Process for purification of DMT by film crystallization
US5542372A · kind A · utility
4Cited by
7References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 10, 1994 |
| Grant date | Aug 6, 1996 |
| Priority date | — |
| Expiry date | Nov 10, 2014 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC30B29/54
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
This invention relates to a single crystallization process for purification of dimethyl terephtalate (DMT) by film crystallization, including pumping the raw DMT into a film crystallizer and reducing its temperature to form DMT crystalline on the walls of the crystallizing pipes in the crystallizer, and then heating the crystallizing pipes and collecting the melt at 140.degree.-145.degree. C. The product DMT is thus obtained.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.