Department of Chemical Engineering, Lakehead University, Thunder Bay, Ontario, Canada P7B 5E1.
Carbohydr Polym. 2013 Feb 15;92(2):2103-10. doi: 10.1016/j.carbpol.2012.11.046. Epub 2012 Nov 28.
In this work, the adsorption of lignocelluloses of pre-hydrolysis liquor (PHL) on precipitated calcium carbonate (PCC) was studied in the presence of poly diallyldimethylammonium chloride (PDADMAC) or cationic polyacrylamide (CPAM). The results revealed that adding PCC to PHL and subsequently adding cationic polymers to PHL/PCC systems was more effective than adding cationic polymers to PHL and then adding PCC to the cationic polymer/PHL systems. At the same dosage applied, PDADMAC resulted in a higher adsorption of lignocelluloses on PCC than CPAM did due to its higher charge density. The adsorption of lignocelluloses on PCC reached its maximum in 3h, and a high temperature reduced the adsorption level as the adsorption was an exothermic process. The maximum adsorptions of 530 mg/g oligo-sugars, 203 mg/g lignin and 58 mg/g furfural on PCC were achieved via adding 0.8 mg/g PDADMAC2 (i.e. higher MW PDADMAC) to PCC/PHL system.
在这项工作中，研究了聚二烯丙基二甲基氯化铵（PDADMAC）或阳离子聚丙烯酰胺（CPAM）存在下，预处理水解液（PHL）的木质纤维素在沉淀碳酸钙（PCC）上的吸附。结果表明，将 PCC 添加到 PHL 中，然后将阳离子聚合物添加到 PHL/PCC 系统中，比将阳离子聚合物添加到 PHL 中，然后将 PCC 添加到阳离子聚合物/PHL 系统中更有效。在相同的用量下，由于 PDADMAC 的电荷密度更高，因此它在 PCC 上吸附木质纤维素的效果高于 CPAM。木质纤维素在 PCC 上的吸附在 3 小时内达到最大值，升高温度会降低吸附水平，因为吸附是一个放热过程。通过向 PCC/PHL 系统中添加 0.8mg/g PDADMAC2（即更高 MW 的 PDADMAC），可以在 PCC 上实现 530mg/g 寡糖、203mg/g 木质素和 58mg/g 糠醛的最大吸附。
