荷电耐污染超滤膜分离、纯化海藻酸钠的研究.pdf

第29卷第1期
海洋通报
Vol. 29. No. I
2010年02月
MARINE SCIENCE BULLETIN
Feb.2010
荷电耐污染超滤膜分离、纯化海藻酸钠的硏究
曾淦宁,沈江南,洪凯,阮慧敏
(浙江工业大学化学「程与材料学院海洋系,浙江杭州310014)
摘要:采用PAN(聚内烯睛)、季胺化的 PAN-CO- DMAEMA、DMF等混溶液制备荷电耐污染超滤膜。在改进消化条件的基備上
对酸凝一酸化法提取海鵔钠的工と做了进?步优化。得到的较佳T.艺条件为:先用1%甲醛浴液浸泡海带4h,用49%NaCO3溶液
常温消化3h后,用盐酸溶液沉淀出海藻鵔,用1%Na2CO3中和海藻酸胶块,再用90mL.浓度为109%的次氯酸钠溶液脱色1h,采
用膜分离技术超滤所后加入无水乙醇析出絮凝状海藻酸钠,最后烘「至恒亜,粉伃得藻酸钠成品。分析结果表明,海藻酸钠性征和
得率均有明显收善。
关键词;荷电超滤;耐污染;海藻酸钠
中图分类号:TS20
文献标识码:A
文章编号:1001-6932(2010)01-0096-05
Separation and purification of sodium alginate by using charged fouling
resistance ultra filtration membrane
ZENG Gan-ning, SHEN Jiang-nan, HONG Kai, RUAN Hui-min
(Deparment of Oceanography, College of Chemical Engineer ng and Materials Science, Zh jiang University of Technology, Hangzhou 310014, China)
Abstract: Based on the improved digestion conditions, the ultra filtration technology was used to optimize the
traditional acid condensate-acidification in ex raction of the sodium alginate from the kelp Membrane prepared from
the mixed solution of PAN, PAN-CO-DMAEMA, DMF could be resistant to higher pollution than the conventional
PAN membrane. The optimum conditions combined with the UF technology could be described as: firstly, soak kel
four hours with 1% formaldehyde solution; secondly, digest the sample with 4% Na CO solution at room temperature
3 hours; thirdly, precipi ate to get the alginate with hydrochloric acid; fourthly, antacid the alginate blocks by using
1% Na CO fifthly, decolorize with 10% sodium hypochlorite for one hour; sixthly, ultra filtration membrane
separation technology was included be ore adding ethanol to get the flocculation-alginate: lastly, the final alginate
products was got by drying and smashing. The results showed that the alginate products performance coincided with
the commercial food-grade, and the extraction rate was improved greatly than the conventional technology
Keywords: Charged ultrafiltration Pollution-resistant; Sodium alginate
海滐酸钠( Sodium Alginate, Naalg)是从祸藻类的海带或尾藻中提取的·种多糖碳水化合物,是由
1,4-聚-B-D-甘露粘隆酸和a-L-古罗糖隆酸组成的一种线型聚合物。海藻酸钠以良好的生物降解性和生物相
溶性,被广泛应用于化学、生物、医学、食品等领域,其传统工艺提取方法主要包括酸凝一酸化法,钙凝
一酸化法,钙凝一离子交换法及酶解法等川。膜分离、电渗析、超临界等现代分离技术的出现丰宮了海藻
酸钠的提取手段,提高了其得率。但对海藻酸钠而言,由于其自身良好的増稠性、成膜性、絮凝性和螯合
性等特点,在使用膜分离技术时极易产牛膜通量减和分离特性的不可逆变化等膜污染现象,严重影响了
膜过程的技术可行性和经济成本2到。膜污染的主要表现是被分离物质易于吸附于膜表面和膜孔内,导致膜
孔堵塞或机械截留作用。日前,膜污染成为限制膜进一步扩大应用的瓶颈。因此,在膜科学领域,膜污
染过程、膜污染机理及其解决方法的研究受到越来越多的关注(?。
本文主要探讨了利用荷电耐污染超滤膜对酸凝一酸化法进行改进,并通过验研究验证了其分离、纯
收稿日期:2009-04-07;修订口期:2009-10-19
基金项H:浙江省农业财政项?“以海定陆,海陆联动”海洋污染监挖机制研究;卫星海浒环境动力学国家重点实验室开放课敗( SOEDO608)
化材学院教改攻口“海洋投术专业培养体系的改革与实践”课资助
作者简介;曾淦宁(1977ー)男,江西省新干县人,博士,研究方向:海洋环境科学。电子郎箱: gnzeng(azjut.edu.cn
万方数据