14 results about "Diethylaniline" patented technology

The present invention relates generally to a curable polyurethane prepolymer composition comprising polyurethane prepolymer obtained by the reaction of toluene diisocyanate (TDI) and at least one polyol and an ortho alkyl disubstituted dianiline, preferably 4,4′-methylene-bis-(3-chloro-2,6-diethylaniline) (MCDEA), wherein 50 to 100 wt % of the at least one polyol is at least one polycarbonate polyol.

The invention relates to an imidazole bromide azobenzene ionic liquid catalyst as well as a synthesis method and application thereof. According to the technical scheme, the preparation method comprises the following steps: diazotizing 2, 6-diethylaniline at 0-5 DEG C, and then carrying out coupled reaction on the diazotized 2, 6-diethylaniline and 3, 5-dimethyl sodium phenolate to obtain 4-hydroxy-2, 6-dimethyl-2 ', 6'-diethylazobenzene; the preparation method comprises the following steps: carrying out a nucleophilic substitution reaction on 4-bromoethoxy-2, 6-dimethyl-2 ', 6'-diethylazobenzene and 1, 2-dibromoethane to obtain an intermediate 4-bromoethoxy-2, 6-dimethyl-2 ', 6'-diethylazobenzene; and finally, reacting the intermediate with excessive N-methylimidazole to synthesize the imidazole bromide azobenzene ionic liquid catalyst, namely 4-(N-methylimidazole bromide)-ethoxy-2, 6-dimethyl-2 ', 6'-diethyl azobenzene. The method has the characteristics of simple synthesis method, good water solubility of the catalyst, short reaction time at room temperature, high catalytic efficiency, green and environment-friendly catalytic reaction with water as a solvent, easy separation of products, recyclability of the catalyst and the like.

The utility model provides an N, N-diethylaniline storage tank which comprises a storage part and an isolation part, the isolation part is arranged in the storage part and divides the interior of the storage part into two spaces, and the top of the isolation part is provided with a sealing part for sealing the isolation part; the storage part comprises a storage tank body, a feeding pipe is arranged at the axis of the bottom of the storage tank body, and a discharging pipe is arranged at the edge of the bottom of the storage tank body. When the storage tank is used, the space in the storage tank body is divided into two independent spaces by arranging the isolation pipe in the storage tank body, when N, N-diethylaniline is stored, pressure is shared through the storage tank body and the isolation pipe, the pressure borne by the storage tank body is greatly reduced under the condition that the volume is slightly reduced, and the storage tank is convenient to use. And the service life and the safety of the storage tank body are improved.

The present disclosure provides a polyimide comprising: a dianhydride monomer as a polymerization unit; and a diamine monomer including 4, 4 '-methylenebis (2, 6-diethylaniline) (MEDA) wherein the polyimide is a random copolymer in which polymerized units are irregularly arranged.

The application belongs to the field of preparation and application of catalysts, and provides a preparation method of a catalyst for synthesizing 2,6-diethyl anilino ethyl propyl ether, wherein the catalyst uses copper and aluminum salt as a metal source and an alkali solution as a precipitant, a copper-aluminum spinel catalyst is prepared by using a chemical co-precipitation method, and the catalyst is applied to the synthesis reaction of 2,6-diethyl anilino ethyl propyl ether which is an important intermediate of propamocarb. After process optimization, the application has the advantages of strong reaction selectivity, high yield, good color and high purity of the product, easy availability of the reaction raw material, simple operation, simple post-treatment, and repeated cyclic use of the copper-aluminum spinel catalyst, and not only meets the requirements of green chemistry, but also has important significance for energy saving and emission reduction.

The utility model discloses a 2, 6-diethylaniline catalyst preparation kettle which comprises a preparation kettle, a stirrer and an aluminum powder metering tank, the preparation kettle comprises a kettle body and a kettle cover, the stirrer is rotatably installed on the kettle cover and is driven by a motor installed above the kettle cover to rotate, the kettle cover is provided with an eyepiece, a feed port I and a feed port II, and the eyepiece is connected with the feed port I and the feed port II. The eyepiece is used for observing the internal condition of the preparation kettle; the feeding port I is connected with an aniline storage tank through a feeding pipeline, a flow meter is arranged in the feeding pipeline, the feeding port II is connected with an aluminum powder metering tank through a charging pipeline, a stop valve is arranged in the charging pipeline, and a weight sensor is arranged at the bottom of the aluminum powder metering tank; compared with the prior art, the preparation kettle disclosed by the utility model is simple in overall structure, the addition amount of aluminum powder can be accurately controlled according to the amount of aniline, and agglomeration in the stirring process can be effectively avoided by adopting the ultrasonic generator, so that a product is uniformly dispersed and stable in performance.

The present invention provides a polyimide comprising a dianhydride acid monomer and a diamine monomer containing 4,4'-methylenebis(2,6-diethylaniline) (MEDA) as polymerization units, wherein the polymerization units are arranged irregularly in a random copolymer.

The invention relates to a preparation method of pretilachlor, which is characterized in that 2, 6-diethyl anilinoethyl propyl ether is dropwise added into excessive chloroacetyl chloride for reaction under negative pressure.

The invention relates to the field of industrial manufacturing, and discloses a self-bonding fluororubber mixture and a manufacturing method thereof.The self-bonding fluororubber mixture is used for preparing fluororubber and metal bonding products, and based on 100 parts by weight of the self-bonding fluororubber mixture, the self-bonding fluororubber mixture is prepared from the following raw materials in parts by weight: the fluororubber, the metal bonding products, the fluororubber and the metal bonding products. 60 to 100 parts by weight; 10 to 35 parts by weight of carbon black; 6 to 10 parts by weight of calcium hydroxide; 1 to 5 parts by weight of magnesium oxide; 1 to 5 parts by weight of borane N, N-diethyl aniline; and 1 to 5 parts by weight of gamma-aminopropyl triethoxy silane. On the basis that the inherent characteristics of the fluororubber are reserved, the defects that the fluororubber is low in friction coefficient, smooth in surface, not prone to adhesion and smooth in touch feeling are overcome, and stable adhesion of the fluororubber and a metal base material can be achieved through the hot-pressing vulcanization technology.

An example is directed to a pseudo narcotic propionic acid (PA) formulation including a propionic acid; a synthetic silicon dioxide; and a microcrystalline cellulose (MCC). The pseudo narcotic PA may further include at least one of: phenethyl chloride (PEC), phenethyl bromide (PEB), acetic acid, or N,N-diethyl aniline.

The present invention provides a polyamic acid composition for preparing a soluble polyimide solution, and a soluble polyimide solution prepared therefrom, the polyamic acid composition comprising polyamic acid comprising dianhydride monomers and diamine monomers as polymerization units, wherein the dianhydride monomers comprise 3,3',4,4'-benzophenonetetracarboxylic dianhydride (BTDA), and the diamine monomers comprise 4,4'-methylenebis (2,6-diethylaniline) (MEDA) and 4,4'-diaminodiphenyl ether (4,4'-ODA).

The invention provides a preparation method of a dapoxetine hydrochloride intermediate (R)-3-chlorophenylpropanol. The preparation method is good in safety, convenient to operate, low in cost, good in product quality, high in yield and easier to industrialize. According to the method, the N, N-diethyl aniline hydrochloride is subjected to post-treatment in a vacuum concentration manner, so that the water content in the N, N-diethyl aniline hydrochloride can be remarkably reduced, and further, the hydration loss of (R)-3-chlorophenylpropanol caused by the water content in the N, N-diethyl aniline hydrochloride is avoided; the vacuum concentration mode is simple and convenient to operate, and the product is high in yield and quality.

The application discloses a preparation method of propachlor. By adding a proper amount of a disubstituted amine ether byproduct in the reaction of 2,6-diethyl aniline and chloroethyl propyl ether, the generation of the disubstituted amine ether byproduct in an amine ether synthesis process is inhibited, the selectivity and yield of the amine ether intermediate are significantly improved, and the yield of propachlor is improved. In addition, the disubstituted amine ether byproduct is added as an additive in the amine ether synthesis process, and the disubstituted amine ether byproduct is an inherent impurity in the amine ether synthesis process, so that the disubstituted amine ether byproduct as the additive does not introduce new impurities into the reaction system, and can be separated through a conventional rectification method.

The invention provides a method for preparing a high-purity R-(+)-3-chlorobenzene propanol monospin. The method specifically comprises the following steps: dissolving NaBH4 in ethylene glycol dimethyl ether, sequentially adding N, N-diethylaniline hydrochloride, S-diphenyl amino prolinol and 3-chloropropiophenone, stirring for reaction, adding water for quenching, filtering, and concentrating filtrate under reduced pressure; adding methylbenzene and hydrochloric acid into the concentrated solution, extracting and separating liquid, washing an organic layer with water and a saturated saline solution, drying, filtering, evaporating under reduced pressure to remove a solvent, adding a solvent A and a solvent B into the obtained viscous substance, heating for dissolving, and cooling for crystallization to obtain the product. Wherein the solvent A is one or more of chloroform, dichloroethane, n-heptane, cyclohexane, petroleum ether, acetone and the like; and the solvent B is one or more of methanol, ethanol and isopropanol. The preparation method of R-(+)-3-chlorobenzene propanol provided by the invention is simple in process, the obtained product has high purity while keeping high yield, and a key and stable chiral intermediate is provided for preparing high-quality dapoxetine hydrochloride.