METHODS FOR PREPARING AN ALKYLATION CATALYST, AND FOR ORTHO-ALKYLATING HYDROXYAROMATIC COMPOUNDS; AND RELATED COMPOSITIONS

A method for preparing a solid catalyst composition is described. A magnesium reagent which yields magnesium oxide upon calcination, and which includes reduced levels of chlorides and calcium, is dry-blended with at least one filler. Dry-blending is usually carried out in the absence of a promoter....

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Bibliographische Detailangaben
Hauptverfasser:	DAVANATHAN, NARSI, WATSON, BETH, A
Format:	Patent
Sprache:	eng ; fre
Schlagworte:	ACYCLIC OR CARBOCYCLIC COMPOUNDS APPARATUS THEREFOR CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY CHEMISTRY COMPOSITIONS BASED THEREON GENERAL METHODS OF ORGANIC CHEMISTRY MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS METALLURGY ORGANIC CHEMISTRY ORGANIC MACROMOLECULAR COMPOUNDS PERFORMING OPERATIONS PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL THEIR PREPARATION OR CHEMICAL WORKING-UP THEIR RELEVANT APPARATUS TRANSPORTING
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Beschreibung
Zusammenfassung:	A method for preparing a solid catalyst composition is described. A magnesium reagent which yields magnesium oxide upon calcination, and which includes reduced levels of chlorides and calcium, is dry-blended with at least one filler. Dry-blending is usually carried out in the absence of a promoter. A method for selectively alkylating at least one hydroxyaromatic compound by using the catalyst is also described. A typical product is 2,6-xylenol. Related processes for preparing polyphenylene ethers are described. L'invention concerne un procédé servant à préparer une composition catalytique solide. On mélange à sec avec au moins une charge un réactif de magnésium produisant de l'oxyde de magnésium à la calcination et contenant des niveaux limités de chlorures et de calcium. On effectue habituellement ce mélange à sec en l'absence d'un promoteur. L'invention concerne également un procédé d'alkylation sélective d'au moins un composé hydroxyaromatique au moyen de ce catalyseur. Un produit typique consiste en 2,6-xylénol. Elle concerne également des procédés correspondants servant à préparer des éthers de polyphénylène.