CA2291722A1 - Process for treating spent, waste, alkaline digestion liquor from paper pulping operations and product - Google Patents
Process for treating spent, waste, alkaline digestion liquor from paper pulping operations and product Download PDFInfo
- Publication number
- CA2291722A1 CA2291722A1 CA002291722A CA2291722A CA2291722A1 CA 2291722 A1 CA2291722 A1 CA 2291722A1 CA 002291722 A CA002291722 A CA 002291722A CA 2291722 A CA2291722 A CA 2291722A CA 2291722 A1 CA2291722 A1 CA 2291722A1
- Authority
- CA
- Canada
- Prior art keywords
- waste
- product
- digestion liquor
- liquor
- alkaline digestion
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Abstract
A water soluble, surface active, polymeric agent is mixed with digestion liquor, preferably with an additional surface active defoamer coagulant agent prior to or during acidification of the alkaline digestive liquor. This results in an easily separable, non-gelatinous, non-gummy, coagulated lignin as a solids, particulate fraction that tends to float on a clarified liquid fraction containing recoverable salts. The solids fraction and the liquid frictions are easily separated, one from the other, by a gravity separation step.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/US1997/009418 WO1998054400A1 (en) | 1993-08-20 | 1997-05-29 | Process for treating spent, waste, alkaline digestion liquor from paper pulping operations and product |
Publications (2)
Publication Number | Publication Date |
---|---|
CA2291722A1 true CA2291722A1 (en) | 1998-12-03 |
CA2291722C CA2291722C (en) | 2006-06-13 |
Family
ID=22261000
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CA002291722A Expired - Fee Related CA2291722C (en) | 1997-05-29 | 1997-05-29 | Process for treating spent, waste, alkaline digestion liquor from paper pulping operations and product |
Country Status (5)
Country | Link |
---|---|
JP (1) | JP2002500707A (en) |
AT (1) | ATE288967T1 (en) |
AU (1) | AU3224797A (en) |
CA (1) | CA2291722C (en) |
DE (1) | DE69732499D1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4670011B2 (en) * | 2005-10-18 | 2011-04-13 | 独立行政法人産業技術総合研究所 | Lignin-containing resin, method for producing the same, and method for separating lignin |
WO2011162420A1 (en) * | 2010-06-25 | 2011-12-29 | ロペスアンドエヌティ有限会社 | Method for recovering lignin in the neutral range from spent pulp cooking liquor |
-
1997
- 1997-05-29 AT AT97927900T patent/ATE288967T1/en not_active IP Right Cessation
- 1997-05-29 AU AU32247/97A patent/AU3224797A/en not_active Abandoned
- 1997-05-29 JP JP50061699A patent/JP2002500707A/en active Pending
- 1997-05-29 CA CA002291722A patent/CA2291722C/en not_active Expired - Fee Related
- 1997-05-29 DE DE69732499T patent/DE69732499D1/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
DE69732499D1 (en) | 2005-03-17 |
JP2002500707A (en) | 2002-01-08 |
CA2291722C (en) | 2006-06-13 |
AU3224797A (en) | 1998-12-30 |
ATE288967T1 (en) | 2005-02-15 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
EEER | Examination request | ||
MKLA | Lapsed |
Effective date: 20170529 |