Method for cleansing vinyl chloride polymerization reactors
US3998655A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 23, 1975 |
| Grant date | Dec 21, 1976 |
| Priority date | — |
| Expiry date | Jul 23, 1995 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB08B3/08
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Incrustations of vinyl chloride polymers and copolymers are removed from the polymerization reactors by dissolving said incrustations at a temperature above 60.degree. C in a solvent chosen from the substituted amides up to a polymeric compound content in the resulting solution not exceeding 7% by weight, concentrating the resulting solution to a 10-30 wt. % polymeric compound content by evaporating a mixture of solvent and water, extruding the concentrated solution into an aqueous coagulating bath and recovering the spun product. The solvent is recovered by fractional distillation of the vaporized mixture and of the solvent-enriched coagulating bath.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.