| 摘要 |
THE PRESENT INVENTION RELATES TO A PROCESS FOR PREPARING UNSUBSTITUTED OR C1-C4-ALKYL-SUBSTITUTED GAMMA-BUTYROLACTONE BY CATALYTIC HYDROGENATION OF MALEIC ACID AND/OR ITS DERIVATIVES IN THE PRESENCE OF CHROMIUM-FREE CATALYST COMPRISING FROM 10 TO 80% BY WEIGHT OF COPPER OXIDE AND FROM 10 TO 90% BY WEIGHT OF AT LEAST ONE CATALYST SUPPORT SELECTED FROM THE GROUP CONSISTING OF SILICON DIOXIDE, TITANIUM DIOXIDE, HAFNIUM DIOXIDE, MAGNESIUM SILICATE, ACTIVATED CARBON, SILICON CARBIDE, ZIRCONIUM DIOXIDE AND ALPHA-ALUMINUM OXIDE.
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