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首页> 外文期刊>Turkish Journal of Agriculture & Forestry >Production of dissolving grade pulp from poplar wood by ethanol-water process
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Production of dissolving grade pulp from poplar wood by ethanol-water process

机译：用乙醇-水法从杨木中制取溶解级纸浆

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摘要

The possibilities of dissolving grade pulp production from poplar [Populus canadensis] by an ethanol-water process were investigated. Poplar wood samples were taken from a poplar plantation in Tokat Province, Turkey. The effects of ethanol ratio, cooking temperature and acid catalyst ratio on unbleached, bleached and alkali-purified pulps were studied. It was seen that catalyst ratios exceeding 0.01% caused serious yield and viscosity losses. The results showed that with the catalyst ratio to pulping liquor exceeding 0.01%, pulp yield and viscosity were reduced to an unacceptable level. The best pulping result was obtained at 40% ethanol consistency, 180degC pulping temperature and 150 minutes reaction time without the addition of acid catalyst to the pulping liquor. After bleaching and alkali purification, the pulp obtained had a 30.7% yield, 95.8% alpha-cellulose content, 677 cm3/g viscosity, 83% ISO brightness, 1.80% residual pentosans, 0.33% copper number and 0.14% ash content. However, brightness was increased to 88.5% ISO level with the application of a multistage bleaching (CEHDED) sequence instead of chlorite bleaching without serious losses in yield or alpha-cellulose content at normal viscosity levels. It is concluded that these pulps meet dissolving grade pulp quality requirements.
机译：研究了通过乙醇-水法溶解杨树[Populus canadensis]制成的纸浆的可能性。杨木样品取自土耳其托卡特省的一个杨树人工林。研究了乙醇比，蒸煮温度和酸催化剂比对未漂白纸浆，漂白纸浆和碱提纯纸浆的影响。可以看出，催化剂比例超过0.01％会导致严重的产率和粘度损失。结果表明，当催化剂与制浆液的比例超过0.01％时，纸浆的产率和粘度降低到不可接受的水平。在不向制浆液中添加酸催化剂的情况下，在40％的乙醇浓度，180°C的制浆温度和150分钟的反应时间下可获得最佳的制浆结果。经过漂白和碱纯化后，所得纸浆的产率为30.7％，α-纤维素含量为95.8％，粘度为677cm 3 / g，ISO白度为83％，戊聚糖残留量为1.80％，铜数为0.33％，灰分为0.14％。但是，使用多级漂白（CEHDED）代替亚氯酸盐漂白，亮度增加到了ISO的88.5％，在正常粘度水平下，收率或α-纤维素含量没有严重损失。结论是这些纸浆满足溶解级纸浆质量要求。

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