反渗透膜处理维生素C凝结水的最优工艺条件

Optimum technological conditions of reverse osmosis processing VC condensation water

针对维生素C生产工艺中产生的凝结水产量大、处理成本高、存储运输困难和营养物质含量偏低等问题,采用反渗透技术对VC凝结水进行处理。实验建立小试规模反渗透膜处理装置,采用无量纲化多元回归分析方法,分析了操作条件指标与渗透水评价指标两套指标体系之间的关系,定量评价了各个操作条件指标对渗透水评价指标的整体影响程度,并在此基础上研究了最佳操作条件的工艺参数。结果表明:建立的无量纲化多元回归分析方法切实有效,在正交实验设计水平范围内,压力、pH和回流比均是多目标系统的影响因子,操作条件指标对渗透水评价指标的整体影响程度大小顺序为:压力>pH>回流比>温度,且各自影响程度所占比例分别为43.02%、29.01%、25.07%和2.89%。各个操作因子对多指标系统的影响是独立的。在只考虑系统收益而不考虑膜污染的情况下,最佳操作条件分别为:温度T=30.65,压力P=1.5 MPa,回流比r=0.78,pH=7.475。

Problems in the condensate water of vitamin C production project, such as its large amount, diffi- culties in disposal, storage and transport and low nutrients were analyzed in this paper, and the reverse osmosis technology was put forward accordingly. Through setting up the small sale pilot of reverse osmosis technology e- quipment and adopting the dimensionless multiple regression analysis method, relationship between operating con- ditions index and permeate water evaluation index was analyzed based on the batch experiments, the degree of the operating conditions index impacting on the permeate water evaluation indexes was quantitatively evaluated, and based on this research the optimal process parameters of the operating conditions were studied. The results show that the dimensionless multiple regression analysis method is practical and effective. In the range of orthogonal experi- ment design level, the operation pressure, pH and reflux ratio are all remarkable influencing factors of the multi-target system, and the sequence of influence degree size is ：pressure 〉 pH 〉 reflux ratio 〉 temperature ,and the percentages of each factor are 43.02%, 29.01%, 25.07% and 2.89%, respectively. The influence of each operation index on the system is independent. If not to consider the membrane pollution but only the system benefits, the optimal operating conditions are temperature of 30.65℃, pressure of 1.5 MPa, reflux ratio of 0.78 and pH of 7. 475.