Selective cycloalkylation of naphthalene on zeolites
AssigneeMichelin Recherche et Technique S.A.
InventorsJonis Solofo, Patrice Moreau, Patrick Geneste, Annie Finiels
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Abstract
A method of cycloalkylating naphthalene with at least one cyclic group, characterized by the following points: a) as catalyst, there is used a zeolite of faujasite structure having pore openings greater than 6.7 .ANG., the silica/alumina ratio of this zeolite being greater than 2.5 and its residual content of alkaline ion(s) being less than 3%; b) the reaction is carried out batchwise in heterogenous liquid/solid phase at a temperature of between 20.degree. C. and 250.degree. C., under a pressure at most equal to 30 bars. Cycloalkylated naphthalenes are obtained by this method, in particular 2,6-dicyclohexyl naphthalene.
Claims11
A method for preparing a cycloalkyl naphthalene comprising
- forming a reaction mixture comprising naphthalene, a cycloalkylating agent and a solid catalyst, said catalyst being a zeolite of faujasite structure having pore openings of greater than 6.7 .ANG., a silica/alumina ratio of greater than 2.5 and a residual content of at least one alkaline ion of less than 3%;
- and
- reacting the naphthalene and the cycloalkylating agent at a temperature of between 20.degree. C. and 250.degree. C. and a pressure of at most 30 bars for a period of time sufficient to form cycloalkylnaphthalenic products, wherein the molar ratio of cycloalkylating agent to naphthalene is at least one.
A method for preparing 2,6-dicyclohexyl naphthalene comprising
- forming a reaction mixture comprising naphthalene, a cyclohexylating agent and a solid catalyst, said catalyst being a zeolite of faujasite structure having pore openings of greater than 6.7 .ANG., a silica/alumina ratio of greater than 2.5 and a residual content of at least one alkaline ion of less than 3%;
- and
- reacting the naphthalene and the cycloahexylating agent at a temperature of between 20.degree. C. and 250.degree. C. and a pressure of at most 30 bars for a period of time sufficient to form 2,6-dicyclohexyl napthalene, wherein the molar ratio of cyclohexylating agent to naphthalene is at least one.
Dependencies are inferred from the claim text.