Chemical pulping method
US9951476B2 · kind B2 · utility
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2References
16Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 25, 2013 |
| Grant date | Apr 24, 2018 |
| Priority date | — |
| Expiry date | Jul 14, 2033 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21C3/02
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.