Abstract: 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 (CH2O)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.
卫达. 环氧乙烷装置聚合物分析及改性分子筛脱醛研究[J]. 现代化工, 2022, 42(6): 216-220.
WEI Da. Analysis on polymers in ethylene oxide plant and study on removal of aldehyde by modified molecular sieve. Modern Chemical Industry, 2022, 42(6): 216-220.