Desiccant reconcentration with control of pollutant gases and vapors
US6375806B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 5, 1994 |
| Grant date | Apr 23, 2002 |
| Priority date | — |
| Expiry date | Oct 5, 2014 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D2257/708
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Unlike standard atmospheric glycol reconcentration units with reboilers, which release into the atmosphere column overheads containing water vapor, VOCs (volatile organic compounds), H2S (hydrogen sulfide) and other gaseous (including vaporous) pollutants extracted from lean glycol, the disclosed apparatus directs the overheads to the plant fuel system, or to a thermal/catalytic oxidation system, or to a compressor which is already in service compressing low pressure lease-produced gas or to a combination of these destinations. The reboiler operating pressure is maintained in the range of about 25 to about 125 PSIA. When using a stripper, which may either be in or downstream of the reboiler, one may for example achieve a 98.5+% TEG concentration at a reboiler pressure of 75 PSIA and a temperature of 390° F., using approximately 10 SCF of stripping gas per gallon of glycol circulated. When a stripper is used, and when used stripping gas is directed to the plant fuel system or to a thermal/catalytic oxidation system or is mixed with low pressure gas for final disposition to sales, fuel or other destinations, stripping gas wastage and expense are reduced. When the column overheads…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.