活性炭吸附脱除高压聚乙烯装置返回气中丙醛的研究

研究了活性炭吸附脱除高压聚乙烯装置返回气中的丙醛,考察了温度和原料气流速对脱醛率的影响和活性炭吸附丙醛的吸附穿透曲线,同时比较了活性炭在不同脱附方法脱附后再吸附丙醛的情况。实验结果表明,温度对活性炭的脱醛率有影响,30℃时脱醛率最高;在原料气流速为30mL/min时,丙醛的脱除率为70%~90%;活性炭吸附570min后,丙醛的脱除率下降到30%左右;采用120℃水蒸气脱附法,活性炭三次吸附的脱醛率都在95%以上,好于加热氮气吹扫脱附法和加热抽真空脱附法。

Removal of Propanal from High-Pressure Polyethylene Return Gas by Adsorption with Activated Carbon

The removal of propanal from high pressure return gas by adsorbing with activated carbon has been carried out.The effect of temperature and feed gas velocity on the removal rate and breakthrough curve has been studied,and the recycled sorbents by different recycling methods were also evaluated.The experimental results show that removing rate of propanal was the highest at 30℃.The removing rate of propanal maintained between 70%~90%at the feed gas flow of 30mL/min.After active carbon adsorbed for 570 minutes,the removing rate of propanal has dropped to about 30%and reached to its adsorption saturation.The removal rate of propanal was above 95%after recycling activated carbon for 3times at 120℃by steam,which is better method compared with N2-blowing method and heating in vacuum.