MnO-Ag/CaAl_2O_4乙烯脱氧剂性能

Performance of MnO-Ag/CaAl_2O_4 oxygen scavenger for ethylene

比较了还原温度对MnO/CaAl2O4和MnO-Ag/CaAl2O4乙烯脱氧剂脱氧容量的影响;考察了反应温度、反应压力、乙烯空速、乙烯中氧含量对MnO-Ag/CaAl2O4脱氧容量和脱氧后乙烯中残余氧含量的影响以及该脱氧剂重复再生使用时脱氧容量的变化。实验结果表明,MnO-Ag/CaAl2O4脱氧剂的还原再生温度比MnO/CaAl2O4低180℃;MnO-Ag/CaAl2O4脱氧剂在温度25～150℃,压力0.50～3.0 MPa,空速1200～8000 h-1反应条件下,可以将乙烯中氧含量从50～1000μL/L净化至小于0.050μL/L;脱氧容量与反应温度呈正比例关系,在25℃和80℃其脱氧容量分别大于7.0 mL氧/g脱氧剂和11.0 mL氧/g脱氧剂;MnO-Ag/CaAl2O4脱氧剂能够反复再生使用,不会引起乙烯发生聚合、氧化等副反应。

The capacities of removing oxygen in ethylene with MnO/CaAl2O4 and MnO-Ag/CaAl2O4 scavengers at different reduction temperatures were compared. The effects of reaction temperature, pressures, ethylene space velocity, and oxygen concentration in ethylene on the oxygen scavenger capacity and residual oxygen in ethylene of MnO-Ag/CaAl2O4 scavenger were investigated. The reduction temperature for regeneration of MnO-Ag/CaAl2O4 was 180℃ lower than that of MnO-Ag/CaAl2O4. Under the testing conditions： reaction temperature 25-150℃, ethylene pressure 0.50-3.0 MPa, space velocity 1200-8000 h^-1, oxygen in ethylene could be removed from 50-1000 μL/L to below 0.050 μL/L by MnO-Ag/CaAl2O4. The oxygen removing capacities of MnO-Ag/CaAl2O4 were more than 7.0 mL/g and 11.0 mL/g at temperature 25℃ and 80 ℃, respectively. MnO-Ag/CaAl2O4 could be regenerated many times and would not lead to polymerization, oxidation and other by-products of ethylene.