Method of preparing 2,6-diisopropylnaphthalene.

摘要

Disclosed is a method of producing 2,6-diisopropylnaphthalene by reacting propylene and naphthalene with each other in the presence of an acidic catalyst with recycling the side products after separation of the intended product of 2,6-diisopropylnaphthalene and the heavy residue from the reaction products by distillation, which is characterized in that the content of the following component (A) is controlled to be 3 % by weight or less and that of the following component (B) to be 12 % by weight or less: Component (A): naphthalene derivatives having two isopropyl groups and one alkylene group or two alkyl groups in the naphthalene nucleus and having 22 carbon atoms and a molecular weight of 294 Component (B): naphthalene derivatives having one isopropyl group and one alkylene group or two alkyl groups in the naphthalene nucleus and having 19 carbon atoms and a molecular weight of 252. By controlling the contents of the components (A) and (B), which lower the activity of the catalyst and lower the yield of the product, each to fall within the defined range, the yield of the product 2,6-diisopropylnaphthalene is elevated.