Course-PM

KBT130 Cellulose technology lp3 VT20 (7.5 hp)

Course is offered by the department of Chemistry and Chemical Engineering

Contact details

Examiner:

Prof. Hans Theliander, hanst@chalmers.se

 

Lecturers:

Prof. Hans Theliander (HT)

Asoc. prof. Merima Hasani (MH)

Tech Lic. Henric Dernegård (HD), Södra skogsägarna

Adj. Prof. Magnus Paulsson, Nouryon

Dr. Rickard Wadsborn (RW), StoraEnso

 

Lab supervisors:

L1: Joanna Wojtasz-Mucha

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

TimeEdit

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

Lectures                                                                                                                                        Day     Time   Room

1. Introduction + Wood chemistry and wood morphology (HT, MH)                                20/1     10-12   KS1
2. Wood chemistry and wood morphology (MH)                                                                          22/1     10-12   KS1
3. Wood chemistry and wood morphology (MH)                                                                         22/1     13-15   KS1
4. Kraft process: Pulping technology and chemistry (HT)                                                      27/1     08-10   KS2
5. Kraft process: Pulping chemistry (HT)                                                                                          27/1     10-12   KS2
6. Kraft process: Pulping kinetics (HT)                                                                                                 3/2       08-10   KS1
7. Kraft process: Developments in pulping process design (HT)                                           3/2       10-12   KS1
8. Kraft process: Bleaching-Chemistry and process design (HT)                                       10/2     10-12   KS1
9. Kraft process: Bleaching-Chemistry and process design (HT)                                       12/2     10-12   KS1
10. Kraft process: Screening and washing of pulp (HT)                                                              12/2     13-15   KS1
11. Kraft process: Chemical recovery-evaporation and soda boiler (HT)                        17/2     10-12   KS1
12. Kraft process: Chemical recovery-white liquor preparation (HT)                               19/2     10-12   KS1
13. Non-Process elements (RW)                                                                                                              19/2     13-15   KS1
14. Mechanical pulping: Fibre properties, SGW, TMP and CTMP (HT)                            24/2     10-12   KS2
15. Mechanical pulping: Bleaching and brightness stability (MP)                                       26/2     10-12   KS1
16. Sulfite pulping and pulp drying (HT)                                                                                             26/2     13-15   KS1
17. Cellulose, hemi. and lignin: future use of these biopolymers (HT)                               2/3       10-12   KS1
18. Material and energy flows in the kraft process (HD)                                                        11/3      10-12    KS1
19. So, what have we learned in this course (HT)                                                                        11/3     13-15   KS1

 

Project (four students in each group)

K: Kraft cooking kinetics                                           Joanna Wojtasz-Mucha

(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:           (Joanna Wojtasz-Mucha /Ximena Rozo Sevilla)

Room 3113                 

 

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

Room 3169

 

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

Room 3168      obtained in the previous laboratory sessions. (Shirin Naserifar)

 

 

Changes made since the last occasion

One extra lecture on materials and energy flows in a Kraft pulp mill (Guest lecture from industry)

 

Learning objectives and syllabus

Learning objectives:

• 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

Link to the syllabus on Studieportalen.

Study plan

 

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