WO1988006202A1 - An improved peroxide bleaching method - Google Patents
An improved peroxide bleaching method Download PDFInfo
- Publication number
- WO1988006202A1 WO1988006202A1 PCT/SE1988/000055 SE8800055W WO8806202A1 WO 1988006202 A1 WO1988006202 A1 WO 1988006202A1 SE 8800055 W SE8800055 W SE 8800055W WO 8806202 A1 WO8806202 A1 WO 8806202A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- acid
- pulp
- bleaching
- suspension
- peroxide
- 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
- D21C9/10—Bleaching ; Apparatus therefor
- D21C9/16—Bleaching ; Apparatus therefor with per compounds
- D21C9/163—Bleaching ; Apparatus therefor with per compounds with peroxides
Definitions
- Combinations of hydrogen peroxide with certain organic acids stand out as an especially efficient form of the peroxide bleaching technique.
- the treatment is carried out within the acid range of the pH-scale, facilitating the formation of peroxyacid ⁇ which are the active chemical species in the bleaching process.
- the common way, of bleaching with peroxides is carried out using slightly alkaline conditions enhancing the formation of peroxide anions HC which are the active ionic species. Higher alkalinities are to be avoided since hydrogen peroxide then decomposes to oxygen.
- the purpose of the present disclosure is to describe a simple method to enhance the bleaching efficiency of hydrogen peroxide by adding certain inexpensive organic acids to the bleaching solution.
- the acids in question are formic, acetic, lactic, maleic acid and phtalic acid; they can be used separately or in various combinations. Contrary to similar mixtures of hydrogen peroxide with such acids which have been proposed to increase the efficiency of the bleaching process, cf. for instance Austrian Patent 203.454, the mixtures of the present disclosure are being used within the alkaline range of the pH-scale and not on its acid side.
- This alkalinity of the treating solution is the main characteristic feature of the present invention relating to peroxide bleaching process in the presence of the organic acids enumerated above, i.e. formic, acetic, lactic, maleic acid and phtalic acid or mixtures thereof.
- the bleaching efficiency of peroxides can be improved if the bleaching process is carried out in the presence of low concentrations of one or more of the enumerated acids while maintaining the pH-value within the alkaline range 8-13, which pH-range is provided by the addition of an alkali metal hydroxide, such as sodium hydroxide or potassium hydroxide.
- an alkali metal hydroxide such as sodium hydroxide or potassium hydroxide.
- potassium hydroxide gives a significantly higher brightness of the bleached material than does sodium hydroxide. The difference amounted to 2-8 SCAN brightness units.
- Example 1 The invention is illustrated by means of the following examples.
- Example 1 The invention is illustrated by means of the following examples.
- a bleaching mixture containing 4% H ? 0 2 , 1% acetic acid, and 1% formic acid (based on the weight of the quantity of pulp present in the system) gave after bleaching carried out as described above a brightness of 78%, the brightness gain being 18 units.
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE8888901957T DE3876429T2 (en) | 1987-02-12 | 1988-02-12 | PEROXIDE BLEACHING METHOD. |
AT88901957T ATE83016T1 (en) | 1987-02-12 | 1988-02-12 | PEROXIDE BLEACHING PROCESS. |
FI893742A FI91545C (en) | 1987-02-12 | 1989-08-08 | Improved peroxide bleaching process |
CA000612006A CA1333650C (en) | 1987-02-12 | 1989-09-19 | Peroxide bleaching method |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE8700569-0 | 1987-02-12 | ||
SE8700569A SE8700569D0 (en) | 1987-02-12 | 1987-02-12 | AN IMPROVED PEROXIDE BLEACHING METHOD |
CA000612006A CA1333650C (en) | 1987-02-12 | 1989-09-19 | Peroxide bleaching method |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1988006202A1 true WO1988006202A1 (en) | 1988-08-25 |
Family
ID=25673050
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/SE1988/000055 WO1988006202A1 (en) | 1987-02-12 | 1988-02-12 | An improved peroxide bleaching method |
Country Status (7)
Country | Link |
---|---|
EP (1) | EP0348411B1 (en) |
AT (1) | ATE83016T1 (en) |
CA (1) | CA1333650C (en) |
DE (1) | DE3876429T2 (en) |
FI (1) | FI91545C (en) |
SE (1) | SE8700569D0 (en) |
WO (1) | WO1988006202A1 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19516151A1 (en) * | 1995-05-03 | 1996-11-07 | Sven Siegle | Process for the production of a pulp from cellulosic material, the pulp itself and its use |
WO1997030210A1 (en) * | 1996-02-19 | 1997-08-21 | Kemira Chemicals Oy | Process for bleaching of a high yield pulp |
WO1997030207A1 (en) * | 1996-02-19 | 1997-08-21 | Kemira Chemicals Oy | Process for bleaching of chemical pulp |
US5885412A (en) * | 1993-12-23 | 1999-03-23 | Bim Kemi Ab | Inhibition of hydrogen peroxide decomposing enzymes during bleaching of cellulose fibers |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NO109292C (en) * | 1962-07-16 | |||
DE2219505B2 (en) * | 1972-04-21 | 1974-03-07 | Deutsche Gold- Und Silber-Scheideanstalt Vormals Roessler, 6000 Frankfurt | Chlorine-free multi-stage bleaching of cellulose |
-
1987
- 1987-02-12 SE SE8700569A patent/SE8700569D0/en unknown
-
1988
- 1988-02-12 AT AT88901957T patent/ATE83016T1/en not_active IP Right Cessation
- 1988-02-12 DE DE8888901957T patent/DE3876429T2/en not_active Expired - Fee Related
- 1988-02-12 EP EP88901957A patent/EP0348411B1/en not_active Expired
- 1988-02-12 WO PCT/SE1988/000055 patent/WO1988006202A1/en active IP Right Grant
-
1989
- 1989-08-08 FI FI893742A patent/FI91545C/en not_active IP Right Cessation
- 1989-09-19 CA CA000612006A patent/CA1333650C/en not_active Expired - Fee Related
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NO109292C (en) * | 1962-07-16 | |||
DE2219505B2 (en) * | 1972-04-21 | 1974-03-07 | Deutsche Gold- Und Silber-Scheideanstalt Vormals Roessler, 6000 Frankfurt | Chlorine-free multi-stage bleaching of cellulose |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5885412A (en) * | 1993-12-23 | 1999-03-23 | Bim Kemi Ab | Inhibition of hydrogen peroxide decomposing enzymes during bleaching of cellulose fibers |
DE19516151A1 (en) * | 1995-05-03 | 1996-11-07 | Sven Siegle | Process for the production of a pulp from cellulosic material, the pulp itself and its use |
WO1997030210A1 (en) * | 1996-02-19 | 1997-08-21 | Kemira Chemicals Oy | Process for bleaching of a high yield pulp |
WO1997030207A1 (en) * | 1996-02-19 | 1997-08-21 | Kemira Chemicals Oy | Process for bleaching of chemical pulp |
Also Published As
Publication number | Publication date |
---|---|
EP0348411A1 (en) | 1990-01-03 |
DE3876429D1 (en) | 1993-01-14 |
DE3876429T2 (en) | 1993-07-01 |
FI91545C (en) | 1994-07-11 |
FI893742A0 (en) | 1989-08-08 |
CA1333650C (en) | 1994-12-27 |
ATE83016T1 (en) | 1992-12-15 |
FI91545B (en) | 1994-03-31 |
SE8700569D0 (en) | 1987-02-12 |
EP0348411B1 (en) | 1992-12-02 |
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