研究报告
何杰,单鹏飞,张莉莉,秦英杰.气态膜吸收分离二甲胺水溶液的研究[J].环境科学学报,2012,32(10):2360-2365
气态膜吸收分离二甲胺水溶液的研究
- Removal of dimethylamine from aqueous streams by hollow-fiber-supported gas membrane
- 基金项目：
- 作者
- 单位
- 何杰
- 天津大学化工学院, 天津 300072
- 单鹏飞
- 天津大学化工学院, 天津 300072
- 张莉莉
- 天津大学化工学院, 天津 300072
- 秦英杰
- 1. 天津大学化工学院, 天津 300072;
2. 天津凯铂能膜工程技术有限公司, 天津 300308
- 摘要：利用自制的高效中空纤维膜组件,通过气态膜吸收法分离二甲胺水溶液.在本实验范围内,把总传质系数和二甲胺脱除率作为评价因素,对影响传质效果的3个因素进行了正交实验.从实验数据可以看出,进口温度升高使得总传质系数与脱除率增大,流速增大使得脱出率下降而总传质系数增大,初始进口浓度对总传质系数与脱除率影响不大.单因素实验得出传质效果最佳的条件为:二甲胺溶液进口温度为45℃,二甲胺溶液流速为0.08m·s-1,二甲胺溶液初始进口浓度为3000×10-6.结果表明二甲胺溶液进口温度是最显著的影响因素,二甲胺溶液流量的影响次之,二甲胺溶液初始进口浓度影响不显著.通过膜组件稳定性实验,了解到膜组件运行550h性能依然很高.
- Abstract：Separation of dimethylamine from the aqueous solution was carried out by using a supported-gas-membrane absorption method with the hollow-fiber membrane modules.In this paper,three experimental conditions affecting mass transfer were investigated trough an orthogonal experiment,and the effects of two factors,including overall mass transfer coefficient and the rate of dimethylamine removal,were evaluated.It can be found that the two evaluation factors increases with increasing the feed temperature,whereas with increasing the feed velocity,the overall mass transfer coefficient increases and the rate of dimethylamine removal decreases.The effect of feed-in concentration of dimethylamine on the overall mass transfer coefficient and the rate of removal are not significant.The best experimental conditions were obtained by single-factor experiments with a feed temperature of 45℃,a feed velocity of 0.08 m·s-1 and a feed-in concentration of 3000×10-6.These results demonstrate that among the three experimental conditions,feed temperature is the most influential factor on the separation process,followed by the feed velocity.The feed-in concentration affected the system negligibly.Through a stability test,it can be seen that the properties of the membrane modules still remain very high after 550 hours run over.
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