Control vent system for ultra-high purity delivery system for liquefied compressed gases
US6085548A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 24, 1998 |
| Grant date | Jul 11, 2000 |
| Priority date | — |
| Expiry date | Aug 24, 2018 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02E60/32
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A control vent system is disclosed for reducing volatile impurities in a gaseous product of ultra-high purity delivered from a storage vessel containing an inventory of a non-cryogenic liquid product, as well as a method and a system for delivering the product from the storage vessel. The control vent system includes a vent line attached to the storage vessel and a condenser in the vent line. Coolant (e.g., a refrigerant) is transferred between the condenser and a source of coolant, such as a refrigeration unit. The method of reducing volatile impurities includes three steps. The first step is to vent part of the gaseous vapor from the gaseous vapor space to a condenser. The second step is to cool the vented gaseous vapor in the condenser to a temperature below the boiling point of the liquid product and above the boiling points of the volatile impurities. As a result, a first portion of the vented gaseous vapor is condensed and a second portion of the vented gaseous vapor is not condensed. The final step is to vent the second portion of the vented gaseous vapor from the condenser.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.