摘要
考察了环烷酸铁对油水乳状液稳定性的影响并对老化原油的脱铁机理进行了探讨。实验结果表明:随着乳状液中环烷酸铁含量的增加,乳状液中水滴粒径减小,脱水率降低,水中含油量增大,zeta电位负值增大,乳状液稳定性增强。将聚天冬氨酸与乙酸按质量比1∶1复配,并添加助剂HCl、NaCl及甲醇各50mg/L,均能提高破乳剂BSE-238对老化原油的脱铁率和脱水率。利用偏光显微镜和电导滴定法对破乳脱铁机理进行了探讨,证明加入聚天冬氨酸和破乳剂BSE-238均能促进液滴聚并,降低乳状液稳定性,且络合剂与原油中的铁反应生成一种水溶性的络合物随破乳脱水而除去,使水溶液电导率增加,模拟试验中电导率的变化曲线与推测的络合脱铁机理吻合。
The influence of iron naphthenate on the stability of oil-water emulsion and the iron re-moval mechanism of aging crude oil was studied. Results showed that with the increase of iron naphthe-nate in emulsion, the size of water droplets and water removal rate decreased, oil content in water and the negative value of zeta potential increased, indicating that the stability of emulsion increased. The water and iron removal rates of crude emulsion with BSE-238 demulsifier could be enhanced by adding compound complexing agent of polyaspartic acid and acetic acid （mixed with mass ratio of 1 ： 1） contai-ning 50 mg/L of HC1, NaC1 and methanol respectively. The demulsification and deferrization mechanism was discussed by using polarized light microscopy and conductometric titration. It was found that both polyaspartic acid and BSE-238 demulsifier could promote the aggregation of water droplets and reduce the stability of emulsion. Polyaspartic acid could react with iron in crude emulsion and form an ionic water-soluble complex, which could be further removed with the proceeding of dehydration, resulting in the increase of aqueous solution electrical conductivity. The arranged simulation tests showed that the curve of changing in electrical conductivity was consistent with the suggested iron chelating mechanism.
出处
《石油炼制与化工》
CAS
CSCD
北大核心
2013年第3期36-40,共5页
Petroleum Processing and Petrochemicals
基金
国家科技重大专项课题(2008ZX05011-005)资助
关键词
老化原油
环烷酸铁
ZETA电位
脱铁机理
aging crude oil
iron naphthenate
zeta potential
deferrization mechanism
