Process for preparing 2,6-naphthalene-dicarboxylic acid
US5175354A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Apr 1, 1991 |
| Grant date | Dec 29, 1992 |
| Priority date | — |
| Expiry date | Apr 1, 2011 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C51/416
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
The process of this invention for preparing 2,6-naphthalene-dicarboxylic acid comprises a reaction step (Step A) wherein 2,6-naphthalene-dicarboxylic acid potassium salts consisting of 2,6-naphthalene-dicarboxylic acid dipotassium salt and/or 2,6-naphthalene-dicarboxylic acid monopotassium salt are allowed to react with benzene-carboxylic acids in the presence of water to yield 2,6-naphthalene-dicarboxylic acid and benzene-carboxylic acid potassium salts and a separation step (Step B) wherein the crystallized 2,6-naphthalene-dicarboxylic acid is separated from the benzene-carboxylic acid potassium salts dissolved in the aqueous solution and provides 2,6-naphthalene-dicarboxylic acid, useful as raw material for polymers, at low cost on a commerical scale with recycle of potassium.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.