摘要:
This invention relates to a method for treating chemical paper pulp comprising a step of treating the pulp with ozone followed by a step of alkaline extraction, in which alkaline extraction takes place in the presence of magnesium ions (Mg2+).
摘要:
A process for removing sticky contaminants ("stickies") from cellulose-containing fibers such as waste paper is provided. The process comprises contacting the fibers with supercritical or near supercritical carbon dioxide for a period of time sufficient to extract a substantial portion of the stickies without substantially damaging the fibers.
摘要:
DISSOLVING PULPS SUITABLE FOR USE IN THE MANUFACTURE OF VISCOSE RAYON ARE PREPARED FROM UNBLEACHED SULFITE PULPS BY A BLEACHING AND REFINING PROCESS INCLUDING THE STEPS OF (1) CHLORINATION; (2) COMBINED ALKALINE HYPOCHLORITE DILUTE CAUSTIC EXTRACTION; (3) COLD CAUSTIC EXTRACTION WITH CONCENTRATED CUASTIC SOLUTION AND (4) ALKALINE HYPHOCHLORITE TREATMENT.