| 摘要 |
PCT No. PCT/FI97/00273 Sec. 371 Date Jan. 12, 1999 Sec. 102(e) Date Jan. 12, 1999 PCT Filed May 6, 1997 PCT Pub. No. WO97/42371 PCT Pub. Date Nov. 13, 1997An alkaline cellulose pulp pulping process treats soap and fiber-containing liquids to separate fibers from the liquids prior to further treatment of the liquids (e.g. by evaporation and combustion, or by cooking to produce tall oil). Black liquor containing soap, and/or washer filtrate containing soap, are fed to one or more soap separating tanks, and then the soap fraction from the top of the tanks is fed to a pressure screen where fiber separation takes place (preferably at a temperature of at least 70 DEG C.). Black liquor may be added to the soap fraction to dilute it, and preferably simultaneously raise its temperature. The pressure screen has a screen surface with holes of 0.4 mm diameter or less, or slots with a width of 0.2 mm or less.
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