Toluene diisocyanate purification method
US11028046B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 12, 2017 |
| Grant date | Jun 8, 2021 |
| Priority date | — |
| Expiry date | Jan 30, 2038 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D5/006
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
The present invention relates to a toluene diisocyanate purification method enabling acquisition of a product having a small amount of dimers in a final product by means of using a reactive dividing wall column during toluene diisocyanate preparation. More particularly, according to the present invention, in order to obtain a product having a small amount of dimers in accordance with a reversible reaction of a monomer and a dimer, a purification procedure is designed by means of applying the temperature, pressure, time of stay and the like of a reactive dividing wall column as appropriate particular conditions, a reboiler having short time of stay and high heat transfer rate is used, and thus a dimerization reaction is inhibited and the purity and yield of the product are enhanced. Therefore, high-purity toluene diisocyanate can be purified and obtained.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.