Full scale trail with Nopcosperse ENA-2048 @ Stora Enso Skutskär.

Full scale trail with Nopcosperse ENA-2048 @

Stora Enso Skutskär

Agenda• Nopcosperse ENA-2048• Facts about Skutskär• Fiber line 3 – birch line (HW)• Dosage of ENA-2048• Results

• Acetone extract• Tall oil production• Betulin

• Conclusions

Nopcosperse ENA-2048New digester additive for deresination of hardwood

Nopcosperse ENA-2048 is highly effective synthetic digester additive that has been developed to replace rosin soap and tall oil in hardwood pulp production. ENA-2048 combines several mechanism to improve deresination:

1) It improves penetration of cooking liquor into the chips

2) It helps to disperse and solubilize extractives to increase

their saponification

3) It stabilizes micelles in cooking liquor

4) It prevents adsorption of micelles onto the fibres during

black liquor displacement and washing

New approach – increased tall oil production• One existing customer – SE Enocell

• Produces viscose and has high demand of clean pulp. Has used the product for app. 3 years.

• Several short full scale trials have proven the functionallity but it has been tough to get regular business

• New excel calculation based on theoretical assumptions shows that econimical benifts is huge due to extra production of tall oil

Stora Enso Skutskär• South of Gävle, 160 km

north of Stockholm• Three fiber lines, two

SW lines and one HW line with total annual production of 540 000 ton pulp

Fiber line 3 – birch line (HW)• Continuous singel vessel digester• BSW – 1 filter and 3 presses• Bleaching sequence D0, EOP, D1, D2• Annual production 140 000 ton

Dosage of ENA-2048• Lab and full scale trials have shown that 1 kg of

ENA-2048 is at least as effective as 10 kg of tall oil / rosin soap

• Recommended dosage of ENA-2048 is 2,0-2,5 kg/ton pulp

• The product needs pre dilution with x 20 if dosed to white liquor. No dilution if dosed to black liquor

• SE Skutskär uses 40 kg of tall oil per ton pulp and this was replaced with 2 kg ENA-2048

Dosage point of ENA-2048To black liquor stream mixed with white liquor to C2 circulation

Results – aceton extractives• First trial 3rd to 11th of March• Second trial 24th of March to 3rd of May• SE Skutskärs limit for acetone extract is 0,2 %

Results – tall oil production• January 1638 ton• February 1451 ton• March 1832 ton• April 2062 ton

Betulin – problematic birch resin• In production of birch pulp you always

have more or less betulin present depending on debarking

• Betulin easily creates deposits and is very troublesome to get rid off with conventional dispersing agents

• During reference period before trial betulin content in final pulp was roughly 120 mg/kg

• During trial betulin decreased to a level of 60 mg/kg

Conclusions• Potential is 280 ton ENA-2048 annualy

• 600 KEUR with GM 50%

• Net profit for customer according to Nopco 2500 KEUR per year

• Net profit according to customer 900 KEUR per year

• May will be reference month but responsible engineer will recommend management to prolong the trial for at least three months starting latest middle of June