Isopropylation of petroleum pitch and vacuum residue.
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The reactions of petroleum pitch with 2-chloropropane or propylene were carried out using phosphoric acid, sulfuric acid, trifluoromethanesulfonic acid and aluminum chloride as catalysts at temperatures in the range -10 to 200°C. The reactions of vacuum residue with 2-chloropropane were also studied using aluminum chloride catalyst at 25°C.<BR>Isopropylation of petroleum pitch was found to occur in the presence of trifluoromethanesulfonic acid or aluminum chloride catalyst. But phosphoric acid and sulfuric acid did not act as alkylation catalysts under the conditions studied (Tables 2, 3).<BR>H/C atomic ratio, toal weight, content of toluene soluble and content of pyridine soluble in the reaction products increased with increasing degree of isopropylation of petroleum pitch (Fig. 1).<BR>Structural parameters of original petroleum pitch and of its isopropylation products showed that isopropyl groups were introduced to petroleum pitch until about 80% of peripheral carbon atoms of polynuclear aromatic units were substituted by alkyl group (Fig. 2). It was expected that toluene insoluble fraction, which was higher molecular weight in the original petroleum pitch, was converted into toluene soluble fraction by isopropylation.<BR>In the case of Khafji vacuum residue, isopropylation did not proceed even by the use of aluminum chloride, and insolubilization took place instead of solubilization (Figs. 3, 4, 5).
- 一般社団法人 日本エネルギー学会の論文
一般社団法人 日本エネルギー学会 | 論文
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