a method for the preparation of pulp by means of alkaline cooking , in which method spent liquor is transferred to pressurized tanks , and at least one liquor is expanded corresponding to a temperature difference of 1 to 5 ° c . the generated steam is led to turpentine recovery . thus , the removal of turpentine and gases dissolved in said liquor is effective , the amount of recovered turpentine increases , and pulp of better washability and higher quality is obtained .