Iso:alkene prodn. from N-alkene(s) - by isomerisation with fluorinated alumina catalyst in presence of water

Isomerisation of n-alkenes (I) to isoalkenes (II) is effected at 250-550 deg.C using a fluorinated alumina catalyst, with the improvement that (i) the reaction is effected in the presence of 0.5-150 (pref. 2-130)wt.% water, based on the wt. of (I); (ii) fluorine lost from the catalyst is continuousl...

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Hauptverfasser:	HEINRICH,FRIEDRICH, RATAJCZAK,HANS-JOSEF,DR, FRANZ,GERHARD,DR
Format:	Patent
Sprache:	eng ; ger
Schlagworte:	ACYCLIC OR CARBOCYCLIC COMPOUNDS 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 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:	Isomerisation of n-alkenes (I) to isoalkenes (II) is effected at 250-550 deg.C using a fluorinated alumina catalyst, with the improvement that (i) the reaction is effected in the presence of 0.5-150 (pref. 2-130)wt.% water, based on the wt. of (I); (ii) fluorine lost from the catalyst is continuously or periodically replaced by means of a volatile F cpd. (esp. HF); and (iii) the catalyst is regenerated by burning off coke deposits with an O2-contg. gas in the presence of steam. The process is esp. useful for converting n-butenes to isobutene (IIa), which is an intermediate for methyl t.-butyl ether (fuel component) or methyl methacrylate. Addn. of water moderates the activity of the catalyst, giving increased selectivity for (II) and increased stability (longer time between regenerations).