Closely linking a NDA process with a pen process
US6297348A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 22, 2000 |
| Grant date | Oct 2, 2001 |
| Priority date | — |
| Expiry date | Aug 22, 2020 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01J23/44
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Disclosed is a method for closely linking a process for producing 2,6-naphthalene dicarboxylic acid (2,6-NDA) with a process for producing polyethylene naphthalate, thus eliminating the need for drying 2,6-NDA, handling solid 2,6-NDA, and optimizing particle size of 2,6-NDA which comprises: PA1 a) Adding an aqueous slurry of polymer grade 2,6-NDA directly into a process for making PEN, either by directly adding a stream from a 2,6 NDA process into a PEN process, or by adding water to polymer grade 2-6-NDA prior to adding the resulting slurry to a PEN process. PA1 b) Removing the slurry water during the first esterification reaction at the same time the water of reaction is removed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.