Global Patent Index - EP 0325890 A1

EP 0325890 A1 19890802 - Process for treating lignin containing cellulose pulp with ozone.

Title (en)

Process for treating lignin containing cellulose pulp with ozone.

Title (de)

Verfahren zur Behandlung von Lignin enthaltender Cellulosemasse mit Ozon.

Title (fr)

Procédé de traitement d'une pâte cellulosique contenant de la lignine par l'ozone.

Publication

EP 0325890 A1 19890802 (DE)

Application

EP 88810034 A 19880125

Priority

EP 88810034 A 19880125

Abstract (en)

To separate lignin from cellulose material, the latter is exposed to the action of ozone in the gaseous phase in the presence of at least one C1-3-fatty acid, particularly acetic acid, in order to render the lignin contained in the cellulose material more soluble in the fatty acid by oxidative conversion.

Abstract (de)

Zur Abtrennung von Lignin aus Cellulosemasse wird diese in Gegenwart mindestens einer C1-3-Fettsäure, insbesondere Essigsäure, der Einwirkung von Ozon in der Gasphase ausgesetzt, um das in der Cellulosemasse enthaltene Lignin durch oxidative Umwandlung in der Fettsäure löslicher zu machen.

IPC 1-7

D21C 9/153; D21C 9/16

IPC 8 full level

D21C 9/153 (2006.01); D21C 9/16 (2006.01)

CPC (source: EP US)

D21C 9/153 (2013.01 - EP US); D21C 9/163 (2013.01 - EP US)

Citation (search report)

  • [X] US 4119486 A 19781010 - ECKERT ROBERT C
  • [A] US 4372812 A 19830208 - PHILLIPS RICHARD B, et al
  • [A] FR 2353674 A1 19771230 - INT PAPER CO [US]
  • [AD] DE 3445132 A1 19860612 - NIMZ HORST H PROF DR [DE]
  • [X] ABSTRACT BULLETIN OF THE INSTITUTE OF PAPER CHEMISTRY, Band 53, Nr. 8, Februar 1983, Seite 916, Zusammenfassung Nr. 8417, Appleton, Wisconsin, US; H. KAMISHIMA et al.: "Effect of organic acids on carbohydrate protection during ozone bleaching of kraft pulp", & J. JAPAN WOOD RES. SOC. (MOKUZAI GAKKAISHI) 28, no. 6; 370-375 (June 1982)
  • [X] CHEMICAL ABSTRACTS, Band 103, Nr. 6, 12. August 1985, Seite 88, Zusammenfassung Nr. 38887c, Columbus, Ohio, US; H. KAMISHIMA et al.: "Protective agents for carbohydrates in ozone bleaching of unbleached kraft pulps. II. Screening of protective agents for carbohydrates in ozone bleaching", & SHIKOKU KOGYO GIJUTSU SHIKENSHO KENKYU HOKOKU 1985, (9), 15-30
  • [X] ABSTRACT BULLETIN OF THE INSTITUTE OF PAPER CHEMISTRY, Band 47, Nr. 6, Dezember 1976, Seite 686, Zusammenfassung Nr. 6669, Appleton, Wisconsin, US; & SU-A-518 544 (B.V. EMEL'YANOV et al.) 25-06-1976
  • [X] ABSTRACT BULLETIN OF THE INSTITUTE OF PAPER CHEMISTRY, Band 54, Nr. 6, Dezember 1983, Seite 672, Zusammenfassung Nr. 6233, Appleton Wisconsin, US; A. KASSEBI et al.: "Nonconventional kraft pulp bleaching - Role of ozone", & TAPPI PULPING CONF. (TORONTO) PROC.: 327-340 (Oct. 25-27, 1982)
  • [X] ABSTRACT BULLETIN OF THE INSTITUTE OF PAPER CHEMISTRY, Band 55, Nr. 8, Februar 1985, Seite 937, Zusammenfassung Nr. 8883, Appleton, Wisconsin, US; G.Y. PAN et al.: "Studies on ozone bleaching. (1). Effect of pH, temperature buffer systems and heavy metal ions on stability of ozone in aqueous solution", & J. WOOD CHEM. TECHNOL. 4, no. 3: 367-387 (1984)
  • [X] ABSTRACT BULLETIN OF THE INSTITUTE OF PAPER CHEMISTRY, Band 53, Nr. 3, September 1982, Seite 331, Zusammenfassung Nr. 2966, Appleton, Wisconsin, US; R.A.D. MBACHU et al.: "Degradation of lignin by ozone. (3). Fate of the carbohydrate matrix during degradation of spruce protolignin by ozone", & J. POLYMER SCI. (POLYMER CHEM.) 19, no. 8, 2079-2089 (Aug. 1981)

Designated contracting state (EPC)

AT BE CH DE ES FR GB GR IT LI LU NL SE

DOCDB simple family (publication)

EP 0325890 A1 19890802; EP 0325890 B1 19930609; AT E90404 T1 19930615; BR 8900299 A 19890919; CA 1319472 C 19930629; DE 3881676 D1 19930715; ES 2041828 T3 19931201; JP H01221587 A 19890905; US 5074960 A 19911224

DOCDB simple family (application)

EP 88810034 A 19880125; AT 88810034 T 19880125; BR 8900299 A 19890125; CA 588913 A 19890123; DE 3881676 T 19880125; ES 88810034 T 19880125; JP 1741489 A 19890125; US 60659590 A 19901031