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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
Added soap contact time with recycled pulp improves flotation deinking efficiency and reduces cost, TAPPI JOURNAL November 2014

Added soap contact time with recycled pulp improves flotation deinking efficiency and reduces cost, TAPPI JOURNAL November 2014

Journal articles
Open Access
Resource efficiency in deinked pulp production â?¢ a review, TAPPI JOURNAL November 2014

Resource efficiency in deinked pulp production • a review, TAPPI JOURNAL November 2014

Journal articles
Open Access
Beyond Kraft? Is kraft pulping as good as it gets?

Guest Editorial: Beyond kraft? Is kraft pulping as good as it gets?, TAPPI JOURNAL October 2014

Journal articles
Open Access
Introduction to the Agenda 2020 Next Generation Chemical Pulping Subgroup

Introduction to the Agenda 2020 Next Generation Chemical Pulping Subgroup, TAPPI JOURNAL October 2014

Journal articles
Open Access
Anthraquinone-a review of the rise and fall of a pulping catalyst

Anthraquinone-a review of the rise and fall of a pulping catalyst, TAPPI JOURNAL October 2014

Journal articles
Open Access
Enhancing yield through high-kappa pulping

Enhancing yield through high?kappa pulping, TAPPI JOURNAL October 2014

Journal articles
Open Access
A new sensor and a novel control concept for optimized fiber line operation

A new sensor and a novel control concept for optimized fiber line operation, TAPPI JOURNAL October 2014

Journal articles
Open Access
Qualification of Welding Procedures for Duplex Stainless Ste

Qualification of Welding Procedures for Duplex Stainless Steels, 1999 Engineering Conference Proceedings

Journal articles
Magazine articles
Open Access
Technological evaluation of Pinus maximinoi wood for industrial use in kraft pulp production, TAPPI Journal August 2021

ABSTRACT: This study characterized Pinus maximinoi wood and evaluated its performance for pulp production. Samples of Pinus taeda wood were used as reference material. For both species, wood chips from 14-year-old trees were used for the technological characterization, pulping, bleaching process analysis, and pulp properties. A modified kraft pulping process was carried out targeting kappa number 28±5% on brownstock pulp. The bleaching sequence was applied for bleached pulp with final brightness of 87±1 % ISO. Refinability and resistance properties were measured in the bleached pulps. Compared to P. taeda wood, P. maximinoi showed slightly higher basic density (0.399 g/cm³) and higher holocellulose (64.5%), lignin (31.1%), and extractives content (4.5%), along with lower ash content (0.16%). P. maximinoi tracheids showed greater wall thickness (6.4 µm) when compared to P. taeda tracheids. For the same kappa number, P. maximinoi and P. taeda resulted in similar screened yield, with an advantage observed for P. maximinoi, which resulted in lower specific wood consumption (5.281 m³/o.d. metric ton), and lower black liquor solids (1.613 metric tons/o.d. metric ton). After oxygen delignification, P. maximinoi pulp showed higher efficiency on kappa reduction (67.2%) and similar bleaching chemical demand as P. taeda pulp. Compared to P. taeda pulps, the refined P. maximinoi pulps had similar results and the bulk property was 10% higher. Results showed that P. maximinoi is an interesting alternative raw material for softwood pulp production in Brazil.

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