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Kraft Pulping Integrated with Mild Alkaline Pre-Extraction of Southern Mixed Hardwoods

机译：牛皮纸浆与南方混合硬木的轻度碱预提取相结合

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Fresh southern mixed hardwood chips were extracted with alkaline solutions containing sufficient alkalinity to approximately neutralize the acids released upon treatment of the chip-liquor mass at various elevated temperatures. The effect of alkali charge in the form of NaOH, Na_2CO_3 or green liquor and the time and temperature of the pretreatment on the extract yield and composition was investigated. The mild alkaline extraction with 3% NaOH or 3% Na_2CO_3 at 140°C and 90 minutes led to the removal of about 6 -8% of wood substance from the hardwood chips. When the extracted chips were pulped at different reduced effective alkali charges (12-13% EA), the pulp yield was approximately 1% lower than that of the kraft control at 155% EA. A modified pre-extraction by addition of 0.05% AQ with 3% Na_2CO_3 or 3% GL, however, increased the yield increase by up to about 1% higher than conventional kraft pulp. No significant difference in paper strength was found in handsheet tests except for a minor change in tear resistance.
机译：用含有足够碱度的碱性溶液萃取新鲜的南部混合硬木片，以大致中和在各种升高的温度下处理木片-液体块时释放的酸。研究了NaOH，Na_2CO_3或绿液形式的碱加料以及预处理的时间和温度对提取物收率和组成的影响。在140°C和90分钟下用3％NaOH或3％Na_2CO_3进行温和的碱萃取导致从硬木屑中去除了大约6 -8％的木质物质。当以不同的减少的有效碱量（12-13％EA）将提取的木片制浆时，纸浆得率比155％EA的牛皮纸对照低约1％。通过添加0.05％AQ和3％Na_2CO_3或3％GL进行的改良预萃取，比传统的牛皮纸浆提高了约1％的收率。在手抄纸测试中，发现纸张强度没有显着差异，只是抗撕裂性略有变化。

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