环氧乙烷装置聚合物分析及改性分子筛脱醛研究  

Analysis on polymers in ethylene oxide plant and study on removal of aldehyde by modified molecular sieve

作　　者：卫达[1] WEI Da(Sinopec Yangzi Petrochemical Co.,Ltd.,Nanjing 210048,China)

机构地区：[1]中国石化扬子石油化工有限公司,江苏南京210048

出　　处：《现代化工》2022年第6期216-220,共5页Modern Chemical Industry

基　　金：中国石化项目(421093-9)。

摘　　要：对某环氧乙烷装置聚合物进行FT-IR红外光谱和X射线荧光光谱分析,结果表明聚合物主要由不同聚合度的(CH_(2)O)_(n)以及微量的Na、K、Cl等杂质组成。采用多种无机多孔材料对环氧乙烷装置部分工段物料进行脱醛处理,其中以改性ZSM-5分子筛脱醛效果最佳。在床层温度25℃、压力1 MPa和空速10 h^(-1)条件下,T320塔流出液经吸附后醛含量由27.47 mg/L降低至4.11 mg/L,并且吸附了3 000倍吸附剂体积后的流出液醛含量仍能保持在6 mg/L以下。对吸附饱和的分子筛进行再生处理,以过热水蒸汽再生后的分子筛脱醛性能与新鲜分子筛相当,可见改性后的分子筛具有较好的吸附脱醛效果。The polymer generated in an ethylene oxide plant is analyzed by means of FT-IR infrared and X-ray fluorescence spectrometer.It is determined that the polymer mainly comprises(CH_(2)O)_(n)with different degrees of polymerization and a few amount of impurities such as Na, K,and Cl.A series of inorganic porous materials are respectively applied as aldehyde-removal adsorbent in some sections of the ethylene oxide plant, and it is shown that the modified ZSM-5 molecular sieve exhibits the best performance in removing aldehyde.Under the conditions of 25℃ in fixed bed, 1 MPa and 10 h^(-1),the aldehyde content in the effluent from T320 tower drops from 27.47 mg·L^(-1)to 4.11 mg·L^(-1)after it is adsorbed by the modified ZSM-5 molecular sieve.The content of aldehyde can be kept below 6 mg·L^(-1)after the modified ZSM-5 molecular sieve has adsorbed 3 000 times of its volume.The adsorption-saturated ZSM-5 molecular sieve is regenerated by superheated steam.The regenerated molecular sieve can reach a similar aldehyde-removal performance with fresh molecular sieve.It is verified that the modified ZSM-5 molecular sieve exhibits a better aldehyde-removal adsorption capability.

关 键 词：环氧乙烷 多聚甲醛 ZSM-5分子筛 脱醛 分子筛再生 

分 类 号：TB321[一般工业技术—材料科学与工程]