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Formation of thiophenic species in FCC gasoline from H_2S generating sulfur sources in FCC conditions

机译：在FCC条件下由H_2S产生硫源在FCC汽油中形成噻吩类物质

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摘要

Sulfur contamination of a bio-gasoline produced from very low sulfur soybean oil in a circulating pilot riser led to the investigation of the H_2S-olefln recombination pathway by which any sulfur source capable of producing H_2S in the FCC riser could in principle produce all of the typical thiophenic species present in the FCC cracked naphtha. The H_2S-olefln recombination mechanism was confirmed in the laboratory by cracking ultra-low sulfur diesel spiked with 2 wt% dymethyl-dysulfide (DMDS) in a Short Contact Time Resid Test reactor to produce 60-80 ppm gasoline, in which the typical cracked naphtha sulfur species were major components. DMDS cracked to produce methyl-mercaptan and H_2S as primary products, which continued to react with hydrocarbons derived from the diesel oil cracking to produce the intermediates and final products in the reaction pathway. When the reaction was repeated with catalyst containing 10% of a commercial gasoline sulfur reduction additive, the sulfur in gasoline was reduced by 40% and the sulfur in the spent catalyst went from very low levels, when no additive was used, to 0.5 wt% with the additive. The importance of the recombination pathway and the catalyst additive activity in interfering with the pathway by acting as an H_2S scavenger may explain the functional mechanism of ZnO based gasoline sulfur reduction additives.
机译：循环中试提升管中由极低硫大豆油产生的生物汽油的硫污染导致对H_2S-烯烃复合途径的研究，通过该途径，任何能够在FCC提升管中产生H_2S的硫源原则上都可以产生所有FCC裂解石脑油中存在典型的噻吩类物质。在实验室中，通过在短接触时间渣油测试反应器中裂解掺有2 wt％二甲基二硫醚（DMDS）的超低硫柴油以生产60-80 ppm的汽油，从而证实了H_2S-烯烃的重组机理。石脑油中的硫是主要成分。 DMDS裂解产生的主要产物为甲基硫醇和H_2S，它们继续与柴油裂解产生的烃类反应，在反应路径中产生中间体和最终产物。当用含有10％的工业汽油减硫添加剂的催化剂重复反应时，汽油中的硫减少40％，废催化剂中的硫从不使用添加剂时的极低水平降至0.5 wt％与添加剂。重组途径的重要性和催化剂添加剂活性通过充当H_2S清除剂而干扰该途径，可以解释ZnO基汽油减硫添加剂的功能机理。

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  • 来源
    《Fuel》 |2014年第4期|65-71|共7页
  • 作者

    William Richard Gilbert;

  • 作者单位

    PETROBRAS S.A./CENPES, Research & Development Centre, Av. Horatio Macedo, 950, Cidade Universitaria, Quadra 7, 21941-915 Rio de Janeiro-RJ, Brazil;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Thiophene; FCC catalyst; H_2S recombination; Sulfur in gasoline;

    机译：噻吩FCC催化剂;H_2S重组;汽油中的硫;

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