Akhlesh Mathur - Global Market Segment Lead, Pulp

Edouard Valton - Senior Application Specialist, Pulp

Novel Cellulose-Based Detackifier for Efficient Pulp Mill Pitch Control

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Agenda

Pitch in Wood

Traditional Pitch Control Program

Novel Cellulose-Based Detackifier

- Principle

- Mode of Action

- References

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What is Pitch? Pitch is the collective term used to describe

the hydrophobic wood resin materials found in the pulp

Resin is a naturally occurring organic component of all trees

- functions as an energy storage source (fats) in tree and a defense mechanism against disease and insects

- typically occurs in ‘free flowing' resin canals (most softwoods and some tropical hardwoods) and as a storage inclusion in parenchyma cells (predominant resin source in most hardwoods)

- makes up (typically) 1 to 6% of the wood volume (DCM extract), with higher concentrations in the bark and the heartwood (especially in older trees)

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Pitch in Wood

Large part of the pitch is neutral (esters + sterols)

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Physical Forms of Pitch

Deposit

Agglomerate

Colloidal

Adsorbed ontofiber surface

Encapsulated

Na

Na-

-

-

-

Soluble / Soaps

Desirable Form

Minimize and

Control

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Pitch/Resin Entering the System

When pitch/resin enters the pulp making system, it takes one (or a combination) of the following routes: Carried with fibers causing dirt speck

- This undesirable path causes pitch problems in the downstream user systems.

Enters with water (black liquor)- This is the preferable route as it is easier to eliminate from the system

utilizing specialty chemicals.

Deposits on process equipment- This is undesirable since deposits within the system can cause

uncontrolled slough off causing dirt. This dirt can reduce process flow leading to process inefficiency and the need to clean the system requiring downtime.

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Chemical Program Options

Form Where to treat and wash or stabilize

Depositability DeTac™ contaminant control agents, surfactants

Free particle stability Anionic and non-ionic dispersants

Content Dispersants, fixatives and polymers

Surface affinity Surfactants and cleaners

Pitch Control Treatment

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Traditional Pitch Control

Pitch control in pulp mills is achieved by:

- Deresination - digester additive, wash aids, drainage aid

- Control of pitch deposit - avoid fouling

Traditional pitch control programs

- Talc (Mg3Si4O10(OH)2)

- Surfactant (ethoxylated material)

- Dispersant (anionic)

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Infinity™ PK7825E Pulp Processing Aid Novel Cellulose-Based Detackifier

Patented technology

Non-ionic – wide range of pH usage

Hydrophobic side groups enhance pitch coating and detackification

Effective talc replacement

Shear resistant

FDA and BfR approved

More effective than traditional detackifier

Pumpable

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Infinity PK7825E Pulp Processing Aid

No observed interference with pulp mill or bleach plant chemistries - Mill experience

Potential feed points- Temperature, pH and bleach chemistry tolerant

Infinity PK7825E Pulp Processing Aid Novel cellulose-based detackifier

Principle

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Infinity PK7825E Pulp Processing Aid:Principle

Product formerly developed for mechanical grades for P stage bleaching

Pitch content is not affected during peroxide stage

Pitch content during peroxide bleaching

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Electrolyte addition, mmol/L Electrolyte addition, mmol/L

Unbleached TMP Peroxide Bleached TMP

Infinity PK7825E Pulp Processing Aid:Principle Loss of hemicellulose during peroxide bleaching

destabilizes pitch (agglomeration)

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Infinity PK7825E Pulp Processing Aid:Principle Enhanced hemicellulose with greater pitch control

power

Infinity PK7825E pulp processing aid is used to compensate the lack of natural stabilizers

Benefits:- More stable pitch- Decreased agglomeration- Decreased deposition potential

Infinity PK7825E Pulp Processing Aid Novel cellulose-based detackifier

Mode of Action

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Infinity PK7825E Pulp Processing Aid : Mode of Action Hydrophobic interaction with pitch surfaces

Protective layer is used for detackification

HydrophobicHydrophilic

Protective Layer

+

HydrophobicPitch particle

Infinity PK7825E Pulp Processing Aid

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Encapsulation, Passivation, Detackification

Benefits:• Multiple attachment points• Internal film crosslinks• Tough hydrophilic film• Improved pitch controlHydrophobic

SegmentHydrophilic Segment

Pitch

Pitch Stabilizer

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Benefits

Detackification with Infinity PK7825E pulp processing aid is shear resistant

Impinging Jet Deposition During Stagnet Flow(Contract work by Aquantix, a unit of Alberta Research Council)

0

100

200

300

400

500

600

700

800

900

Untreated pitch Fixative Detac DC3970 DeTac 7225

Equal actives treatment

par

ticl

es /

mm

2d

epo

site

d o

n g

lass

su

rfac

e

5 min

90 min

Zero particles deposited up to 90 minutes

Impinging Jet Deposition During Stagnet Flow(Contract work by Aquantix, a unit of Alberta Research Council)

0

100

200

300

400

500

600

700

800

900

Untreated pitch Fixative Detac DC3970 DeTac 7225

Equal actives treatment

par

ticl

es /

mm

2d

epo

site

d o

n g

lass

su

rfac

e

5 min

90 min

Zero particles deposited up to 90 minutes

Infinity PK7825EPulp Processing Aid

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Benefits Eliminates talc feeding system

- Workforce cost

- Unit maintenance cost

- Increased safety (big bag handling, inhalation, slips, falls)

Decrease ClO2 consumption / OBA use Lower ash content in final pulp Wide range of pH (acid to alkaline) Behaves like fibers Fully approved formulation for food contact Non-hazardous chemical Easy to pump Detackification unchanged in high shear Temperature resistant

Infinity PK7825E Pulp Processing Aid Novel cellulose-based detackifier

References

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Mill A: Europe - HW Kraft Infinity PK7825E pulp

processing aid dosed to outlet of pre D2 filter- Prevents agglomeration

in D2 tower (reactor)

- Treated colloidal pitch is better washed away in D2 filter (VF6)

- Extractives retaining in pulp are treated and not agglomerating in HCST

Infinity PK4401 pulp processing aid is a fixative for colloidal balance control in white water system

D2

Hot water

Infinity PK4401 Pulp Processing Aid

30g/t

Intermediatechest

Filtered

waterVF5

VF6

HCST

Infinity PK7825E Pulp Processing Aid

250 g/t

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Infinity PK7825E pulp processing aid dosed to four points- VF3 outlet dose prevents

agglomeration in D2 tower (reactor)

- VF5 outlet dose keeps the pulp cleaners open

- Dose to showers on thickeners are to avoid periodical deposit formations and thereby to keep dirt count at low level (tgt <1.5 mm 2/kg) all the time

D2

Hot waterWarm water

VF3

VF5

Infinity PK7825E Pulp Processing Aid

Mill B: Europe - Integrated HW Kraft

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D2

Blow Tank

Brown stock

Storage Tower

Bleached Pulp

Storage Tower

D1

EOP

To paper machine

Infinity PK7825EPulp Processing Aid

300 g/t

Mill C: Europe - Kraft HWTalc Replacement

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Mill D: US - Northeastern Sulfite Mill Species

- Hardwood

- Pine

Dosage- Trial Infinity PK7825 pulp processing aid at 1.1 kg/ton replacing 9 kg/ton of talc

- Product fed to E-Stage bleach washer discharge

Benefits - ClO2 usage reduced to reach target brightness with talc removed

- Talc usage eliminated

- OBA usage in paper mill reduced

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Mill E: US - TMP Refiner

Species- Pine, hydrosulfite bleached

Production - 800 ADT/d integrated

Dosage- Infinity PK7825 pulp processing aid at 300g/ton replacing lignosulfonate

- Product fed before refiner

Benefits - Clean plate on refiner

- Minimal customer complaint regarding pitch

- Cost improvement

Thank you for your attention