Characterization of Thiols in Presweetening and Sweetened RFCC Gasoline Distillate

Abstract

Thiols in RFCC naphthas produced in two refineries in China have been separated and characterized with GC/FPD. The identification results show that there are more than 20 kinds of thiols, including C 3 -C 8 normal thiols, isothiols, thiophenol and methylthiophenol presenting in presweetening RFCC naphthas, while in sweetened RFCC naphthas, only have the isothiols and C 7 -C 8 normal thiols been detected. The content of C 7 -C 8 thiols and isothiols is higher in RFCC naphthas than that in FCC naphthas.

Triarylboron Anchored Luminescent Probes: Selective Detection and Imaging of Thiophenols in the Intracellular Environment

“…Despite their synthetic utility, thiophenols are highly toxic to human beings and the environment. Prolonged exposure to thiophenols induces a burning sensation, coughing, wheezing, laryngitis, shortness of breath, headache, nausea, and vomiting, and at the extreme, can be fatal. − Studies have shown that thiophenols possess a median lethal dose (LC50) of 0.01 to 0.4 mM for fish. − Thus, selective detection and discrimination of thiophenols from biologically important aliphatic thiols is a pivotal area of research. − Numerous thiol sensors have been developed by exploiting their strong nucleophilicity and affinity toward transition metal ions. − Most of the probes are reaction based thiol dosimeters and are constructed by conjugating an electron deficient fluorescence quencher 2,4-dinitrobenzenesulfonyl chloride (DNBS) with a luminophore via sulfonamide bond. The high electron deficiency of the DNBS moiety acts as an electron sink and induces photoinduced electron transfer (PET), resulting in the quenching of fluorescence from luminophore. − …”

Characterization of Heteroatom-Containing Compounds in Thermally Cracked Naphtha from Oilsands Bitumen

“…For most applications it is not necessary to know the compound specific composition of naphtha, but when one wants to develop new technology or troubleshoot an existing unit, compound specific characterization is valuable. Studies that reported detailed naphtha characterization mainly used chromatographic separation in association with analysis using different detectors. − Preseparation can be used to simplify the matrix by grouping specific compound classes together by extracting specific compound classes based on solubility and/or reaction. , Once detailed characterization is available, spectroscopic methods can be used to replace chromatography for analysis, or to provide a more rapid way of tracking groups of compounds in the naphtha . Still, the detailed characterization of naphtha is onerous, because it is a complex mixture.…”