Methods of inhibiting polymerization of vinyl aromatic monomers
US10597345B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 2, 2018 |
| Grant date | Mar 24, 2020 |
| Priority date | — |
| Expiry date | May 2, 2038 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C7/20
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Provided herein are methods of inhibiting polymerization of vinyl aromatic monomers. The methods include distilling a vinyl aromatic monomer in a distillation column to form a vinyl aromatic monomer distillate; removing the vinyl aromatic monomer distillate from the distillation column; combining the vinyl aromatic monomer distillate with 4-tert-butylcatechol (TBC) to form a treated distillate; and adding a reflux liquid that includes the treated distillate to the distillation column liquid of the distillation column. An added oxygen gas may be present in a distillation column liquid in an amount of at least 1 ppmw, based on the weight of the vinyl aromatic monomer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.