The Comprehensive Utilization Of Pulping Waste Liquor Of Liaoning Poplar’s High Yield Pulping

This paper discusses the comprehensive utilization of pulping waste liquor of Liaoningpoplar’s P-RC-APMP. Discussed respectively the Liquid directly to reuse feasibility, afterwaste liquid treatment to recycle, after the waste liquor of modified to recycle and the ligninin the waste liquor to product activated carbon which can removal coloured substances inwaste liquid,making sure these technology is feasible,then work out the best techniques.Experimental results show that，in P-RC-APMP puiping,the Second stage pretreatmentconditions, Reaction in high concentration conditions mixed waste liquid used for the firststage pretreatment conditions recycled three times for best, little influence on the performanceof paper, even in whiteness, tear index is increased.Extracting the acid accumulator insoluble lignin in P-RC-APMP waste liquor,we can getclarification liquid,then use it as clean water in P-RC-APMP puiping.The dosage ofclarification liquid in the first stage pretreatment conditions is20%, dosage of the Secondstage pretreatment conditions is17.5%,and that in reaction in high concentration conditions is17.5%,latency the pulps with hot water,then we can get the paper with physical index as:brightness62.4%ISO, tear index of23.2mN m2/g, tensile index51.15N m/g.Modified the hemicellulose in the liquor which has been Extracting the acidaccumulator insoluble lignin in the way of Cationic quaternary ammonium modified,Quaternary ammonium groups grafted onto the hemicellulose macromolecular chain,Hemicellulose etherification reaction has taken place,change to quaternary ammoniumcationic hemicelluloses, The best dosage of etherifying agent for the quality of hemicellulose60%, the paper with physical index as: brightness59.5%ISO, tear index of38.4mN m2/g,tensile index61.31N m/g.The best condition of lignin preparation of activated carbon is that：the dosage ofphosphoric acid is50%,the time of dipping is24hours，the time of firing is2hours, the timeof activationradioactivation is15minutes.Using this activated carbon, the absorbancy of theliquor which has been Extracting the acid accumulator insoluble lignin has changed from 0.245to0.078,the decolourization ratio is72.2%,then get the paper with physical index as:brightness68.8%ISO, tear index of25.7mN m2/g, tensile index48.54N m/g.Through the use of solid liquid in waste liquid, theoretically do the full utilization of thewaste liquid, and effectively improving the physical strength of paper, removing the colour ofthe modified liquid which has been made before,improve the brightness of the paper, reducibgthe cost of bleaching, achieving change the waste to the treasure, Zero discharge is done intheory.