Title:
ジカルボン酸およびヒドロキシカルボン酸の分離方法
Document Type and Number:
Japanese Patent JP4249260
Kind Code:
B2
Abstract:
A first process involves the partial electrodialysis of a dialkali metal salt of an aromatic hydroxycarboxylic acid or a dicarboxylic acid to produce the approximate monoalkali metal salt and the alkali metal hydroxide. The monoalkali metal salt is then treated with an acid such as a bisulfate to recover the aromatic hydroxycarboxylic acid or dicarboxylic acid. The resulting inorganic salt such as sodium sulfate may then be electrolyzed to sodium bisulfate and NaOH. A second process involves the electrodialysis at elevated temperatures of a (di)alkali metal salt of p-hydroxybenzoic acid produce free p-hydroxybenzoic acid and the alkali metal hydroxide. These are efficient and economical methods for recovering the acid and alkali metal hydroxide values, as well as the parent organic compound, from these dialkali metal salts.
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Inventors:
Citron, Joel, David.
Samuels, Michael, Robert.
Samuels, Michael, Robert.
Application Number:
JP53644497A
Publication Date:
April 02, 2009
Filing Date:
April 07, 1997
Export Citation:
Assignee:
E.I.DU PONT DE NEMOURS AND COMPANY
International Classes:
B01D61/44; C02F1/469; C07C51/02; C07C51/15; C07C65/03; F26B11/12; F26B21/14
Domestic Patent References:
| JP7507598A | ||||
| JP51059073A | ||||
| JP40011492B1 | ||||
| JP64009954A |
Attorney, Agent or Firm:
Yoshikazu Tani
Toshiaki Iwasaki
Kazuo Abe
Toshiaki Iwasaki
Kazuo Abe
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