Review of Thermomechanical Pulping (TMP): Process, Energy Intensity and Fibre Performance

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Kemiantekniikan korkeakoulu | Bachelor's thesis
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Authors

Date

2024-04-26

Department

Major/Subject

Chemical Engineering

Mcode

CHEM3054

Degree programme

Aalto Bachelor's Programme in Science and Technology

Language

en

Pages

36 + 5

Series

Abstract

This thesis investigates the viability of Thermomechanical pulping (TMP) as a sustainable alternative to Kraft pulping, through a comprehensive review of operational steps, energy intensity, and resulting pulp characteristics. A comparative analysis between the two processes is established and key engineering factors impacting TMP efficiency and resultant pulp properties are identified, including energy consumption, refining intensity and chip washing. TMP is highly regarded for its high yield and minimal chemical use; however, it is limited by higher energy consumption per ton when compared to Kraft. A knowledge gap is identified on the mechanism of the refiners as theoretical values of energy consumption are significantly lower than actual values. Potential improvements to the energy situation are explored such as low consistency refining and BIGCC integration. Findings indicate TMP pulp to experience lower strength and higher colour reversion, despite exhibiting superior recyclability. A scarcity of recent literature highlights further knowledge gaps. Given the importance of sustainability, continued research on TMP technology to improve environmental and economic viability is crucial for broader future adoption.

Description

Supervisor

Hummel, Michael

Thesis advisor

Dessbesell, Luana

Keywords

TMP, thermomechanical pulping, fibre performance, energy, process, sustainability

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https://urn.fi/URN:NBN:fi:aalto-202406184541

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[kand] Kemian tekniikan korkeakoulu / CHEM