Method for distilling ammonia
US6482297B1 · kind B1 · utility
4Cited by
6References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 6, 2001 |
| Grant date | Nov 19, 2002 |
| Priority date | — |
| Expiry date | Jun 6, 2021 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S203/08
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
The present invention relates to an improved process for distilling ammonia from a mixture, more particular from a mixture resulting from the reaction between aminonitrile and water (which reaction is also called cyclizing hydrolysis). The process for distilling the ammonia contained in an aqueous caprolactam solution, uses a column with a bottom temperature less than or equal to 160° C. and at an absolute pressure less than or equal to 5 bar, the ammonia distilled at the top of the column being compressed to a pressure greater than or equal to 10 bar and then condensed at a temperature of 25° C. to 60° C.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.