The Research Of Styrene Epoxidation With H₂O₂ On TS-1

Styrene epoxide is a kind of fine chemical material and is used as thinner of epoxide resin, spicery, uv-absorbent and steady material. And it is a very important chemical middle material in the fields of organic reaction, medicine industry, spicery industry and so on. Styrene epoxide is produced by halogenate-alcohol method with styrene in industry, which consume a mass of substances and energy, and pollution is graveness. So the method is must improved. But a method of epoxidation is environal friendly green process with H₂O₂ on titanium silicon molecular sieve.A study concerning styrene oxidation for styrene epoxide with H₂O₂ was performed. Effects of different molecular sieve over Ti-containing, different solvent and different additive were studied systematically. Catalyst TS-1, solvent acetone and additive urea with H₂O₂ epoxidation styrene for styrene epoxide is optimal reaction conditions, and the conversion of styrene was over 11%, the selectivity to styrene epoxide was over 67%.Effects of mole ratio of urea to H₂O₂, mole ratio of styrene to H₂O₂, TS-1 dosage, acetone volume , reaction temperature and reaction time with H₂O₂ and urea on TS-1 were studied. Under reaction conditions: 25mmol styrene, mole ratio of urea to H₂O₂ 0.5, mole ratio of styrene to H₂O₂ 3, 0.1g TS-1, 10ml acetone, reaction temperature 60℃and reaction time 10h, the conversion of styrene was 11.85%, the selectivity to styrene epoxide was 67.16%, the utility of H₂O₂ was 83.47%.And a study concerning styrene oxidation for styrene epoxide by the characterization of TS-1 modified by hydrothermal treatment, silylated treatment and organic bases treatment. Catalytic activity by the characterization of TS-1 is higher than that of pure TS-1. The best characterization of TS-1 is by 0.15mol butylamine to treatment TS-1, and the conversion of styrene was 28.92%, the selectivity to styrene epoxide was 77.59%, the utility of H₂O₂ was 96.98%.