Patents Assigned to Gebruder Kammerer Projekt Agentur GmbH
  • Wood pulping with acetic acid with the addition of formic acid
    Patent number: 6139683
    Abstract: In a process for the extraction of celluloses from lignocelluloses, the extraction is carried out by means of heating with aqueous acetic acid under pressure and the addition of formic acid, whereby there is obtained a cellulose with a very low residual lignin content, which can be bleached with ozone and peracetic acid to high grades of white, and acetic and formic acid are recovered by means of distillation, so that waste waters do not, therefore, accumulate.
    Type: Grant
    Filed: October 6, 1995
    Date of Patent: October 31, 2000
    Assignee: Gebruder Kammerer Projekt Agentur GmbH
    Inventors: Horst Harry Hermann Nimz, Martin Schone