共查询到17条相似文献,搜索用时 93 毫秒
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制备了两种磷钼酸季铵盐类相转移催化剂[C16H33(CH3)3N]2[HPMo12O40]和[(CH3CH2)4N]2[HPMo12-O40],以30%的H2O2为氧化剂,易回收、无毒复合溶剂为萃取剂,采用一步氧化萃取脱硫法和两步氧化萃取脱硫法对直馏柴油进行了氧化脱硫研究。结果表明,一步法脱硫效果比两步法好,[C16H33(CH3)3N]2[HPMo12O40]的脱硫效果优于[(CH3CH2)4N]2[HPMo12O40],适宜的反应条件为:O/S比(摩尔比)为8∶1,催化剂用量5%,反应温度40℃,反应时间80 min,萃取剂油比1(体积比),此时直馏柴油的脱硫率为61.3%,收率为95%,催化剂重复使用5次后,脱硫率没有明显下降。 相似文献
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直馏柴油气-液相催化氧化脱硫研究 总被引:4,自引:0,他引:4
由于柴油加氢脱硫技术投资大、操作条件苛刻及污染严重等问题,氧化脱硫技术已成为研究热点。针对柴油H2O2氧化脱硫技术存在氧化剂价格高、柴油收率低和有含硫污水排放等技术经济问题,采用专用的柴油均相催化氧化脱硫催化剂TS-1和纯O2氧化剂,在高压反应釜中对直馏柴油进行催化氧化脱硫,可达到很好的脱硫效果且耗氧量少。实验结果表明,在150 ℃、08 MPa、反应时间60 min和m(催化剂)∶m(柴油)=1 500 μg·g-1的条件下,可将柴油硫含量从2 217.2 μg·g-1降到265 μg·g-1,脱硫柴油硫含量符合欧洲Ⅱ类柴油标准(≤300 μg·g-1),柴油收率达到95.2%。 相似文献
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引 言柴油脱硫技术分为加氢脱硫和非加氢脱硫两大类[1]. 传统的加氢工艺能够满足柴油的低硫要求,但存在装置投资大、操作条件苛刻 (温度>300 ℃,压力>4 0 MPa, 需要氢源) 和操作费用高等技术经济问题. 非加氢脱硫技术在常温或低温、常压和无须氢源条件下操作已受到国内外广泛的重视, 得到很大的发展. 非加氢脱硫技术主要有吸附法[1,2]、萃取法[3,4]、络合法[5]、生物脱硫法[6]、H2O2 氧化法[7,8] 和催化氧化法[9], 其中 H2O2 氧化法已成为国内外的研究热点, 如美国 Petro star公司、日本 PEC、中国石油大学、洛阳石化工程公司等均在大… 相似文献
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《化学工业与工程技术》2016,(1):15-18
介绍了一种以过氧化氢为氧化剂,采用非加氢的方法脱除直馏柴油中硫化物的工艺技术。阐述了直馏柴油深度氧化脱硫的工艺流程与氧化脱硫柴油的工艺指标,考察了氧化剂使用量、反应温度、停留时间、萃取级数等工艺条件对脱硫效果的影响,得到了最佳工艺条件:氧化剂使用量为直馏柴油量(体积)的(10±2)%,反应温度60~70℃,停留时间30~40 min,萃取温度控制在(25±5)℃,采用三级萃取的工艺技术。在最佳工艺条件下,氧化脱硫柴油中硫质量分数小于10μg/g,脱硫率可达到99.7%。 相似文献
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直馏高硫柴油选择性催化氧化-萃取脱硫研究 总被引:1,自引:0,他引:1
对委内瑞拉直馏高硫柴油进行了氧化-萃取脱硫工艺的实验室研究。结果表明,采用H2O2-H3PO4·12WO3氧化反应体系,柴油与H2O2的体积比为2:1,H3PO4·12WO3用量在0.02g/mL以上,十六烷基三甲基溴化铵加入量为0.002g/mL,反应温度为60℃,反应时间30min,用DMF进行3级萃取,剂油比体积比为1:2,脱硫后的柴油中硫的质量分数在0.16%以下,柴油收率为69%-72%,双氧水重复利用4次以上。萃取液中的富硫油可以全部回收. 相似文献
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通过H2O2/HCOOH体系对柴油选择性氧化脱硫技术的研究。考察了H2O2/HCOOH体系反应温度、反应时间、剂油比等因素对氧化脱硫效果的影响。实验结果表明,温度为60℃,反应时间为30min,剂油比为1:15,在反应进行到25min时加入相转移催化剂脱硫率达最大,油脱硫率可达90.0%。 相似文献
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以过氧化氢为氧化剂,甲酸为催化剂,Al2O3为吸附剂,研究柴油氧化吸附脱硫工艺条件。实验结果表明,在n(氧)∶n(硫)=10.0,氧化时间为40min,氧化温度为70℃,V(吸附剂)∶V(油)=1∶5.5,吸附时间为30min,吸附温度为40℃时,吸附柴油的脱硫率为97.32%,柴油w(硫)=20.5μg/g,达到欧洲Ⅳ柴油标准:w(总硫)〈50μg/g。 相似文献
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T.O. Sachdeva 《Fuel Processing Technology》2010,91(9):1133-1138
High sulfur level in diesel fuel has been identified as a major contributor to air pollutant in term of sulfur dioxide (SOx) through diesel fueled vehicles. The main aim of the present work is to develop a promising methodology for ultra deep desulfurization of diesel fuel using oxidation followed by phase transfer of oxidized sulfur. Experiments were carried out in a batch reactor using n-decane as the model diesel compound and also using commercial diesel feedstock. To remove sulfur tetraoctylammonium bromide, phosphotungstic acid, and hydrogen peroxide were used as phase transfer agent, catalyst and oxidant respectively. The percent sulfur removal increases with increasing the initial concentration of sulfur in fuel and with increasing the reaction temperature. Similar trends were observed when commercial diesel was used to carry out desulfurization studies. The amphiphilic catalyst serves as a catalyst and also as an emulsifying agent to stabilize the emulsion droplets. The effects of temperature, agitation speed, quantity of catalyst and the phase transfer agent were studied to estimate the optimal conditions for the reactions. The sulfur removal from a commercial diesel by phase transfer catalysis has been found effective and removal efficiency was more than 98%. Kinetic experiments carried out for the desulfurization revealed that the sulfur removal results are best fitted to a pseudo first order kinetics and the apparent activation energy of desulfurization was 30.6 kJ/mol. 相似文献
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超声波辅助柴油氧化脱硫的研究 总被引:2,自引:0,他引:2
分别以H_2O_2和H_2O_2-CH_3COOOH为氧化剂,采用N,N-二甲基甲酰胺作为萃取剂,在超声波辅助作用下,对柴油进行了脱硫试验,考察了氧化反应时间、温度、剂油体积比、超声频率、超声反应时间对脱硫率的影响。结果表明,以H_2O_2-CH_3COOOH为氧化剂,剂油比8%,超声反应时间10 min,超声频率30 kHz,其脱硫率为89.2%,而未加超声波的脱硫率仅75.8%,说明超声波能提高氧化脱硫效果。 相似文献
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柴油氧化脱硫技术新进展 总被引:1,自引:0,他引:1
柴油低硫化及其含硫标准的日趋严格,是世界各国柴油产品质量与标准的发展趋势。加氢脱硫技术生产低硫柴油,存在投资大、操作费用高和操作条件苛刻的缺点,导致柴油成本大幅攀升,柴油氧化脱硫技术已成为研究热点。综述了国内外柴油氧化脱硫技术的研究进展,认为柴油氧化脱硫技术将成为今后生产超低硫清洁柴油的主要工艺之一。 相似文献
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Evaluation of the oxidation stability of diesel/biodiesel blends 总被引:1,自引:0,他引:1
Biodiesel is an alternative fuel derived from vegetable oils, animal fats and used frying oils. Due to its chemical structure, it is more susceptible to oxidation or autoxidation during long-term storage compared to petroleum diesel fuel. One of the major technical issues regarding the biodiesel blends with diesel fuel is the oxidation stability of the final blend, which is, nowadays, of particularly high concern due to the introduction of ultra low sulphur diesel, in most parts of the EU. This study examined the factors influencing the stability of several biodiesel blends with low and ultra low sulphur automotive diesel fuels. The aim of this paper was to evaluate the impact of biodiesel source material and biodiesel concentration in diesel fuel, on the stability of the final blend. Moreover, the effects of certain characteristics of the base diesels, such as sulphur content and the presence of cracked stocks, on the oxidation stability are discussed. 相似文献
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Deep desulfurization of diesel fuels: kinetic modeling of model compounds in trickle-bed 总被引:2,自引:0,他引:2
Five catalysts with different hydrodesulfurization (HDS) and hydrogenation activity were tested in HDS of fresh crude heavy atmospheric gas oil (HAGO) (1.33 wt% S), two partially hydrotreated HAGO (1100 and 115 ppm S) and two model compounds, dibenzothiophene (DBT) and 4,6-dimethyldibenzothiophene (DMDBT), dissolved in model solvents and HAGO. Aromatic compounds in the liquid decreased significantly the HDS rate of 4,6-DMDBT, especially for catalysts with high hydrogenation activity. H2S displayed a similar inhibition effect with all catalysts. These effects were extremely pronounced in HAGO where the DBT HDS rate decreased by a factor of 10 while 4,6-DMDBT – of 20 relative to paraffinic solvent. The feasibility of using a highly active hydrogenation catalyst for deep HDS of HAGO is diminished by the strong impact of aromatics. 相似文献