COMPARATIVE ANALYSIS AND ORIGINATION OF PHENOL AND THIOPHENOL DERIVATIVES IN COKER NAPHTHA AND DIESEL

Abstract

Abstract: The extractable acidic compounds were obtained by extracting delayed coking naphtha and diesel from different sources with 20% NaOH. These extractable acidic compounds were analyzed by gas chromatography–mass spectrometry (GC-MS). The results show that the extractable acidic compounds in coker naphtha contain thiophenols and small molecule thiols in addition to phenols. Differs from coker naphtha, almost all extractable acidic compounds in coker diesel are phenols. Excellent linearity between the thiophenols content (y) in coker naphtha and the sulfur content (x) in the corresponding vacuum residue feedstock is observed [y =0.04x–0.005 06 (R2=0.999)]. The higher content of thiophenols in coker naphtha, the worse its storage stability at room temperature. The stability of the coker naphtha is greatly improved after caustic wash. The origin of phenols may be related to the hydrolysis of aryl ether bond and the oxidative decarboxylation of aromatic acids in the delayed coking process. The thiophenols may come from the reaction of the phenols with H2S at high temperature.

Key words: coker gasoline, coker diesel, phenols, thiophenols

CLC Number:

References

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