reason there is a strong economical incentive to increase the use of semi chemical pulp the semi chemical pulp mill was designed to process 500 tons day but is used to process 550 575 tons day and consequently is short of cooking liquor the mill uses green liquor to cook the chips for about 22 5 minutes the cooked chips are then refined and washed a product comprised on an active basis of an aqueous solution containing 10 pluronic l 62 and 7 1 2 pluronic f 108 was added to the wood chips prior to cooking at a rate of about 2 lb ton based on the pulp production the mill produced green liquor semi chemical pulp utilizing wood chips being pulped at the following conditions at 2 62 horsepower day hpd ton the typical refining energy of the mill the percentage of rejects before treatment with the composition of the present invention was 8 7 after treatment with the present invention the percentage of rejects was 7 2 this 1 5 reject reduction based on pulp was equivalent to a 17 reduction based on rejects the lower reject levels indicated that the chips were better penetrated by green liquor the refining energy at both pulp mill and paper mill was lower during the trial ______________________________________ pulp paper mill mill overall______________________________________pre trial 2 62 7 39 10 01trial 2 35 5 61 7 96difference 2 05 hpd ton______________________________________ the refining energy saving of 2 05 hpd ton was estimated to be about 300 000 year the refining energy reduction was.