91 results about "Aromatic acid" patented technology

The invention relates to a method for preparing dimethyl terephthalate by catalyzing waste polyester in one step and dimethyl terephthalate. The invention relates to a method for preparing dimethyl terephthalate by catalyzing waste polyester in one step, which comprises the following steps: mixing a waste polyester material, a catalyst and a depolymerization solution for depolymerization reaction to obtain dimethyl terephthalate, the catalyst is selected from aromatic acid, aromatic acid alkali metal salt, a composition of aromatic acid and carbonate, a composition of aromatic acid and phosphate, a composition of aromatic acid and acetate, a composition of aromatic acid alkali metal salt and carbonate and a composition of aromatic acid alkali metal salt and phosphate; and a composition of aromatic acid alkali metal salt and acetate. The invention also provides the dimethyl terephthalate prepared by the method. The method provided by the invention solves the problems of low product purity and yield in the existing polyester waste chemical recovery method, and also solves the problems of high catalyst cost, harsh reaction conditions and easy secondary pollution to the environment in the existing recovery method.

The invention belongs to the technical field of catalysts, and particularly relates to a metal catalyst for oxidative depolymerization of industrial lignin as well as a preparation method and application of the metal catalyst. By controlling synthesis conditions, the alpha-Fe2O3 carrier with a small particle size and a high defect state is obtained, the specific surface area of the catalyst and the exposed number of surface active sites are effectively increased, and the reaction activity and reaction rate of the catalyst are remarkably enhanced. And secondly, Co / alpha-Fe2O3-D, Mn / alpha-Fe2O3-D and Cr / alpha-Fe2O3-D catalysts are prepared by adopting an atomic layer deposition method, so that the metal dispersibility and the interface synergistic effect are effectively improved, the catalysts are endowed with excellent structural stability and sulfur poisoning resistance, and the catalyst is suitable for desulfurization and efficient catalytic conversion of industrial lignin under harsh reaction conditions such as high temperature and high pressure. Experimental results show that after 8 hours of reaction, the depolymerization rate of lignin can reach 60%, the conversion rate of high-added-value products of aromatic aldehyde and aromatic acid exceeds 40%, and the overall performance is obviously superior to the existing similar technical level.

The present application relates to the field of textiles, and specifically discloses a kind of different shrinkage polyester low-elastic yarn and its preparation process, and its preparation process comprises the following steps: using aliphatic diol and aromatic acid as raw materials to carry out esterification reaction to obtain polyester raw materials; modifying the polyester raw materials with a regulator containing at least magnesium hydroxide whiskers and p-hydroxybenzoic acid to obtain primary modified polyester; mixing the primary modified polyester with apocynum fiber powder, modified organic bentonite and a compatibility promoter to carry out modification to obtain melt granulation to obtain modified polyester masterbatch; spraying the obtained modified polyester masterbatch and polyester chips from a convex-shaped spinneret hole, passing through an ultra-short windless zone under a spray washing plate, and then cooling and solidifying in a gradient-distributed uneven manner, and then undergoing low-temperature elasticization treatment to obtain different shrinkage polyester low-elastic yarn; the present application also discloses the different shrinkage polyester low-elastic yarn obtained by the above process, and the present application has the characteristics of having a far-infrared emission function on the basis of obtaining a single-component different shrinkage polyester low-elastic yarn.

The invention is directed to a process for the preparation of an aromatic acid or a phenolic compound, said process comprising reacting a dienophile and a furanic compound comprising an acetal moiety in a Diels-Alders reaction to obtain an aromatic compound comprising said acetal moiety, followed by hydrolysis and oxidation of said acetal moiety into a hydroxide or carboxylate moiety to form the aromatic acid or phenolic compound, wherein said dienophile is selected from the group consisting of alkylenes, acetylenes, acrylates, maleates, fumarates, maleimides, propiolates, acetylene dicarboxylates, and benzynes and wherein said acetal moiety is bound directly to the 2-position of the furanic compound.

The invention discloses amino-terminated hyperbranched polyamide acid as well as a preparation method and application thereof. The amino-terminated hyperbranched polyamide acid is formed by polymerizing an aromatic anhydride monomer, an aromatic triamine monomer and an aromatic diamine monomer; the mole numbers of the aromatic anhydride monomer, the aromatic triamine monomer and the aromatic diamine monomer are a, b and c respectively, a: (b + c) = 1: 1-1: 1.5, and the proportion of b to c is any proportion. The amino-terminated hyperbranched polyamide acid disclosed by the invention not only has abundant terminal amino groups, but also contains a large number of polar groups such as ether bonds, imidazole rings, amide groups and carboxyl groups in molecular chains. Therefore, a stable water-based colloid emulsion can be formed in the presence of water and a small amount of organic solvent, other auxiliaries are not needed, and the interface performance and the mechanical performance of the composite material can be greatly improved.

Provided is a novel compound that can achieve both dielectric properties and desmearability after curing. A radical polymerizable group-containing ester compound according to an embodiment comprises: an ester bond-containing molecule that consists only of one or more first units which each have a structure derived from a polyphenylene ether having hydroxy groups at both terminals, and one or more second units which each have a structure derived from a bifunctional or trifunctional aromatic acid halide and which are bonded to the first units by ester bonds; and a radical polymerizable group that is added to each molecular terminal of the ester bond-containing molecule.

We provide a water-based resin. [Solution] The aqueous resin is an ammonium salt formed by reacting an aromatic acid with an alkaline compound neutralization ring-opening intermediate compound. The alkaline compound neutralization ring-opening intermediate compound is formed by neutralizing the ring-opening intermediate compound with an alkaline compound, and the ring-opening intermediate compound is formed by carrying out a ring-opening reaction of a copolymer containing maleic anhydride using a tertiary amino alcohol. The chemical structures of the copolymer containing maleic anhydride, the tertiary amino alcohol, and the aromatic acid are as follows (wherein the formulas, the symbols are as defined in the specification). TIFF2026092659000036.tif25129

The invention discloses a room-temperature preparation method of ultra-small-size perovskite quantum dots, and belongs to the technical field of ultra-small-size perovskite quantum dots, and the method comprises the following steps: S1, placing CsBr, PbBr2 and aromatic acid powder in a container, adding a polar solvent, and stirring and mixing to obtain a transparent precursor solution; s2, adding an amine solution into the precursor solution to obtain a mixed solution, and adding the mixed solution into an anti-solvent to obtain a quantum dot coarse solution; s3, adding a metal salt solution into the quantum dot coarse solution, stirring, centrifuging, adding an organic solvent into supernate obtained by centrifuging, and centrifuging again to obtain quantum dot precipitates; and S4, dissolving the quantum dot precipitate in a mixed solution of toluene and DMF, and centrifuging again to obtain a clear and transparent quantum dot solution. The quantum dot interface is reconstructed through cooperation of FeBr3 and aromatic acid, so that the quantum dot obtains PLQY close to 100% and shows long-term stability.

The application discloses a modified phthalocyanine pigment, a liquid colorant and a preparation method and application thereof, and belongs to the technical field of pigments and colorants. The modified phthalocyanine pigment comprises the following components in percentage by weight: phthalocyanine pigment 90-99%, pigment derivative 1-10%. The pigment derivative is prepared by sulfonating the phthalocyanine pigment and then modifying the sulfonated phthalocyanine pigment by using a compound containing an amino group and a hydroxyl group and an aromatic acid. The pigment derivative has a benzoate structure. The liquid colorant comprises the following components in percentage by weight: carrier resin 55-90%, modified phthalocyanine pigment 10-40%, and functional additive 0-5%. The liquid colorant prepared by using the modified phthalocyanine pigment has small particle size, low viscosity and good storage stability. When the liquid colorant is applied to in-situ polymerization of polyester, the colored polyester fiber prepared has uniform color, and has good breaking strength, breaking elongation, soaping fastness and rubbing fastness.

The invention discloses a quinazoline-4-one compound containing 1,2,4-triazole [3,4-b] [1,3,4] thiadiazole, a preparation method thereof and antibacterial activity thereof. The compound is represented by general formula (I), and quinazoline-4-one, 1,2-dibromoethane, methyl 4-piperidinate, 80% hydrazine hydrate, potassium hydroxide, carbon disulfide and different aromatic acids are used as raw materials to prepare the target compound through a five-step reaction. The invention introduces an active 1,2,4-triazole [3,4-b] [1,3,4] thiadiazole unit into the quinazoline-4-one structure, and synthesizes a series of quinazoline-4-one compounds containing 1,2,4-triazole [3,4-b] [1,3,4] thiadiazole units, and the compounds have good antibacterial activity.

The invention provides POE (Polyolefin Elastomer) type refrigerating machine oil adaptive to an R32 refrigerant and a preparation method of the POE type refrigerating machine oil. The preparation method comprises the following steps: firstly, carrying out first-stage esterification reaction on pentaerythritol, aromatic acid, C14-C18 straight-chain fatty acid and a first part of C4-C8 branched-chain fatty acid under the action of a solid acid catalyst; and then adding a second part of C4-C8 branched chain fatty acid to carry out second-stage esterification reaction to obtain the POE type refrigerating machine oil, the molar ratio of the pentaerythritol to the aromatic acid to the C14-C18 straight-chain fatty acid to the first part of the C4-C8 branched-chain fatty acid is 1: (0.5-1.5): (0.5-0.8): (0.5-1.0); and the molar ratio of the pentaerythritol to the second part of C4-C8 branched chain fatty acid is 1: (1.2-2.2). The refrigerating machine oil has good intermiscibility with an R32 refrigerant.

This application relates to a corrosion inhibitor for coolants, a method for preparing the same, and a coolant. The corrosion inhibitor comprises: 1 wt% to 5 wt% fatty acid, 0.05 wt% to 0.5 wt% aromatic acid, 0.1 wt% to 1.0 wt% benzotriazole derivative, and 0.1 wt% to 1.0 wt% additives. The benzotriazole derivative has the structural formula shown in Formula I below. In Formula I, R1 to R4 are each independently selected from at least one of fluorine, substituted or unsubstituted C1 to C5 alkyl groups. When substituted, the substituent is selected from fluorine. The corrosion inhibitor for coolants provided in this application, comprising a benzotriazole derivative, can form stable coordination bonds with metal ions in the coolant, thereby reducing the flow resistance of the coolant while improving its corrosion inhibition performance.

This invention discloses a nickel oxide-doped manganese dioxide catalyst, its preparation method, and its application. The catalyst is prepared by in-situ growth of nickel oxide-doped manganese dioxide on a carbon felt substrate using a solvothermal method. In the application, the catalyst electrode is used as the anode, and an aromatic compound is dissolved in an acidic solution as the anolyte. A counter electrode is used in the cathode chamber, and an acidic solution is used as the cathode reaction solution. After the reaction, an aromatic aldehyde or aromatic ketone can be obtained through a post-treatment process. The catalyst of this invention has a high surface area and porous structure, which increases the specific surface area of ​​the electrode, providing a large number of reaction sites and active sites for the oxidation of the substrate. In addition, the doping of nickel oxide provides more active sites for manganese dioxide, promoting the formation of intermediates and also promoting the desorption of the aromatic aldehyde product, preventing the formation of aromatic acids due to over-oxidation. Furthermore, the nanorod-like three-dimensional structure of the catalyst is beneficial for mass transfer.

The application discloses a C-19 modified isosteviol derivative and a preparation method and application thereof, aims to provide an isosteviol derivative with a heart protection activity, transforms a C-19 position of isosteviol, converts a C-19 position carboxyl into a primary amine or isocyanic acid by using a Curtius rearrangement, and further modifies the primary amine to introduce a fatty acid, aromatic acid fragment to convert into an amide fragment, or converts the isocyanic acid into a urea fragment, obtains a series of novel nitrogen-containing isosteviol derivatives by a strategy of reducing one carbon atom, and the nitrogen-containing isosteviol derivatives show good heart protection activity on a zebra fish model of myocardial injury, and can be used for preparing heart protection drugs, and the application relates to the technical field of medicines.

The invention discloses a catalyst for synthesizing dimethyl isophthalate as well as a preparation method and application of the catalyst, and belongs to the technical field of preparation of dimethyl isophthalate. The preparation method disclosed by the invention comprises the following steps: S1, adding a carbohydrate compound and a pore-forming agent into water, and carrying out rotary evaporation to obtain a mixed solid; s2, carbonizing the mixed solid to obtain a porous carbon-based carrier; s3, putting the porous carbon-based carrier, a sulfonating agent and water into a reaction kettle, and sulfonating to obtain the catalyst. When the catalyst obtained through the method is used for preparing dimethyl isophthalate, generation of by-products can be reduced, emission of waste water, waste gas and waste residues can be reduced, meanwhile, the strong acid corrosion risk is avoided, the green chemistry principle is met, and an environment-friendly solution is provided for production of aromatic acid ester compounds.

The invention relates to a synthesis method for preparing an alpha-deuterated amine compound in the technical field of medicines, and belongs to the technical field of chemical pharmacy. The invention particularly relates to a synthesis method of an alpha-deuterated amine compound shown as a formula I. The general formula of the alpha-deuterated amine compound is as shown in a formula I in the specification. The alpha-deuterated amine compound is generated by taking corresponding amine as a substrate, thiol as a catalyst, heavy water as a deuterium source, aromatic acid ester as an additive and esters as a reaction solvent under light irradiation. The compound can be used for drug development or synthesis of other types of deuterated molecules. # imgabs0 #

The present invention relates to a method for manufacturing a polyimide film and a polyimide film manufactured thereby. In one embodiment, the method for preparing a polyimide film includes: preparing a polyamic acid by polymerizing a mixture containing an aromatic diamine and an aromatic acid dianhydride: preparing a first composition containing the polyamic acid, an amine-based catalyst, an acid anhydride-based dehydrating agent, and a solvent; and forming a polyimide film at 150° C. or less using the first composition, wherein the first composition contains the amine-based catalyst and the acid anhydride-based dehydrating agent in a molar ratio of 1:2 to 1:5.

The invention belongs to the field of medicinal chemistry, and particularly relates to ligustrazine stilbene polyphenol aromatic acid ether compounds, pharmaceutically acceptable salts thereof, a preparation method thereof, a pharmaceutical composition and an application of the ligustrazine stilbene polyphenol aromatic acid ether compounds. The ligustrazine stilbene polyphenol aromatic acid ether compound and the pharmaceutically acceptable salt thereof have a remarkable anti-platelet aggregation effect, and can be used for preparing drugs for resisting platelet aggregation, preventing or treating cardiovascular diseases or treating or preventing thromboembolic diseases.

The present invention relates to a mixture, blend or combination, comprising at two, preferably at least three, chosen from the following compounds: (A) a pyrone derivative, (B) a tropolone derivative, (C) a phenylpropanoid, (D) a monoterpene or monoterpenoid, (E) an aromatic acid or salt, (F) a dipeptide, and (G) an alkanediol, and its use as chelating mixture.

The embodiment of the present application provides a kind of patterning material film and its preparation method and application.The patterning material film can be used to form positive pattern, including coordination polymer and the photoacid generator distributed therein;The coordination polymer is connected by transition metal ion or cluster and organic ligand coordination, and the coordination polymer has random network structure;Wherein, organic ligand includes at least one of imidazole substance, aromatic acid with two or more carboxyl in structure.The photoacid generated by photoacid generator in the exposed part of the above-mentioned patterning material film can make the coordination bond of the above-mentioned coordination polymer break, and the exposed part and unexposed part produce solubility difference, and after development, the positive pattern with small critical dimension and low roughness can be obtained.The above-mentioned patterning material film provides a possibility for metal-based patterning material to be used in positive patterning process.

OCULAR KERATINOUS MATERIAL COATING COMPOSITIONS The invention relates to ocular keratinous material coating compositions comprising water, at least one film-forming agent with a low glass transition temperature (Tg), at least one salt of an aromatic acid, and optionally at least one nonionic amphiphilic thickening agent, as well as methods for using such compositions and kits containing such compositions. Figure for abstract: none

This invention belongs to the field of biochemical technology, specifically disclosing a 6′- O A whole-cell biosynthesis method for caffeoyl arbutin and its analogues includes the following steps: using aromatic carboxylic acids and vinyl acetates as substrates, performing a transvinylation reaction under palladium catalyst and base conditions to prepare aromatic vinyl esters; using the prepared aromatic vinyl esters as acyl donors, ... β Arbutin, using acyl acceptors, undergoes an aromatic acylation reaction in an organic solvent with whole cells of Aspergillus oryzae as a catalyst to yield the 6′- O Caffeoyl arbutin or its analogues. This invention develops a two-step whole-cell catalytic method for the efficient and sustainable synthesis of CA and its analogues. The synthesized compounds exhibit potent inhibitory activity against mushroom tyrosinase. This invention pioneers a novel green biosynthetic pathway for tyrosinase inhibitors, demonstrating significant application potential in the food preservation and cosmetics industries.

The invention relates to a catalyst for selective aromatic ring hydrogenation of aromatic acid esters, and a preparation method comprises the following steps: loading a Ni source and a Cu source on a composite carrier by an impregnation method to obtain an oxidation-state catalyst; and reducing the obtained oxidation-state catalyst in a hydrogen atmosphere to obtain the catalyst for selective aromatic ring hydrogenation of aromatic acid ester. According to the method, efficient conversion of bio-based aromatic acid ester is achieved, industrial production of the reaction is facilitated, the method is used for replacing existing petrochemical products, dependence on fossil resources is reduced, and the application range of biomass is widened.

The invention provides pentaerythritol ester base oil and a preparation method thereof. The preparation method comprises the following steps: S1, mixing pentaerythritol, mixed acid and a decolorizing agent, and carrying out autocatalytic esterification under a negative pressure condition to obtain a pentaerythritol ester base oil crude product; s2, filtering the pentaerythritol ester base oil crude product, and then performing deacidification and dehydration treatment to obtain pentaerythritol ester base oil; wherein the mixed acid is composed of monobasic fatty acid, dibasic fatty acid and aromatic acid in a molar ratio of (50-70): 1: (2-5); the molar ratio of the pentaerythritol to the mixed acid is 1: (3.8-5.2). The pentaerythritol ester base oil provided by the invention has a high flash point, a low pour point and a wide use temperature range.

The present invention relates to a ternary aromatic acid terbium complex used as a multifunctional fluorescent probe for Fe 3+ , Cr 2 O 7 2‑ and Arg, and its chemical formula is [Tb 2 (NTB)(CH 3 COO)(OH) 2 (H 2 O)] n , where H 3 NTB is triphenylamine-4,4',4″-tricarboxylic acid. The terbium complex of the present invention, as a fluorescent probe, has obvious recognition effects on Fe 3+ , Cr 2 O 7 2‑ and Arg. After adding 300 μL of Fe ‑3 / Cr 3+ / Cr 2 O 7 2‑ with a concentration of 1×10 ‑3 M, the fluorescence intensity of the terbium complex is significantly quenched, and the fluorescence quenching rates are 94.91% and 97.76% respectively; after adding 300 μL of Arg (1×10 3+ M), the complex shows an obvious fluorescence enhancement phenomenon, and the fluorescence intensity is enhanced by about 4.5 times. Moreover, the recognition effects on Fe 2 O 7 2‑ and Arg are not interfered by other coexisting ions / molecules. When other interfering ions or molecules are added to the solutions containing Fe 3+ , Cr 2 O 7 2‑ and Arg respectively, the fluorescence quenching / enhancement phenomenon is still obvious, indicating that the terbium complex has strong selectivity and specificity for the detection of Fe 3+ , Cr 2 O 7 2‑ and Arg.

The invention discloses vinyl silicone oil and a preparation method thereof, and belongs to the technical field of organic silicon materials. The preparation method comprises the following steps: carrying out vacuum molecular distillation and purification on raw materials, preparing a bidentate carboxylate ligand from hydroxyl-carboxyl bidentate substituted aromatic acid, carrying out ion exchange on the bidentate carboxylate ligand and P5 < + > Cl <-> to prepare a P5 < + >-L catalyst, finally catalyzing ring-opening copolymerization of D4, D4Vi and an end-capping reagent, and carrying out glacial acetic acid quenching, stepped vacuum devolatilization and filtration to obtain the product. The product is applied to the fields of high-end electronics, medical use and the like. In order to overcome the defects of poor catalyst selectivity, non-uniform vinyl distribution and high residue in the prior art, the invention provides a bidentate ligand phosphazene salt catalytic system, realizes selective polymerization of monomers through the synergistic effect of bidentate coordination and zwitterions, solves the problems of continuous blocks of MeViSiO units, metal residues and excessive volatile impurities, and improves the yield of the catalyst. The product is high in purity and stable in performance, and meets the requirements of high-end fields.

This invention discloses a system and process for extracting aromatic acids from the oxidation residue of PTA production. The system includes a residue dryer, a primary mill, a secondary mill, a first collector for collecting benzoic acid, and a second collector for collecting isophthalic acid. The primary mill has a conical shell that is wider at the top and narrower at the bottom. A vertical rotating shaft is installed at the center of the conical shell, and several grinding wheels distributed from top to bottom are mounted on the vertical rotating shaft. The top of the conical shell has a feed pipeline connected to a drying tank and a first gas phase pipeline connected to the first collector. The bottom of the conical shell has a second slag discharge pipeline connected to the secondary mill. This invention, by using a primary and secondary mill and employing a sublimation grinding method to extract benzoic acid and isophthalic acid, ensures extraction purity, improves sublimation efficiency, and increases the extraction yield of benzoic acid and isophthalic acid. The process described in this invention is simple, has low input and operating costs, reliable performance, and high purity.

This invention discloses a method for large-scale preparation of fluorescent carbon dots (CDs) with different fluorescence emission using solvent engineering. The method includes the following steps: using aromatic anhydride derivatives and aromatic amine derivatives as raw materials, and controlling the raw material ratio and reaction time via a one-step microwave-assisted method, four CDs emitting fluorescence ranging from blue to red were prepared, with fluorescence quantum yields of 28.6%, 26.8%, 20.9%, and 7.8%, respectively. By amplifying the reactants, CDs can be prepared on a large scale under ambient pressure, enabling the mass production of fluorescent CDs with different wavelengths. The fluorescent CDs with different wavelengths prepared by this invention possess abundant surface functional groups, high fluorescence quantum yields, uniform particle size distribution, and biocompatibility. They can be synthesized in large quantities in a short time and can be widely applied in fields such as analytical detection, information encryption, cell imaging, and disease diagnosis and treatment.

The invention provides a recombinant saccharomyces cerevisiae strain for improving the yield of aromatic acid as well as a construction method and application of the recombinant saccharomyces cerevisiae strain. A saccharomyces cerevisiae strain PC01 for synthesizing protocatechuic acid and p-coumaric acid is used as a chassis, fbp1, pfk1, pfk2 and shb17 are knocked out, and an endogenous escape path and invalid cycle of saccharomyces cerevisiae are blocked. Meanwhile, a p-coumaric acid synthesis pathway is knocked out, so that the inhibition of p-coumaric acid on the growth of the recombinant saccharomyces cerevisiae is relieved. Then, overexpressing a protocatechuic acid synthetase gene so as to enhance the metabolic flux of the protocatechuic acid, and overexpressing Aro3D154N, Aro4K229L, EcAroB and EcAroD so as to enhance the synthesis of the main carbon flow to the protocatechuic acid. And finally, integrating other aromatic acid metabolic pathways to realize biosynthesis of salicylic acid, p-hydroxybenzoic acid and gallic acid. And the universality of the engineering strain is verified. The recombinant strain provided by the invention takes glucose as a carbon source, so that not only is the production cost reduced, but also the stable hereditary character can be maintained, and the high yield of aromatic acid is ensured.