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 PDF

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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
Application number
CA002291722A
Other languages
French (fr)
Other versions
CA2291722C (en
Inventor
Hassan El Shall
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bountiful Applied Research Corp
Original Assignee
Bountiful Applied Research Corporation
Hassan El Shall
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Bountiful Applied Research Corporation, Hassan El Shall filed Critical Bountiful Applied Research Corporation
Priority claimed from PCT/US1997/009418 external-priority patent/WO1998054400A1/en
Publication of CA2291722A1 publication Critical patent/CA2291722A1/en
Application granted granted Critical
Publication of CA2291722C publication Critical patent/CA2291722C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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.
CA002291722A 1997-05-29 1997-05-29 Process for treating spent, waste, alkaline digestion liquor from paper pulping operations and product Expired - Fee Related CA2291722C (en)

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)

* Cited by examiner, † Cited by third party
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

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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