Method of treating condensates
US6217711A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 10, 1999 |
| Grant date | Apr 17, 2001 |
| Priority date | — |
| Expiry date | Feb 10, 2019 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S203/24
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A method of treating cellulose pulp mill condensates having an MeOH content using an evaporator and a steam stripper having a reboiler, comprising: (a) Collecting a feed liquor stream having at least 50% of the pulp mill MeOH. (b) Feeding the feed liquor stream to the evaporator having at least two heating element sections separated on a motive steam side. (c) Evaporating the liquor in the evaporator to produce a vapor containing at least 40% of the at least 50% of the pulp mill MeOH. (d) Compressing the vapor from (c) to increase the vapor pressure. (e) Using the vapor from (d) as condensing heating media in (c) for the evaporation in a first heating element section of the evaporator and venting a portion of the vapor through the first heating element section. (f) Compressing the vented vapor from the heating elements of the evaporator from (e) to increase the vapor pressure to be used as heating media in the reboiler. (g) Condensing the compressed vapor from (f) in the reboiler while evaporating already stripped condensate fed to the reboiler so that vapor formed in the reboiler flows to stripper. (h) Feeding the condensate from the reboiler and condensate from the evaporator to …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.