Process for separating methyl substituted naphthalene by crystal

Details Process for separating methyl substituted naphthalene by crystal Process for separating methyl substituted naphthalene by crystal

1989-03-07

1991-02-12

Caldarola, Glenn

Chemistry of hydrocarbon compounds

Purification, separation, or recovery

By cooling of liquid to obtain solid, e.g., crystallization,...

C07C 702

Patent

active

049926195

ABSTRACT:
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.degree. c. at the highest and with LHSV of 0.1-6 Hr.sup.-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/cm.sup.2 at a temperature of 80.degree.-150.degree. C. (for 2,6-DMN) or 10.degree.-35.degree. C. (for 2-MN).

REFERENCES:
patent: 2078963 (1937-05-01), Miller
patent: 2570263 (1951-10-01), Nickels et al.
patent: 3590091 (1971-06-01), Skarada et al.
patent: 3855334 (1974-12-01), Angstadt

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