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US 7,605,296 B2Granted
Method for separating and purifying 2,6-dimethylnaphthalene
AssigneeHyosung Corporation
InventorsYang-Ho Chenon, Young-Gyo Choi
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Abstract
A method for separating and purifying 2,6-dimethylnaphthalene, is provided in which 2,6-dimethylnaphthalene of high purity is obtained from a mixture of dimethylnaphthalene isomers with a high yield, by means of a combined process of column melt crystallization and sweating operation.
Claims12
A method for separating and purifying 2,6-dimethylnaphthalene, comprising the steps of:
- 1) performing melt crystallization to produce 2,6-dimethylnaphthalene crystals using a column melt crystallization process of adding a mixture of dimethylnaphthalene (DMN) isomers containing 2,6-dimethylnaphthalene to a column crystallization apparatus, melting the mixture in the apparatus, and then cooling a molten liquid of the mixture;
- 2) forming 2,6-dimethylnaphthalene crystal layers by separating the 2,6-dimethylnaphthalene crystals produced in Step 1) from the mother liquor by vacuum suction filtration;
- 3) performing a sweating operation of partially melting the impurities contained on the surfaces of the 2,6-dimethylnaphthalene crystal layers formed in Step 2) and between the 2,6-dimethylnaphthalene crystal layers, while suction filtering the impurities;
- and
- 4) melting the 2,6-dimethylnaphthalene crystals after the sweating operation, and separating and recovering 2,6-dimethylnaphthalene.
2 more elements
Dependencies are inferred from the claim text.