172 results about "Propylamines" patented technology

The present invention relates to the technical fields of organic chemistry and pharmaceutical chemistry, concretely discloses a synthetic method for a known compound tylosin. The synthetic method comprises the following steps: taking Azithromycin A as a raw material, the protected Azithromycin A can be obtained by Cbz-Cl and then oxidized through a modified Pfitznor-Moffat method, the protected ketone by Cbz can be obtained, ketone is reacted through Wittig-Horner, keto is conversed into alkenyl to obtain the protected alkene, the protected alkene is oxidized to obtain an epoxy compound protected by Cbz, the epoxy compound protected by Cbz is deprotected to obtain a deprotected epoxy compound under the catalysis of Pd / C, the deprotected epoxy compound is reacted with n-propylamine and is performed a ring-opening to obtain a tylosin crude product, the tylosin crude product and acid are carried out a salt forming and purifying, then tylosin can be obtained by resolving. The synthetic route is changed by the method of the invention, the super low-temperature is not employed in the route, and the tylosin enables the effective industrialization production.

The invention provides a CuCe-SAPO-34 molecular sieve catalyst, as well as a preparation method and use thereof. The method comprises the following steps: adding pseudo-boehmite in deionized water, stirring, then adding ortho-phosphoric acid and fumed silica, uniformly mixing, then adding copper salt and tetraethylenepentamine, sufficiently mixing, adding cerate and n-propylamine, loading the completely mixed gel in a hydrothermal reaction kettle to crystallize, cooling at room temperature, separating the solid crystallized product from the mother liquor, washing to neutral, drying, and roasting in air to obtain the CuCe-SAPO-34 molecular sieve catalyst. The CuCe-SAPO-34 molecular sieve catalyst is prepared through the adoption of the hydrothermal synthesis method, and the molecular sieve catalyst with excellent NH3-SCR catalytic activity and water resistance is obtained by adjusting the loading amount of cerium through the control of the input of the cerate.

The invention discloses a synthesis method of imrecoxib and belongs to the field of drug synthesis. The method comprises the following steps: reacting p-toluene acetyl halide with propylamine to produce a compound III p-toluene levulinic amine; reacting the compound III with p-methylsulfonyl chloroacetophenone under an alkaline condition to produce a compound V; and then cyclizing to obtain a compound VII, namely n-propyl-3-(4-methyl phenyl)-4-(4-methylsulfonyl phenyl)-2,5-dihydro-1H-2-pyrrolidone. The method disclosed by the invention comprises simple reaction steps and can be put into industrial production easily.

The invention discloses an anti-tearing flame-retardant cable material. The anti-tearing flame-retardant cable material comprises, by weight, 70-80 parts of ethylene-vinyl acetate copolymers, 20-30 parts of high-density polyethylene, 30-50 parts of gas-phase white carbon black, 10-15 parts of nano crystalline cellulose, 3-4 parts of gamma-(2, 3-trimethoxysilyl) propyl methacrylate, 40-50 parts of magnesium hydroxide, 1-3 parts of melamine cyanurate, 3.5-4.5 parts of gas-phase silicon dioxide, 15-30 parts of dioctyl terephthalate, 15-30 parts of epoxy soybean oil, 0.4-1 part of dicumyl peroxide, 0.5-1.5 parts of zinc oxide, 0.5-1.5 parts of diethylin propylamine, 5-10 parts of maleic anhydride grafting compatilizer, 2-4 parts of Ca / Zn compound stabilizers, 1-2 parts of magnesium stearate, 0.1-0.3 part of antioxidants 1010, 0.1-0.2 part of trioctylphosphine phosphorous acid ester and 1-3 parts of polyethylene wax. The invention further discloses a method for manufacturing the anti-tearing flame-retardant cable material.

The invention relates to a double-component epoxy adhesive for bonding ceramics, a preparation method and using method thereof, belonging to the adhesive field, and aiming at solving the technical problem that the interfacial stress is overhigh owning to great difference of linear expansion coefficients when the existing epoxy adhesive is used for bonding the ceramics. The component A of the double-component epoxy adhesive is prepared by E-44 epoxy resin, E-51 epoxy resin, carboxy terminal butadiene-acrylonitrile, ground quartz, carbon fiber, carbon nano tube, SiC crystal whisker and ultraviolet absorber UV-531, the component B of the double-component epoxy adhesive is prepared by 3-diethylin propylamine, silane coupling agent KH-550, accelerating agent DMP-30 and ground quartz, and the double-component epoxy adhesive is prepared by a mixing method. When the adhesive is used, the adhesive is coated on a surface to be adhered for superimposition and solidification; and the shearing strength of the adhesive can reach more than 60MPa when the adhesive is used for bonding SiC ceramic; the bonding interface is good, an obvious mechanical embedding function is realized between an adhesive layer and a parent metal, and the defects such as cracks, air holes and the like do not exist in the adhesive layer.

The invention discloses a method for synthesizing SAPO-41 (Silico-Alumino-Phosphate-41) molecular sieve by adopting a novel template agent, relates to a synthesis method of the silico-alumino-phosphate molecular sieve, in particular relates to a synthesis method of the silico-alumino-phosphate molecular sieve SAPO-41, and solves the problems that the method for synthesizing the SAPO-41 molecular sieve by using a conventional DPA (Di-n-Propylamine) as the template agent is high in preparation cost, has mixed crystal and is not beneficial for the realization of large-scale industrial production. The method comprises the following steps: firstly, preparing 85 percent by mass of phosphoric acid, pseudo-boehmite, di-n-butylamine, silica sol and distilled water into initial gel; and secondly, crystallizing, cooling to the room temperature, centrifuging, washing, drying, roasting and naturally cooling the initial gel to the room temperature so as to obtain the SAPO-41 molecular sieve. The method has the advantages that firstly, the product is in pure phase; secondly, the synthesis cost of the molecular sieve is greatly reduced; and thirdly, the large-scale industrial production is realized. The method is mainly used for synthesizing the SAPO-41 molecular sieve.

The invention discloses a chemical detergent for clearing hard scales from an air pre-heater, and belongs to the technical field of detergents. The chemical detergent is prepared from the following ingredients in parts by weight: 22-25.5 parts of 3-methoxy propylamine, 8.3-9.7 parts of pentaerythritol phosphate, 11.2-12.9 parts of N,N-dimethylacetamide, 1.4-2.6 parts of sodium hydroxide, 18.8-20 parts of trisodium phosphate, 7.3-8.8 parts of corrosion inhibitor, 5.6-6.4 parts of stripper, 3.2-4.1 parts of penetrant, 2.5-3.3 parts of surfactant, 8.7-9.6 parts of scale inhibitor, 3.5-4.4 parts of dispersant and 45-58 parts of water. The detergent provided by the invention has the advantages of good comprehensive performance, remarkable cleaning effect and stable performance, and can form a protective layer on the surface of the air pre-heater to play roles in inhibiting scales and preventing rust, and thus, the service life of the air pre-heater is prolonged.