Abstract:

At present, petrochemical resources are subject to challenges such as limited reserves and environmentally unfriendly utilization process. Biomass fuel ethanol can begin to emerge as an alternative energy source. Pervaporation is a way to separate ethanol, which is energy-saving and environmentally friendly. The development of natural highly selective pervaporation membranes has become one of the research hotspots This project proposes to utilize the hydrophilicity and membrane-forming properties of calcium lignosulfonate (CaLS), it was blended with natural polysaccharide sodium alginate (SA) to prepare CaLS/SA blend membranes with different CaLS content. The blend membrane was characterized and analyzed by Fourier transform infrared, X-ray diffraction, contact angle and scanning electron microscope methods. Analysis shows that CaLS and SA are fully and uniformly mixed, and the introduction of CaLS can improve the hydrophilicity of the SA membrane. The effects of CaLS content and operating temperature on the separation performance of ethanol solution with 10% water content were further investigated. The results show that when mass ratio of CaLS/SA is 5%, the separation factor of CaLS/SA blend membrane reaches 2872 and the permeation flux reaches 796g/(m² · h), which is 160% and 70% higher than pure SA membrane respectively, confirming the calcium lignosulfonate application potential in the field of membrane separation.

Key words: sodium alginate, calcium lignosulfonate, membrane, pervaporation, alcohol

摘要：

当前石化资源遇到储量有限、利用过程对环境不友好等挑战，生物质燃料乙醇作为一种替代性能源崭露头角。渗透汽化是一种分离乙醇的方式，节能、环保，开发天然高选择性渗透汽化膜成为研究热点之一。本文提出利用木质素磺酸钙（CaLS）的亲水性和成膜性，将其与天然多糖海藻酸钠（SA）进行共混，制备了不同CaLS含量的CaLS/SA交联膜。采用傅里叶红外、X射线衍射、接触角和扫描电子显微镜等方法对交联膜进行了表征和分析。结果表明，CaLS能与SA充分均匀混合，并且CaLS的加入能提高SA膜的亲水性。进一步考察了CaLS添加量和操作温度对10%水含量的乙醇溶液分离性能的影响，当CaLS/SA质量比为5%时，CaLS/SA交联膜分离因子达到2872，渗透通量达到796g/(m² · h)，较纯SA膜分别提高了160%和70%，证实了CaLS在膜分离领域的应用潜力。

关键词: 海藻酸钠, 木质素磺酸钙, 膜, 渗透蒸发, 醇