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Acid and neutral sulfite semichemical pulping of six Arkansas delta hardwoods

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  • Semi chemical pulping processes, using both acid and neutral sul­fite liquors, were ap!)lied to the following six Arkansas Delta hardwoods: black willow, southern cottonwood, American elm, sugarberry, green ash, and bitter pecan. Pulping conditions for yields of 75 to 80 percent were determined and the properties of both the pulps and nine-point boards pro­duced from them were evaluated. The general results were as follows: (1) Both the acid and neutral sulfite processes caused greater lignin removals from willow and cottonwood yet the pulps had lower lignin contents and higher alpha and total cellulose contents than did the pulps from the other woods. (2) The neutral sulfite pulps from willow, cottonwood, and sugar­berry had strength properties superior to those of the pulps from the other woods. (3) The acid sulfite process caused greater removal of lignin and cellulose but less removal of material soluble in 1 percent caustic soda than did the neutral sulfite process. The pulps from the acid process had lower strength values than those from the neutral process. (4) The proper­ties of nine-point corrugating boards made from the neutral sulfite pulps, especially those from willow, cottonwood, and sugarberry, were equal or superior to the properties of many commercial boards. (5) The nine-point boards made from acid sulfite pulps were inferior to those from the neutral sulfite pulps.
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Déclaration de droits
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