【摘要】 本论文以工业级木质素磺酸钠为实验对象,采用热重分析、原子吸收、多功能膜、超高效聚合物色谱等方法测定木质素磺酸盐的热性能、磺酸盐组成含量、膜分离后产物的分子量分布。分析结果表明,木质素磺酸盐中主要含有钠和钾离子,每1 g质素磺酸钠中含有钠、钾以及用SO3H-表示的磺酸根三种离子的物质的量分别为2.138 mmol、0.197 mmol、2.348 mmol,即每1 g木质素磺酸钠中主要含有磺酸钠222.35 mg、磺酸钾23.64 mg,占木质素磺酸钠的24.7%。采用多功能膜分离技术分离木质素解聚产物获得了很好的分离效果,其中分子量3500到15000及15000以上的两个截留产物,主要为木质素解聚后的产物;3500到600~800以及600~800以下的截留产物,初步推断主要是半纤维素的水解糖类。更多还原

【Abstract】 The sulfonate composition of the industrial grade sodium lignosulfonate was analyzed and determined using Thermal Gravimetric Analysis,Multi-function Membrane,Atomic Absorption methods and advanced polymer chromatography. Analysis results showed that sodium lignosulfonate mainly contained sodium and potassium cations. Molar contents of the three ions including sodium,potassium and SO₃^2- in each gram of sodium Lignosulfonate were 2. 138 mmol,0. 197 mmol,2. 348 mmol,respectively. Thus there were 222. 352 mg of sodium sulfonate and 23. 64 mg of potassium sulfonate within 1gram of lignosulfonate,about 24. 7wt % in total sodium lignosulfonate. Membrane separation experiment showed that products were well separated into four fractions. Two fractions of molecular weight of 3500 to 15000 and more than15000 presented major characteristic peaks of lignin related to depolymerized lignosulfonate; while that of fractions with low molecular weight of 3500 to 600-800 and less than 600-800 mainly presented characteristic peaks of residual sugars from the hydrolysis of semi-cellulose.更多还原