Isomerization catalyst and process

B - Operations – Transporting – 01 – J

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B01J 31/14 (2006.01) B01J 31/04 (2006.01) C07C 5/25 (2006.01) C07C 11/02 (2006.01)

Patent

CA 2181707

A catalyst composition effective for isomerizing alpha-olefin to internal olefin and a process for conducting such isomerization using the catalyst composition are described. The catalyst comprises the combination of an alkyl aluminum alkoxide and a cobalt salt of an organic carboxylic acid or reduced form of such cobalt salt wherein the number of alkoxide groups in the alkyl aluminum alkoxide is sufficiently greater than 1 and sufficiently less than 3 per aluminum atom to provide an active catalyst for catalyzing such isomerization. Typically the alkyl aluminum alkoxide has the formula R3nA1(OR4)p where R3 and R4 are the same or different and are alkyl, n is an integer from 0.75 to 1.85, p is an integer from 1.15 to 2.25 and the sum of n and p is 3. The isomerization process using such catalysts proceeds rapidly and requires no addition of hydrogen to enhance the reaction. Failure to achieve the proper balance between alkoxide and alkyl groups on the alkyl aluminum alkoxide results in an inactive catalyst or a catalyst that is only minimally effective even at high temperatures.

Composition de catalyseur efficace d'isomérisation d'alphaoléfines en oléfines, et procédé de réalisation de ladite isomérisation à l'aide dudit catalyseur. Ce dernier consiste en une combinaison d'un alkylalkoxyaluminium et d'un sel de cobalt d'un acide carboxylique organique ou d'une forme réduite de ce sel dans laquelle le nombre de groupes alkoxydes de l'alkylalkoxyaluminium est suffisamment supérieur à 1 et suffisamment inférieur à 3 par atome d'aluminium pour former un catalyseur efficace pour ce type d'isomérisation. En général l'alkylalkoxyaluminium présente la formule R?3¿¿n?A1(OR?4¿)¿p? où R?3¿ et R?4¿ sont semblables ou différents et sont un alkyle, n est un entier compris entre 1,15 et 2,25, et où la somme de n et de p est 3. Le processus d'isomérisation recourant à ces catalyseurs se déroule rapidement et ne nécessite pas l'adjonction d'hydrogène pour activer la réaction. Le défaut d'équilibre entre les groupes alkoxide et alkyle de l'alkylalkoxyaluminium produit un catalyseur inefficace ou un catalyseur peu efficace même à haute température.

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