海带工业中甘露醇的纳滤膜渗滤纯化研究——工艺参数对纳滤提取甘露醇的影响  

Purification and Diafiltration of Mannitol from Kelp Industry by Nanofiltration Membrane --Effects of Process Parameters on Extrating Mannitol by Nanofiltration

作　　者：夏仙兵 蔡邦肖 

机构地区：[1]浙江工商大学食品与生物工程学院膜科学与工程研究所,浙江杭州310035 [2]浙江司大膜工程有限公司,浙江杭州310012

出　　处：《海洋技术》2010年第2期85-89,共5页Ocean Technology

基　　金：国家科技支撑计划资助项目(2007BAD62B05);浙江工商大学研究生创新基金项目(1110XJ1508073)

摘　　要：基于聚酰胺(PA)膜-甘露醇(M)-NaCl体系分离机理的研究,以及纳滤(NF)膜处理海带废水的前期实验,采用中试规模的NF膜分离装置,系统地进行海带废水中M的NF提取工艺实验。结果表明,影响NF膜分离的工艺参数主要是料液中的M浓度和NaCl浓度以及操作压力和操作温度。NF分离单组分M水溶液时,渗透通量(J)较高,M截留率(RM)大于80%。NF分离M-NaCl混合物水溶液时,RM值稳定在75%～80%,J值稳定在13L/m2·h。当料液中NaCl浓度(CF,S)分别为0.2wt%和0.8wt%时,NaCl透过率(SNaCl)分别约达50%和70%。比较两支NF膜组件的渗透性和选择性,1#优于2#。实验结果与优先渗透和空间位阻的集成效应传质机理预测的相一致。这种新型的去除NaCl和浓缩M双重效果的NF工艺,可以为NF膜纯化提取海带工业中甘露醇的工程应用提供实践基础。Based on the study of separation mechanism for a polyamide （PA） membrane-mannitol （M）-NaCl system and the treatment tests of kelp wastewater by nanofiltration （NF） membrane previously, the experiments of extracting process of M in wastewater from kelp production were carried out systematically by means of a setup pilot scale device with NF membrane modules. The results showed that process parameters having effects on NF membrane separation performances were mainly the concentrations of M and NaCl in the feed, operation pressure and temperature. The permeate flux （J） was higher and the M retention was more than 80% when separating M-water solution. The RM of 75～80% and J of 13L/m^2·h were stable while separating M-NaCl mixture solution. The NaCl penetration was about 50% and 70% when NaCl concentration in the feed was 0.2 wt% and 0.8 wt%, respectively. The 1# membrane module was better than 2# membrane module in terms of J and selectivity. The experimental result was consistent with one predicted transport mechanism of integrate effect considered preference penetration and space hinder. The new double NF process of NaCl penetration and mannitol retention in this work offers the practice basis for engineering application of purification and extraction of M in kelp industry.

关 键 词：海带 甘露醇 废水 纳滤 膜分离 纯化 提取 

分 类 号：P74[天文地球—海洋科学] O631.2[理学—高分子化学]