19 results about "Formate Esters" patented technology

The invention relates to a method comprising the extraction of at least one polyol from a polyol phase, wherein the polyol phase has been obtained through a recycling process (A) comprising an alcoholysis of a polyurethane product (A.1) and a workup of the chemolysis product obtained in the process, with separation of a carbamate phase from said chemolysis product (A.2), wherein the method comprises: reacting (α.1) the polyol phase with an aqueous hydrolysis reagent in the presence of a urethane preparation to obtain a product mixture comprising at least one polyol depleted of the at least one carbamate, and working up (α.2) the product mixture to extract the at least one polyol depleted of the at least one carbamate.

The application belongs to the field of fine chemical industry, and proposes a synthetic route for preparing aromatic diamine from anisyl alcohol through esterification, carbon-carbon (C-C) coupling, nitration and reduction process. In the route, anisyl alcohol is first subjected to esterification reaction to obtain anisyl formate, the formate intermediate is further catalytically converted into a dimer, then the dimer is subjected to nitration to obtain an aromatic dinitro compound, and the nitration product is finally subjected to reduction to obtain the aromatic diamine. The route has high carbon yield and economic value.

The present invention provides a supramolecular hot melt adhesive. The present application also provides a method for preparing a supramolecular hot melt adhesive, comprising the steps of: A) dissolving a diol oligomer or diamine oligomer in a solvent, and reacting the mixture with diisocyanate under the action of a catalyst to obtain an initial reactant; B) mixing 2-amino-4-hydroxyl-6-methylpyrimidine, the initial reactant and a solvent for reaction; C) reacting the reactant obtained in step B) with a multifunctional crosslinking agent to obtain the supramolecular hot melt adhesive. The preparation method of the present invention constructs a supramolecular material with excellent strength, toughness and self-healing ability by a synergistic effect of multiple hydrogen bonds between carbamate or ureido group and pyrimidine group. The effective control of performance of materials can be realized by changing the chemical composition of supramolecular arms, the content of single-capping agent and the functionality of cross-linking agent.

This invention belongs to the field of wastewater treatment technology, specifically relating to a method for degrading phthalic acid ester pollutants using photo-activated periodate. The method involves adding periodate to the reaction system and applying light irradiation. Under light, periodate continuously generates various free radicals, which can attack phthalic acid esters, achieving efficient degradation. Compared with existing advanced oxidation technologies, this invention does not require high-energy ultraviolet light sources or additional catalysts. The reaction conditions are mild, energy consumption is low, and the process is simple. It is suitable for the removal of phthalic acid ester pollutants from industrial wastewater, domestic sewage, and surface water, and has promising engineering application prospects.

Disclosed is a heat-sensitive recording body which comprises, on a supporting body, at least a heat-sensitive recording layer that contains a leuco dye, a developer, and an adhesive. The heat-sensitive recording body is characterized in that the heat-sensitive recording layer contains, as a main first developer, an N, N'-diarylurea-based compound represented by general formula (1) (wherein R2 represents an alkyl group having 1 to 12 carbon atoms, an aralkyl group having 7 to 12 carbon atoms, or an aryl group having 6 to 12 carbon atoms, the aralkyl group and the aryl group may be substituted by an alkyl group having 1 to 12 carbon atoms, an alkoxy group having 1 to 12 carbon atoms, an aryl group having 6 to 12 carbon atoms, or a halogen atom, and the plurality of R2 moieties may be the same or different, A1 represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms, and the plurality of A1 moieties may be the same or different), and contains, as a second developer, at least one compound that is selected from the group consisting of a urea urethane compound represented by general formula (2) and 5-(N-3-methylphenyl-sulfonamide)-N',N"-bis-(3-methylphenyl)-isophthalic acid diamide.

The application discloses a preparation method and application of a levocetirizine hydrochloride intermediate, and a high-quality levocetirizine hydrochloride intermediate is obtained. The method comprises the following steps: taking di(2-chloroethyl)amine as a raw material, performing a formate esterification reaction, performing a (R)-(4-chlorophenyl)(phenyl)methylamine cyclization, and performing reduction to obtain the levocetirizine hydrochloride intermediate, and then performing a substitution reaction to generate the levocetirizine hydrochloride. The method is simple in operation, has less by-product, has a high yield, is easy in raw material obtaining, is low in cost, and is suitable for industrial large-scale production.

This invention discloses a method for synthesizing an aromatic formate ester compound, comprising: Step S1: adding a photosensitizer, a base, an organic solvent, an aryl alkyne, and an organic bromide as reactants into a reaction vessel; Step S2: placing the reaction vessel under visible light irradiation and stirring the reaction vessel under a preset temperature range and atmospheric conditions; Step S3: monitoring the reaction progress, and after the reaction is completed, concentrating the reaction solution under vacuum to remove volatile solvents, and then purifying the reaction solution using column chromatography to obtain the aromatic formate ester compound. The method for synthesizing an aromatic formate ester compound provided by this invention is more environmentally friendly and economical than traditional esterification reactions, and is also highly efficient and simple to operate.

This invention belongs to the field of organic chemical technology and relates to an apparatus and method for preparing N,N-dibutylformamide. The apparatus includes a first distillation column, a second distillation column, a third distillation column, and connecting pipelines. Using the apparatus and method of this invention, high-purity N,N-dibutylformamide can be prepared safely and stably with high reaction efficiency and production capacity, short preparation time, low methyl formate loss, minimal equipment wear, low energy consumption, and high safety and stability.

To provide a thermal recording medium with excellent alcohol resistance, heat resistance, and bleach resistance. [Solution] A thermal recording body comprising a thermal recording layer on a support containing at least a leuco dye, a color developer and an adhesive, wherein the main first color developer of the thermal recording layer is general formula (1): TIFF2026090861000008.tif30170 It contains a compound represented by the formula (2): TIFF2026090861000009.tif22170 A thermal recording body characterized by containing a urea urethane compound represented by and at least one selected from 5-(N-3-methylphenyl-sulfonamide)-N',N''-bis-(3-methylphenyl)-isophthalic acid diamide.

The application provides a method for comprehensive utilization of polyformaldehyde organic alcohol waste liquid resources, comprising the following steps: the polyformaldehyde waste liquid is sent into a kettle heater with stirring function; the kettle heater is used for pretreating the polyformaldehyde waste liquid by adjusting the stirring speed; the pretreatment generates gas phase which enters a separation tower, and meanwhile, solid flocculation and precipitation at the bottom of the kettle are discharged; light components distilled from the top of the separation tower are condensed by a condenser, and then the components are detected by an online analyzer; the online analyzer switches the condensed liquid to a methyl formate storage tank, a benzene storage tank or azeotrope reflux tank according to the detection result; the content of the azeotrope reflux tank is sent into an extraction tank to add water as an extractant for extraction; after extraction, the mixture enters a water separation tank to be separated into layers; the upper benzene organic phase of the water separation tank is refluxed to the top of the separation tower, and the lower water phase is recycled back to the extraction tank; and the heavy components in the kettle of the separation tower are sent into a subsequent crystallization and filtration unit for treatment.

This invention discloses a copper / mesoporous silica catalyst, its preparation method, and its application in the direct synthesis of methyl ester from methanol and ethanol. The catalyst is prepared by ammonia evaporation deposition, using mesoporous silica as a support and loaded with highly dispersed copper species, including metallic copper (Cu). 0 ) and copper oxide (Cu) + and Cu 2+ ), of which Cu + Mostly Cu 0 Secondly, Cu 2+ In small quantities, metallic copper nanoparticles and oxidized copper species are spatially adjacent at the nanoscale, forming a synergistic catalytic microenvironment. The catalyst surface simultaneously possesses weak / medium-strong acidic sites and weak / medium-strong basic sites. Under mild conditions, the catalyst of this invention can achieve highly selective conversion of methanol and ethanol mixtures into methyl formate, methyl acetate, and methyl propionate. Furthermore, the process route is green, safe to operate, and highly atom-economical. The catalyst preparation method is simple and has good stability, providing a new strategy for the clean production of methyl esters.

This invention discloses a mabofloxacin intermediate, belonging to the field of drug synthesis technology. First, aminomethylamine and methyl formate are condensed at low temperature to generate MBX-1. Then, a fluoroquinolone core is constructed using a stepwise process of high-temperature acylation condensation, low-temperature nucleophilic substitution, and intermediate-temperature cyclization to obtain MBX-6. Next, in an optimized toluene system, N-methylpiperazine is introduced into the core via high-temperature nucleophilic substitution. After multi-step purification, MBX-7 is obtained. Finally, the quinolone skeleton is reconstructed through an integrated alkaline hydrolysis-acid-catalyzed cyclization process, followed by temperature-controlled recrystallization purification to obtain mabofloxacin intermediate MBX-9. This invention achieves high-purity, low-residue, and high-yield preparation of mabofloxacin intermediates by establishing a DMF-free green solvent system and a precise temperature control strategy. This effectively solves the industrialization problems of excessive residues, increased side reaction impurities, and low overall yield caused by the use of hazardous solvents in existing technologies.

A method for preparing an intermediate of a uracil compound containing isooxazoline includes the steps of: making 3-amino-4,4,4-trifluorocrotonic acid methyl ester react with substituted aryl carbamate; in a reaction process, continuously evaporating water and byproduct alcohol in the system; and conducting processing to obtain the intermediate of the uracil compound containing isooxazoline. Using this method the selectivity of the reaction and the utilization rate of raw materials are improved; the hydrolysis products, impurities and tar are reduced; the reaction time is greatly shortened; and the productivity is improved. After one recrystallization of crude products, an intermediate product with purity of more than 97% can be obtained, and quantitative yield can be more than 85%.

This invention provides a catalyst for preparing methanol from waste liquid generated during ethylene glycol production from syngas, along with its preparation method and application, belonging to the field of resource comprehensive utilization technology. This invention uses silica as a support to improve the dispersibility of the copper-based catalyst and auxiliary metals in the catalyst, thereby enhancing the catalytic effect. This invention uses a copper-based catalyst, CuZr₂O₃. x Using one or more of Fe, Ce, and K as the main catalyst, the interaction between the auxiliary metal and the copper-based catalyst can be utilized to improve the catalytic effect, thereby enabling methyl formate, methyl acetal, and dimethyl carbonate in the waste liquid from syngas-to-ethylene glycol production to participate in the reaction and form methanol. The results of the examples show that after treating the waste liquid from syngas-to-ethylene glycol production using the catalyst provided by this invention, the methanol content in the liquid product is higher than 92%, achieving resource utilization of the waste liquid from syngas-to-ethylene glycol production.

Thermoplastic polyester polyurethane with shape memory properties and / or with thermoresponsive properties, comprising: - hard segments containing polyurethane units obtained by polyaddition of the isocyanate groups of at least one diisocyanate with the hydroxyl groups of at least one first diol serving as a chain extender to form urethane groups; and - crystallizable soft segments containing polyester units, wherein the polyester units are linked to the hard segments by polyaddition of corresponding polyester diols and / or polyols with the isocyanate groups of the at least one diisocyanate to form urethane groups; and wherein the polyester diols and / or polyols are obtained by polycondensation of the hydroxyl groups of at least one second diol with at least one dicarboxylic acid or with its derivatives to form ester groups.wherein the polyester diols and / or polyols of the polyester units of the soft segments have an average molar mass between 1500 g / mol and 7000 g / mol, wherein the switching temperature of the thermoplastic polyester polyurethane with shape memory properties and / or with thermoresponsive properties, corresponding to the melting temperature of the soft segments, is at least 50°C, and wherein the shape fixing temperature of the thermoplastic polyester polyurethane with shape memory properties and / or with thermoresponsive properties, corresponding to the crystallization temperature of the soft segments, is at least 25°C.

Disclosed are a bicyclic peptide composition and application thereof in skin care, and relate to the technical field of polypeptides, the composition comprising s-mu-conotoxin CnIIIC and a cyclic tetrapeptide-24 aminocyclohexane formate ester.The composition can be used for oil control, acne removal, repair, tightening, wrinkle reduction or anti-aging.

The present application relates to coal chemical technology field, disclose a kind of depth nitric acid reaction and methanol recovery system, including concentration separation section, pre-reaction section, depth reaction section, side cooling cooler, side pump, tower kettle pump, overhead condenser, overhead separation tank, overhead reflux pump.Deep nitric acid reaction and methanol recovery method are also disclosed, separation and recovery of light component, methanol are realized in concentration separation section in raw material liquid, while nitric acid is concentrated, nitric acid concentrate and raw material gas are contacted in pre-reaction section, depth reaction section countercurrent reaction, after reaction gas phase is merged after going downstream system through the gas outlet in the upper portion of depth reaction section and the top exhaust outlet of pre-reaction section, reaction liquid is discharged through the bottom liquid outlet of depth reaction section to tower kettle pump, and pump outlet sends downstream system.The non-catalytic nitric acid recovery technology, high nitric acid recovery rate, while methanol, methyl formate, methylal, water and other separation can be realized, for synthesis gas to ethylene glycol device safe operation, reduce cost and increase efficiency and environmental protection, it is of great significance.

The application discloses a preparation device and a preparation method for continuously synthesizing methyl formate from carbon monoxide and methanol. The device comprises a gas-liquid countercurrent reaction unit, a gas phase circulation unit and a liquid phase treatment and recycling unit. The gas-liquid countercurrent reaction unit adopts a packed tubular reactor, which is internally provided with a packed bed and a gas-liquid distributor to form a gas-liquid countercurrent contact channel. The gas phase circulation unit comprises a condenser, a settling tank, a booster pump, a gas buffer tank and a gas preheater to realize gas phase recycling. The liquid phase treatment and recycling unit comprises a liquid buffer tank, a rectifying tower and a liquid mixer to realize product separation and unreacted substance recycling. The device realizes continuous and efficient synthesis of methyl formate from carbon monoxide and methanol through gas-liquid countercurrent contact reaction, and the purity of the obtained methyl formate product is not less than 97.01%. The application solves the problems of low reaction efficiency and unstable product quality in traditional batch reaction, and realizes continuous and efficient production of methyl formate.