Production method for refined 6-bromo-2-naphthalenecarboxylic acid product
AssigneeAir Water Inc.
InventorsTakeshi Namekata, Ikuo Ito
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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.
Claims2
A production method for a refined 6-bromo-2-naphthalenecarboxylic acid product, comprising:
- causing a crude 6-bromo-2-naphthalenecarboxylic acid 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.
A production method for a refined 6-bromo-2-naphthalenecarboxylic acid product, comprising:
- causing a crude 6-bromo-2-naphthalenecarboxylic acid product to react with potassium hydroxide in water to obtain an aqueous solution;
- acidifying the obtained aqueous solution to obtain a precipitate;
- causing the precipitate 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.
Dependencies are inferred from the claim text.