after being transported at normal temperature for 3-7 days, the problem that reference substances in the prior art are prone to deteriorate due to the influence of high temperature, illumination and oxygen is solved, correction factors are kept stable for a long time, and the reliability of detection data is guaranteed.

The application discloses a kind of flower-shaped Mg-Al LDH modified polydimethylsiloxane / polyether sulfone composite film preparation and application thereof.Polyether sulfone is dissolved in N,N-dimethylacetamide, after blade film, film is immersed in deionized water.The PDMS is dissolved in isooctane solvent, then different concentrations of LDH are added to continue stirring until completely dispersed, and the crosslinking agent and catalyst are added according to the mass ratio of 10:2:1, and the wet film immersion coating method is used to prepare the coating.Modified composite film is obtained after coating.The application is mainly applied to the preparation of gas-liquid two-phase gas separation to obtain high CO2 / O2 selectivity, high gas permeation composite membrane material.The method is simple in preparation process, and the raw materials are cheap and easy to obtain, and the composite membrane modified by LDH can effectively improve the gas permeability and selectivity of the material, providing a new preparation idea for preparing good CO2 gas separation membrane.

The application discloses a solid polytitanium coagulant and a preparation method and application thereof based on liquid-phase dispersion, and the preparation method of the solid polytitanium coagulant comprises the following steps: firstly, mixing liquid organic dispersant and titanium tetrachloride to obtain a mixed solution, then adding a solvent into the mixed solution to perform a polymerization reaction, and finally performing suction filtration and drying on the obtained reaction solution to obtain the solid polytitanium coagulant; wherein the liquid organic dispersant is one or more of n-hexane, n-heptane, isooctane, 3-methylpentane and cyclopentane. By adding the organic dispersant and taking inorganic titanium salt-titanium tetrachloride as a titanium source precursor, the solid polytitanium coagulant with excellent coagulation performance is rapidly and stably prepared in a green, environmentally-friendly, economical and efficient manner, the prepared polytitanium coagulant has high polymerization degree and good storage performance, and can be widely applied to removal of turbidity, organic matters and heavy metals in drinking water, domestic sewage and industrial wastewater.

Provided is a bitterness unit measuring device which is able to efficiently and highly precisely measure the absorbance of isooctane containing an extracted bitter component without requiring collection of an exact sample quantity, and with which it is possible to directly and accurately calculate a bitterness unit from the absorbance, as established in official methods.　The present invention comprises: a sampling unit 5 which performs sampling of a specimen containing a bitter component; a slug flow-forming unit 6 which mixes the specimen, isooctane, and an acid aqueous solution at a predetermined volumetric ratio to form a liquid-liquid slug flow; an extracting unit 7 into which the liquid-liquid slug flow is introduced from the slug flow-forming unit 6 and which extracts the bitter component contained in the specimen into the isooctane; and an absorbance measuring unit 9 which measures the absorbance of the isooctane containing the bitter component.

The invention provides a fatty acid detection method, which comprises: A) extracting an oil sample to be detected by using a solvent to obtain a liquid to be detected; dissolving the fatty acid mixed standard substance with isooctane to obtain a mixed standard substance solution; b) determining the to-be-determined solution and the mixed standard substance solution by adopting a gas chromatographic method, and qualitatively and / or quantitatively determining the components of the to-be-determined solution by adopting a peak area percentage method according to the chromatogram of the reference substance solution; the gas chromatography conditions are as follows: a chromatographic column is a capillary chromatographic column taking phenyl (50%) methylpolysiloxane as a stationary phase. According to the present invention, the cyanopropyl aryl polysiloxane stationary phase chromatographic column is adopted to replace the SP-2560 polydicyanopropyl siloxane strong polarity stationary phase chromatographic column, and the temperature programming parameter and the split ratio are changed, such that the detection time is substantially shortened, the detection result is more accurate, and the timeliness and the accuracy of the detection result are improved.