Semi-chemical pulping process

Details Semi-chemical pulping process Semi-chemical pulping process

D - Textiles, Paper

21

C

9/16

D21C 3/20 (2006.01)

Patent

CA 1186855

ABSTRACT OF THE DISCLOSURE A process for producing corrugating medium pulp, fuel, and other products from a wide variety of woody materials is disclosed. In one embodiment a pulping solution is pro- duced by cooking green chips in a water solution of mono- ethanolamine and subsequently collecting the liquor produced. Pulp is then produced by digesting chips under a vapor dome of the pulping solution, or cooking the chips in the solution and subsequently digesting under a vapor dome. Digested chips are then refined in pulping solution to produce corrugated medium pulp. In another emboidment, fuel may be produced by digesting woody material under a vapor dome with sulfur dioxide and ammonia. The digested chips then yield a lignin containing liquor which has a good fuel value and may be used as a liquid fuel or impregnate for woody material. In another embodiment the pulping solution is used as a hard wood conversion resin. Wood is impregnated and pressed. The pressed wood may have a density of twice the original wood. Monoethanolamine vapor also can convert soft wood to hard wood. When wood is vapor impregnated under a vapor dome it may be pressed to a more dense configuration. In both hard wood embodiments the pressed wood maintains its pressed configuration so that it may be used in construction or as a fuel.

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