Global Patent Index - EP 0172135 A1

EP 0172135 A1 19860219 - Method, process and apparatus for converting wood, wood residue, vegetable fibre and biomass into pulp.

Title (en)

Method, process and apparatus for converting wood, wood residue, vegetable fibre and biomass into pulp.

Title (de)

Weise, Verfahren und Vorrichtung zur Verwandlung von Holz, Holzrückständen, Pflanzenfasern und Biomassen in Pulpe.

Title (fr)

Méthode, procédé et appareil pour la conversion du bois, des résidus de bois, des fibres végétales et de la biomasse en pâte.

Publication

EP 0172135 A1 19860219 (EN)

Application

EP 85810326 A 19850717

Priority

CA 459020 A 19840717

Abstract (en)

Lignocellulosic materials like tree chips, sawmill or vegetable fibres are converted into a high yield pulp in an integrated mill wherein parameters like time intervals, concentration of chemicals in relation to fibre dry weight, and feed rates for the individual steps are predetermined and controlled. The apparatus for carrying out the continuous process comprises means for chemical pretreatment (2) of the lignocellulosic material with sulphonating or oxidating agents and with complexants for metal ions, compression and dewatering (8), pressure steaming (10), decompression (12), non-compulsory washing (14), refining (16) and bleaching (20) of the pulp.

IPC 1-7

D21C 3/22; D21B 1/02

IPC 8 full level

D21B 1/02 (2006.01); D21C 3/22 (2006.01)

CPC (source: EP)

D21B 1/021 (2013.01); D21C 3/228 (2013.01)

Citation (search report)

  • [X] CA 1075857 A 19800422 - PRICE CO LTD
  • [X] FR 2389712 A1 19781201 - MO OCH DOMSJOE AB [SE]
  • [X] US 3684651 A 19720815 - REINHALL ROLF BERTIL
  • [A] US 3822179 A 19740702 - CHARI N, et al
  • [A] US 3012927 A 19611212 - POLLEYS RICHARD W
  • [A] ABSTRACT BULLETIN OF THE INSTITUTE OF PAPER CHEMISTRY, vol. 54, no. 3, September 1983, page 298, no. 2711, Appleton, Wisconsin, US; R.DESHAYE et al.: "Nonlinear mathematical model studies of vapor-phase ultra-high yield sulfite pulping results" & CPPA ANN. MTG. (MONTREAL) PREPRINTS 69A: 7-10(FEB 1-2,1983)
  • [A] JOURNAL OF THE TECHNICAL ASSOCIATION OF THE PULP AND PAPER INDUSTRY, vol. 64, no. 6, June 1981, pages 109-113, Atlanta, Georgia, US; D.WAYE: "An approach to distributed computer control in an integrated pulp mill"
  • [A] JOURNAL OF THE TECHNICAL ASSOCIATION OF THE PULP AND PAPER INDUSTRY, vol. 63, no. 7, July 1980, pages 49-52, Atlanta, Georgia, US; O.-K.FADUM: "A computer-controlled vapor phase digester with a preimpregnation vessel"
  • [A] JOURNAL OF THE TECHNICAL ASSOCIATION OF THE PULP AND PAPER INDUSTRY, vol. 63, no. 11, November 1980, pages 69-72, Atlanta, Georgia, US; E.JUTILA et al.: "Computerized process control of a continuous digester for NSSC pulping"
  • [A] JOURNAL OF THE TECHNICAL ASSOCIATION OF THE PULP AND PAPER INDUSTRY, vol. 67, no. 6, June 1984, pages 30-34, Atlanta, Georgia, US; J.N.McGOVERN: "Development and mill transfer of the FPL semichemical pulping process"
  • [A] ABSTRACT BULLETIN OF THE INSTITUTE OF PAPER CHEMISTRY, vol. 53, no. 7, January 1983, page 790, no. 7252, Appleton, Wisconsin, US; R.HOHOL: "Pulping methods on the threshold of change" & PULP PAPER J. 35, no. 3: 14-16 (APRIL 1982)

Designated contracting state (EPC)

AT BE CH DE FR GB IT LI LU NL SE

DOCDB simple family (publication)

EP 0172135 A1 19860219; CA 1212505 A 19861014

DOCDB simple family (application)

EP 85810326 A 19850717; CA 459020 A 19840717