Emergency polymerization inhibitor system for vinyl aromatic compounds
US4182658A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 23, 1977 |
| Grant date | Jan 8, 1980 |
| Priority date | — |
| Expiry date | Nov 23, 1997 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S585/956
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Disclosed is a method for preventing the polymerization of a readily polymerizable vinyl aromatic compound during distillation at elevated temperatures within a distillation apparatus which is subject to an emergency condition, such as a power outage. This method comprises force feeding a supplemental polymerization inhibitor having a high solubility in the vinyl aromatic compound, and a long duration of efficiency, into each of the distillation vessels of a conventional distillation apparatus in an amount sufficient to prevent polymerization therein. In the preferred embodiment the supplemental polymerization inhibitor comprises 2,6-dinitro-p-cresol and meta-nitro-para-cresol.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.