麦芽糖醇的纳滤浓缩

Maltitol concentration by nanofiltration

为了节约能耗,采用D和G 2种纳滤膜对麦芽糖醇进行了提纯和浓缩研究。实验中用G膜去除麦芽糖醇中的多糖醇,用D膜除去山梨糖醇和水分。研究结果表明:渗透液的通量随压力、循环流量和温度的增加而增大,而随物料质量分数的增加而减小;另外,截留率随压力和循环量的增加而增大,而随物料的质量分数和温度的增加而减小。综合考虑操作条件对分离效果的影响,最后确定了适宜的操作条件,对于D膜,操作压力为1.2—1.5 MPa,循环流量60—100 L/h;对于G膜,操作压力为1.0—1.2 MPa,循环流量40—60 L/h,操作温度均为40—45℃。

For energy-saving, two kinds of nanofiltration membranes, type D and type G, were applied to purify and condense maltitol. In the work, membrane G played the role of removing the multi-sugar alcohol in maltitol, and membrane D got rid of sorbitol as well as water. The result shows that the permeate flux increases with improvement of pressure, cycling flux and temperature, and reduces with addition of mass fraction of the material. The rejection rate decreases with accretion of pressure and cycling flux and rises with increment of temperature and mass fraction of the material. The optimun operating conditions were concluded as follows： operating pressure of 1.2-1.5 MPa and cycle flux of 60-100 L/h are for membrane D, and operating pressure of 1.0-1.2 MPa, cycle flux of 40-60 L/ h are for membrane G. The operating temperature for both membranes is 40-45 ℃.