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玉米秆和甜根子草都是农业废弃物。这两种原料中髓的存在(占原料总量的20%～35%)使得蒸煮后的浆料很难达到满意的效果。若想得到较高质量的浆料,就需要在蒸煮前将髓去除。在对玉米秆和甜根子草烧碱-蒽醌法制浆前进行预水解,主要是去除原料中的髓和半纤维素,并以此来生产燃料和化学品。在150℃条件下预水解反应1 h,每吨玉米秆/甜根子草能够溶出50～60 kg糖、28～34 kg木素以及8～22 kg乙酸。与未预水解的原料相比,预水解的原料制浆后细小纤维含量较少,浆料滤水性能提高,撕裂指数较高,但抗张指数较低。为降低化学品用量,需对预水解条件进行优化。采用D0EPD1漂白之后,预水解原料后制得的浆料的得率、强度性能及漂白性能均与未预水解原料制得的浆料相近。
Corn stalks and sweet root grass are agricultural wastes. The presence of pulp in these two raw materials (20% to 35% of the total raw material) makes it difficult to achieve satisfactory results for the cooked pulp. If you want to get a higher quality of the slurry, you need to remove the pulp before cooking. In pre-hydrolysis of corn stalks and sweet root grass soda-anthraquinone pulping, it is mainly to remove the pulp and hemicellulose from raw materials and to produce fuels and chemicals. Under the pre-hydrolysis reaction at 150 ℃ for 1 h, 50-60 kg of sugar, 28-34 kg of lignin and 8-22 kg of acetic acid can be eluted per ton of corn stalk / sweet-root grass. Compared with the non-pre-hydrolyzed raw materials, the pre-hydrolyzed raw materials contained less fine fiber after pulping, the slurry had better drainage property, higher tear index, but lower tensile index. To reduce the amount of chemicals, the prehydrolysis conditions need to be optimized. After D0EPD1 bleaching, the yield, strength performance and bleaching performance of the prepared slurry after prehydrolysis of raw materials are similar to that of the slurry prepared without prehydrolysis.