2051 results about "Benzene" patented technology

The invention provides a preparation method of a hyperbranched polyimide-derived silicon-carbon negative electrode material, which comprises the following steps: S1, preparation of a carbon precursor: mixing 1, 3, 5-tris (4-aminophenyl) benzene and 4, 4 '-(hexafluoroisopropenyl) diphthalic anhydride for reaction to prepare hyperbranched polyimide; s2, preparing porous carbon; and S3, vapor phase silicon carbon deposition. The invention also correspondingly provides a silicon-carbon negative electrode, a lithium ion battery and an electrochemical device. According to the hyperbranched polyimide-derived silicon-carbon negative electrode material, the volume expansion of silicon in the lithium intercalation process is effectively relieved, the active material is prevented from falling off, and the cycling stability of the battery is improved.

The invention provides a preparation method of a chain extender containing an imine bond and application of the chain extender in thermosetting polyurethane, and the preparation method comprises the following steps: under anhydrous and anaerobic conditions, mixing a reagent A and a reagent B, adding a solvent, reacting at 25-40 DEG C for 4-6 hours, cooling to room temperature, and carrying out rotary evaporation to remove the solvent to obtain the chain extender, wherein the reagent A is a derivative of benzene, one substituent group is an aldehyde group, at least one of the other five substituent groups is a hydroxyl group or an aldehyde group, and the reagent B is an organic compound containing both amido and hydroxyl group or an organic compound containing both amido and hydroxyl group. When the chain extender is used for preparing thermosetting polyurethane, imine bonds and carbamate bonds can be introduced into one monomer at the same time, so that the thermosetting polyurethane can maintain original excellent mechanical properties, solvent resistance and thermal stability, and also has self-healing and recyclable capabilities; the compatibility is good, and the performance and the application range of the thermosetting polyurethane are widened.

The invention relates to the technical field of water treatment, in particular to a reverse osmosis membrane and a preparation method thereof. The preparation method of the reverse osmosis membrane comprises the following steps: soaking a base membrane in a water phase solution, taking out the base membrane, drying the surface of the base membrane, coating the base membrane with an oil phase solution, carrying out interfacial polymerization reaction, curing, coating with a modifier solution, and drying to obtain the reverse osmosis membrane, the modifying agent comprises 2, 4, 6-tri (4-aminophenyl)-1, 3, 5-triazine-1, 3, 5-tri (4-methyl phenyl) benzene. The successfully grafted COFs can improve the water permeability of the membrane to a certain extent, and also can improve the pollution resistance, acid resistance and oxidation resistance of the membrane, so that the service life of the membrane is prolonged. According to the invention, different effects of the same type of imino COFs introduced to the reverse osmosis membrane are further compared, so that the excellence of the selected imino COFs is highlighted.

The present invention relates to the field of water treatment technology, and more particularly to a kind of reverse osmosis membrane and preparation method thereof.The preparation method of the reverse osmosis membrane includes:Basement membrane is soaked in aqueous phase solution, after taking out surface drying, oil phase solution is coated on basement membrane and carries out interfacial polymerization reaction, after solidification, coating modifier solution, after drying, obtain reverse osmosis membrane;The modifier includes 2,4,6-tris (4-aminophenyl) ‑1,3,5-triazine ‑1,3,5-tris (4-methylphenyl) benzene.The COFs successfully grafted by the present invention can improve the water permeability of membrane to a certain extent, and can also improve the anti-pollution property, acid resistance and oxidation resistance of membrane, and then improve the service life of membrane.The present invention further compares the different effects that the same type of imino COFs are introduced into reverse osmosis membrane, so as to highlight the excellence of the imino COFs selected by the present invention.

The invention discloses a crown ether grafted polyarylether sulfone ion separation membrane as well as a preparation method and application thereof, and belongs to the technical field of ion separation membranes, collaborative optimization is realized through crown ether accurate grafting and ultrathin ordered membrane formation: a main chain of polyarylether sulfone is grafted with 4 '-aminobenzo-12-crown-4 to form an inherent channel adapted to Li, and the specific surface area of the main chain is increased; the ultrathin film is prepared by a water surface spreading method, and the ion transmission path is shortened. Finally, in a LiCl / MgCl system, Liion flux has high selectivity, high permeation-high selectivity cooperation is preliminarily realized, the chemical synthesis step can be amplified to a kilogram level, and after a DPAES-g-CE / dichloromethane solution is dropwise added to the water surface, the DPAES-g-CE / dichloromethane solution is rapidly spread to form a film without precise equipment; the raw materials are industrial-grade monomers and have no toxic residues, the membrane can be recycled and reused through dichloromethane, the equipment cost is reduced by about 90%, and industrialization is easy; the main chain of the polyaryl ether sulfone is high in rigidity and resistant to high temperature and chemical corrosion; crown ether grafting avoids molecular chain agglomeration, and the swelling rate is far lower than that of a traditional sulfonated membrane.

The invention relates to the technical field of preparation of organic photoelectric materials, in particular to an organic light-emitting device and a display or lighting device comprising the organic light-emitting device. A hole transport layer compound of the device is obtained by taking a phenyl and alkyl fixed substituted fluorenyl structure as a core fragment and taking a benzo five-membered ring and a limited substituted benzene ring as two side chains of amido, and is matched with a limiting material of a light-emitting auxiliary layer to manufacture an OLED (Organic Light Emitting Diode) element; the light-emitting efficiency and the working life of the organic light-emitting device are effectively improved, and the application prospect is very good.

The invention discloses pre-activated-carbonized lignin-based hard carbon as well as a preparation method and application thereof. According to the method, alkali lignin is used as a carbon source, o-benzene nitrogen-containing metal salt is used as an activating agent, and the lignin-based hard carbon with large interlayer spacing and rich closed pores is prepared through pre-activation-carbonization. The preparation method comprises the following steps: firstly, carrying out oxidation modification on alkali lignin, mixing with o-benzene nitrogen-containing metal salt, and carbonizing to obtain pre-activated carbon; and washing and drying the pre-activated carbon, and performing secondary high-temperature carbonization to obtain the lignin-based hard carbon material. According to the lignin-based hard carbon material prepared through the method, the interlayer spacing is 0.385-0.397 nm, the closed pore volume is 0.54-0.73 cm < 3 > / g, the first-circle charging specific capacity is 361 mAh / g, the platform capacity is 242 mAh / g, sodium ion transmission is promoted, sufficient sites are provided for sodium cluster filling, and the lignin-based hard carbon material serves as a sodium ion battery negative electrode material and has high platform capacity and good rate capability.

The invention discloses a nitrogen-doped oxygen-vacancy-rich three-dimensional flower-shaped bismuth oxide electrocatalyst as well as a preparation method and application thereof, relates to the technical field of electrocatalysts, and solves the problems that a traditional bismuth oxide catalyst is insufficient in electron transfer capability and low in active site utilization rate. The preparation method comprises the following steps: dissolving bismuth nitrate, polyvinylpyrrolidone and sodium oleate in a mixed solvent of methanol and N, N-dimethylformamide, and stirring and dissolving to obtain a solution A; the preparation method comprises the following steps: dissolving 1, 3, 5-tri (4-carboxyl phenyl) benzene in a mixed solvent of methanol and N, N-dimethylformamide, and stirring and dissolving to obtain a solution B; and adding the B into the A, uniformly stirring, heating in an oil bath, reacting under magnetic stirring, cooling to room temperature, filtering, washing and drying the product to obtain white powder, calcining in a tubular furnace to obtain three-dimensional flower-shaped Bi2O3, putting in the tubular furnace, introducing argon, introducing ammonia gas, heating, and carrying out heat preservation reaction to obtain the electrocatalyst. The catalyst can be used for catalyzing nitrogen reduction synthesis ammonia reaction.

The invention discloses a mechanical force-induced fluorescence discoloration sensor material as well as a preparation method and application thereof, and relates to the technical field of organic synthesis and fine chemical engineering. The preparation method comprises the following steps: step 1, carrying out heating reaction on 4-(1, 2, 2-triphenyl vinyl) benzaldehyde, 3-(2, 2-dicyano-1-(3, 4-diaminophenyl) vinyl) benzene-1-yl and a catalyst to prepare a compound 1-1; and 2, carrying out heating reaction on the obtained compound 1-1 and methyl iodide under the action of alkali and a solvent, and analyzing and purifying to obtain a compound 1-2. The compound disclosed by the invention is low in preparation cost, simple and convenient to operate and simple in method, the compound shows the material characteristic of mechanical force-induced fluorescence discoloration and can be applied to the fields of sensors, dyes, anti-counterfeiting and the like, and meanwhile, the synthesis method can be used for synthesis in the fields of fine organic chemical engineering such as luminescent materials, printing and dyeing technologies and the like.

The invention relates to a cellulose-chitosan-based lithium ion battery diaphragm and a preparation method and application thereof.The preparation method of the diaphragm comprises the steps that gamma-polyglutamic acid and polyamide epichlorohydrin are adopted for modifying chitosan, the hydrophilicity and the liquid absorption capacity of the chitosan are improved, polyvinylpyrrolidone is adopted for coating the chitosan, and the hydrophilicity and the liquid absorption capacity of the chitosan are improved; pVP is replaced in ethanol soaking to form micropores, so that the porosity of the modified chitosan is improved. Amino groups and hydroxyl groups of the modified chitosan are combined with catechol of the polydopamine and hydroxyl groups of the hydroxy propyl cellulose through hydrogen bonds and covalent bonds to form a chitosan-cellulose-PDA interpenetrating network, and the diaphragm material suitable for the lithium ion battery is finally prepared by combining hot-pressing shaping. The preparation method has the advantages that the balance between the mechanical property and the ion conduction property of the diaphragm is realized through multi-component compounding by utilizing the biocompatibility and renewability of natural macromolecules (cellulose and chitosan).

The invention discloses a memristor based on a covalent organic framework and a preparation method and application thereof.The memristor comprises a substrate, a semiconductor electrode, a covalent organic framework film and a metal electrode which are sequentially arranged in a stacked mode, and the covalent organic framework film is composed of 1, 3, 4, 5, 6, 7, 8, 8, 9, 10, 11, 12, 13, 14, 16, 17, 17, 17, 17, 17, 17, 17, 17, the catalyst is prepared by condensing 1, 3, 5-tri (4-aminophenyl) benzene and terephthalaldehyde or terephthalaldehyde with an alkyl or alkoxy side chain. The covalent organic framework film has a highly ordered structure and an adjustable porous structure, the preparation process is simple, the film thickness is uniform, the flatness and the crystallinity are high, and the dielectric property is adjusted, so that the switching voltage and the cycling stability of the memristor are adjusted, and the memristor has stable and repeatable switching performance; the COFs-based memristor has high on / off ratio, low device variability and high flexibility, can be used for preparing the COFs-based memristor, can provide technical support for neuromorphic devices with high efficiency, adjustability, structure adjustability and rich functions, and can be applied to the field of intelligent sensing and autonomous system control such as an auxiliary driving system.

The invention belongs to the technical field of semipermeable membrane preparation, and particularly relates to a preparation method of a reverse osmosis membrane. The preparation method comprises the following steps: (1) cleaning the supporting layer for later use; blending diamine, a performance additive and water to obtain a water phase for later use; the preparation method comprises the following steps: blending aromatic acyl chloride, a cosolvent and an organic solvent to obtain an oil phase A for later use, and blending a dynamic crosslinking monomer and the organic solvent to obtain an oil phase B for later use; (2) placing a supporting layer at the bottom of a container, uniformly mixing a water phase and a catalyst, and adding the mixture into the container; and adding the oil phase A into a container to carry out primary condensation reaction, adding the oil phase B to carry out secondary condensation reaction after the reaction is finished, and carrying out post-treatment to obtain the reverse osmosis membrane. According to the invention, a Schiff base-benzene ring bridging structure and a dynamic crosslinking imine bond are introduced through a dynamic crosslinking monomer; and dodecyl ethyoxyl sulphobetaine is matched, so that the chlorine resistance and pollution resistance of the reverse osmosis membrane are improved, and meanwhile, the reverse osmosis membrane has good salt rejection rate and water flux.

Provided is an aromatic polyether in which the radical concentration measured using TEMPOL as a standard substance and benzene as a solvent for the standard substance is 6.5×1015 spin / g or more at 25 °C, and the diameter of spherulites is 0.001-30 μm.

The invention relates to the technical field of biological medicines, and particularly discloses a BODIPY (boron dipyrromethene)-based compound and an application of the BODIPY-based compound in photodynamic oxidation of beta-amyloid protein (Abeta). The compound takes iodo-BODIPY as a photosensitive core and is connected with 4-t-butyloxycarboryl benzene as an A beta recognition group. The introduction of iodine atoms significantly enhances the intersystem crossing ability of molecules, so that the molecules have excellent reactive oxygen species (ROS) generation ability. The compound has high ROS yield, good optical stability and biocompatibility, can specifically target A beta aggregate, realizes photodynamic oxidative degradation, and provides a novel potential tool for treatment of Alzheimer's disease.

The invention relates to a preparation method of a ZIF-67 derived cobalt-manganese catalyst and application of the ZIF-67 derived cobalt-manganese catalyst in catalytic oxidation of benzene, and belongs to the technical field of catalyst preparation. The preparation method comprises the following steps: preparing a ZIF-67 precursor; dispersing ZIF-67 in water to form a turbid liquid, and adding a potassium permanganate aqueous solution to carry out an etching reaction to obtain a mixed system; transferring the mixed system into a reaction kettle for hydrothermal reaction to obtain a black precipitate; and washing the black precipitate, drying, roasting, and grinding to obtain the ZIF-67 derived cobalt-manganese catalyst. According to the preparation method, the problem that residues are usually easy to remain in the conventional preparation method of the ZIF-67 catalyst is solved, and the Co-Mn8-T140 catalyst prepared by the preparation method disclosed by the invention can realize 90% of benzene conversion rate at the reaction temperature of about 210 DEG C under the reaction conditions that the air speed is up to 60000mL / (g.h), the benzene concentration is 1000ppm and the oxygen content is 20%.

The invention discloses modified silicon dioxide microspheres for high performance liquid chromatography and a preparation method of the modified silicon dioxide microspheres, and relates to the technical field of chromatographic packing. When the modified silicon dioxide microspheres for the high performance liquid chromatography are prepared, firstly, (perfluorohexyl) benzene reacts with isophthaloyl dichloride to prepare a perfluorohexyl benzophenone compound; the preparation method comprises the following steps: reacting a perfluorohexyl benzophenone compound with hydrazine hydrate to prepare a perfluorohexyl hydrazone compound; carrying out catalytic decomposition on the perfluorohexyl hydrazone compound to prepare a hydrophobic modified diazo compound; preparing monodispersed non-porous silicon dioxide microspheres by using a sol-gel method; modifying the non-porous silicon dioxide microspheres by an etching template method to prepare mesoporous core-shell silicon dioxide microspheres; and reacting the mesoporous core-shell silicon dioxide microspheres with a hydrophobic modified diazo compound to prepare the modified silicon dioxide microspheres for high performance liquid chromatography. The prepared modified silicon dioxide microspheres for high performance liquid chromatography have the advantages of monodisperse particle size, large specific surface area, small back pressure and high column efficiency.

The invention discloses a sensing material for detecting atmospheric carboxylic acid, a preparation method, a detection method and application, belongs to the technical field of environmental functional materials, and solves the problems that an existing method is complex in operation and cannot realize real-time online monitoring, the sensing material for detecting atmospheric carboxylic acid is an MOF-802-EDTA-Pt composite film, and the preparation method comprises the following steps: taking 1, 3, 4, 5-tetramethyl-1, 3, 5-tetramethyl-1, 3, 5-tetramethyl-1, 3, 5-tetramethyl-1, 3, 5-tetramethyl-1, 3, 5- The preparation method comprises the following steps: synthesizing an MOF-802 material through a hydrothermal reaction by taking 1, 3, 5-benzene tricarbonic acid (BTC) and aluminum nitrate as raw materials and ethylene diamine tetraacetic acid (Na-EDTA) as a ligand; the preparation method comprises the following steps: dispersing MOF-802 in DMF to form a coating solution, and forming a film on a glass substrate through a pulling method; and then loading platinum nanoparticles, and carrying out solvothermal reaction and vacuum drying to obtain the composite sensing film. The MOF-802-EDTA-Pt composite film has a porous structure and fluorescence characteristics, and detection is realized through a fluorescence quenching effect of carboxylic acid molecules and an MOF skeleton. The method disclosed by the invention is controllable in process and high in material stability, still keeps excellent selectivity under the coexistence condition of interferents such as CO2 and NO2, and is suitable for real-time monitoring of carboxylic acid pollutants in the atmospheric environment.

The invention relates to preparation of a crystalline allyl covalent organic framework material and application research of the crystalline allyl covalent organic framework material in benzamide cyclization green photocatalytic conversion. The SF-COF material is prepared by adopting a step-by-step synthesis method. The preparation method comprises the following steps: synthesizing a COF precursor by taking 1, 3-benzenetricarboxaldehyde and p-aminophenylacetonitrile as raw materials, and preparing the allylation covalent organic framework material with the electronic push-pull effect from the COF precursor and 5, 5 ', 5'-(benzene-1, 3, 5-triyl) tri (thiophene-2-formaldehyde) through a solvothermal method. The material is applied to the field of photocatalytic organic conversion, and benzamide cyclization and conversion of derivatives of benzamide are achieved under irradiation of a blue light LED. The prepared SF-COF has the advantages of efficient charge separation and electron conduction performance, good structural stability and chemical stability and the like. And a catalyzed organic reaction substrate has the advantages of wide universality range, good cycle stability and the like, and shows excellent photocatalytic conversion capability.

The present invention belongs to the technical field of anti-corrosion coatings, and discloses an organophosphorus-modified epoxy acrylic resin composite coating and a preparation method thereof. The present invention adopts a phosphorus oxide containing a benzene ring as a reactive group, and realizes the modification of acrylate by grafting an acrylate monomer through the ortho-C-H bond on the activated benzene ring. At the same time, the selected phosphorus oxide can also be connected with layered vermiculite and boron nitride through a covalent bond, which is beneficial to improve the dispersibility of inorganic fillers in the coating, avoid the occurrence of local agglomeration, and strengthen the compactness of the epoxy acrylic resin composite coating. In addition, the introduced organophosphorus compound can also undergo a strong chelating effect with the substrate, and form a stable metal salt passivation film through covalent bond and metal complexation to prevent the erosion of the medium, thereby further improving the salt resistance of the substrate. The modified water-based acrylic resin composite coating prepared by the present invention is green and environmentally friendly, has excellent salt spray resistance and chemical corrosion resistance, and can be widely used in the field of metal corrosion protection.

The invention belongs to the technical field of luminescence and display, and particularly relates to a D-A type green light TADF material and application thereof in OLEDs. The luminescent material comprises an oxygen bridge triphenylboron acceptor unit and oxygen bridge triphenylamine which are used as donor units, and a green light TADF material is constructed through simple coupling. The rigid large plane structure of the material limits rotation of a benzene ring, vibration relaxation of a condensed ring structure is reduced, and the photoluminescence efficiency as high as 90% is obtained. Research results show that the maximum emission peak of the device is 518 nm and the maximum external quantum efficiency (EQE) of the device is 37.8% under different doping concentrations when the OLEDs are processed by the solution, especially under the doping concentration of 5-100%, the electrogenerated emission peak change of the device is small, the EQE of 30% or above is kept, the excellent concentration quenching inhibition performance is shown, and the application prospect is attractive.

This aromatic polyether comprises a structural unit represented by formula (a) and a structural unit represented by formula (b), and has a radical content of 6.5 × 1015 to 9.0 × 1017 (spin / g) at 25℃ as measured using TEMPOL as the standard substance and benzene as the solvent of the standard substance.

The invention provides a metronidazole gel composition and a preparation method thereof, the metronidazole gel composition comprises the following components in percentage by weight: 0.5-1.0% of metronidazole, 0.5-0.7% of benzene-free carbomer, 1.0-5.0% of a humectant, 0.05-0.15% of a preservative, a pH regulator, and / or other pharmaceutically acceptable auxiliary materials, and the balance of water; wherein the metronidazole gel composition does not contain benzene. The metronidazole gel composition is stable in quality and high in safety, particularly, the safety of the gel composition can be further improved by adopting the benzene-free auxiliary material carbomer 980, metronidazole is prevented from making contact with benzene in the long-term external use process, and then the harmfulness of the metronidazole is avoided; moreover, by further optimizing the dosage of carbomer 980, the pH value of the product and the like, the impurities of the product can be better controlled, and the stability of the product is further improved.

The invention provides a preparation method of 2, 5-disubstituted benzyl chloride, and belongs to the technical field of preparation of drug intermediates. The chloromethyl solution is prepared from concentrated hydrochloric acid and paraformaldehyde, the concentration of hydrochloric acid is gradually reduced along with the reaction, and the reaction progress is slow due to the reduction of the concentration of concentrated hydrochloric acid; therefore, the chloromethylation reaction is carried out on the chloromethyl liquid and the disubstituted benzene in the hydrogen chloride gas, and the hydrogen chloride gas is supplemented, so that the concentration of the hydrogen chloride is increased, and the chloromethylation reaction is accelerated; meanwhile, a gradient heating mode is adopted, disubstituted benzene and chloromethyl liquid are subjected to chloromethylation reaction for 2-3 hours at the temperature of 50-60 DEG C, and the temperature is increased to 70-80 DEG C after the concentration of hydrogen chloride is reduced, so that the chloromethylation reaction is accelerated again, and the yield of the product is increased. According to the method, the volatilization and consumption of concentrated hydrochloric acid can be reduced, the generation of wastewater is reduced, the reaction time is shortened, and meanwhile, the yield of 2, 5-disubstituted benzyl chloride is also improved.

The invention discloses an EGFR (epidermal growth factor receptor) targeted nano-drug carrier and a preparation method thereof, the EGFR targeted nano-drug carrier comprises drug-loading nanoparticles, an erythrocyte membrane coating the drug-loading nanoparticles and GE11 peptide connected to the erythrocyte membrane, and the drug-loading nanoparticles are formed by connecting tannic acid, ellagic acid and 1, 4-phenyldiboronic acid through boric acid ester bonds. The EGFR targeted nano-drug carrier disclosed by the invention can be enriched at an EGFR overexpressed tumor site in a targeted manner, and can be effectively prevented from being cleared by an immune system, and the drug loaded by the drug-loaded nanoparticles is released in a high-active oxygen environment, so that the treatment effect on tumors can be improved, and the toxic and side effects on normal tissues can be reduced; and photothermal therapy and chemotherapy effects can be simultaneously generated under NIR illumination, and the anticancer efficiency can be remarkably improved through the synergistic effect of the photothermal therapy and the chemotherapy.

The invention provides an application of N '1, N' 3, N '5-tri ((E)-4-(diphenylamino) benzylidene) benzene-1, 3, 5-tricarbohydrazide (TBTCH) as a piezo-chromic material. The invention provides a novel application of the compound TBTCH, and research shows that the compound has a polycrystalline state property and a piezochromic property, and has two single crystal structures TBTCH-c and TBTCH-g which emit cyan and green fluorescence under different wavelengths; under the action of pressure, the TBTCH-g is converted into an amorphous state from an original crystalline state and is converted into a yellow state sample, and the TBTCH-g can recover to the original state after being fumigated, so that the TBTCH-g has reversible piezochromism performance; and the TBTCH-c changes color under the action of pressure and cannot recover to the original state through a conventional fumigation method, but the TBTCH-g and the TBTCH-c can realize conversion between the TBTCH-g and the TBTCH-c through recrystallization. Therefore, the compound TBTCH can be used as a photochromic material to be applied to the fields of information encryption, intelligent display, biosensing, environmental monitoring and the like.

A process for manufacturing a polyether ketone ketone, involving: placing an aromatic ether or a mixture of aromatic ethers, including at least 50 mol % of 1,3-bis(4-phenoxybenzoyl)benzene, 1,4-bis(4-phenoxybenzoyl)benzene or a mixture thereof, relative to the total number of moles of aromatic ether(s), in contact with an acyl chloride or a mixture of acyl chlorides, and a Lewis acid, in all or part of a reaction solvent, so as to form a reaction mixture, the 1,3-bis(4-phenoxybenzoyl)benzene and / or 1,4-bis(4-phenoxybenzoyl)benzene essentially not being dissolved in the reaction solvent at the end of the step of placing in contact; and, polymerizing the reaction mixture, the polymerization being performed, at least in part, at a temperature Tp greater than or equal to 50° C.; the process including a step of gradual heating of the reaction mixture until acceleration of the polymerization reaction is achieved.

The utility model relates to a negative-pressure crude benzene distillation system adopting a tubular furnace for heating. The negative-pressure crude benzene distillation system comprises a debenzolization tower, the tubular furnace and a crude benzene condensing, cooling and separating integrated device, the debenzolization tower is sequentially provided with a rectifying section, a stripping section, a storage tank section and a regeneration section from top to bottom; the crude benzene condensing, cooling and separating integrated device comprises a heat exchange tower and a separating tank; a low-temperature water heat exchanger is arranged at the lower part of the heat exchange tower; a crude benzene collecting section, an oil-gas-water separating section and a water collecting section are arranged in the separating tank; a first heating section and a second heating section are arranged in the tubular furnace. Compared with an existing negative-pressure crude benzene distillation process system, the negative-pressure crude benzene distillation process system has the remarkable advantages that the tail gas output is low, the tail gas is not discharged, the tube furnace operation temperature is low, the washing oil consumption is small, no additional separated water is generated, the one-time investment is low, and the like.

The invention provides a preparation method of a perovskite solar cell of a self-assembly monomolecular layer based on micromolecule modification, and relates to the technical field of preparation of solar cells, the method comprises the following steps: spin-coating a blended solution on the surface of a substrate, then performing annealing treatment, and forming a modification layer on the substrate; wherein the 1, 4-benzene diphosphonic acid is anchored on the surface of the substrate through a phosphate radical group at one end of the 1, 4-benzene diphosphonic acid, gaps among SAM molecules are filled, a uniformly covered film is formed, and meanwhile, a phosphate radical group at the other end of the 1, 4-benzene diphosphonic acid is exposed on the surface of the modification layer; depositing a perovskite precursor solution on the surface of the formed modification layer, and performing crystallization treatment to form a perovskite light absorption layer; wherein the wettability of the perovskite precursor solution on the surface of the modification layer is improved by the phosphate radical group exposed on the surface of the modification layer. According to the invention, SAM molecular gaps are filled with 1, 4-benzene diphosphonic acid (the coverage rate is greater than 99.5%), and the pinhole defect is thoroughly eliminated.

The invention relates to the technical field of liquid crystal polymers, and discloses a high-temperature-resistant, electricity-conducting and heat-conducting graphene-LCP material and a preparation method thereof.The preparation method comprises the steps that a diacid monomer, p-hydroxybenzoic acid and 4, 4 '-bis (4-hydroxyphthalimide)-benzamido benzene are subjected to a carboxyl reaction, liquid crystal polyarylester is obtained and mixed with graphene oxide, and the high-temperature-resistant, electricity-conducting and heat-conducting graphene-LCP material is obtained. The liquid crystal polyarylester molecular chain contains an imide ring, so that the thermal decomposition mass loss temperature of the liquid crystal polyarylester LCP material can be improved. The liquid crystal polyarylester contains amido bonds and forms strong interaction with hydroxyl and carboxyl on the surface of the graphene oxide, the interfacial compatibility between the graphene oxide and the liquid crystal polyarylester can be improved, the graphene oxide does not need surface modification and has good dispersity in the LCP material, a conductive path is formed, and the conductivity and the antistatic performance are improved.

The invention discloses a preparation method and application of a metal covalent organic framework material, and the prepared metal covalent organic framework material can be used for adsorption separation of elemental iodine pollutants and shows excellent iodine adsorption capacity and rate. According to the preparation method, 1H-pyrazole-4-formaldehyde and copper nitrate trihydrate are subjected to a solvothermal reaction to prepare a copper ion ring trinuclear metal complex with an aldehyde group, and the copper ion ring trinuclear metal complex and 1, 3, 5-tri (4-aminophenyl) benzene are further subjected to a Schiff base reaction to prepare the metal covalent organic framework material containing copper ions. According to the metal covalent organic framework material disclosed by the invention, copper ion active adsorption sites in a chemical structure are also retained while a developed microporous structure is maintained, and the interaction strength of pore channels to iodine is remarkably enhanced, so that the iodine adsorption rate and capacity are remarkably improved. The preparation method is simple, convenient, universal and high in controllability, and large-scale production and manufacturing of the metal covalent organic framework adsorption material can be achieved.