|
|
|
|
 |
|
|
|
Pulp and Paper Science and Technology
|
|
Electrochemistry
|
Persulphate is a safe and stable peroxygen chemical which
is made electrochemically from sulphate
Since 1988, Arbokem has improved the method to manufacture
persulphate for the electrochemical bleaching of pulp.
See following article:
|
Persulphate bleaching
of softwood kraft pulp
A. Wong, S. Wu, C. Chiu and J. Zhao,
Arbokem Inc., Vancouver, Canada
ABSTRACT. An efficient method has been
discovered for the production of sodium persulphate.
Conventional ClO2-based bleaching of kraft pulp has been
found to be enhanced substantially with either the incorporation
of persulphate stage into the bleaching sequence and/or
the combined use of persulphate with ClO2.
Proc. CPPA/TS-TAPPI International
Pulp Bleaching Conference, Vancouver, Canada, June,
1994; Pulp Paper Canada, 96: T236-239 (1995)
|
|
|
Adobe Acrobat Reader is required to view the entire
pdf-formatted presentation. The software can be downloaded
free from Adobe's
web site. |
|
In conventional pulp mills, pulp is bleached with chlorine
dioxide and, invariably, a small amount of deleterious
chlorinated phenolics is produced. This bleachery effluent
is then subjected to biological treament. However, biological
treatment is not completely effective in eliminating all
the deleterious compounds. Some of the hazardous, cholorinated
phenolics are discharged into the rivers and lakes. Persulphate
provides a novel means to suppress the formation of these
chlorinated phenolics during chlorine dioxide bleaching.
Mill productivity was increased also.
Persulphate can be used beneficially with chlorine and/or
hypochlorite for pulp bleaching or used singularly to afford
totally chlorine-free bleaching.
We have invented new uses for persulphate in wood pulp
bleaching and in the manufacture of market pulp from old
corrugated containers. Persulphate is also used for deinking
of wastepaper, bleaching of textiles, etc.
|
|
Persulphate
trial at the Northwood pulp mill in Prince George
in 1992 |
Arbokem's
persulphate technology was practiced in a large-scale
persulphate usage trial held at the Northwood
pulp mill in Prince George in 1992.
The results were :
No chlorinated
organics in treated pulp mill
effluent discharged
into rivers, lakes and oceans.
Higher
pulp mill productivity
Cleaner water
for fish and other
aquatic life
|
|
On July 28,
2004, the Northern Sentinel
in Kitimat reported on Arbokem's
persulphate technology:
"Chemical
plant proponent eyes Alcan power " |
New-technology,
economic opportunities in Northern British Columbia
with Arbokem's persulphate technology
|
JOBS
- 100 permanent, full-time jobs would be created |
A
brand new industrial demand for
" low-cost" power
There is
no waste product except hydrogen gas
|
|
|
More publications |
|
Persulphate enhancement of chlorine dioxide bleaching of softwood kraft
pulp
Al Wong, Yi Feng, Chen Chiu and Stanley
Wu, Arbokem Inc., Vancouver, Canada
ABSTRACT. Persulphate was found to be a particularly useful chemical for
displacing chlorine dioxide in conventional bleaching of kraft softwood
pulp. Applications which included using less ClO2 to achieve the same quality
goal, enhancing conventional ClO2 bleaching, and replacing all ClO2 in
TCF bleaching were investigated. There is a minimal danger of technology
obsolescence with the adoption of persulphate bleaching technology in conventional
bleached wood pulp mills. (AK19131W)
Proc. International Pulp Bleaching
Conference, Halifax, Canada, June 27-30, 2000.
|
|
|
|
|
|
|
|
|
|
| |
|
|
