Method for controlling alkaline pulping process
US4853084A · kind A · utility
2Cited by
0References
3Claims
0Family size
Inventors
Key dates
| Filing date | Mar 9, 1987 |
| Grant date | Aug 1, 1989 |
| Priority date | — |
| Expiry date | Mar 9, 2007 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21C3/228
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A method for controlling the alkaline delignification processes, especially the sulphate process of wood or other materials containing cellulose by the interdepending concentrations of the hydroxymonocarboxylic acids which are formed in the process and dissolved into the waste liquor. According to the method a sufficient number of representative waste liquor samples are taken during the process and the acids present in the samples are analyzed by gas chromatography. Thus, the required time interval for achieving the desired cooking stage can be determined by using the interdepending ratios of the concentrations of certain acids.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.