Pitch Control Agent for the Kraft Pulping Process

DOI Web Site
  • Sodeyama Takuji
    Paper Chemicals Development, R&D Center, R&D Company, Harima Chemicals, Inc.

Bibliographic Information

Other Title
  • クラフトパルプ製造工程におけるピッチトラブルとピッチコントロール剤による対策

Abstract

Pitch reduces the productivity of the Kraft pulping process by lowering pulp quality and shortening equipment lifespan. The pitch in the process exists as colloids that mainly consist of wood-derived resin acids. It becomes unstable and builds up deposits when the concentration of resins in the system increases or the water pH decreases. A conventional and primary strategy to prevent pitch problems is to improve the pulp washing process with equipment and adding talc to deactivate pitch, but these methods are not always sufficient to prevent the problems. In such cases, adding a pitch control agent to the pitch controlling system is an effective solution to eliminate residual pitch.<br>We have developed a pitch control agent, the “AS series”, which disperses pitch as stable fine particles and retains them on the fiber surface without any adverse effects on pulp qualities. The pitch is stabilized by the AS series and discharged from the Kraft pulping process with the pulp.<br>This paper describes pitch problems in the Kraft pulping process and paper manufacturing process, as well as solutions using pitch control agents, including the AS series.

Journal

  • JAPAN TAPPI JOURNAL

    JAPAN TAPPI JOURNAL 77 (8), 703-707, 2023

    JAPAN TECHNICAL ASSOCIATION OF THE PULP AND PAPER INDUSTRY

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