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Journal articles
Open Access
Detection of kappa number distributions in kraft pulps using nir spectroscopy and multivariate calibration, TAPPI JOURNAL, March 2000, Vol. 83(3)

Detection of kappa number distributions in kraft pulps using nir spectroscopy and multivariate calibration, TAPPI JOURNAL, March 2000, Vol. 83(3)

Journal articles
Open Access
NCASI technical studies of environmental issues affecting fiber supplies, TAPPI JOURNAL, November 2000, Vol. 83(11)

NCASI technical studies of environmental issues affecting fiber supplies, TAPPI JOURNAL, November 2000, Vol. 83(11)

Journal articles
Magazine articles
Open Access
Modeling of the energy of a smelt-water explosion in the recovery boiler dissolving tank, TAPPI Journal August 2020

ABSTRACT: The explosion energy generated as molten smelt droplets interact with water was evaluated as a function of smelt distribution, water temperature, and smelt temperature using a thermodynamic model. The results show that increasing smelt-to-water volume ratio and water temperature significantly increases the explosion energy, converting a larger proportion of the thermal energy of smelt into mechanical work. To reduce the chance of violent smelt-water explosions, it is important to: i) optimize the shatter jet design and operation to uniformly distribute the smelt over a large area in the dissolving tank; ii) avoid high green liquor temperature and ensure adequate liquor mixing; and iii) avoid upsets that may cause heavy smelt runoff or jellyroll smelt.

Journal articles
Open Access
Revised steady-state model for chlorine dioxide brightening

Revised steady-state model for chlorine dioxide brightening that considers extraction washer carryover effects, TAPPI JOURNAL March 2016

Journal articles
Magazine articles
Open Access
Exergy and sensibility analysis of each individual effect in a kraft multiple effect evaporator, TAPPI Journal October 2019

ABSTRACT: The multiple effect evaporator (MEE) is an energy intensive step in the kraft pulping process. The exergetic analysis can be useful for locating irreversibilities in the process and pointing out which equipment is less efficient, and it could also be the object of optimization studies. In the present work, each evaporator of a real kraft system has been individually described using mass balance and thermodynamics principles (the first and the second laws). Real data from a kraft MEE were collected from a Brazilian plant and were used for the estimation of heat transfer coefficients in a nonlinear optimization problem, as well as for the validation of the model. An exergetic analysis was made for each effect individually, which resulted in effects 1A and 1B being the least efficient, and therefore having the greatest potential for improvement. A sensibility analysis was also performed, showing that steam temperature and liquor input flow rate are sensible parameters.

Journal articles
Open Access
Gas chromatographic analysis of acetone extractives in lodgepole pine and western hemlock thermomechanical pulp furnish, TAPPI JOURNAL, September 2002 (177KB)

Gas chromatographic analysis of acetone extractives in lodgepole pine and western hemlock thermomechanical pulp furnish, Solutions! & TAPPI JOURNAL, September 2002 (177KB)

Journal articles
Open Access
Factors affecting fatty acid oxidation and the formation of odorous aldehydes during tmp production, TAPPI JOURNAL, July 2003, Vol. 2(7) (99KB)

Factors affecting fatty acid oxidation and the formation of odorous aldehydes during tmp production, Solutions & TAPPI JOURNAL, July 2003, Vol. 2(7) (99KB)

Journal articles
Magazine articles
Open Access
Understanding the risks and rewards of using 50% vs. 10% strength peroxide in pulp bleach plants, TAPPI Journal November 2018

Authors: Alan W. Rudie and Peter W. Hart | ABSTRACT: The use of 50% concentration and 10% concentration hydrogen peroxide were evaluated for chemical and mechanical pulp bleach plants at storage and at point of use. Several dangerous occurrences have been documented when the supply of 50% peroxide going into the pulping process was not stopped during a process failure. Startup conditions and leaking block valves during maintenance outages have also contributed to explosions. Although hazardous events have occurred, 50% peroxide can be stored safely with proper precautions and engineering controls. For point of use in a chemical bleach plant, it is recommended to dilute the peroxide to 10% prior to application, because risk does not outweigh the benefit. For point of use in a mechanical bleach plant, it is recommended to use 50% peroxide going into a bleach liquor mixing system that includes the other chemicals used to maintain the brightening reaction rate. When 50% peroxide is used, it is critical that proper engineering controls are used to mitigate any risks.

Journal articles
Magazine articles
Open Access
Using multistage models to evaluate how pulp washing after the first extraction stage impacts elemental chlorine-free bleach demand, TAPPI Journal November 2018

Using multistage models to evaluate how pulp washing after the first extraction stage impacts elemental chlorine-free bleach demand, TAPPI Journal November 2018

Journal articles
Open Access
Nutrient limited biofilm pretreatment - an efficient way to upgrade activated sludge plants, TAPPI JOURNAL, June 2002 (131KB)

Nutrient limited biofilm pretreatment - an efficient way to upgrade activated sludge plants, Solutions! & TAPPI JOURNAL, June 2002 (131KB)

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