Batch multivariate SPC monitoring of a sulfite pulp digester

2003 ◽  
Author(s):  
M. Champagne ◽  
R. Monette
Keyword(s):  
Sulfite Pulp ◽  
Pulp Digester

Evaluation of a molybdenum sulfide reference electrode in hot alkaline solutions

TAPPI Journal ◽  
2010 ◽  
Vol 9 (7) ◽  
pp. 35-41
Author(s):  
OUTI A. HYÖKYVIRTA ◽  
TOM E. GUSTAFSSON
Keyword(s):  
Molybdenum Disulfide ◽  
Surface Film ◽  
Reference Electrode ◽  
Exposure Period ◽  
Molybdenum Sulfide ◽  
Alkaline Solutions ◽  
Internal Reference ◽  
Cell Potential ◽  
Pulp Digester ◽  
Alkaline Sulfide

This investigation evaluated the applicability of a molybdenum sulfide reference electrode (MSRE) as an internal reference electrode for use in alkaline sulfide solutions over a range of pulp digester liquors at 170°C. The electrode remained stable during the exposure period of two weeks. The experimentally determined half cell potential of the MSRE is E = -0.91 VSHE. The surface of the MSRE was examined by scanning electron microscope (SEM) and electron spectroscopy for chemical analysis (ESCA) to verify the chemical composition of the thin surface film. Based on ESCA studies, the surface film contained molybdenum disulfide and sodium disulfide. During storage of the specimens, sulfide was partly oxidized to sodium sulfite in air. Next to the metallic molybdenum, a mixed molybdenum disulfide and molybdenum hydroxide layer was detected.

scholarly journals Neural network-based software sensor: training set design and application to a continuous pulp digester

2005 ◽  
Vol 13 (2) ◽  
pp. 135-143 ◽  
Author(s):  
Pascal Dufour ◽  
Sharad Bhartiya ◽  
Prasad S. Dhurjati ◽  
Francis J. Doyle III
Keyword(s):  
Neural Network ◽  
Set Design ◽  
Training Set ◽  
Software Sensor ◽  
Pulp Digester ◽  
Design And Application

scholarly journals STUDIES ON PITCH TROUBLE CONTROL OF SULFITE PULP WITH SURFACTANTS

1962 ◽  
Vol 18 (5) ◽  
pp. 421-426 ◽  
Author(s):  
Hiroshi Yamada ◽  
Takehiko Tange ◽  
Wasaburo Kimura
Keyword(s):  
Sulfite Pulp

Cathodic Protection Proposed for Vapor Area in Pulp Digesters

CORROSION ◽  
1961 ◽  
Vol 17 (6) ◽  
pp. 26-28
Author(s):  
L. C. Wasson
Keyword(s):  
Porous Material ◽  
Cathodic Protection ◽  
Steel Sheet ◽  
Electrical Conductance ◽  
Filler Material ◽  
Tank Wall ◽  
Moisture Vapor ◽  
Pulp Digester ◽  
Floating Type ◽  
Pulp Digesters

Abstract Proposes a system of cathodic protection for pulp digester tanks that will protect not only tank areas covered by liquid but also areas covered by vapor from liquid contents in tank. Outlines five requirements such a system should have. Describes inner lining of steel sheet used as anode with filler material between anode and tank wall. Filler suggested is cement and plaster of parts to achieve a porous material that will permit electrical conductance paths of moisture vapor through the material. Give details of mounting anode sheets to tank and also a floating type platform for use inside tank to install and replace anode sheets. 5.2.1, 8.5.3

scholarly journals Influence of Input Variables over the Wood Digestion in a Sulfite Pulp Mill for Biorefinery Purposes

2015 ◽  
Vol 6 (2) ◽  
pp. 160
Author(s):  
Cristina Rueda ◽  
Carlos Tejedor ◽  
Natalia Quijorna ◽  
Ana Andrés ◽  
Alberto Coz
Keyword(s):  
Pulp Mill ◽  
Raw Material ◽  
Pulp Yield ◽  
Cellulose Content ◽  
Digestion Process ◽  
Sulfite Pulp ◽  
Input Variables ◽  
Major Attention ◽  
Wood Digestion ◽  
Better Than

Eucalyptus globulus is the most profitable specie in Europe for pulping. However, in recent years some diseases and pests have caused its defoliation, affecting the available quantity of wood. In this sense, the mills are studying how to avoid the loss of pulp yield as well as the optimization of byproducts in order to take advantage of every component present in the wood using biorefinery processes. One of the possible options is to complete the consumption of E. globulus with other species such as Eucalyptus nitens.The objective of this paper is to study the behavior of both species related to the dissolving pulp manufacturing process as well as the characteristics of the resulting products. Parameters that can be very useful for the evaluation of the raw material, such as the growing data or density of both species, have been compared. Major attention has been focused on the composition of both species and how it affects the characteristics of the possible final products.E. nitens presents good results of forestry characteristics, being better than E. globulus in terms of growing and resistance to frosts. The cellulose content of both species is similar, however the digestion process in the case of E. nitens needs to be improved in order to optimize the involved energy and the obtained products.

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