【摘要】 为了解决琼脂生产废碱液的资源化利用问题，利用扩散渗析装置对琼脂生产废碱液进行碱回收处理，并以料液流速、水/料流速比和温度为考察因素，以碱回收率和回收碱浓度为评价指标，进行3因素3水平的Box-Behnken中心组合实验设计，构建响应曲面模型，分析3个因素之间的交互作用对碱回收率和回收碱浓度的影响，确定扩散渗析法回收废碱液的最佳工艺条件。实验结果表明，当料液流速为0.75 L/(m~2·h)、水/料流速比为1.28、温度为65.5℃时，碱回收率达80%,获得的碱溶液浓度为1.14 mol/L,模型预测值与实验结果接近，模型可靠。这表明，扩散渗析能有效实现碱与有机物的分离，采用响应面法优化扩散渗析回收琼脂生产废碱液工艺是可行的。更多还原

【Abstract】 In order to realize the utilization of waste alkali liquor generated during agar production, a diffusion dialysis device was used to recover alkali from the waste alkali liquor. The feed flow rate, ratio of water to feed flow, and feed temperature were selected as the investigation factors, while the alkali recovery efficiency and alkali concentration were considered as the target variables. A three-factor and three-level Box-Behnken central composite design coupled with response surface methodology was employed to analyze the interaction effects of the three factors on alkali recovery efficiency and alkali concentration. The parameters of response surface were optimized, and the optimum process conditions were feed flow rate of 0.75 L/(m~2·h), ratio of water to feed flow of 1.28, feed temperature of 65.5 ℃,respectively. Under the optimum conditions, the alkali recovery efficiency of 80%,and alkali concentration of 1.14 mol/L could be obtained, and the predicted value of the model fitted well with the experimental results, which indicated the reliability of the model. It showed that diffusion dialysis was a very effective method for the separation of alkali and organic matter, and it is feasible to use response surface methodology to optimize the recovery process of waste alkali liquor from agar production by diffusion dialysis.更多还原