Production of isocyanate using chlorine recycle
US6010612A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 1, 1997 |
| Grant date | Jan 4, 2000 |
| Priority date | — |
| Expiry date | Oct 1, 2017 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P20/582
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A process and a system produces isocyanate and converts anhydrous hydrogen chloride, which is a by-product of isocyanate production, to chlorine gas in an electrochemical cell. The chlorine is recycled to the isocyanate process. Any unreacted anhydrous hydrogen chloride may be recycled to the electrochemical cell. By recycling the anhydrous hydrogen chloride and the chlorine, the process and system are able to reduce the cost of producing isocyanate. In addition, this process and system process eliminate or at least substantially minimize the problems associated with disposal of anhydrous hydrogen chloride by turning it into a useful starting material in the isocyanate process.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.