渗透汽化膜分离技术用于工业粗1,4-丁二醇溶液脱水的研究
李纲 , 张宸 , 张龑 , 唐宇虹 , 任秀秀 , 钟璟
现代化工 ›› 2026, Vol. 46 ›› Issue (6) : 196 -200.
渗透汽化膜分离技术用于工业粗1,4-丁二醇溶液脱水的研究
Dehydration of industrial crude 1,4-butanediol solutions by pervaporation membrane separation technology
炔醛法生产工艺过程产生的粗1,4-丁二醇(BDO)溶液中含有大量的水需要去除。采用渗透汽化膜分离技术对BDO溶液进行脱水,系统考察了膜重复性、操作温度及测试时间对分离性能的影响规律。随着料液的温度从70℃升高到100℃,膜的通量从1.3 kg/(m2·h)升高到2.6 kg/(m2·h),增至2倍,且重复性较好。温度变高后杂质含量变化较少,而BDO损失率降低。随着渗透汽化时间的进行,原料侧水含量持续降低,而渗透液通量稍有降低,但水含量均在98%(质量分数)以上,化学需氧量(COD)值低于2 500 mg/L。对测试前后的膜进行表征,表明该分子筛膜在高含水量条件下具有优异的长期稳定性。
In the acetylene-aldehyde process,the crude 1,4-butanediol (BDO) solution contains a large amount of water that needs to be removed.Herein,pervaporation membrane separation technology was employed for the dehydration of BDO solutions.The influence of membrane repeatability,operating temperature,and testing duration on separation performance was systematically investigated.As the feed temperature increased from 70℃ to 100℃,the membrane flux rose from 1.3 to 2.6 kg/(m2·h),exhibiting a two-fold increase with favorable repeatability.Elevated temperatures resulted in negligible changes in impurity content,while the BDO loss rate was reduced.Over the test period of pervaporation,the water content in the feed solution decreased continuously,and the permeate flux showed a slight decline.The water content in the permeate remained above 98 wt%,with a chemical oxygen demand (COD) value below 2 500 mg/L.Characterization of the membrane before and after pervaporation testing demonstrated that the zeolite membranes possess excellent long-term stability under high-water-content conditions.
粗BDO溶液 / 脱水 / 渗透汽化 / 膜分离 / 稳定性
crude BDO solution / dehydration / pervaporation / membrane separation / stability
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