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.)
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
Verfahren zur Erzeugung von Spinnfaser und Zellstoff aus schwach verholzten, stark basthaltigen Rohpflanzen, wie Leinstroh, Sisal, Jute usw., unter Anwendung saurer Sulfitlaugen
Verfahren zur Erhoehung der Anfaerbbarkeit von Faeden, Fasern oder Erzeugnissen hieraus aus Polyacrylnitril oder dieses enthaltenden Mischpolymerisaten