Isomerisation of 8C aromatics - using catalysts of groups IV, VII and/or VIII on alumina/de-aluminised mordenite mixts

8C Aromatic fractions, esp. those low in p- and/or o-xylene and rich in m-xylene and/or ethyl benzene, are isomerised in presence of hydrogen at 350-500 degrees C under 10-40 atmos. with hydrogen/hydrocarbon molar ratio of 5 : 1 to 15 : 1. The catalyst consists of a mixt. of alumina, pref. eta-alumi...

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Main Authors KLEMPIN,JUERGEN, NEUBAUER,HANS-DIETER,DR, BERROUSCHOT,HANS-DIETER, HERGETH,HEINZ, WEBER,MANFRED,DR, JOACHIM BARZ,HANS, HEBISCH,HEINZ, BECKER,KARL,DR, LIPPOLD,FELIX, BUSCHINSKY,FRUITZ, DOMS,HANS-GEORG, JOHN,HEINO,DR, FRANKE,HERMANN,DR
Format Patent
LanguageEnglish
German
Published 14.03.1974
Edition1
Subjects
ACYCLIC OR CARBOCYCLIC COMPOUNDS
CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY
CHEMISTRY
METALLURGY
ORGANIC CHEMISTRY
PERFORMING OPERATIONS
PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
THEIR RELEVANT APPARATUS
TRANSPORTING
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Summary:8C Aromatic fractions, esp. those low in p- and/or o-xylene and rich in m-xylene and/or ethyl benzene, are isomerised in presence of hydrogen at 350-500 degrees C under 10-40 atmos. with hydrogen/hydrocarbon molar ratio of 5 : 1 to 15 : 1. The catalyst consists of a mixt. of alumina, pref. eta-alumina with surface area of 250-400 m2/g, and mordenite, contg. elements of Groups IV (inc. rare earths), VII and/or VIII, or their cpds., inc. at least one noble metal, pref. Pt. By varying the mordenite content from 5-50 wt.%, the feed rate can be varied over the range 0.5-5 v/v/h. The mordenite is pref. de-aluminised by treatment with mineral acids to a SiO2/Al2O3 ratio of 12-60 pref. 18-30. In addition to achieving the thermodynamic equilibrium conc. for p-xylene and approx. that for o-xylene, pure ethyl benzene can be selectively isomerised to xylenes.
Bibliography:Application Number: DE19732342481