Aller au menu Aller au contenu
A new generation of engineers

Paper, print media and biomaterials

A new generation of engineers
A new generation of engineers

> Education

Fibres Bleaching - 4FMT1098

A+Augmenter la taille du texteA-Réduire la taille du texteImprimer le documentEnvoyer cette page par mail cet article Facebook Twitter Linked In
  • Number of hours

    • Lectures : 9.0
    • Tutorials : 4.0
    • Laboratory works : 0
    • Projects : 0
    • Internship : 0
    • Written tests : 1.5
    ECTS : 25.0
  • Officials : Christine CHIRAT

Goals

Learning outcomes :

  • To know the chemistry used in the different bleaching processes;
  • To develop a bleaching sequence according to the desired characteristics;
  • To characterize the environmental impact of bleaching according to the processes used
Contact Christine CHIRAT

Content

Knowledge of pulp bleaching processes (chemical and mechanical pulp) and cellulose for chemical or textile use: bleaching agent chemistry (mechanisms of action on lignin and carbohydrates), processes (equipment), environmental aspects related to bleaching.

1. Bleaching of chemical pulps
Introduction and history of bleaching
Constituants of chemical pulps that impact bleaching
Different types of equipment needed for bleaching
Study of the different bleaching stages including , for each, the three following aspects : reaction mechanisms of the bleaching chemical on pulp components; technological aspects ; environmental aspects (when relevant). Bleaching stages studied : chlorine stage (C), chlorine dioxide (D), oxygen (O), extraction stages (E, Ep, Eo, Eop), Z (Z), peracetic acid (Pa) and enzymes.

2. Bleaching of mechanical pulps
Constituants of chemical pulps that impact bleaching
Oxidative bleaching (hydrogen peroxide) : reaction mechanisms, technological aspects
Reductive bleaching (sodium dithionite) : reaction mechanisms, technological aspects

Targeted skills: developing solutions and innovation; managing a process or system; acting for sustainable development



Prerequisites

Course on processes of production of chemical and mechanical fibers (Year 2) and course on wood chemistry (Year 1)

Tests

Written Exam.
Possibility of catch-up session



note = note du DS

Calendar

The course exists in the following branches:

Additional Information

Semester 7 - This course is given in english only EN

Curriculum->Pagora Engineer - Student->Semester 7
Curriculum->Pagora Engineer - Apprentice->Semester 7
Curriculum->Master Bio2->Semester 7


Sécurité-Environnement

Bibliography

1. DENCE C., REEVE D. Pulp bleaching : principles and practice. Atlanta : TAPPI Press, 1996.
2. SIXTA H. Handbook of pulp. Volumes 1 &2. Wiley-VCH Verlag GmbH&Co. KGaA, 2006.
3. CHIRAT, C. (leading author), HOSTACHY, J.C., PALONIEMI, J., PELIN, K., POHJANVESI, S., NORDEN, S., VESALA, R., WENNERSTRÖM, M.(supporting authors), « Bleaching » in « Papermaking Science and Technology. Book 6. Chemical Pulping (Part 1). Fibre chemistry and technology . Second edition» , ed. by P. Fardim, Publisher Paper Engineers’ Association/Paperi ja Puu Oy, ISBN 978-952-5216-41-7, pp 457-599, 2011

A+Augmenter la taille du texteA-Réduire la taille du texteImprimer le documentEnvoyer cette page par mail cet article Facebook Twitter Linked In

Date of update July 24, 2020

Université Grenoble Alpes