Production method for refined 6-bromo-2-naphthalenecarboxylic acid product
US8940931B2 · kind B2 · utility
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Key dates
| Filing date | Oct 28, 2010 |
| Grant date | Jan 27, 2015 |
| Priority date | — |
| Expiry date | Jan 28, 2031 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C51/43
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
The present invention provides a method, as a means for industrially producing a refined 6-bromo-2-naphthalenecarboxylic acid product from a crude 6-bromo-2-naphthalenecarboxylic acid product, comprising: causing the above crude product to react with sodium hydroxide in water to precipitate a sodium salt of 6-bromo-2-naphthalenecarboxylic acid; performing recrystallization treatment for the obtained precipitate; causing the obtained crystal to react with acid in water to precipitate 6-bromo-2-naphthalenecarboxylic acid; and recovering the obtained precipitate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.