20 results about "Mesitylene" patented technology

This invention provides a method for preparing mesitylene, comprising the following steps: reacting C9 aromatics with methanol in the presence of a catalyst to obtain mesitylene; wherein the reaction temperature is 350–420°C, the reaction pressure is 0.5–5.0 MPa, the molar ratio of methanol to C9 aromatics is 1:1–7:1, and the catalyst is a modified HZSM-5 molecular sieve. In this method for preparing mesitylene, C9 aromatics directly participate in the reaction without separation, resulting in high production efficiency, a short process, and low cost.

The application discloses a preparation method of diphenyl 2,4,6-trimethylphenyl sulfonium trifluoromethanesulfonate. Diphenyl sulfoxide, trifluoromethanesulfonic acid and mesitylene are used as starting materials, and diphenyl 2,4,6-trimethylphenyl sulfonium trifluoromethanesulfonate is generated through reaction under the catalysis of trifluoroacetic anhydride and solid acid, and then the crude product is obtained through liquid separation and concentration, and then the product is obtained through washing and second concentration. The mass ratio of the diphenyl sulfoxide, trifluoromethanesulfonic acid, mesitylene, trifluoroacetic anhydride and solid acid is 1:0.8-1.0:0.7-0.9:2.0-3.0:0.3-0.5. The reaction needs to be carried out in an organic solvent system. The product has high purity, the content of metal impurities can be controlled below 60 ppb, there is only one impurity under liquid phase condition, and the product can fully meet the use requirements as an electronic chemical raw material.

This invention discloses a cyclononenyl bicovalent macroporous covalent organic framework and its preparation method. The framework contains both C-C and B-O covalent bonds, exhibiting a ring-shaped macroporous structure. The preparation method involves mixing 10,15-dihydro-5H-tribenzo[a,d,g][9]cyclononen-2,3,7,8,12,13-hexanol with a diboronic acid monomer at a molar ratio of 3:2, dissolving the mixture in a mixed solvent of mesitylene and dioxane, reacting at 90°C under nitrogen protection, and obtaining the target product after filtration, washing, and drying. The diboronic acid monomer is 1,4-phenylenediboric acid or 4,4''-biphenylenediboric acid. This material has the characteristics of good thermal stability, ideal specific surface area and pore size greater than 2nm. It exhibits excellent adsorption capacity and selectivity for CO2, low-carbon alkanes, acetylene and other substances. It can be used in the separation of low-carbon alkanes, adsorption of dye macromolecules, photoelectrocatalytic carriers and other fields. Moreover, no external transition metal catalyst is required in the synthesis process, which makes it low-cost and environmentally friendly.

The application discloses a sub-micron Py-TPA COF monocrystal wafer and a preparation method thereof, and belongs to the material field. The preparation method of the Py-TPA COF monocrystal wafer comprises the following steps: mixing tetra-(4-aminophenyl)pyrene, p-phthalaldehyde, mesitylene and an acetic acid solution, and performing a solvothermal reaction to obtain the Py-TPA COF monocrystal wafer. The preparation method has the advantages of short reaction time and high reaction yield, and the prepared sub-micron Py-TPA COF monocrystal wafer has uniform morphology and size.

The application discloses a method for catalyzing condensation reaction of biomass acetone by Joule heat, and belongs to the field of biomass catalytic conversion, which comprises the following steps: taking pretreated carbon felt as a heating carrier and a catalyst carrier, loading a catalyst to obtain a composite catalyst; placing the composite catalyst in a reactor and connecting the reactor with a power supply, and then feeding raw gas containing biomass-derived acetone into the reactor; adjusting current or voltage, and using the Joule heat effect of the carbon felt to heat the catalyst bed to a reaction temperature, so that the acetone condensation reaction is carried out to generate mesitylene. The carbon felt is used as the heating carrier, the in-situ rapid heating of the catalyst bed is realized through the Joule heat effect, the electric energy is directly converted into heat energy, the heat transfer loss is greatly reduced, the accurate control and rapid response of the reaction temperature are realized. On this basis, the active catalyst is loaded on the surface of the carbon felt, the energy consumption is significantly reduced under the premise of maintaining the high selectivity of mesitylene, the energy utilization efficiency is improved, and the process flow is simplified.

The application relates to a method and system for purifying durene, and belongs to the technical field of durene purification. The method comprises the following steps: performing primary suspension crystallization on durene-rich liquid at a set cooling speed to obtain primary suspension crystallization slurry with a first temperature; performing solid-liquid separation on the primary suspension crystallization slurry to obtain primary suspension crystallization mother liquor and primary suspension crystallization crystals; performing secondary suspension crystallization on the primary suspension crystallization mother liquor at a set cooling speed to obtain secondary suspension crystallization slurry with a second temperature; performing solid-liquid separation on the secondary suspension crystallization slurry to obtain secondary suspension crystallization crystals; and performing layer-type melt crystallization on the mixed crystals of the primary suspension crystallization crystals and the secondary suspension crystallization crystals to obtain durene crystallization products. Under the synergistic action of the two-stage suspension crystallization and the layer-type melt crystallization, the application can realize high yield and high purity of durene, and the method does not have a gasification and condensation process, and has low energy consumption.

The application discloses a kind of Beta-ZSM-12 composite molecular sieve synthesized by kaolin and a preparation method and application thereof, belong to molecular sieve catalyst technical field.The composite molecular sieve uses kaolin as only aluminum source and part of silicon source, particle size range is 300~3000nm, specific surface area is 600~1000m² / g, pore volume is 0.1~0.5cm³ / g, mesopore size is 2~10nm.Its preparation method includes: after kaolin is treated in alkali solution, Beta seed crystal is prepared by adding template agent and silicon source;Beta-ZSM-12 composite molecular sieve is prepared by kaolin, template agent, silicon source and Beta seed crystal as raw material, by hydrothermal crystallization, calcination and other steps.The composite molecular sieve can be applied to the product containing 2,6-dimethylnaphthalene generated by aromatic hydrocarbons alkylation reaction, and the product containing mesitylene generated by aromatic hydrocarbons isomerization reaction, with higher catalytic activity and selectivity.

This invention relates to a staggered covalent organic framework thin film, its preparation method, and its application, belonging to the field of thin film technology. The invention first dissolves an amine monomer in acetic acid solution to obtain an aqueous solution; then dissolves an aldehyde monomer in mesitylene to obtain an organic solution; finally, the aqueous and organic solutions are added to the aqueous and organic phase chambers of a diffusion cell, respectively, for interfacial polymerization. After the reaction, the membrane material is removed, washed, and dried to obtain the staggered covalent organic framework thin film. This film forms a staggered stacked structure and constructs sub-nanometer transport channels with pore sizes of approximately 0.5 nm to 0.7 nm. Through a synergistic mechanism of Donnan repulsion and hydrogen bonding interactions, it maintains structural stability under extreme environments of high acidity, strong corrosion, and high radiation, achieving highly efficient selective permeation of protons and efficient retention of metal ions in high-level radioactive waste liquids.

This invention discloses a method for constructing an electrocatalytic and immobilized enzyme cascade catalytic inert C-H bond hydroxylation reaction system. The method first uses cobalt nitrate hexahydrate and melamine as precursors to prepare a Co-N@CNTs composite catalyst by pyrolysis under an argon atmosphere. This catalyst is then drop-coated onto a carbon felt surface for in-situ cathodic electrocatalytic generation of hydrogen peroxide. Next, using trialdehyde-resorcinol and 2,4,6-tris(4-aminophenyl)-1,3,5-triazine as ligands, 1,4-dioxane and mesitylene as solvents, and glacial acetic acid as a catalyst, a Schiff base reaction is performed to prepare TpTa COF. This COF is then used as a carrier to immobilize AaeUPO, achieving substrate enrichment and enzyme molecule protection. This cascade system combines electrochemical in-situ hydrogen peroxide production with immobilized enzyme catalysis, efficiently driving the inert C-H bond hydroxylation reaction while effectively inhibiting the damage of high-concentration hydrogen peroxide to the active sites of AaeUPO.

This invention relates to the field of mesitylene production technology, specifically a method for producing mesitylene from C9 aromatics. The method involves reacting C9 aromatics with hydrogen via a hydrodealkylation reaction. The dealkylation products are then separated; the gaseous product is returned to a reverse dealkylation reactor, while the liquid product is separated. The bottom product from the BTX tower is then fed into a mesitylene tower for further separation. The bottom product from the mesitylene tower is then fed into a mixing tower for further separation. The top product from the mixing tower undergoes an isomerization reaction, and the isomerization products are then separated to obtain mesitylene. This invention features a simple process flow, using C9 aromatics as raw material. The combined production process of dealkylation and tricresyl isomerization minimizes side reactions, reduces hydrogen consumption, and allows for further utilization of byproducts. The resulting product contains less than 0.5% methyl ethyl phenyl (MEP), eliminating MEP interference with tricresyl separation, improving the yield and purity of mesitylene, reducing production costs, and enhancing the utilization value of C9 aromatics resources.

This invention discloses a method for preparing a nitrogen-containing heterocyclic D-A type COF photocatalyst and its application. The specific steps are as follows: Step S1, an aldehyde ligand and an amino ligand are added to a Pyrex reaction tube at a molar ratio of 2:3. The aldehyde ligand is a trialdehyde pyrogallol, and the amino ligand is an aromatic amine compound containing a nitrogen-containing heterocyclic ring. Step S2, a mixed organic solvent composed of mesitylene and 1,4-dioxane is added to the Pyrex reaction tube from Step S1, and an aqueous acetic acid solution is added as a catalyst to obtain mixture a. Step S3, the Pyrex reaction tube containing mixture a from Step S2 is ultrasonically treated to form a uniform suspension. This invention relates to the field of functional materials and photocatalysis technology. The structure is precisely designed, and the nitrogen-containing heterocyclic ring significantly modulates the D-A effect. In this invention, the 1,3,5-trihydroxypyrogallol and the nitrogen-containing heterocyclic amine ligand are covalently linked to form a donor-acceptor (D-A) structure with a significant electron push-pull effect within a covalent organic framework.

This invention discloses a diaryl-substituted cyclopentadienyl fused hexabenzoxamethylene derivative and its synthesis method, belonging to the field of organic optoelectronic functional materials technology. This invention utilizes the unique five-membered ring structure to introduce a positive curvature similar to fullerenes into the molecular skeleton by fused cyclopentadienyl groups onto the hexabenzoxamethylene skeleton, thus suppressing excessive molecular aggregation in the solid state. Simultaneously, the introduction of sterically hindered substituents such as mesitylene, triphenylmethyl, and tert-butylphenyl onto the five-membered ring further increases the π-π planar spacing, weakens intermolecular π-π stacking, significantly improves the solubility, film-forming properties, and solid-state luminescence performance of the derivative, and effectively suppresses aggregation-induced fluorescence quenching.

This invention relates to the field of heavy metal ion detection and environmental remediation technology, specifically to a two-dimensional covalent organic polymer, its preparation method, and its applications. This addresses the existing Hg... 2+ The existing detection methods suffer from insufficient sensitivity, complex operation, poor selectivity of adsorbent materials, and difficulty in simultaneously achieving identification and removal. The method of this invention involves placing 2,4-diamino-1,4-benzenedithiol dihydrochloride, 1,3,5-tris(tetra-formylphenyl)benzene, 1,4-dioxane, mesitylene, and an aqueous solution of acetic acid in a high-pressure reactor. The raw materials are then ultrasonically dispersed to a uniform state. The reactor is then placed in an oven for static reaction. After the reaction, the reactor is cooled to room temperature, filtered, washed with acetone, and dried to obtain a two-dimensional organic polymer containing a benzothiazole structure. The two-dimensional covalent organic polymer prepared by this invention exhibits high sensitivity (36 nM) and a rapid response time (90 s) for the detection and adsorption of mercury ions in environmental water.

The application discloses a synthesis method of antioxidant 1330, and aims to provide a synthesis method of antioxidant 1330 with high yield, high purity and recyclable catalyst. 2‑ The application relates to a synthesis method of antioxidant 1330, which is characterized by the following steps: taking SO4 2‑ / ZrO2-MWCNT solid acid as a catalyst, and taking 3,5-di-tert-butyl-4-hydroxybenzyl methyl ether and mesitylene as raw materials to synthesize antioxidant 1330, and belongs to the technical field of synthesis.

The invention discloses a three-dimensional lithium-philic covalent organic framework with an ether oxygen side chain as well as a preparation method and application of the three-dimensional lithium-philic covalent organic framework. The covalent organic framework is prepared by taking tetra (4-formyl phenyl) methane and 2, 5-bis (2-(2-methoxyethoxy) ethoxy) terephthaloyl hydrazine as raw materials, 1, 4-dioxane and mesitylene as solvents and an acetic acid solution as a catalyst through a solvothermal method. The covalent organic framework has good crystallinity and thermal stability, the covalent organic framework is compounded with a lithium cobalt oxide positive electrode through a low-energy ball milling method, a covalent organic framework physical interface layer with multiple lithium-philic sites is constructed, construction of a functional lithium conducting interface is achieved, and the covalent organic framework is suitable for the field of lithium metal batteries.

This invention relates to the field of producing mesitylene from reformed C9 heavy aromatics, specifically a method, apparatus, catalyst, and preparation method for producing mesitylene. The method for producing mesitylene includes removing C9 heavy aromatics from C9 heavy aromatics via a de-heavy tower. 10 The above-mentioned heavy components convert the separated C9 mixed aromatics into dealkylation isomerization products. These products undergo gas-liquid separation to obtain liquid hydrocarbon products, which are then separated in a distillation column. Light components are produced at the top of the distillation column, mesitylene is produced from the side stream, and the bottom product is returned to the heavy hydrocarbon removal column, achieving material recycling. This invention uses reformed C9 heavy aromatics as raw material, developing a highly efficient catalyst and reaction separation process to solve the interference of methyl ethyl benzene in existing processes, retain mesitylene, reduce by-product generation, increase mesitylene yield, improve catalyst stability, extend operating cycle, reduce mesitylene production costs, and enhance the utilization value of C9 mixed aromatics.

The application provides a high-weatherability COFs modified fluorocarbon coating, which comprises 90-140 parts of fluorocarbon resin, 10-50 parts of porous material, 0.5-2 parts of adhesion promoter, 1-2 parts of dispersing agent and 0.5-1 part of defoaming agent; the porous material is a zinc-loaded covalent organic framework material Zn-COFS. A preparation method of the modified fluorocarbon coating is as follows: dimethyl isophthalate, mesitylene, N-methyl pyrrolidone and isoquinoline are mixed, heated and reacted under vacuum, and a covalent organic framework material COFS is collected; a zinc salt is dissolved in a solvent, the covalent organic framework material COFS is added, and a solid is collected after the reaction is completed to obtain the zinc-loaded covalent organic framework material Zn-COFS; the fluorocarbon resin, the Zn-COFS, the adhesion promoter, the dispersing agent and the defoaming agent are mixed and stirred to obtain the COFS modified fluorocarbon coating, which is used for preparing a steel structure anticorrosion coating. The application significantly improves the adhesion, impact resistance and weatherability of the fluorocarbon coating, and overcomes the performance degradation and aging problems of the traditional fluorocarbon coating in long-term application.

This invention provides a method for preparing a catalyst for the isomerization of pseudotrimethylbenzene to mesitylene, comprising: alkali-modifying a mordenite molecular sieve to obtain an alkali-modified molecular sieve; kneading and extruding the alkali-modified molecular sieve with a binder, followed by drying and calcination, acid treatment, and then ammonium exchange to obtain a hierarchical porous HMOR support; using a mixed solution of copper nitrate and copper ammonia complex for metal support, followed by ultrasonic impregnation, drying, and calcination to obtain a copper-loaded catalyst precursor; and then performing weak acid washing to obtain a Cu / HMOR catalyst. This invention employs a step-by-step synergistic modification strategy of "alkali modification + acid treatment + metal support + weak acid washing" to precisely control the pore structure and acidity distribution of the mordenite support, optimizing the metal-support interaction. The catalyst prepared by this method, when used in the hydroisomerization reaction of pseudotrimethylbenzene, simultaneously improves the conversion and selectivity of pseudotrimethylbenzene, increases the yield of mesitylene, and exhibits good stability, making it suitable for industrial production.

The application discloses a copper-loaded covalent organic framework catalyst and a preparation method and application thereof, and the preparation method comprises the following steps: adding silica gel and (3-aminopropyl) triethoxysilane into a solvent and stirring and mixing, filtering to obtain modified silica gel; placing the modified silica gel, triformylphloroglucinol and a mixed solvent of dioxane and mesitylene in a hydrothermal reaction kettle and stirring and reacting; dissolving 4,4'-diphenylamine in a mixed solvent of dioxane and mesitylene, adding the same into the above solution, and simultaneously adding acetic acid as a catalyst; finally, sealing and placing in a constant-temperature oven to react, washing and drying to obtain a COFs carrier; and stirring and reacting the COFs carrier with a copper salt and a solvent, and filtering, washing and drying to obtain a Cu-COFs catalyst. The copper-loaded covalent organic framework catalyst is laid on silica gel material, the catalytic surface area is increased, the recyclability is improved, and the catalyst can be uniformly dispersed on a fixed bed without adding other filling materials by being used as a filling material for filling the fixed bed.