Catalysts/process to synthesize alkylated naphthalene synthetic fluids with increased alpha/beta isomers for improving product qualities
AssigneeMobil Oil Corporation
InventorsQuang N. Le, Joosup Shim
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Abstract
This application discloses critical parameters, including process conditions and catalysts which effect the alpha:beta ratio of alkylated naphthalene isomers. The use of low alkylation temperatures and of low acidity zeolite catalysts (e.g. steamed USY and zeolite beta) lead to an increase in the alpha:beta ratio. The alkylated naphthalene fluids with higher alpha:beta ratio exhibited significantly enhanced product qualities, including thermal and oxidative stabilities.
Claims30
A process for preparing long chain alkyl-substituted aromatic compounds of increased alpha/beta ratio with respect to acid treated clay catalysts and steamed zeolite catalysts comprising reacting an aromatic compound with an alkylating agent possessing an alkylating aliphatic group having at least six carbon atoms under the following alkylation reaction conditions wherein the temperature varies from about 50.degree. C. to about 300.degree. C. under ambient or autogenous pressure in the presence of an alkylation catalyst comprising a porous crystalline zeolite having an alpha value of less than about 300 alpha to form an alkylated aromatic compound possessing at least one alkyl group derived from the alkylating agent.
A process for preparing long chain alkyl substituted naphthalenes which comprises reacting naphthalene with an olefin containing at least 8 carbon atoms as an alkylating agent under alkylation reaction conditions wherein the temperature varies from about 50.degree. C. to about 300.degree. C., the pressure is ambient or autogenous in the presence of an alkylation catalyst comprising a porous crystalline zeolite having an alpha value of less than about 300 alpha to form an alkylated naphthalene possessing at least one alkyl group derived from the alkylating agent.
A process for preparing long chain alkyl substituted naphthalenes which comprises reacting naphthalene with a olefin containing from about 14 to about 20 carbon atoms as an alkylating agent under alkylation reaction conditions wherein the temperature varies from about 50.degree. C. to about 300.degree. C., the pressure is ambient or autogenous in the presence of an alkylation catalyst comprising a porous crystalline zeolite having an alpha value of less than about 300 to form an alkylated naphthalene possessing at least one alkyl group derived from the alkylating agent.
Dependencies are inferred from the claim text.