Process for separating methtl derivatives of naphthalene...

Details Process for separating methtl derivatives of naphthalene... Process for separating methtl derivatives of naphthalene...

C - Chemistry, Metallurgy

07

C

260/715.7

C07C 7/177 (2006.01) C07C 7/00 (2006.01) C07C 7/14 (2006.01) C07C 15/24 (2006.01)

Patent

CA 1309731

ABSTRACT OF THE DISCLOSURE The invention intends to separating a methyl derivative of naphthalene (2,6-dimethyl naphthalene or 2-methyl naphthalene) from a mixture material in a high purity more than 98 weight %. The starting material is preliminarily treated at a raised temperature up to 220°C at the highest and with LHSV of 0 1 - 6 Hr-1 in the presence of an acid catalyst usually used for olefin polymerization. The treated material is distillated to remove the polymerized impurities and to raise the naphthalene derivative content at least up to 50 weight %. And then the obtained material is subjected to the crystallization under a pressure of 500 - 2500 kgf/cm2 at a temperature of 80 - 150°C (for 2,6-DMN) or 10 - 35°C (for 2-MN).

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