Estimation on the Economic Impact and the Environmental Conservation Impact Brought by SAQ™ Cooking

Abstract

The use of SAQ is more selective for carbohydrates stabilization and delignification. It is economically more attractive due to the increase of pulp production. In this report, the economic impact and the environmental conservation impact by using SAQ as a cooking additive was studied for a Japanese kraft pulp mill which LBKP production capacity is 1,000 tons⁄day.
At first, the cost-benefit as an economic impact by SAQ was estimated. When the merit by SAQ (reduction of active alkali and increase of pulp yield) and the demerit by SAQ (decrease of energy generation caused by the reduction of organic solid in black liquor) were calculated for this model pulp mill, it could obtain cost-benefit definitely by SAQ usage.
At second, the raw material wood chip saving was estimated as an environmental conservation impact by SAQ usage. As a result, it is estimated to be about 11,700 tons⁄Y in this model pulp mill. Furthermore, the reduction of carbon dioxide emissions in the procurement of wood chip saving was estimated to be about 3,900 tons⁄Y. Thus, kraft cooking using SAQ has economic and environmental advantages comparing to the original kraft cooking.