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The two synthesis methods were thoroughly investigated, systematically, for temperature, molar ratio, and a mass fraction of sulfuric acid. When the mixed acid reacts with m -xylene, the main factors influencing poly-nitro impurities are the reaction temperature and mass fraction of sulfuric acid. Because the mixed acid is used as the nitrating agent, it's impossible to monitor product selectivity and poly-nitro impurities by changing the reaction conditions. In the first step, nitric acid is used as a drying agent to react with m xylene. In the second step, sulfuric acid is introduced to the second microreactor. It serves as a catalyst for initiating the nitric acid in the first step to react with the unconverted m xylene. The yield of mono-nitro products increased to 99%, with throughput of 1 kg/h under the optimal experimental conditions.
Source link: https://doi.org/10.1007/s41981-022-00228-y
Abstract of the paper The use of a polysulfide polymer was synthesized in this research using u03b1, u2032-dichloro-xylene, and aqueous sodium trisulfide. The polymer was cured at 150°C using zinc oxide, stearic acid, and N -cyclohexyl-2-benzothiazole sulfenamide, according to the manufacturer. T _g has risen to the higher temperature in the cured polymer melting peak, which was not observed due to crosslinking and glass transition temperature.
Source link: https://doi.org/10.1134/S1560090422700245
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