AT21475B - Process for the production of pulp. - Google Patents
Process for the production of pulp.Info
- Publication number
- AT21475B AT21475B AT21475DA AT21475B AT 21475 B AT21475 B AT 21475B AT 21475D A AT21475D A AT 21475DA AT 21475 B AT21475 B AT 21475B
- Authority
- AT
- Austria
- Prior art keywords
- production
- pulp
- cooking
- cooking liquor
- desc
- Prior art date
Links
- 238000004519 manufacturing process Methods 0.000 title claims description 5
- 238000000034 method Methods 0.000 title claims description 3
- 238000010411 cooking Methods 0.000 claims description 6
- 230000007935 neutral effect Effects 0.000 claims description 3
- PQUCIEFHOVEZAU-UHFFFAOYSA-N Diammonium sulfite Chemical compound [NH4+].[NH4+].[O-]S([O-])=O PQUCIEFHOVEZAU-UHFFFAOYSA-N 0.000 claims 1
- 229910052783 alkali metal Inorganic materials 0.000 claims 1
- -1 alkali metal sulfite Chemical class 0.000 claims 1
- 239000007864 aqueous solution Substances 0.000 claims 1
- 239000002994 raw material Substances 0.000 claims 1
- 239000000243 solution Substances 0.000 claims 1
- 235000013311 vegetables Nutrition 0.000 claims 1
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 5
- LSNNMFCWUKXFEE-UHFFFAOYSA-N Sulfurous acid Chemical compound OS(O)=O LSNNMFCWUKXFEE-UHFFFAOYSA-N 0.000 description 4
- 239000007844 bleaching agent Substances 0.000 description 3
- 241000196324 Embryophyta Species 0.000 description 2
- 239000003513 alkali Substances 0.000 description 2
- 229910021529 ammonia Inorganic materials 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- GEHJYWRUCIMESM-UHFFFAOYSA-L sodium sulfite Chemical compound [Na+].[Na+].[O-]S([O-])=O GEHJYWRUCIMESM-UHFFFAOYSA-L 0.000 description 2
- 239000010902 straw Substances 0.000 description 2
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonium chloride Substances [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 description 1
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 1
- 244000089486 Phragmites australis subsp australis Species 0.000 description 1
- 235000014676 Phragmites communis Nutrition 0.000 description 1
- 235000011114 ammonium hydroxide Nutrition 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 239000011449 brick Substances 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 235000010265 sodium sulphite Nutrition 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Landscapes
- Paper (AREA)
Description
<Desc/Clms Page number 1>
Verfahren zur Herstellung von Zellstoff.
Zur Gewinnung von Zellstoff aus Holz, Stroh, Esparto, Scl) i) frohr usw. wird zumeist eine Kochlauge verwendet, welche freie schweflige Säure enthält. Dies bedingt jedoch eine kostspielige Verbleiung und Ausmauerung der Kocher. Es ist deshalb auch die Verwendung von neutralen Allkalisultiten, und zwar speziell von neutralem Natriumsulfit zur Herstellung der Kochlauge vorgeschlagen worden, doch hat sich ergeben, dass hiebei einesteils Stroh, Schilfrohr und andere rebrartige Pflanzen nur unvollständig aufgeschlossen wurden und t her ein kostspieliges Aussortieren der unaufgeschiossenen Teile erforderlich war, anderer- seits aber ein dunklerer und schwerer bleichbarer Stoff erhalten wurde.
Diese Übelstände, wie auch die Verbleiung oder Ausmauerung der Kocher werden durch Verwendung der den Gegenstand der vorliegenden Erfindung bildenden Kochlauge
EMI1.1
schwefliger Säure hergestellt, deren Gehalt an schwefliger Säure je nach der beabsichtigten Verwendung der Lauge zwischen 1#5-3% schwankt, und in diese Ammoniak bis zur völligen Neutralisation eingeleitet ; umgekehrt kann man auch in wässrige Ammoniaklösung schweflige Säure einleiten.
Mit dieser Lauge werden die aufzuschliessenden Rohpflanzen oder die schwer bleichbaren Faserstoffe in geschlossenen, indirekt heizbaren Kochern mit einem der einzelnen Sorte anzupassenden Druck von 4-10 Atm. und einer Kochdauer von 1 ()-24 Stunden behandelt und in bekannter Weise verarbeitet. Dadurch werden alle
EMI1.2
nach der Kochung schon sehr hell und gut bleichbar und liefern eine schöne, feste, zur PapierfabrikationvorzüglichgeeigneteFaser.
Das benützte Ammoniak kann aus der Lauge fast völlig wiedergewonnen werden.
**WARNUNG** Ende DESC Feld kannt Anfang CLMS uberlappen**.
<Desc / Clms Page number 1>
Process for the production of pulp.
For the production of pulp from wood, straw, esparto, sci) i) f cane, etc., a cooking liquor is mostly used which contains free sulfurous acid. However, this requires expensive leading and brick lining of the cooker. The use of neutral alkali sultites, specifically neutral sodium sulphite, for the production of the cooking liquor has therefore also been suggested, but it has emerged that straw, reeds and other vine-like plants were only incompletely digested and that the unexploited sorting out was costly Parts was required, but on the other hand a darker and more difficult to bleach fabric was obtained.
These inconveniences, as well as the leading or lining of the digesters, are alleviated by using the cooking liquor forming the subject of the present invention
EMI1.1
Sulphurous acid produced, the content of sulphurous acid, depending on the intended use of the alkali fluctuates between 1 # 5-3%, and ammonia is introduced into this until it is completely neutralized; conversely, sulfurous acid can also be introduced into aqueous ammonia solution.
With this lye, the raw plants to be digested or the fibers that are difficult to bleach are placed in closed, indirectly heatable cookers with a pressure of 4-10 atm, which can be adapted to the individual variety. and a cooking time of 1 () -24 hours and processed in a known manner. This will all
EMI1.2
very light-colored after boiling and easy to bleach and provide a beautiful, firm fiber that is excellently suited for making paper.
Almost all of the ammonia used can be recovered from the lye.
** WARNING ** End of DESC field may overlap beginning of CLMS **.
Claims (1)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT21475T | 1903-03-21 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| AT21475B true AT21475B (en) | 1905-09-25 |
Family
ID=3528769
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AT21475D AT21475B (en) | 1903-03-21 | 1903-03-21 | Process for the production of pulp. |
Country Status (1)
| Country | Link |
|---|---|
| AT (1) | AT21475B (en) |
-
1903
- 1903-03-21 AT AT21475D patent/AT21475B/en active
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