Tianjin Key Laboratory of Pulp and Paper, Tianjin University of Science and Technology, Tianjin 300457, China.
Bioresour Technol. 2011 Jan;102(2):1264-9. doi: 10.1016/j.biortech.2010.08.049. Epub 2010 Aug 24.
In this paper, we proposed a new modification for an ethanol-based pulping process, which would consist of the pre-hydrolysis (pre-extraction) of wood chips for removing hemicelluloses; the ethanol extraction of pre-hydrolyzed wood chips for removing lignin; and the post purification of cellulose, leading to the production of pure cellulose. We also experimentally evaluated the separation of hemicelluloses from the pre-hydrolysis liquor (PHL) obtained from a pulp mill. To remove lignin from the PHL, it was acidified to a pH of 2, which resulted in 47% lignin precipitation. The lignin separation from the acidified PHL was further improved via adding polyethylene oxide and poly aluminum chloride or adding ethyl acetate. To recover the hemicelluloses from the acidified PHL, ethanol was added to the acidified PHL with a volumetric ratio of 4 to 1. The isolated lignin and hemicelluloses were characterized by a Fourier transform infrared spectroscopy (FTIR) and a gas permeation chromatography (GPC).
在本文中，我们提出了一种基于乙醇的制浆工艺的新改进方案，该方案将包括木屑的预水解（预提取）以去除半纤维素；预水解木屑的乙醇提取以去除木质素；以及纤维素的后纯化，从而生产出纯纤维素。我们还通过实验评估了从纸浆厂获得的预水解液（PHL）中分离半纤维素。为了从 PHL 中去除木质素，将其酸化至 pH 值为 2，导致 47%的木质素沉淀。通过添加聚氧化乙烯和聚氯化铝或添加乙酸乙酯，可以进一步提高酸化 PHL 中的木质素分离效果。为了从酸化的 PHL 中回收半纤维素，将乙醇以 4:1 的体积比添加到酸化的 PHL 中。通过傅里叶变换红外光谱（FTIR）和气相渗透色谱（GPC）对分离出的木质素和半纤维素进行了表征。
