Processes and systems for the pulping of lignocellulosic materials
US8262851B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 18, 2007 |
| Grant date | Sep 11, 2012 |
| Priority date | — |
| Expiry date | Jul 1, 2029 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21C9/16
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A non-compression vessel, such as a digester, is employed for the chemical preconditioning of the chips followed by a fiberizing device to break the preconditioned chips down to fiber bundles, which are then washed before a high consistency chemical treatment. The digester may be one such as used in conventional chemical pulping of wood with or without screens for the extraction of chemical. If extracted this chemical could be recirculated to the digester with treatment in the circulation loop such as heating or the addition of dilution or other chemicals. This digester may be hydraulic or vapor phase (that is contain a vapor space within the digester), and operate in either a continuous or batch fashion. This digester allows for the discharge of material without the use of a screw mechanism. The digester treated material is then defiberized to convert the chips into course fiber bundles, which then is washed and dewatered. The washed and dewatered pulp is then treated with alkali peroxide chemicals to develop brightness and other pulp properties.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.