IMPROVING DEINKED PULP IMPROVING DEINKED PULP QUALITY BY OXIDATION - - PowerPoint PPT Presentation

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Feb 14, 2024 336 likes •630 views

IMPROVING DEINKED PULP IMPROVING DEINKED PULP QUALITY BY OXIDATION WITH QUALITY BY OXIDATION WITH TEMPO TEMPO by Julie Leroux Centre intgr en pte et papier Universit du Qubec Trois-Rivires Outline Outline Introduction

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IMPROVING DEINKED PULP QUALITY BY OXIDATION WITH TEMPO IMPROVING DEINKED PULP QUALITY BY OXIDATION WITH TEMPO

by Julie Leroux

Centre intégré en pâte et papier Université du Québec à Trois-Rivières

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Outline Outline

Introduction Objectives Approach Experimental Results Conclusions Acknowledgements

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Introduction Introduction

Critical crisis for the Canadian pulp and paper industry

Devastating effects on its future economic growth

Challenges

High value of the Canadian $ vs the US $ Rising costs: Fuel, energy,Wood chips Low prices and overcapacity for several grades Newsprint demand in US is decreasing Quebec: Coulombe report

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Introduction Introduction

Solution? :

Use more deinked pulp (DIP)

To compensate for the reduction in virgin fibres

supply

To reduce production costs

DIP is largely used for

Newsprint Fine papers Tissue papers Boards

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Problematic Problematic

DIP is not used in value added papers

Lower bonding ability of deinked fibres

Lower water re-swelling properties
Chemical and mechanical treatments affect fibre

properties

Residual ink

Aging of offset inks
Ink redeposition during repulping
Reduced optical properties (Grey shade)

Contaminants

Adhesives, waxes and latexes
Stickies (macro and micro stickies)
Affect pulp quality and papermachine runnability

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Objectives Objectives

To increase DIP usage in value added papers

Must improve both optical and physical properties of deinked fibres

To study the oxidizing potential of TEMPO

Improve strength and optical properties of deinked fibres

Establish optimal conditions for oxidation
Determine the effect of addition deinked

fibres to TMP (physical and optical properties)

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Approach Approach

Tempo oxidation of DIP improved strength properties

Determine optimum concentration of NaBr and NaOCl

With optimum concentrations

Make handsheets with oxidized deinked fibres and TMP Determine physical and optical properties

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Experimental Experimental

Deinked Pulp Oxidation with Tempo Filtration and washing Optimized Oxidized Pulp

Handsheet Making and testing

Mixtures with TMP pulp

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Experimental Experimental

2.075 150 0.770 4.75 0.0019 0.025 20 2.075 150 0.411 2.54 0.0019 0.025 19 2.075 150 0.246 1.52 0.0019 0.025 18 2.075 150 0.123 0.76 0.0019 0.025 17 1.038 75 0.770 4.75 0.0019 0.025 16 1.038 75 0.411 2.54 0.0019 0.025 15 1.038 75 0.246 1.52 0.0019 0.025 14 1.038 75 0.123 0.76 0.0019 0.025 13 0.512 37 0.770 4.75 0.0019 0.025 12 0.512 37 0.411 2.54 0.0019 0.025 11 0.512 37 0.246 1.52 0.0019 0.025 10 0.512 37 0.123 0.76 0.0019 0.025 9 0.166 12 0.770 4.75 0.0019 0.025 8 0.166 12 0.411 2.54 0.0019 0.025 7 0.166 12 0.246 1.52 0.0019 0.025 6 0.166 12 0.123 0.76 0.0019 0.025 5 0.083 6 0.770 4.75 0.0019 0.025 4 0.083 6 0.411 2.54 0.0019 0.025 3 0.083 6 0.246 1.52 0.0019 0.025 2 0.083 6 0.123 0.76 0.0019 0.025 1 NaOCl (mmol/g) NaOCl (mL) NaBr (mmol/g) NaBr (g) TEMPO (mmol/g) TEMPO (g) Trial No.

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Results Results

Optimization Pulp mixtures

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