WO1988004706A1 - Method for washing of alcaline pulp - Google Patents
Method for washing of alcaline pulp Download PDFInfo
- Publication number
- WO1988004706A1 WO1988004706A1 PCT/SE1987/000623 SE8700623W WO8804706A1 WO 1988004706 A1 WO1988004706 A1 WO 1988004706A1 SE 8700623 W SE8700623 W SE 8700623W WO 8804706 A1 WO8804706 A1 WO 8804706A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- washing
- pulp
- carbon dioxide
- stage
- filtrate
- Prior art date
Links
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
- D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
- D21C9/02—Washing ; Displacing cooking or pulp-treating liquors contained in the pulp by fluids, e.g. wash water or other pulp-treating agents
Definitions
- a further object of the present invention is to emascu ⁇ late alkaline, cellulosic pulp of sodium ions.
- a third obj ect of the present invention is to increase the washing-out , from alkaline, cell ulosic pulp, of substances which contribute to chemical oxygen demand (COD) .
- the washed pulp departs from the fourth filter 18 at reference numeral 13.
- the filter cake is comminuted by shredders 8.
- Filtrate from one filter is used a washing liquid in the preceding filter and dilution liquid in the same filter. Normally, pure water is added to the last filter 18 as washing liquid, entering through a conduit 12.
- Water is added to the last washing filter 18, this water being admixed with carbon dioxide and/or sulphur dioxide.
- a pH sensor device may also be disposed in the conduit 28.
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Paper (AREA)
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT88900488T ATE67536T1 (de) | 1986-12-22 | 1987-12-21 | Verfahren zum waschen einer alkalischen pulpe. |
BR8707606A BR8707606A (pt) | 1986-12-22 | 1987-12-21 | Processo para lavagem de polpa alcalina |
JP50116588A JPH0778315B2 (ja) | 1986-12-22 | 1987-12-21 | アルカリ法パルプの洗浄方法 |
FI883851A FI90256C (fi) | 1986-12-22 | 1988-08-19 | Menetelmä emäksisen massan pesemiseksi |
NO883736A NO172550C (no) | 1986-12-22 | 1988-08-19 | Fremgangsmåte ved vasking av alkalisk cellulosemasse |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE8605510A SE8605510L (sv) | 1986-12-22 | 1986-12-22 | Sett vid tvettning av massa |
SE8605510-0 | 1986-12-22 | ||
SEPCT/SE87/00198 | 1987-04-16 | ||
PCT/SE1987/000198 WO1988004705A1 (en) | 1986-12-22 | 1987-04-16 | Method for washing of alcaline pulp |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1988004706A1 true WO1988004706A1 (en) | 1988-06-30 |
Family
ID=26659637
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/SE1987/000623 WO1988004706A1 (en) | 1986-12-22 | 1987-12-21 | Method for washing of alcaline pulp |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0296198B1 (el) |
DE (1) | DE3773204D1 (el) |
WO (1) | WO1988004706A1 (el) |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5401362A (en) * | 1993-03-24 | 1995-03-28 | Kamyr, Inc. | Control of metals and dissolved organics in the bleach plant |
US5509999A (en) * | 1993-03-24 | 1996-04-23 | Kamyr, Inc. | Treatment of bleach plant effluents |
WO1999045202A1 (en) * | 1998-03-03 | 1999-09-10 | Aga Aktiebolag | Improved papermaking processes |
US6059925A (en) * | 1994-11-14 | 2000-05-09 | Aga Aktiebolag | Method to regenerate gas mixture in ozone-bleaching process |
US6126782A (en) * | 1993-12-15 | 2000-10-03 | Mo Och Domsjo Aktiebolag | Method for non-chlorine bleaching of cellulose pulp with a totally closed counter-current liquid circuit |
US6258208B1 (en) | 1994-04-05 | 2001-07-10 | Mo Och Domsjo Aktiebolag | Method for complex treatment of pulp in conjunction with a chlorine dioxide stage |
WO2001083886A1 (en) * | 2000-05-04 | 2001-11-08 | Aga Aktiebolag | A process for controlling microbial growth |
WO2008028960A1 (en) * | 2006-09-08 | 2008-03-13 | Linde Aktiengesellschaft | Process for the deresination of pulp and use of carbon dioxide or (bi)carbonate therefor |
WO2009003770A1 (en) * | 2007-07-03 | 2009-01-08 | Linde Aktiengesellschaft | Process for making paper and use of an acid/base treatment in papermaking |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FI991241A (fi) | 1999-06-01 | 2000-12-02 | Aga Ab | Ligniinin valkaisu ja menetelmä paperin valmistamiseksi |
US7056419B2 (en) | 2002-09-30 | 2006-06-06 | American Air Liquide, Inc. | Methods for modifying electrical properties of papermaking compositions using carbon dioxide |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4042452A (en) * | 1974-09-03 | 1977-08-16 | A. Ahlstrom Osakeyhtio | Process for washing cellulose pulp from alkali digestion wherein acid is added to the washing solution |
-
1987
- 1987-12-21 EP EP19880900488 patent/EP0296198B1/en not_active Expired
- 1987-12-21 WO PCT/SE1987/000623 patent/WO1988004706A1/en active IP Right Grant
- 1987-12-21 DE DE88900488T patent/DE3773204D1/de not_active Expired - Fee Related
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4042452A (en) * | 1974-09-03 | 1977-08-16 | A. Ahlstrom Osakeyhtio | Process for washing cellulose pulp from alkali digestion wherein acid is added to the washing solution |
Non-Patent Citations (2)
Title |
---|
DERWENT'S ABSTRACT No 1980-18030C & SU,A,670 625 * |
DERWENT'S ABSTRACT No 1980-91532C & SU,A,730 913 * |
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5401362A (en) * | 1993-03-24 | 1995-03-28 | Kamyr, Inc. | Control of metals and dissolved organics in the bleach plant |
US5509999A (en) * | 1993-03-24 | 1996-04-23 | Kamyr, Inc. | Treatment of bleach plant effluents |
US6126782A (en) * | 1993-12-15 | 2000-10-03 | Mo Och Domsjo Aktiebolag | Method for non-chlorine bleaching of cellulose pulp with a totally closed counter-current liquid circuit |
US6258208B1 (en) | 1994-04-05 | 2001-07-10 | Mo Och Domsjo Aktiebolag | Method for complex treatment of pulp in conjunction with a chlorine dioxide stage |
US6059925A (en) * | 1994-11-14 | 2000-05-09 | Aga Aktiebolag | Method to regenerate gas mixture in ozone-bleaching process |
WO1999045202A1 (en) * | 1998-03-03 | 1999-09-10 | Aga Aktiebolag | Improved papermaking processes |
AU744905B2 (en) * | 1998-03-03 | 2002-03-07 | Aga Aktiebolag | Improved papermaking processes |
WO2001083886A1 (en) * | 2000-05-04 | 2001-11-08 | Aga Aktiebolag | A process for controlling microbial growth |
WO2008028960A1 (en) * | 2006-09-08 | 2008-03-13 | Linde Aktiengesellschaft | Process for the deresination of pulp and use of carbon dioxide or (bi)carbonate therefor |
WO2009003770A1 (en) * | 2007-07-03 | 2009-01-08 | Linde Aktiengesellschaft | Process for making paper and use of an acid/base treatment in papermaking |
Also Published As
Publication number | Publication date |
---|---|
EP0296198B1 (en) | 1991-09-18 |
EP0296198A1 (en) | 1988-12-28 |
DE3773204D1 (el) | 1991-10-24 |
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