老化油中金属元素的赋存状态分析研究

采用纯水和盐酸2种试剂对油罐内不同深度的老化油进行了萃取，对萃取后各相中的金属采用电感耦合等离子体发射光谱法进行了定量分析。同时，选取苯甲酸钠、环烷酸钙、四苯基卟啉镍、八乙基卟吩镍、四苯基卟吩氧化钒、八乙基卟吩氧钒6种有机金属化合物作为模型化合物来判断老化油中金属的形态。结果表明：萃取分离后各相中铁、钠、钙等金属元素的含量高且加合性好；由于老化油成分复杂，铁的形态通过酸萃取后的颜色判断应为+2价；老化油回收有望通过水洗和离心的方法，脱除其中的金属，如果需要进一步脱除，考虑采用酸性试剂处理。

ANALYSIS OF METAL SPECIATION IN AGED OIL

Pure water and hydrochloric acid solution were used to extract the aged oils of different depths in the oil tank, respectively. The metal contents in extracted oils were determined by inductively coupled plasma emission spectrometry (ICP-OES). Meanwhile, sodium benzoate, calcium naphthenate, nickel meso-tetraphenylporphine, nickel octaethylporphine, vanadyl meso-tetraphenylporphine, and vanadyl octaethylporphine were employed as model chemicals to study the metal species in the aged oils. The results showed that the contents of iron, sodium, calcium, and other metal elements in each phase were high and followed the rule of additivity after extraction and separation, respectively. The composition of the aged oil was complicated, and the iron in aged oil should be +2 valences according to the color of acid extract. It is expected that the aged oil can be recovered by means of washing and centrifugation to remove most of the metals in it. If further removal is required, acid reagent treatment should be considered.