Use of Pulping Aids

Advanced chemical pulping aids can be added to the pulping process to increase liquor penetration and promote more even cooking. Pulping aids can help increase pulp yields and lead to reduced energy consumption per ton of pulp, reduce raw material inputs, and improve productivity. They can also help reduce pulp rejects and use of bleaching chemicals. The financial viability of this measure is typically determined by comparing the costs of chemicals to the projected fiber savings. Anthraquinone compounds are commonly used as chemical pulping aids, but new alternatives are emerging (Kramer et al., 2009. p.90).

In US DOE supported applications, the use of a chemical called ChemStone OAE-11 has shown to reduce energy consumption, while also increasing yields (2 to 5% per ton of wood), and reducing pulp rejects, use bleaching chemicals and sulphur based emissions. Another pulp aid, phosphonate, is shown to increase lignin removal, improve yield – by 4 to 6% – and bleach brightness, and conserve pulp viscosity, and reduce pulping chemical usage (Kramer et al., 2009. p.90).

Development Status Products
Commercial

Use of Pulping AidsCosts & Benefits

Parent Process: Chemical Pulping
Energy Savings Potential

US flag Energy saving of 0.131 GJ/t-processed wood was reported in one study using a pulping aid named ChemStone OAE-11.

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 With the use of Phosphonate as a pulping aid energy savings of 8 to 10% were reported (Kramer et al., 2009. p.90).

CO2 Emission Reduction Potential
Costs

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 Some studies have suggested savings of around $20 per ton of bleached pulp after the cost of chemicals have been considered (Kramer et al., 2009. p.90). 

Use of Pulping Aids Publications

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