摘要
淤浆聚乙烯技术生产过程中存在着溶剂脱蜡的问题.目前常用的溶剂脱蜡工艺为离心固液分离后蒸汽加热气化溶剂正己烷,但这种工艺会造成较大的能源消耗.为降低成本,提出了一种膜分离技术应用于淤浆聚乙烯中溶剂的脱蜡,并基于理论分析与实验证明了这种技术的可行性.结果表明,国产的聚酰胺(PA)复合膜和聚醚砜(PES)膜对石蜡实现了高截留率,分别为95.8%和96.4%.同时溶剂渗透通量分别为18.6和16.3 L/(m2·h),并且,膜材料较好的长期操作稳定性和耐清洗能力,使膜分离技术在淤浆聚乙烯中溶剂脱蜡中的实际应用得到保证.
The production process of slurry polyethylene technology still suffers from the dewaxing problem from a large amount of organic solvents.At present,the common dewaxing method is steam heating of n-hexane after the solid-liquid separation by centrifugation.However,it causes great energy consumption.Here,we proposed a membrane separation technique for solvent dewaxing in slurry polyethylene technology,and then the feasibility of this technique was confirmed based on theoretical and experiment demonstrations.Experimental results demonstrated that domestic polyamide(PA)composite membrane and polyethersulfone(PES)membrane achieved high rejection of 95.8%and 96.4%for paraffin,respectively.Meanwhile,their solvent fluxes reached 18.6 and 16.3 L/(m2·h),respectively.Moreover,the excellent long-term operational stability and cleaning resistance ability further ensured the practical application of membrane separation technology in solvent dewaxing of slurry polyethylene technology.
作者
吕世军
LV Shijun(SINOPEC Shanghai Engineering Company LTD,Shanghai 200120,China)
出处
《化学反应工程与工艺》
CAS
北大核心
2019年第4期349-353,共5页
Chemical Reaction Engineering and Technology
关键词
膜分离
溶剂脱蜡
耐溶剂纳滤
截留率
渗透通量
membrane separation
solvent dewaxing
organic solvent nanofiltration
rejection
permeability
