Course syllabus

Course-PM

KBT130 KBT130 Cellulose technology lp3 VT21 (7.5 hp)

Course is offered by the department of Chemistry and Chemical Engineering

Contact details

Examiner:

Assoc. Prof. Merima Hasani, merima.hasani@chalmers.se

 

Lecturers:

Assoc. prof. Merima Hasani (MH), merima.hasani@chalmers.se

Prof. Hans Theliander (HT), hanst@chalmers.se

Tech Lic. Henric Dernegård (HD), Södra skogsägarna

Adj. Prof. Magnus Paulsson, Nouryon

Dr. Rickard Wadsborn (RW), StoraEnso

 

Lab supervisors:

L1: Kenneth Arandia

L2: Axel Martinsson

L3: Shirin Naserifar

Course purpose

The purpose of the course is to give the students knowledge of the different processes for paper pulp production from wood. Some important operations are highlighted in the laboratory sessions (kraft pulping, bleaching and mechanical pulp production). In a minor project work, the students are introduced in how to calculate the cooking time.

 

Schedule:

Course calendar

Course literature

1. Selected chapter from the e-book (available from Chalmers library):

             Pulp and Paper Chemistry and Technology

             Volume 1 Wood Chemistry and Wood Biotechnology

             Volume 2 Pulping Chemistry and Technology 

2. Hand-outs and lecture notes

 

Course design

The course is structured around following lectures and laboratory work:

1. Introduction + Wood chemistry and wood morphology (HT, MH)                                    
2. Wood chemistry and wood morphology (MH)                                                                             
3. Wood chemistry and wood morphology (MH)                                                                             
4. Kraft process: Pulping technology and chemistry (HT)                                   
5. Kraft process: Pulping chemistry (HT)                                                                              
6. Kraft process: Pulping kinetics (HT)                                                                                               
7. Kraft process: Developments in pulping process design (HT)                                          
8. Kraft process: Bleaching-Chemistry and process design (HT)                                      
9. Kraft process: Bleaching-Chemistry and process design (HT)                                      
10. Kraft process: Screening and washing of pulp (HT)                                                       
11. Kraft process: Chemical recovery-evaporation and soda boiler (HT)                      
12. Kraft process: Chemical recovery-white liquor preparation (HT)                            
13. Non-Process elements (RW)                                                                                                           
14. Mechanical pulping: Fibre properties, SGW, TMP and CTMP (HT)                  
15. Mechanical pulping: Bleaching and brightness stability (MP)                                     
16. Sulfite pulping and pulp drying (HT)                                                                              
17. Cellulose, hemi. and lignin: future use of these biopolymers (HT)                             
18. Material and energy flows in the kraft process (HD)                                                   
19. So, what have we learned in this course (HT)                                                              

Project (four students in each group)

K: Kraft cooking kinetics                              Kenneth Arandia

(Introduction to the project at lecture no. 6)

                            

Laboratory sessions (same groups as in the project)

(Monday 13.00-17.00 and Thursday 08.00-12.00)

 

Kraft cooking/ Mech. Pulping:           (supervisor: )

      

Bleaching: Hydrogen peroxide bleaching of kraft pulp  (Axel Martinsson)

 

Analyses: Determination of kappa number, viscosity and brightness of the kraft pulps

obtained in the previous laboratory sessions. (Shirin Naserifar)

 

Learning objectives and syllabus

• describe the macroscopic and morphological structure of wood and give a basic description of the chemical structure of the wood constituents (cellulose, hemicelluloses, lignin and extractives)
• describe different processes related to mechanical pulp production (SGW, TMP and CTMP) and explain the mechanisms leading to fibre separation during mechanical pulp production processes as well as differences in resulting pulp properties
• describe and discuss the different events taking place during kraft pulping (steaming, impregnation and delignification) - chemical, physical and kinetic aspects should be covered
• describe batch and continuous kraft pulping processes (including both conventional and modified processes)
• describe how washing, sieving and drying of pulp are carried out and discuss different phenomena involved in these operations.
• describe and discuss different bleaching sequences applied in the brightening of kraft pulp (including chemical and environmental aspects, different types of equipment, as well as pulp fibre properties)
• describe and discuss processes and phenomena involved in the chemical recovery in the kraft process (evaporation, combustion in the recovery boiler and white liquor preparation)
• give a basic description of the production of sulphite pulps and semi-chemical pulps

 

Examination form

The examination includes a written exam, one project, three laboratory sessions and a study visit. The final grade will be set by the written exam and the projects. The written exam can give 80 points. Depending on the quality of the project report, a maximum of 5 points will be added to the result of the written exam.

 < 40 points                 failed

40-51.5 points             grade 3

52-63.5 points             grade 4

≥ 64 points                  grade 5