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Deep desulphurization of gasoline and diesel fuels using non-hydrogen consuming techniques

机译：使用非氢消耗技术对汽油和柴油进行深度脱硫

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Desulphurization of FCC gasoline and diesel fuels has been investigated by chemical oxidation of sulphur containing compounds with hydrogen peroxide in the presence of an acid catalyst such as formic acid and acetic acid, followed by extraction of the oxidized compounds using acetonitrile. Oxidative desulphurization (ODS) of diesel fuel was found to be very promising approach for the reduction of up to 92 percent of sulphur at low temperature (50 deg C) and atmospheric pressure. The direct extraction of diesel oil without any oxidation has resulted in about 45 percent sulphur removal, however such direct extraction also removed other aromatic hydrocarbons and affected the yield. The ODS is not successful with FCC gasoline due to the high olefinic content that tends to react with hydrogen peroxide to form epoxides. GC-MS technique was used to identify the sulphones during the oxidation of thiophenes. This study recommends that the oxidation extraction technique be used as an additional process to the hydrodesulphurization to enable the refiners to meet the future environmental sulphur regulations. The conventional hydrodesulphurization can be used to lower the sulphur content to few hundreds ppm. Then, the oxidation/extraction approach needs to be used to go for ultra-deep desulphurization as it may provide better mean and cost effective way in order to meet the future sulphur environmental requirements.
机译：通过在酸性催化剂（如甲酸和乙酸）存在下用过氧化氢对含硫化合物进行化学氧化，然后使用乙腈萃取氧化化合物，研究了FCC汽油和柴油燃料的脱硫方法。发现柴油的氧化脱硫（ODS）是在低温（50摄氏度）和大气压下还原多达92％的硫的非常有前途的方法。直接提取柴油而未进行任何氧化可除去约45％的硫，但是这种直接提取也可除去其他芳烃并影响产率。由于FCC汽油的高烯烃含量往往会与过氧化氢反应形成环氧化物，因此ODS不能成功。 GC-MS技术用于噻吩氧化过程中的砜。本研究建议将氧化萃取技术用作加氢脱硫的附加工艺，以使精炼厂能够满足未来的环境硫法规。常规的加氢脱硫可用于将硫含量降低至数百ppm。然后，需要使用氧化/萃取方法进行超深度脱硫，因为它可以提供更好的方法和成本效益的方法，以满足未来的硫环境要求。

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