| 摘要 |
PURPOSE: A method for preparation of phthalide from phthalic anhydride is provided, thereby preparing phthalide under mild condition, and stably preparing phthalide from phthalic anhydride for a long term. CONSTITUTION: The method for preparation of phthalide from phthalic anhydride comprises hydrogenation of phthalic anhydride in the presence of catalyst of formula (1) of CuO(a)MnO2(b)M(c)SiO2(d) at 180 to 300 deg. C and 1 to 40 atmospheres, wherein a is 40 to 90%, b is 0.15 to 5%, c is 0.001 to 10% and d is 5 to 15%; M is one or more of metal oxides selected from Zn, Pt, Pd, Re, Ru and Rh; and the hydrogen reaction is carried out at 0.05 to 4.0 WHSV(weight hourly space velocity) of phthalic anhydride supplying rate, and a mole ratio of hydrogen and phthalic anhydride of 40-600:1.
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