Gutiérrez Ana, del Río José C
Instituto de Recursos Naturales y Agrobiología, CSIC, Seville, Spain.
Bioresour Technol. 2005 Sep;96(13):1445-50. doi: 10.1016/j.biortech.2004.12.008. Epub 2005 Feb 5.
The composition of pitch deposits occurring in pulp sheets and mill circuits during soda/anthraquinone pulping and elemental chlorine-free pulp bleaching of bast fibers of industrial hemp (Cannabis sativa) was studied. Pitch deposits were extracted with acetone, and the extracts analyzed by gas chromatography (GC) and gas chromatography/mass spectrometry (GC/MS). Acetone extracts (15-25% of pitch deposits) were constituted by the defoamers used at the mill and by lipophilic extractives from hemp fibers. Acetone-insoluble residues (75-85% of pitch deposits) were analyzed by pyrolysis-GC/MS in the presence and absence of tetramethylammonium hydroxide. These residues were constituted by salts of fatty acids (arising from hemp fibers) with calcium, magnesium, aluminum and other cations that were identified in the deposits. It was concluded that inappropriate use of defoamer together with the presence of multivalent ions seemed to be among the causes of hemp extractives deposition in the pitch problems reported here.
研究了在工业大麻（大麻属）韧皮纤维的烧碱/蒽醌制浆和无元素氯漂浆过程中，纸浆板和制浆回路中出现的树脂沉积物的组成。用丙酮提取树脂沉积物，并用气相色谱（GC）和气相色谱/质谱（GC/MS）分析提取物。丙酮提取物（占树脂沉积物的15-25%）由工厂使用的消泡剂和大麻纤维中的亲脂性提取物组成。通过在有和没有氢氧化四甲铵的情况下进行热解-GC/MS分析丙酮不溶性残渣（占树脂沉积物的75-85%）。这些残渣由脂肪酸（来自大麻纤维）与沉积物中鉴定出的钙、镁、铝和其他阳离子形成的盐组成。得出的结论是，消泡剂使用不当以及多价离子的存在似乎是此处报道的大麻提取物在树脂问题中沉积的原因之一。
