GB885605A - Improved method for the production of neutral sulfite pulp - Google Patents
Improved method for the production of neutral sulfite pulpInfo
- Publication number
- GB885605A GB885605A GB30329/59A GB3032959A GB885605A GB 885605 A GB885605 A GB 885605A GB 30329/59 A GB30329/59 A GB 30329/59A GB 3032959 A GB3032959 A GB 3032959A GB 885605 A GB885605 A GB 885605A
- Authority
- GB
- United Kingdom
- Prior art keywords
- pulp
- impregnation
- liquor
- minutes
- chips
- 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
- 238000000034 method Methods 0.000 title abstract 2
- 230000007935 neutral effect Effects 0.000 title abstract 2
- LSNNMFCWUKXFEE-UHFFFAOYSA-N Sulfurous acid Chemical compound OS(O)=O LSNNMFCWUKXFEE-UHFFFAOYSA-N 0.000 title 1
- 238000005470 impregnation Methods 0.000 abstract 6
- GEHJYWRUCIMESM-UHFFFAOYSA-L sodium sulfite Chemical compound [Na+].[Na+].[O-]S([O-])=O GEHJYWRUCIMESM-UHFFFAOYSA-L 0.000 abstract 2
- 239000000126 substance Substances 0.000 abstract 2
- 239000002023 wood Substances 0.000 abstract 2
- LSNNMFCWUKXFEE-UHFFFAOYSA-M Bisulfite Chemical compound OS([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-M 0.000 abstract 1
- 239000007864 aqueous solution Substances 0.000 abstract 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-N carbonic acid Chemical compound OC(O)=O BVKZGUZCCUSVTD-UHFFFAOYSA-N 0.000 abstract 1
- 239000012895 dilution Substances 0.000 abstract 1
- 238000010790 dilution Methods 0.000 abstract 1
- 235000010267 sodium hydrogen sulphite Nutrition 0.000 abstract 1
- 239000004289 sodium hydrogen sulphite Substances 0.000 abstract 1
- 235000010265 sodium sulphite Nutrition 0.000 abstract 1
- 239000000243 solution Substances 0.000 abstract 1
- 238000010025 steaming Methods 0.000 abstract 1
- LSNNMFCWUKXFEE-UHFFFAOYSA-L sulfite Chemical compound [O-]S([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-L 0.000 abstract 1
- 239000002699 waste material Substances 0.000 abstract 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract 1
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
- D21C3/04—Pulping cellulose-containing materials with acids, acid salts or acid anhydrides
- D21C3/06—Pulping cellulose-containing materials with acids, acid salts or acid anhydrides sulfur dioxide; sulfurous acid; bisulfites sulfites
Landscapes
- Paper (AREA)
Abstract
Semi-chemical neutral sulphite pulp is made by first steaming wood chips, then impregnating them with an aqueous solution of sodium sulphite and bisulphite which has a pH value of 9,5-6 and which contains no free or combined carbonic acid, removing the excess impregnating solution, digesting the pulp without any free liquor at 165-175 DEG C. and subsequently mechanically defibrating the pulp. During the impregnation period the temperature is preferably kept below 110 DEG C., suitably at about 100 DEG C. or lower. The duration of the impregnation is preferably at least 30 minutes and more preferably 60-120 minutes. The impregnation of the steamed wood chips may be effected by compressing them and then, while they are still under pressure, introducing them into the impregnation liquor, the chips being allowed to expand in the impregnation liquor by releasing the pressure while they are immersed in the liquor, and the chips being left in the impregnation liquor for at least 3 minutes, preferably more than 10 minutes. After the defibration step, without appreciable dilution with water, the pulp may be pressed to a dry content of at least 40%. Prior to this pressing the pulp may be diluted with waste liquor obtained by pressing a previous batch of pulp. The process enables pulps of exceptional brightness to be obtained with a relatively low consumption of chemicals.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE865658 | 1958-09-11 | ||
| SE768259 | 1959-08-18 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB885605A true GB885605A (en) | 1961-12-28 |
Family
ID=26654793
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB30329/59A Expired GB885605A (en) | 1958-09-11 | 1959-09-04 | Improved method for the production of neutral sulfite pulp |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US3078208A (en) |
| BE (1) | BE582569A (en) |
| CH (1) | CH379256A (en) |
| DE (1) | DE1262754B (en) |
| FI (1) | FI40601B (en) |
| FR (1) | FR1236223A (en) |
| GB (1) | GB885605A (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3383277A (en) * | 1967-02-06 | 1968-05-14 | Scott Paper Co | Two-stage pulping process with an isothermal first stage |
| US3533906A (en) * | 1967-10-11 | 1970-10-13 | Haigh M Reiniger | Permanently reacted lignocellulose products and process for making the same |
| SE355614B (en) * | 1970-05-13 | 1973-04-30 | Mo Och Domsjoe Ab | |
| US4116758A (en) * | 1976-05-14 | 1978-09-26 | Canadian International Paper Co. | Method of producing high yield chemimechanical pulps |
| DE102007008955A1 (en) * | 2007-02-21 | 2008-08-28 | Voith Patent Gmbh | Producing fibrous material from lignocellulosic material comprises preparing a chemical solution with less percentage of sulfite, mixing the solution with wood, heating, removing the solution, pulping and separating the woods and solution |
| EP2029806A2 (en) * | 2006-06-08 | 2009-03-04 | Voith Patent GmbH | Method for producing fibrous material |
| JP2010514946A (en) * | 2006-12-23 | 2010-05-06 | フォイト パテント ゲゼルシャフト ミット ベシュレンクテル ハフツング | Tissue paper manufacturing method |
| DE102007036382A1 (en) * | 2007-07-31 | 2009-02-05 | Voith Patent Gmbh | Lignocellulosic pulp from annual plants |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US215728A (en) * | 1879-05-27 | Improvement in the manufacture of paper-pulp from wood | ||
| US2862813A (en) * | 1952-12-23 | 1958-12-02 | Process Evaluation Devel | Semi-chemical pulping process |
| US2640774A (en) * | 1953-01-27 | 1953-06-02 | Pulp And Papen Res Inst Of Can | Production of cellulose pulp |
| US2809111A (en) * | 1956-02-13 | 1957-10-08 | Condi Engineering Corp | Apparatus for wood chip digestion |
| US2858213A (en) * | 1956-04-20 | 1958-10-28 | Condi Engineering Corp | Wood chip digestion |
| US2975096A (en) * | 1957-11-18 | 1961-03-14 | Bauer Bros Co | Impregnation of wood chips |
-
1959
- 1959-09-04 GB GB30329/59A patent/GB885605A/en not_active Expired
- 1959-09-05 DE DEST15539A patent/DE1262754B/en active Pending
- 1959-09-07 FI FI1418/59A patent/FI40601B/fi active
- 1959-09-09 FR FR804738A patent/FR1236223A/en not_active Expired
- 1959-09-10 US US839071A patent/US3078208A/en not_active Expired - Lifetime
- 1959-09-11 CH CH7811759A patent/CH379256A/en unknown
- 1959-09-11 BE BE582569A patent/BE582569A/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| CH379256A (en) | 1964-06-30 |
| FR1236223A (en) | 1960-07-15 |
| DE1262754B (en) | 1968-03-07 |
| BE582569A (en) | 1959-12-31 |
| US3078208A (en) | 1963-02-19 |
| FI40601B (en) | 1968-11-30 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US2749241A (en) | Process for producing semi-chemical pulp | |
| GB885605A (en) | Improved method for the production of neutral sulfite pulp | |
| GB283910A (en) | Improved process for the extraction of cellulose or paper pulp from fibrous vegetable matter containing the same | |
| US1859847A (en) | Pulped material and process of preparing the same | |
| US1979341A (en) | Process for preparing cellulose | |
| US1842712A (en) | Manufacture of wood pulp, etc. | |
| US1859845A (en) | Treatment of wood for the production of pulp | |
| SU406992A1 (en) | ||
| US1880044A (en) | Process of alkaline fiber liberation | |
| SE8503618D0 (en) | PROCEDURE FOR PREPARING CELLULOSA WITH BATCH COOKING | |
| US2610119A (en) | Defibering presoaked ligno-cellulose | |
| US1931575A (en) | Method of manufacturing cellulose | |
| US1974751A (en) | Chemical pulping process | |
| US3210237A (en) | Bisulphite pulping of pine wood | |
| US2190193A (en) | Chemical wood-pulping process | |
| US1848602A (en) | And edward p | |
| NO115408B (en) | ||
| US1848662A (en) | of berlin | |
| SU376507A1 (en) | METHOD FOR GETTING SULPHITE PULP | |
| US2799580A (en) | Process for the disincrustation of fibrous vegetable materials | |
| US1611969A (en) | Process for producing high-grade half stuff | |
| US1935579A (en) | Two-step chemical process of fiber liberation | |
| SU520430A1 (en) | Pulp Production Method | |
| US1867593A (en) | Process of chemical fiber liberation | |
| US1824701A (en) | Treatment of woods for cellulose |