FIELD: organic chemistry, chemical technology.
SUBSTANCE: invention relates to a method for purifying naphthalene carboxylic acid. Method involves contacting crude naphthalene acid with solvent used for purifying in the presence of hydrogen and catalyst that comprises a precious metal of VIII group taken among palladium, platinum and ruthenium and metal of group IVB taken among silicon, germanium, tin and lead at temperature about from 520 to 575°F. Proposed method provides preparing reduced amount of organic pollution in purified acid as compared with other methods of purification.
EFFECT: improved purifying method.
19 cl, 1 dwg, 5 tbl, 5 ex
| Title | Year | Author | Number |
|---|---|---|---|
| METHOD FOR PREPARING DIMETHYL-1,5-NAPHTHALENE DICARBOXYLATE | 2001 |
|
RU2270830C2 |
| METHOD OF PRODUCING DIALKYL ETHER OF NAPHTHALENE DICARBOXYLIC ACID (VERSIONS) | 2005 |
|
RU2397158C2 |
| METHOD OF PREPARING NAPHTHALENEDICARBOXYLIC ACID DIALKYL ESTER | 1993 |
|
RU2123996C1 |
| METHOD OF PREPARING AROMATIC CARBOXYLIC ACIDS AND METHOD OF PREPARING PURIFIED NAPHTHALENEDICARBOXYLIC ACID | 1993 |
|
RU2128641C1 |
| METHOD FOR OXIDISING OF AROMATIC HYDROCARBONS AND CATALYTIC SYSTEM THEREOF | 2004 |
|
RU2362762C2 |
| DIMETHYLNAPHTHALENE PRODUCTION PROCESS | 1989 |
|
RU2126783C1 |
| AROMATIC CARBOXYLIC ACID PRODUCTION PROCESS | 2001 |
|
RU2259346C2 |
| METHOD OF DIMETHYLTETRALINE SYNTHESIS | 1990 |
|
RU2024471C1 |
| CATALYTIC SYSTEM FOR PROCESSING OF WASTE GAS FOR REDUCTION OF BLOWOUTS OF VOLATILE CHEMICAL MATTERS | 1996 |
|
RU2170135C2 |
| METHOD OF SYNTHESIS OF NAPHTHALENE-2,6-DICARBOXYLIC ACID | 1992 |
|
RU2030386C1 |
