REGENERATION OF CATALYST FOR PREPARING INDOLES

PURPOSE:To enable the simple regeneration of a catalyst, by subjecting a metal sulfate catalyst deteriorated by using the same in a method for preparing indoles by reacting anilines and ethylene glycol in the presence of said catalyst to heat treatment under a sulfur containing gaseous atmosphere. C...

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Bibliographische Detailangaben
Hauptverfasser:	OODAN KIYOUJI, FUJIWARA YOSHIMI, HAYASHI SHIYUUJI, BANDOU YASUO
Format:	Patent
Sprache:	eng
Schlagworte:	CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY CHEMISTRY CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION ORPROCESSING OF GOODS GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS HETEROCYCLIC COMPOUNDS 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 enable the simple regeneration of a catalyst, by subjecting a metal sulfate catalyst deteriorated by using the same in a method for preparing indoles by reacting anilines and ethylene glycol in the presence of said catalyst to heat treatment under a sulfur containing gaseous atmosphere. CONSTITUTION:A metal sulfate catalyst (e.g., zinc sulfate) deteriorated by using the same in a method for preparing indoles by reacting anilines and ethylene glycol in the presence of said catalyst is subjected to heat reatment under a sulfur containing gaseous atmosphere to be regenerated. As the above mentioned sulfur containing gas, it is pref. to use a gas usually containing a surface component in an amount of 10vol% on the basis of SO2 and a temp. in heat treatment under the sulfur containing gaseous atmosphere is pref. 350-450 deg.C. In addition, a heat treating time is pref. about 2-30hr.