两亲磷钨酸盐催化剂的制备及脱硫性能评价
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国家重大科技专项“低渗-致密油藏高效提高采收率新技术”(项目编号2017ZX05009-004),国家自然科学基金“循环激活本 源微生物提高原油采收率的基础研究”(项目编号51574038)


Preparation and Desulfurization Evaluation of Amphiphilic Phosphotungstate Catalyst
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    摘要:

    为了提高氧化剂的氧化脱硫效率,用十六烷基三甲基溴化铵与磷钨酸合成了两亲性杂多酸磷钨酸盐催化 剂(CTAPW),通过红外光谱仪和X-射线衍射仪对产物结构进行了表征,通过模拟油脱硫实验对该催化剂的最优 反应条件进行了研究。结果表明,在反应温度为60 ℃、CTAPW加量为模拟油含硫量的0.8倍、氧化剂H2O2与含 硫量物质的量之比为6、反应时间为1 h的最优条件下,对初始含硫量为500 mg/L、含有二苯并噻吩的模拟油的脱 硫率为96.3%。该催化氧化体系对不同含硫化合物油品有较广的适用性,对含有苯并噻吩或4,6-二甲基二苯并 噻吩模拟油的脱硫率均达到了90%以上。CTAPW是理想的两亲催化剂,长链烷基的接入使该催化剂具有良好 的乳化分散能力,形成较稳定的W/O乳液,促进了油相中硫的有效氧化和分离。

    Abstract:

    In order to improve the oxidation desulfurization(ODS),an amphiphilic heteropolyacid catalyst CTAPW was prepared with hexadecyl trimethyl ammonium bromide(CTAB)and phosphotungstic acid. The product structure was characterized by infrared spectrometer and X- ray diffractometer. And the optimum reaction condition of the catalyst was investigated by desulfurization experiment of simulated oil. The results showed that under the optimum condition,such as 60 ℃,0.8∶1 mass ratio of CTAPW to sulfur content in simulated oil,6∶1 molar ratio of H2O2 to sulfur content,1 h reaction time,the desulfurization rate of simulated oil containing dibenzothiophene with an initial sulfur content of 500 mg/L was 96.3%. The catalytic oxidation system had wide applicability to different sulfur- containing compound oils,and the desulfurization rate of simulated oil containing benzothiophene or 4,6- dimethyldibenzothiophene reached more than 90% . CTAPW was an ideal amphiphilic catalyst. The introduction of long- chain alkyl groups(C16)made the catalyst have good emulsification and dispersion ability. Therefore,a relatively stable W/O emulsion was formed,which promoted the effective oxidation and separation of sulfur in oil phase.

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  • 在线发布日期: 2021-07-06
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