Process for enhancing white liquor penetration into wood chips by contacting the chips with a mixture of the white liquor and a polymethylalkyl siloxane
US5728265A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 15, 1996 |
| Grant date | Mar 17, 1998 |
| Priority date | — |
| Expiry date | Apr 15, 2016 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21C3/222
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
The efficiency by which pulp cooking liquor components penetrate the wood and enable lignin and resins to be removed from the cellulosic materials is increased by contacting wood chips and the like with a liquid mixture comprised of white liquor containing at least one surfactant selected from the group consisting of a polymethylalkylsiloxane; a co- and terpolymer of silicone and a polyhydric alcohol; an alkoxylated aryl phosphate; an alkoxylated branched alkyl phosphate; an alkoxylated branched alcohol; an alkyl polyglycoside, an alkoxylated alkyl polyglycoside; a mixture of alkali metal salts of alkyl aromatic sulfate, a sulfosuccinate and a silicone; and combinations thereof; for a residence time effective to extract resinous components without substantial degradation of cellulose and thereafter heating at least a portion of the resulting mixture and wood chips.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.