4 results about "Methylamine" patented technology

The present application relates to an environment-friendly water-based industrial anticorrosive coating and a preparation method thereof, and belongs to the technical field of coating. The coating composition comprises chloroether resin emulsion, corrosion inhibition emulsion, barrier agent, slag composite filler, etc. The corrosion inhibition emulsion is prepared by using hexamethylcyclotrisilazane, glycidyl furfuryl ether and 2-furfurylamine in isopropyl alcohol as raw materials and tetramethylammonium hydroxide as catalyst, and then emulsified with deionized water and composite emulsifier after removing isopropyl alcohol. The barrier agent is prepared by modifying the titanium aluminum carbide sheet layer after acid stripping with 3-aminopropyltriethoxysilane. The slag composite filler is prepared by sintering blast furnace slag powder, zeolite powder and potassium dihydrogen phosphate, etching with citric acid, and then modifying with boron nitride and KH-172 silane coupling agent. The coating uses water as the dispersion medium to reduce VOC emissions, and constructs a protective system in multiple dimensions through chemical active corrosion protection, physical layered barrier, dense film formation and interface covalent bonding, and is suitable for harsh corrosion scenes such as industrial heavy-duty corrosion, ships and marine engineering.

The application provides a synthesis method of tolfenpyrad, and belongs to the technical field of medicine synthesis. Methylamine aqueous solution is used for synthesizing methylaminoformic acid ethyl ester with diethyl carbonate. N-[3-methyl-4-(4-trifluoromethylsulfanyl-phenoxy)-phenyl]-urea (arylurea) is used as a starting material to react with the obtained methylaminoformic acid ethyl ester under the action of a catalyst to synthesize biuret. The biuret is subjected to ring closing with diethyl carbonate to generate tolfenpyrad. The synthesis method does not need to use phosgene, is simple to operate, raw materials are easy to obtain, cost is low, and the yield is high.

The application discloses a horizontal high-pressure methylamine full-condensation reactor and a CO2 gas stripping method urea production system. The application adopts a special horizontal high-pressure methylamine condensation reactor and a unique urea high-pressure ring process flow, realizes that the two-step reactions of urea are carried out under the best conditions, and solves the problems of low conversion rate, low by-product steam pressure, high energy consumption and high civil framework of the traditional CO2 gas stripping method urea process. The application has the advantages of simple process, high conversion rate, low energy consumption and low framework.