Crystallizaiton of 2,6-dimethylnaphthalene
AssigneeAmoco Corporation
InventorsThomas G. Smith, John M. Weis, Yenamandra Viswanath
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Abstract
A method for recovering crystalline 2,6-dimethylnaphthalene comprising crystallizing in a scraped-wall crystallizer apparatus at crystallization temperature T, a mixture of low melting components, LM, having melting points of 70.degree. F. and below, and high melting components (HM), including 2,6-dimethylnaphthalene, having melting points above 70.degree. F., such that: ##EQU1## where HM is the total weight percent of high melting components, including 2,6-dimethylnaphthalene, in the mixture, and LM is the total weight percent of low melting components in the mixture, and where T is the temperature of the crystallization in degrees Fahrenheit, and where A is at least 1.0.
Claims18
A method for recovering crystalline 2,6-dimethylnaphthalene comprising crystallizing in a scraped-wall crystallizer apparatus at crystallization temperature T, a mixture of low melting components, (LM), having melting points of 70.degree. F. and below, and high melting components (HM), including 2,6-dimethylnaphthalene, having melting points above 70.degree. F., such that:
- ##EQU7## where HM is the total weight percent high melting components, including 2,6-dimethylnaphthalene, in the mixture, and LM is the total weight percent of low melting components in the mixture, and where T is the temperature of the crystallization in degrees Fahrenheit, and where A is no greater than about 1.0.
A method for crystallizing 2,6-dimethylnaphthalene comprising maintaining, at a temperature sufficient to cause the crystallization of 2,6-dimethylnaphthalene, a mixture comprising 2,6-dimethylnaphthalene, at least one of 1,6- or 1,7-dimethylnaphthalene, and at least about 5 weight percent lights produced during the preparation or isolation of 2,6-dimethylnaphthalene wherein the lights have a boiling point lower than about 470.degree. F.
Dependencies are inferred from the claim text.