DE30978C - Process for bleaching mechanically produced pulp for paper manufacture - Google Patents
Process for bleaching mechanically produced pulp for paper manufactureInfo
- Publication number
- DE30978C DE30978C DENDAT30978D DE30978DA DE30978C DE 30978 C DE30978 C DE 30978C DE NDAT30978 D DENDAT30978 D DE NDAT30978D DE 30978D A DE30978D A DE 30978DA DE 30978 C DE30978 C DE 30978C
- Authority
- DE
- Germany
- Prior art keywords
- carbon disulfide
- paper manufacture
- mechanically produced
- produced pulp
- bleaching
- 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 - Lifetime
Links
- 238000000034 method Methods 0.000 title description 2
- 238000004061 bleaching Methods 0.000 title 1
- 238000004519 manufacturing process Methods 0.000 title 1
- QGJOPFRUJISHPQ-UHFFFAOYSA-N carbon bisulphide Chemical compound S=C=S QGJOPFRUJISHPQ-UHFFFAOYSA-N 0.000 claims description 22
- 238000000605 extraction Methods 0.000 claims description 5
- 239000000975 dye Substances 0.000 claims description 4
- 229920005989 resin Polymers 0.000 claims description 4
- 239000011347 resin Substances 0.000 claims description 4
- 239000002253 acid Substances 0.000 claims description 3
- 230000002378 acidificating Effects 0.000 claims 1
- 150000007513 acids Chemical class 0.000 claims 1
- 238000004090 dissolution Methods 0.000 claims 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 238000001704 evaporation Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000004568 cement Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000000875 corresponding Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- LSNNMFCWUKXFEE-UHFFFAOYSA-N sulfonic acid Chemical compound OS(O)=O LSNNMFCWUKXFEE-UHFFFAOYSA-N 0.000 description 1
- 239000002023 wood Substances 0.000 description 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
- 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
- D21C9/1026—Other features in bleaching processes
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Paper (AREA)
Description
Nachdem die betreffende Masse durch Schleifen oder Kollern oder ein hiermit ähnliches Verfahren in seine Fasern zerrissen ist, was immer mit reichlichem Wasserzusatz geschieht, wird solche in Centrifugen ausgeschleudert und, wenn nöthig, noch weiter5 getrocknet, wobei man dieselbe auf einem Transporteur durch eine Trockenkammer ziehen kann.After the mass in question by grinding or mulling or an hereby similar method is torn in its fibers, whatever happens with ample addition of water, such is centrifuged in centrifuges and, if necessary, further dried for 5 to give the same on a conveyor through a drying chamber can pull.
Nachdem die Masse getrocknet ist, kommt dieselbe in einen Kocher, welcher behufs abwechselnder Erwärmung oder Abkühlung in einem Bassin von Cement, Holz oder Eisen steht, durch welches heifses oder kaltes Wasser geleitet werden kann. 'After the mass has dried, it is put into a cooker, which is used alternately Heating or cooling in a basin made of cement, wood or iron indicates through which hot or cold water can be passed. '
In einem entsprechenden Apparat wird nun eine gasförmige Säure erzeugt, während in einem zweiten Schwefelkohlenstoff verdampft wird. Die Säure wird im Verhältnifs von 2 bis 3 pCt. zum Schwefelkohlenstoff genommen, und werden beide Gase in den Kocher eingeführt. .In a corresponding device is now a gaseous acid is generated while in a second carbon disulfide evaporates will. The acid is in a ratio of 2 to 3 pCt. taken to carbon disulfide, and both gases are introduced into the cooker. .
Am einfachsten ist es, hierzu schweflige Säure zu nehmen, welche man bei den kleinen Quantitäten, welche zur Verwendung kommen, fertig kaufen kann.The easiest way to do this is to use sulphurous acid, which is common with the small ones Quantities that are used can be bought ready-made.
Während dieser Einleitung und bis zur vollständigen Lösung der Harze und Farbstoffe durch den Schwefelkohlenstoff, was je nach dem Material 2 bis 4 Stunden dauern kann, wird der Kocher von heifsem Wasser umspült und auf diese Weise auf etwa 2 Atmosphären Druck gehalten, die ca. 55°.C. entsprechen.During this introduction and until the resins and dyes have completely dissolved through the carbon disulfide, which can take 2 to 4 hours depending on the material, the stove is washed around by hot water and in this way to about 2 atmospheres Pressure kept that approx. 55 ° .C. correspond.
Nachdem die Lösung beendet ist, beginnt die Extraction. Während der Kocher jetzt von kaltem Wasser umspült wird, wodurch sich der Schwefelkohlenstoff in demselben condensirt, um den Stoff -zu durchdringen und die Harze und Farbstoffe zu extrahiren, wird beständig frischer, gasförmiger Schwefelkohlenstoff zugesetzt. ' : After the solution is finished, the extraction begins. While the cooker is now bathed in cold water, whereby the carbon disulfide condenses in it, in order to penetrate the substance and to extract the resins and dyes, fresh, gaseous carbon disulfide is constantly added. ' :
Hierbei fliefst der aus dem Kocher ablaufende Schwefelkohlenstoff immer wieder in das Verdampfungsgefäfs zurück, um von neuem wieder verdampft zu werden.The carbon disulfide flowing out of the cooker flows into the stove again and again the evaporation vessel back to be evaporated again.
Nach und nach sammelt sich hierbei das Extractionsproduct in dem Schwefelkohlenstoffverdampfungsapparat. The extraction product gradually collects in the carbon disulfide vaporiser.
Ist die Extraction vollendet, so gewinnt man den noch in der Masse vorhandenen Schwefelkohlenstoff dadurch^ dafs man den Kocher erhitzt und ersteren in einer gekühlten Rohrschlange condensirt oder in einen zweiten Kocher leitet, in welchem dasselbe Verfahren gemacht wird.When the extraction is completed, the carbon disulfide still present in the mass is obtained by heating the stove and the former in a cooled pipe coil condenses or passes into a second digester, in which the same process is made.
Nach geschehener Extraction und Abdampfung des Schwefelkohlenstoffes ist der Stoff zur Weiterverwendung gebleicht.After extraction and evaporation of the carbon disulfide, the substance is ready for use Re-use bleached.
Man wird gut thun, das Apparatsystem doppelt einzurichten, wobei man von Zeit zu Zeit.einen Schwefelkohlenstoffapparat ganz abdampft, um die darin gesammelten Harze und Farbstoffe entfernen zu können.One would do well to set up the apparatus system twice, and from time to time one would do Time. A carbon disulfide apparatus evaporates completely in order to remove the resins and To be able to remove dyes.
Claims (1)
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE30978C true DE30978C (en) |
Family
ID=307078
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DENDAT30978D Expired - Lifetime DE30978C (en) | Process for bleaching mechanically produced pulp for paper manufacture |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE30978C (en) |
-
0
- DE DENDAT30978D patent/DE30978C/en not_active Expired - Lifetime
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