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US 2015/0176207 A1Published application
Chemical Pulping Method
AssigneeBeijing Insight Biomass LLC
InventorsYingwu Yin, Peng Wan, Honggui Yu, Yujuan Zhang, Xiangxiang Sun, Lingyan Zhang
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Abstract
The present invention provides a pulping method. Caustic soda is replaced with cheap lime to manufacture pulp in high efficiency, and meanwhile complexation, flocculation and acid-base neutralization of aluminum sulfate are further utilized, so as to recycle effective ingredients in a black liquid, achieve a yield approximate to a mechanical pulp yield, obtain quality of the chemical pulp, implement cyclic utilization of the black liquid and solve the pollution thereof.
Claims10
A pulping process, including:
- 1) cooking the plant raw materials using the composite alkali containing sulfate and lime and/or carbide slag, to prepare a fiber pulp containing fibers and black liquor;
- 2) optionally, after the completion of cooking and/or during pulping process, adding aluminum sulfate to the pulp, to flocculate and settle the organic macromolecules of the black liquor and adsorb the same on the fibers, and then separating them out;
- and/or
- 3) optionally, adding plant raw materials and alkali used in the existing alkaline process, or other weak alkalis such as lime and/or carbide slago and the like to the sulfate-containing filtrate which is obtained by filtering out the insoluble substances of the pulp, to prepare a fiber pulp.
1 more element
A pulping process, including:
- 1) cooking the plant raw materials using the existing alkaline or kraft process, to prepare a fiber pulp containing fibers and black liquor;
- and
- 2) after the completion of cooking and/or during pulping process, adding aluminum sulfate to the pulp, to flocculate and settle the organic macromolecules of the black liquor and adsorb the same on the fibers, and then separating them out;
- and/or
- 3) optionally, adding plant raw materials, sulfate and the alkali used in the existing alkaline process, or the composite alkali containing sulfate and lime and/or carbide slag to the filtrate which is obtained by filtering out the insoluble substances of the pulp, to prepare a fiber pulp.
2 more elements
Dependencies are inferred from the claim text.