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Impact of AQ and Surfactant as pulping aid for Kraft digestions of hardwood and bamboo

AUTHORS
Tripathi S, Mishra OP, Sharma N, Verma P, Chakrabarti SK, and Varadhan R.
Thapar Centre for Industrial Research and Development, Yamuna Nagar, Haryana, India

KEYWORDS
Pulping, yield, pulping aid, hemicelluloses, cellulose, refining, strength properties.

SUMMARY
The impact of using anthraquinone (AQ) and surfactant individually and in combination during kraft pulping of mix hardwoods and bamboo on carbohydrate retention in the pulp, refining behavior and strength properties of unbleached and bleached pulp was studied in the laboratory scale.

Use of 0.05% and 0.1% AQ during pulping increases unbleached pulp yield by 1.1-1.9%, unbleached pulp viscosity by 0.7-1.4 cp and reduces pulp Kappa number by 1.7-2.3 units. Unbleached and bleached pulps produced by using AQ in pulping require 4.2-10.8% lower refining energy.

An addition of surfactant with 0.05% AQ and 0.1% AQ during pulping reduces active alkali charge by 4.0% and 8% respectively to maintain the similar Kappa number of the pulp. AQ in combination with surfactant requires lower active alkali dose and increases unbleached pulp yield by 1.7-2.3%, unbleached pulp viscosity by 1.1-1.8 cp. Unbleached and bleached pulps produced by using surfactant and AQ in pulping requires 6.3%-16.7% lower refining energy.

Pulps produced with AQ and AQ/surfactant in combination showed better physical strength properties particularly double fold, tensile index, tear index and burst index. Other paper properties like smoothness, porosity and stiffness were also improved significantly in comparison to the control pulp.

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