Aqueous sodium hydroxide solutions are extensively used as solvents for lignin in kraft pulping. These are also appealing systems for cellulose dissolution due to their inexpensiveness, ease to recycle and low toxicity. Cellulose dissolution occurs in a narrow concentration region and at low temperatures. Dissolution is often incomplete but additives, such as zinc oxide or urea, have been found to significantly improve cellulose dissolution. In this work, lignin was explored as a possible beneficial additive for cellulose dissolution. Lignin was found to improve cellulose dissolution in cold alkali, extending the NaOH concentration range to lower values. The regenerated cellulose material from the NaOH-lignin solvents was found to have a lower crystallinity and crystallite size than the samples prepared in the neat NaOH and NaOH-urea solvents. Beneficial lignin-cellulose interactions in solution state appear to be preserved under coagulation and regeneration, reducing the tendency of crystallization of cellulose.

氢氧化钠水溶液广泛用作牛皮纸制浆中木质素的溶剂。由于价格低廉、易于回收和低毒性，这些也是用于纤维素溶解的有吸引力的系统。纤维素溶解发生在狭窄的浓度区域和低温下。溶解通常是不完全的，但已发现添加剂，如氧化锌或尿素，可以显着改善纤维素的溶解。在这项工作中，木质素被探索为一种可能的有益于纤维素溶解的添加剂。发现木质素可改善纤维素在冷碱中的溶解，将 NaOH 浓度范围扩大到较低的值。发现来自 NaOH-木质素溶剂的再生纤维素材料比在纯 NaOH 和 NaOH-尿素溶剂中制备的样品具有更低的结晶度和晶粒尺寸。