Number of hours
- Lectures 9.0
- Projects -
- Tutorials 4.0
- Internship -
- Laboratory works -
- Written tests 1.5
ECTS
ECTS 25.0
Goal(s)
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
Responsible(s)
Christine CHIRAT
Content(s)
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
PrerequisitesCourse on processes of production of chemical and mechanical fibers (Year 2) and course on wood chemistry (Year 1)
Accessibility for people with disabilities : please contact us for further information
Test
- Specific credits: this course brings 1.5 ECTS to students in UE24 - UE24 - Biomass purification and analytical techniques
- Specific credits: this course brings 1.0 ECTS to students in Paper Sciences Level 1
Written Exam.
Possibility of catch-up session
note = note du DS en présentiel ou à distance
Calendar
The course exists in the following branches:
- Curriculum - Pagora Engineer - Student - Semester 7 (this course is given in english only
) - Curriculum - Master Bio2 - Semester 7 (this course is given in english only )
- Curriculum - - Semester 7 (this course is given in english only )
- Curriculum - Pagora Engineer - Apprentice - Semester 7 (this course is given in english only )
- Curriculum - Master Bio2 - Semester 7 (this course is given in english only )
Additional Information
Course ID : 4FMT1098
Course language(s): 
You can find this course among all other courses.
Environmental security
Les enseignements ont lieu dans des salles de cours.
Penser à éteindre ordinateurs et lumières en quittant la salle.
The lessons take place in classrooms.
Also remember to turn off the lights and any equipment (according to current regulations) when leaving the rooms.
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