| 摘要 |
ACRYLIC ACID IS PREPARED FROM PROPENE BY MEANS OF GAS-PHASE OXIDATION BY A PROCESS IN WHICH A STARTING GAS MIXTURE WHICH CONTAINS PROPENE AND STEAM AND WHOSE MOLAR PROPENE/STEAM RATIO IS 1 AND WHOSE PROPENE CONTENT IS ≤ 5% IS PASSED AT ELEVATED TEMPERATURES THROUGH A FIXED CATALYST BED COMPRISING SUCCESSIVE CATALYST PART-BEDS A AND B, THE PART-BED A PASSED THROUGH FIRST CONTAINING, AS ACTIVE MATERIAL, A MIXED OXIDE CONTAINING THE ELEMENTS MO, BI AND FE AND THE PART-BED B CONTAINING, AS ACTIVE MATERIAL, A MIXED OXIDE CONTAINING THE ELEMENTS MO AND V, IN A MANNER SUCH THAT AT LEAST 96.5 MOL % OF PROPENE ARE CONVERTED IN A SINGLE PASS THROUGH PART-BED A.
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