15 results about "Diethylamine" patented technology

This invention belongs to the field of chemical catalyst preparation technology, and discloses a catalyst for the disproportionation of diethylamine to triethylamine. The catalyst includes a support, and MgO, ZnO, and rare earth oxides supported on the support. The content of each component, based on 100% mass, is as follows: support 80-85%, MgO 5-10%, ZnO 5-10%, and rare earth metal oxides 2-5%. When used for the disproportionation of diethylamine to triethylamine, the catalyst exhibits high diethylamine conversion and high selectivity for the triethylamine product. After separation, unreacted diethylamine can be recycled, while monoethylamine is collected separately or recycled back to the diethylamine synthesis unit, significantly reducing overall costs.

The application relates to a preparation method and application of a formamidinium calcium perovskite photoelectric film, and the preparation method comprises the following steps: preparing a lead iodide solution containing a sacrificing agent, and coating to form a film; then, a formamidinium hydroiodide solution is coated on the film to obtain an intermediate phase film, and the formamidinium calcium perovskite photoelectric film is prepared through annealing; or, a lead iodide solution containing formamidinium hydroiodide and a sacrificing agent is prepared, and the solution is coated to form a film, and the formamidinium calcium perovskite photoelectric film is prepared through annealing; wherein the sacrificing agent is at least one of dimethylamine hydrochloride, dimethylamine hydroiodide, N-methylethylamine hydrochloride, N-methylethylamine hydroiodide, diethylamine hydrochloride or diethylamine hydroiodide. Compared with the prior art, the sacrificing agent is mixed with a perovskite precursor solution in the application, high-quality formamidinium calcium perovskite photoelectric films are obtained through annealing, the sacrificing agent used can be completely volatilized in the process of forming the perovskite film, narrow-band-gap pure formamidinium calcium perovskite films are obtained, and the problem of phase separation is solved.

This invention relates to a method for preparing flame-retardant PA6@SiO2 composite powder. First, nano-SiO2 is modified with phosphoric acid and N,N-di(2-hydroxyethyl)-2-aminoethanesulfonic acid to obtain modified SiO2. Then, the modified SiO2, PA6, a neutral solvent, and diethylamine are mixed, and the flame-retardant PA6@SiO2 composite powder is prepared by a dissolution-precipitation method. The content of diethylamine in the mixture of modified SiO2, PA6, neutral solvent, and diethylamine is 7-9 wt%. This invention utilizes waste PA6 to prepare flame-retardant PA6@SiO2 composite powder, which is beneficial to environmental protection and resource utilization. Furthermore, the prepared composite powder improves the dimensional stability of pure PA6 powder while further forming a P / S / Si / N flame-retardant system, thus imparting flame-retardant properties to the PA6 powder.

This article discloses a lipid prodrug of bromo-lysergic acid diethylamide (2-bromo-LSD) (2-bromo-lysergic acid diethylamide), which achieves improved pharmacokinetic properties and allows for easier long-term administration to patients. The disclosed lipid prodrug is indicated for the treatment of cluster headaches and mood disorders in human subjects.

This invention relates to the field of inkjet printing varnish technology, specifically disclosing a water-based varnish for inkjet printing and its manufacturing method. The manufacturing method of the water-based varnish is as follows: S1. Polyvinyl alcohol resin, hydroxypropyl cellulose, diethylamine, polyethylene glycol, and deionized water are stirred at 40-45°C for 15-20 minutes, and then polycarbodiimide emulsion is added and stirred for another 8-12 minutes to obtain a polyvinyl alcohol resin mixed emulsion; S2. Water-based acrylic resin, polyvinyl alcohol resin mixed emulsion, modified silica-alumina mixture, and deionized water are stirred and mixed to obtain a mixture; S3. The mixture is placed in a wet mill, and polydimethylsiloxane, sodium polyacrylate, sucrose fatty acid ester, and 2,5-tetrahydrofurandimethylethanol are added, followed by wet milling to obtain a grinding material; S4. The grinding material is filtered to obtain a water-based varnish with a viscosity of 10-15 mPa•s.

The application provides a method for determining chiral isomers of pilocarpine hydrochloride by high performance liquid chromatography and application thereof, relates to the technical field of drug analysis, and comprises detecting and analyzing a pilocarpine hydrochloride sample solution by high performance liquid chromatography; wherein a chromatographic column of the high performance liquid chromatography is filled with amylose-tris (3, 5-dimethylphenylcarbamate) silica gel; and a mobile phase of the high performance liquid chromatography comprises n-hexane, methanol and an ethanol solution containing an organic base. The application uses amylose-tris (3, 5-dimethylphenylcarbamate) silica gel as the filling agent of the chromatographic column, and uses a n-hexane-ethanol solution (0.1% diethylamine)-methanol solution with a certain proportion as the mobile phase, so that the separation and analysis of pilocarpine hydrochloride and chiral isomers can be realized, and thus the quality of pilocarpine hydrochloride and its preparation can be accurately controlled.

This invention provides a method for separating sulfur-containing compounds from petroleum products. The method includes: dissolving the petroleum product to be treated in a first solvent to obtain an oil sample; sequentially wetting and activating a solid-phase extraction column using a first solvent and a second solvent; then adding the oil sample dropwise into the solid-phase extraction column, wherein the packing material in the solid-phase extraction column includes a strong cation exchange material modified with silver ions; after the added oil sample has completely entered the packing material of the solid-phase extraction column, eluting the solid-phase extraction column sequentially using a first solvent, a second solvent, and a third solvent to collect a first eluent, a second eluent, and a third eluent; wherein the first solvent is selected as a volatile non-polar or polar organic solvent; the second solvent includes acetone with a volume content of not less than 50%; and the third solvent is a mixture of a strongly polar solvent and diethylamine.

This invention discloses a method for producing high-purity (1R,2S,5R)-WS-3, comprising the following steps: using a mixture of menthol containing eight stereoisomers or naturally extracted menthol as raw material, and reacting it with diethylamine and phosgene under solvent-free conditions at 55-65°C; using a non-chiral adsorbent to separate six diastereomers of (1R,2S,5R)-WS-3 from the obtained WS-3 mixture, and then using a chiral adsorbent to separate the remaining two enantiomers, thus obtaining high-purity (1R,2S,5R)-WS-3. This invention achieves the production of high optical purity (1R,2S,5R)-WS-3 menthol amide cooling agent under mild operating conditions, and has significant industrial application value for the efficient production and quality upgrading of cooling agents.

The present application relates to the technical field of corrosion inhibitor, in particular to an oil-soluble corrosion inhibitor for preventing hydrogen sulfide corrosion and a preparation method thereof; the corrosion inhibitor comprises the following components in parts by weight: solvent 80-100 parts, main agent 30-45 parts, barium petroleum sulfonate 5-15 parts, sodium benzoate 10-15 parts, and oxygen scavenger 3-8 parts; the main agent comprises the following components in parts by weight: stearic acid 4-6 parts, hydroxyethyl ethylenediamine 5-8 parts, diethylamine phosphate 6-9 parts, methanol 5-7 parts, and toluene 10-15 parts; the corrosion inhibitor of the present application can form a protective film on the surface of metal by the cooperation of the main agent and other additives, and the protective film has a compact and stable structure, which can effectively prevent the surface of metal from being corroded by hydrogen sulfide; and the above-mentioned corrosion inhibitor still has good corrosion inhibition performance under high temperature conditions, and can effectively protect oilfield equipment.

The application provides a detection method for determining methionine and impurities thereof by using high performance liquid chromatography, comprising the following steps: A) dissolving a sample to be detected by using water to obtain a test sample solution; B) determining the test sample solution by using high performance liquid chromatography to obtain a chromatogram of the test sample solution; and chromatographic parameters are as follows: a chromatographic column is an XB-SCX column; a mobile phase is an isocratic elution; and the mobile phase is a water solution containing 0.09%-0.11% formic acid and 0.09%-0.11% diethylamine. The application determines methionine and impurities thereof by using HPLC analysis and detection spectrum, and other components in the test sample solution do not interfere with the detection of methionine sulfoxide and serine; the application can achieve the purpose of rapidly, effectively and simultaneously detecting methionine sulfoxide and serine in methionine, and has good specificity, durability and high detection sensitivity.

The present application belongs to the field of pharmaceutical preparation, and particularly relates to a gel patch preparation containing diclofenac diethylamine salt. In the patch, the active pharmaceutical ingredient diclofenac diethylamine salt is dissolved in the aqueous solution A in a dissolved state by adding at least one surfactant, at least one cross-linking regulator and at least one tackifier. Then, the gel patch preparation is prepared by mixing the phase A with phase B containing at least one water-soluble polymer material, at least one cross-linking agent, at least one humectant and at least one penetration enhancer. The gel patch preparation disclosed in the present application is prepared more simply, the active compound diclofenac diethylamine salt exists in a dissolved state in the final preparation, the gel patch preparation has good skin followability, is easy to apply and remove, and tearing off does not cause pain.

The application discloses a slow-release bactericidal foam drainage agent and a preparation method thereof, and belongs to the technical field of foam drainage agent preparation. The slow-release bactericidal foam drainage agent is composed of the following components in parts by weight: 30-50 parts of distilled water, 6-12 parts of a surfactant, 4-10 parts of a slow-release bactericide, 3-11 parts of a protective agent, 1-4 parts of a stabilizer and 0.4-2 parts of a pH regulator. The slow-release bactericide is prepared from 3-chloropropionic acid, dipentaerythritol, triallylamine, cetyltrimethylammonium bromide, tetraethyl orthosilicate and gamma-aminoethylaminopropyltrimethoxysilane; and the protective agent is prepared from p-cycloaromatic hydrocarbon, 1,1-dichlorodimethyl ether, p-toluenesulfonamide, diethylamine and p-toluenesulfisothiocyanate. The foam drainage agent prepared by the method has excellent bactericidal effect and can well protect the pipeline from corrosion.

This invention provides a diclofenac diethylamine latex, belonging to the field of topical pharmaceutical preparations. By adding polyoxyethylene (10) oil-based ether, propylene carbonate, and a natural penetration enhancer to the diclofenac diethylamine latex, this invention obtains a latex with good skin permeability, high bioavailability, and good quality stability, which has significant clinical advantages over existing technologies. The preparation process of the diclofenac diethylamine latex of this invention is simple and very suitable for industrial production.

The application discloses a method for recognizing and detecting methanol in an ethanol solution. The method utilizes the transesterification reaction between methanol in a mixed solution and a reactive ester under the promotion of an amine to generate a p-nitrophenol negative ion with ultraviolet absorption. The ultraviolet intensity is detected by using an ultraviolet spectrometer, so that the methanol content can be measured. The method fully utilizes the principle of the transesterification reaction, a catalyst diethylamine, the generation of a p-nitrophenol negative ion (4-NP), the generation of ultraviolet absorption, the detection of the ultraviolet intensity by using the ultraviolet spectrometer, and the purpose of simply, sensitively and specifically detecting the methanol.

The invention provides a synthesis method of 3, 5-bis (difluoromethyl) benzoic acid, which relates to the technical field of organic chemical synthesis and comprises three steps of reaction. The preparation method specifically comprises the following steps: by taking 5-bromoisobenzene dialdehyde as a raw material, firstly reacting with diethylamino sulfur trifluoride to obtain 1-bromo-3, 5-bis (difluoromethyl) benzene; the preparation method comprises the following steps: inserting carbonyl into 1-bromo-3, 5-bis (difluoromethyl) benzene to obtain 3, 5-bis (difluoromethyl) methyl benzoate; and finally hydrolyzing the 3, 5-bis (difluoromethyl) methyl benzoate to obtain the 3, 5-bis (difluoromethyl) benzoic acid. The synthesis method disclosed by the invention is short and feasible in route, cheap and easily available in raw materials and auxiliary materials, high in reaction activity, simple to operate and easy to control, and a target product can be well obtained.