GB1119546A - Improved method of treating fibrous material - Google Patents
Improved method of treating fibrous materialInfo
- Publication number
- GB1119546A GB1119546A GB861566A GB861566A GB1119546A GB 1119546 A GB1119546 A GB 1119546A GB 861566 A GB861566 A GB 861566A GB 861566 A GB861566 A GB 861566A GB 1119546 A GB1119546 A GB 1119546A
- Authority
- GB
- United Kingdom
- Prior art keywords
- fibrous material
- clo2
- squeezing
- pretreatment
- reaction
- 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.)
- Expired
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
- D21C3/00—Pulping cellulose-containing materials
- D21C3/003—Pulping cellulose-containing materials with organic compounds
-
- 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
- D21C3/00—Pulping cellulose-containing materials
- D21C3/22—Other features of pulping processes
- D21C3/26—Multistage processes
Landscapes
- Paper (AREA)
- Compounds Of Unknown Constitution (AREA)
Abstract
Lignin is removed from fibrous material by contact with ClO2 or precursor thereof (e.g. NaClO3 or NaClO2), peracetic, performic or perpropionic acid at a pH of 2.5-4.0, and terminating the reaction before the residual lignin content is reduced below 2% wt. Substantial removal of carbohydrate does not occur. The reaction may be conducted at 40-70 DEG C. The ClO2 may be used as a saturated aq. solution. When peracetic acid is used sodium acetate or NH4+ may be present. Before delignification the raw fibrous material may be subjected to laceration, extraction, mild alkaline pretreatment e.g. with NaOH and a squeezing pretreatment between surfaces moving at different speeds. This squeezing may be followed by washing. The delignified material may be contacted with an additional amount of one of the above compounds. The delignified material can be defibrered e.g. under mild alkaline conditions. The fibrous material may be wood, straw, grass, pulp, bast, flax, pulp board, waste paper or newsprint.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US43579665A | 1965-03-01 | 1965-03-01 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1119546A true GB1119546A (en) | 1968-07-10 |
Family
ID=23729838
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB861566A Expired GB1119546A (en) | 1965-03-01 | 1966-02-28 | Improved method of treating fibrous material |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JPS5417041B1 (en) |
| DE (1) | DE1692855A1 (en) |
| FI (1) | FI48366B (en) |
| GB (1) | GB1119546A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4548674A (en) * | 1983-08-08 | 1985-10-22 | Interox (Societe Anonyme) | Process for the regeneration of waste paper |
| WO2000077301A1 (en) * | 1999-06-15 | 2000-12-21 | Kemira Chemicals Oy | Method to improve the opacity of mechanical pulp by using aliphatic peroxyacids and use of peroxyacids to improve opacity |
| EP1389646A1 (en) * | 2002-07-19 | 2004-02-18 | Crosmill Ltd | Process for making paper |
| ITTO20090351A1 (en) * | 2009-05-04 | 2010-11-05 | Univ Pisa | PROCEDURE FOR THE PRODUCTION OF POLYURETHANE / POLYUREIC FOAMS FROM LIGNINA-BASED MATERIALS |
-
1966
- 1966-02-28 GB GB861566A patent/GB1119546A/en not_active Expired
- 1966-03-01 JP JP1203566A patent/JPS5417041B1/ja active Pending
- 1966-03-01 FI FI51466A patent/FI48366B/fi active
- 1966-03-01 DE DE19661692855 patent/DE1692855A1/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4548674A (en) * | 1983-08-08 | 1985-10-22 | Interox (Societe Anonyme) | Process for the regeneration of waste paper |
| WO2000077301A1 (en) * | 1999-06-15 | 2000-12-21 | Kemira Chemicals Oy | Method to improve the opacity of mechanical pulp by using aliphatic peroxyacids and use of peroxyacids to improve opacity |
| EP1389646A1 (en) * | 2002-07-19 | 2004-02-18 | Crosmill Ltd | Process for making paper |
| ITTO20090351A1 (en) * | 2009-05-04 | 2010-11-05 | Univ Pisa | PROCEDURE FOR THE PRODUCTION OF POLYURETHANE / POLYUREIC FOAMS FROM LIGNINA-BASED MATERIALS |
Also Published As
| Publication number | Publication date |
|---|---|
| DE1692855A1 (en) | 1971-10-21 |
| JPS5417041B1 (en) | 1979-06-27 |
| FI48366B (en) | 1974-05-31 |
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