采用吸附固定床脱除正己烷中的吡啶

Removal of pyridine from n-hexane on adsorption fixed bed

以含吡啶的正己烷溶液为模拟含氮油品,采用吸附固定床进行脱氮研究,考察了吸附剂种类、吸附温度、吸附时间、原料油中吡啶用量和LHSV对床层累计吸附容量(Γ)及吡啶的净化率(R)的影响。采用UV-Vis,BET,Py-TPD等方法测定了所用吸附剂的吸光度、比表面积、孔体积、酸性强度等。表征结果显示,吡啶吸附脱除效果受吸附剂比表面积和酸强度共同影响。实验结果表明,采用酸性较强的HAT-097为吸附剂、吸附温度为30℃、吸附时间为100 min、原料中吡啶用量为260 mg/L、LHSV=3 h^(-1)条件下,吡啶的R高达85.1%、吸附剂的Γ可达0.90 mg/g。

The nitrogen removal from n-hexane solution containing pyridine, which was used as a simulated nitrogen-containing oil product, was investigated in an adsorption fixed bed. The effects of adsorbent types, adsorption temperature, pyridine concentration and LHSV on the cumulative adsorption capacity of adsorbents（Г） and the removal of pyridine（R） were researched. The adsorbents were characterized by means of UV-Vis, BET and Py-TPD to measure their specific surface area, pore volume and acid intensity. The characterization results showed that the pyridine removal was influenced by both the specific surface area and the acidity of the adsorbents. It was indicated that, under the conditions of HAT-097 with strong acidity as adsorbent, adsorption temperature 30 ℃, adsorption time 100 min, pyridine concentration in feedstock 260 mg/L and LHSV 3 h-1, R and F could reach 85.1% and 0.90 mg/g, respectively.