Method of monitoring and inhibiting scale deposition in pulp mill evaporators and concentrators
US7985318B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 10, 2007 |
| Grant date | Jul 26, 2011 |
| Priority date | — |
| Expiry date | Sep 5, 2028 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21C9/008
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A method of monitoring and inhibiting scale precipitation and deposition from spent liquor in pulp mill evaporators and concentrators is disclosed. The method includes connecting a black liquor deposition monitor to a pulp mill evaporator or concentrator and measuring the thermal conductivity on the outer surface of the monitor. A controller interprets the measured thermal conductivity and determines a level of scale deposition. If the level of scale deposition is above a predetermined level, the controller is operable to introduce a scale-inhibiting composition to the spent liquor. The scale-inhibiting composition may include organic polycarboxylic acids; organic fatty acids; low molecular weight and polymeric aromatic acids; organic acid esters, anhydrides, and amides; low molecular weight and polymeric aliphatic and aromatic sulfonic acids; and low molecular weight and polymeric amines; and any combinations.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.