PRODUCTION OF DIALKYLBENZENE HAVING HIGH CONTENT OF PARA ISOMOR

PURPOSE:To obtain dialkylbenzene having high content of para isomer by subjecting a dialkylbenzene isomer mixture containing ortho isomer at a specific ratio or above to isomerization reaction in the absence of an alkylating agent and presence of a FriedelCrafts catalyst. CONSTITUTION:Benzene (e.g.,...

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Hauptverfasser:	MASAKI SHINZABURO, YAMATO MICHIO, TAKESHITA AKIRA
Format:	Patent
Sprache:	eng
Schlagworte:	ACYCLIC OR CARBOCYCLIC COMPOUNDS APPARATUS THEREFOR CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY CHEMISTRY CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION ORPROCESSING OF GOODS GENERAL METHODS OF ORGANIC CHEMISTRY GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS METALLURGY ORGANIC CHEMISTRY PERFORMING OPERATIONS PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE THEIR RELEVANT APPARATUS TRANSPORTING
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Beschreibung
Zusammenfassung:	PURPOSE:To obtain dialkylbenzene having high content of para isomer by subjecting a dialkylbenzene isomer mixture containing ortho isomer at a specific ratio or above to isomerization reaction in the absence of an alkylating agent and presence of a FriedelCrafts catalyst. CONSTITUTION:Benzene (e.g., benzene, toluene or cumen) which may be alkylated is reacted with an alkylating agent (e.g., propylene) in the presence of a Friedel Crafts catalyst (preferably AlCl3) at 0-120 deg.C for 0. 5-10hr to give an isomer mixture having >=15% o-dialkylbenzene ratio, which is then subjected to isomerization reaction in the absence of an alkylating agent and presence of an Friedel Crafts catalyst (consisting essentially of AlCl3) at 30-100 deg.C to provide the aimed dialkylbenzene having high content of p-isomer. According to the above-mentioned method, paracresol useful as an antioxidant, raw material for medicine and agricultural chemical, etc., is readily obtained.