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Cellulose slurry treating systems for adding AQ to a cellulose slurry in the substantial absence of alkali
Cellulose slurry treating systems for adding AQ to a cellulose slurry in the substantial absence of alkali
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机译:用于在基本不存在碱的情况下向纤维素浆液中添加AQ的纤维素浆液处理系统
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摘要
Chemical pulp is produced from a slurry of comminuted cellulosic fibrous material using a beneficial additive such as AQ, or polysulfide. In the first treatment zone the effective alkali concentration and temperature conditions are such so that substantially no alkali degradation of the cellulose occurs, but so that the material is effectively impregnated with the additive. Then the material is treated with an alkaline cooking liquor, at cooking temperature, to produce a chemical cellulose pulp with higher yield or strength than if the low temperature, low alkali, additive pretreatment was not practiced. Typical alkali and temperature conditions in the first zone are less than 10 g/l expressed as NaOH; and between about 80-130° C., e.g. about 80-110° C. The first zone is preferably a feed system (which may include a separate impregnation vessel) for a continuous digester, while cooking is in a continuous digester.
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机译:化学纸浆是使用有益的添加剂(例如AQ或多硫化物)从粉碎的纤维素纤维材料的浆液中生产的。在第一处理区中,有效的碱浓度和温度条件是这样的,使得纤维素基本上不发生碱降解,但是材料有效地被添加剂浸渍。然后,在蒸煮温度下用碱性蒸煮液对材料进行处理,以生产出化学纤维素纸浆,与未进行低温,低碱和添加剂预处理的情况相比,具有更高的产量或强度。第一区的典型碱和温度条件小于10 g / l(以NaOH表示);在大约80-13度之间; C.,例如大约80-11° C.第一区域优选是在连续蒸煮器中进行烹饪时用于连续蒸煮器的进料系统(其可以包括单独的浸渍容器)。
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