摘要
采用"挤出—拉伸—烧结"法制备聚四氟乙烯(PTFE)中空纤维膜,以N-甲基二乙醇胺(MDEA)与哌嗪(PZ)的混合水溶液作为吸收剂,吸收液热再生循环用于膜吸收法去除混合气体中CO2。主要研究PTFE中空纤维膜在吸收CO2的工艺参数(进气流量、吸收液流量、吸收液热再生温度、吸收液物质的量比)对去除CO2过程中传质性能的影响。结果表明:增加气体进气流量会提高CO2气体传质速率,但会降低脱除率;增加吸收液流量、热再生温度会使传质速率与脱除率均增加,但达到一定程度后增加明显趋缓。吸收液MDEA与PZ的物质的量比接近1∶1时,其吸收效果优于其他的量比。
Polytetrafluoroethylene（PTFE）hollow fiber membranes are prepared through paste extrusion-stretching-sintering processes.In this paper,mixed water solution of methyldiethanolamine（MDEA）and piperazidine（PZ）is chosen as absorbent and PTFE hollow fiber membrane module is adopted as absorbing equipment to remove CO2 from mixed gas of CO2/air.The effects of the process parameters of absorbing CO2 by PTFE hollow fiber membrane（gas flow rate,absorbent flow rate,absorbent thermal regeneration temperature,absorbent concentration ratio）on mass transfer property in the process of CO2 removal.The results show that the increase in the gas flow rate can improve CO2 mass transfer rate,but will reduce the removal rate;the rise in absorption flow rate and thermal regeneration temperature can improve CO2 mass transfer rate and the removal rate,but the rise significantly slows after reaching a certain degree.When the concentration ratio of MDEA and PZ approaches 1∶1,the absorption effects are better than other concentration ratios.
出处
《浙江理工大学学报（自然科学版）》
2015年第4期487-491,共5页
Journal of Zhejiang Sci-Tech University(Natural Sciences)
基金
国家科技支撑计划项目(2013BAC01B01)
浙江省重大科技专项重大社会发展项目(2013C01055)
浙江省高校重中之重学科开放基金(2014KF05
2014YXQN03)
关键词
PTFE中空纤维膜
传质速率
脱除率
热再生
CO2
PTFE hollow fiber membrane
mass transfer rate
removal rate
thermal regeneration
CO2
