A Novel Demetalation Process for Vanadyl- and Nickelporphyrins from Petroleum Residue by Photochemical Reaction and Liquid−Liquid Extraction
A Novel Demetalation Process for Vanadyl- and Nickelporphyrins from Petroleum Residue by Photochemical Reaction and Liquid−Liquid Extraction
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DOI：
10.1021/ie990809o
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发表时间：
2000-03
影响因子：
4.2
通讯作者：
Yasuhiro Shiraishi;†. A. Takayuki Hirai;I. Komasawa
中科院分区：
文献类型：
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作者：
Yasuhiro Shiraishi;†. A. Takayuki Hirai;I. Komasawa
研究了一种基于光化学反应和液-液萃取相结合的废油脱金属新工艺。首次研究了采用油/水两相体系的同时光反应和萃取工艺。将四氢化萘中溶解的四苯基卟啉钒(IV)-和四苯基卟啉镍（II）的脱金属结果与实际常压渣油的脱金属结果进行了比较。结果表明，第一种方法可以脱除“游离”型金属卟啉，但难以脱除与渣油中沥青质分子密切相关的“结合”型金属卟啉。为了减弱这种结合，使结合型金属卟啉转化为自由型金属卟啉，在渣油中加入一种供氢极性溶剂2-丙醇并进行光照射。然后通过蒸发除去2-丙醇，得到的残油与HCl水溶液接触，将其溶解到HCl水溶液中。
A novel demetalation process for residue oils, based on a combination of photochemical reaction and liquid−liquid extraction, has been investigated. A simultaneous photoreaction and extraction process, employing an oil/water two-phase system, was first studied. The results for the demetalation, obtained for vanadyl(IV)- and nickel(II)tetraphenylporphyrin dissolved in tetralin, were compared with those obtained for actual atmospheric residue oil. It was found that this first process was able to demetalize “free”-type metalloporphyrins, but had difficulty in the demetalation of “bound”-type metalloporphyrins, which are associated strongly with the asphaltenic molecules in residue oil. To weaken this association and thus convert the bound-type metalloporphyrins to the free-type ones, a hydrogen-donating polar solvent, 2-propanol, was added to the residue oil and photoirradiated. The 2-propanol was then removed by evaporation, and the resulting residue oil was contacted with aqueous HCl solution, into which t...