Process for recovery and reuse of ammonia in a liquid ammonia fabric treating system
US4074969A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 21, 1976 |
| Grant date | Feb 21, 1978 |
| Priority date | — |
| Expiry date | Apr 21, 1996 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD06B19/00
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
The disclosure is directed to a system for the recovery of spent ammonia, in connection with the processing of fabrics and the like with liquid ammonia, and concerns particularly the elimination from the recovered ammonia of undesired water. Economic processing of fabrics by liquid ammonia requires recovery and reuse of substantial quantities of ammonia. In the course of processing, the ammonia unavoidably becomes contaminated with water. Separation of water from ammonia on a laboratory level or, in any kind of batch processing is a theoretically simple matter and can be coped with by conventional differential evaporation techniques, or otherwise. However, in a continuously operating processing line where large quantities of anhydrous liquid ammonia are being used as the treating medium, water accumulates rapidly, not only from the fabric being processed, but also from a certain inevitable amount of air leakage in the system. Because so much of any given increment of the treating medium must be recycled, as compared to that actually "used up" in the treating process, water accumulates rapidly in the system and must be removed on a continuous basis. The specification discloses a uni…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.