Research on Pulping and Bleaching Performances of Distillers'Grains
This study firstly used distiller's grains as raw material,adopted the sulfate cooking process,and analyzed the effects of alkali dosage,sulfidity,and maximum cooking temperature on pulp yield.Then,using the complete randomalized method,the paper studied the effects of pH value before bleaching on the D0stage,ClO2 dosage,bleaching temperature,and bleaching time on bleaching yield and pulp whiteness,and optimized the D0 stage process using orthogonal method.The results showed that under a liquid ratio of 1∶3(g∶mL),the optimal cooking conditions for distillers'grains were as follows:alkali dosage of 20％,sulfidity of 20％,and maximum cooking temperature of 150 ℃,the pulp yield of 25.1％,potassium permanganate value of 19.8,and whiteness of 19.2％.The optimal process conditions for the D0ED,three-stage bleaching were as follows:for D0 stage,pH value before bleaching of 2.01,ClO2 dosage of 4％,bleaching temperature of 60 ℃,and bleaching time of 30 min,for stage E,alkali dosage of 2％,bleaching temperature of 70 ℃,and bleaching time of 60 min,for stage D1,ClO2 dosage of 1.5％,bleaching temperature of 70℃,and bleaching time of 120 min,the pulp brightness and potassium permanganate value was 57.2％and 1.9,respectively.
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