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Journal articles
Magazine articles
Open Access
A hundred years of corrosion in the pulp and paper industry, TAPPI JOURNAL May 2018

A hundred years of corrosion in the pulp and paper industry, TAPPI JOURNAL May 2018

Journal articles
Open Access
Performance of a final hydrogen peroxide stage in the ECF bleaching of Eucalypt DOEOPD1 Kraft Pulps

Performance of a final hydrogen peroxide stage in the ECF bleaching of Eucalypt D0EOPD1 kraft pulps, TAPPI JOURNAL, August 2008

Journal articles
Open Access
Dynamic Modeling of Pressurized Peroxide Stages With Application to Full Bleach Plant Simulation, TAPPI JOURNAL, February 2007

Dynamic Modeling of Pressurized Peroxide Stages With Application to Full Bleach Plant Simulation, TAPPI JOURNAL, February 2007

Journal articles
Magazine articles
Open Access
A novel approach for determining the reactivity of dissolving pulp based on the COD method

ABSTRACT: A novel approach for determining the reactivity of dissolving pulp according to the chemical oxygen demand (COD) of water has been discussed. First, a sample of dissolving pulp was subjected to mercerization and xanthation in order to obtain dissolved cellulose fractions. Next, the fractions were digested with a testing solution as applied in COD procedures. Finally, the resulting liquid was rapidly tested by ultraviolet-visible spectrophotometry (UV-Vis). By quantifying the absorbance of Cr3+ at a wavelength of 600 nm, the reactivity of dissolving pulp was indirectly calculated. The results measured by this novel COD method correlated well with the most accepted Fock test results with less than 10% relative difference. Meanwhile, this newly developed COD method required less time-consuming procedures as compared to the Fock test.

Journal articles
Magazine articles
Open Access
Evaluation of novel drum chipper technology: pilot-scale production of short wood chips, TAPPI Journal October 2019

ABSTRACT: Impregnation of wood chips with acidic pulping liquors is improved when using short chip lengths. If the average wood chip length is too short, conventional chipping technology will generate excess small material, such as pin chips and fines. The possibility of using newly developed drum chipping technology to produce short-length wood chips was evaluated with a pilot drum chipper operating at different drum velocities and in-feed angles. With a drum velocity of 30 m/s, the average wood chip lengths and the combined fractions of pin chips and fines were 24 mm and 3.3%, 22 mm and 4.2%, and 17 mm and 8.5%. The highest fractions of total accept chips (large and small accepts), 89% to 90% without screening, were observed for drum velocities of 30•34 m/s and average wood chips lengths of 21•22 mm. The results indicate the potential of drum chipping technology for producing short wood chips with relatively high fractions of accept chips and tolerable fractions of pin chips and fines.

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
Life-cycle thinking in the pulp and paper industry, part 2: LCA studies and opportunities for development, TAPPI JOURNAL, August 2007

Life-cycle thinking in the pulp and paper industry, part 2: LCA studies and opportunities for development, TAPPI JOURNAL, August 2007

Journal articles
Open Access
Energy reduction at a kraft mill: examining the effects of process integration, benchmarking, and water reduction, TAPPI JOURNAL & Solutions! March 2005, Vol. 4(3)

Energy reduction at a kraft mill: examining the effects of process integration, benchmarking, and water reduction, TAPPI JOURNAL & Solutions! March 2005, Vol. 4(3)

Journal articles
Open Access
Biopulping of whole jute plant in soda-anthraquinone (AQ) and kraft processes, TAPPI JOURNAL & Solutions! March 2005, Vol. 4(3)

Biopulping of whole jute plant in soda-anthraquinone (AQ) and kraft processes, TAPPI JOURNAL & Solutions! March 2005, Vol. 4(3)

Journal articles
Open Access
In-situ reduction of fibrous sludge in a pulp mill aerated stabilization basin, TAPPI JOURNAL May 2005, Vol. 4(5)

In-situ reduction of fibrous sludge in a pulp mill aerated stabilization basin, TAPPI JOURNAL May 2005, Vol. 4(5)

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