PREPARATION OF PHENOL AND ITS DERIVATIVES

专利名称：PREPARATION OF PHENOL AND ITS

DERIVATIVES

发明人：LEONID MODESTOVICH KUSTOV,VIKTOR

IGNATYEVICH BOGDAN,VLADIMIRBORISOVICH KAZANSKY

申请号：US09078253申请日：19980513

公开号：US20020040168A1公开日：20020404

摘要：A method and a catalyst are described for selective oxidation of aromaticcompounds (e.g., benzene and its derivatives) into hydroxylated aromatic compounds(e.g., corresponding phenols). For example, benzene can be converted into phenol with ayield of at least 30-40%, and a selectivity on the basis of benzene of at least 95-97%. Theselectivity for this reaction based on NO is at least 90-95%. Therefore, no substantial NOdecomposition or consumption for complete benzene oxidation to CO+COor other sideproducts occurs. Similar results are obtained with benzene derivatives (e.g.,

fluorobenzene, difluorobenzene, phenol), although the selectivity is somewhat lower inthe case of derivatives (e.g., about 80-85% in the case of fluorosubstituted benzenes). Apreferred catalyst for this process is a composition containing a high-silica pentasil-typezeolite (e.g, an HZSM-5 type zeolite) which contains no purposefully introduced additivessuch as transition or noble metals. The catalytic effect is achieved by performing aspecific zeolite modification with strong Lewis acid-base centers of a specific nature. Thismodification can be achieved by a pretreatment comprising two steps: a first conventional

calcination step at 300-600° C., and a second high-temperature calcination step at 600-950° C.

申请人：KUSTOV LEONID MODESTOVICH,BOGDAN VIKTOR IGNATYEVICH,KAZANSKYVLADIMIR BORISOVICH

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