(19)
(11) EP 0 287 960 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
17.04.1991 Bulletin 1991/16

(43) Date of publication A2:
26.10.1988 Bulletin 1988/43

(21) Application number: 88106006.5

(22) Date of filing: 15.04.1988
(51) International Patent Classification (IPC)4: D21C 1/00, D21C 3/00, C08B 37/14
(84) Designated Contracting States:
AT BE CH DE ES FR GB GR IT LI LU NL SE

(30) Priority: 21.04.1987 FI 871730

(71) Applicant: SciTech Services, Inc.
Tucker, Georgia 30084 (US)

(72) Inventors:
  • Tikka, Panu
    SF-02140 Espoo (FI)
  • Virkola, Nils Erik
    SF-00140 Helsinki (FI)

(74) Representative: Masch, Karl Gerhard, Dr. et al
Patentanwälte, Andrejewski, Honke & Partner, Postfach 10 02 54
D-45002 Essen
D-45002 Essen (DE)


(56) References cited: : 
   
       


    (54) A process for the production of a hemicellulose hydrolysate and special pulp


    (57) The invention relates to a process for the pro­duction of a hemicellulose hydrolysate and special pulp through two steps, the first step comprising the prehydrolysis of the material and the second step the dissolving of the lignin contained in the prehydro­lyzed material. According to the process the lignin dissolving is carried out by means of a neutral sul­phite cooking with anthraquinone or a derivative thereof as a catalyst, the pH of the cooking liquor being initially at least 10.







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