共查询到19条相似文献,搜索用时 128 毫秒
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《高校化学工程学报》2020,(3)
传统加氢脱硫往往难以脱除重油中的噻吩类硫化物。利用噻吩类硫化物氧化后的极性增加,在超临界甲醇条件下强化其在极性溶剂中的溶解度,可深度脱除重油中的噻吩硫。以二苯并噻吩(DBT)与十四烷为模型油,甲醇为超临界介质,考察了无催化时反应条件对超临界氧化脱硫性能的影响,不同催化氧化体系的脱硫效率。利用红外光谱、气相色谱-质谱联用对反应产物进行分析以研究脱硫机理。结果表明,在无催化时,反应温度260℃、反应压力8.5~9.0 MPa、反应时间3 h、过氧化二叔丁基作氧化剂且氧硫摩尔比为3:1时,噻吩模型物的脱硫率最高,达42%。在催化氧化体系中,催化剂用量与硫的摩尔比为1:10时催化剂使用效率最高,3种脱硫效果较好的催化氧化体系脱硫率分别达到了47%、45%、45%。FTIR、GC-MS结果表明二苯并噻吩被氧化为相应亚砜并转移至甲醇相,从而实现了硫化物的脱除。 相似文献
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采用浸渍合成法,将磷钨酸负载到微孔-介孔复合分子筛上制备HPWA/HY-SBA-15催化剂。以四丁基溴化铵为相转移催化剂,二甲基亚砜为萃取剂,H2O2为氧化剂,考察HPWA/HY-SBA-15催化氧化脱除FCC汽油含硫化合物的工艺条件。结果表明,反应温度40℃,反应时间90min,HY分子筛占复合分子筛的质量分数为40%,脱硫率可达86.3%。在相同条件下,对比考察了HY、HPWA/HY、HPWA/HY-SBA-15和HPWA/SBA-15催化氧化脱硫的效果,实验证明HPWA/HY-SBA-15催化氧化脱硫的效果最好。 相似文献
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含硫VGO 和CGO 加氢预处理工艺研究 总被引:1,自引:0,他引:1
本文介绍FDS24 和CH220 型催化剂用于含硫V GO 和CGO 加氢预处理制备催化裂化和加氢裂化原料的相关效果, 考察了工艺参数对沙轻V GO 加氢脱硫的影响。试验结果表明, 在中压条件下加氢处理管输CGO , 其脱氮率为7618~ 7810% , 碱性氮脱除率为8319~ 8914% , 脱硫率在95%以上; 加氢处理伊朗V GOöCGO 混合油, 其脱硫率为8816% , 脱氮率为6711%; 含硫V GO 或CGO加氢预处理是优化催化裂化原料、改善其反应性能和扩大加氢裂化原料来源的有效途径。 相似文献
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过渡金属磷化物催化剂具有特殊的晶体结构,在催化加氢脱硫、加氢脱氮及电化学制氢反应中具有优异的催化活性。主要简述过渡金属磷化物催化剂的结构、制备方法和应用。多金属、复合多功能型过渡金属磷化物催化剂将在催化制氢反应中受到更多的关注。 相似文献
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采用共沉淀法制备了SiO_2-TiO_2-ZrO_2三元复合氧化物载体,用浸渍法负载活性组分MoP制备MoP/SiO_2-TiO_2-ZrO_2催化剂。在固定床微反应器上,采用正交实验研究了反应温度、空速、氢油体积比和氢分压对催化剂噻吩加氢脱硫性能的影响,并对劣质催化裂化(FCC)柴油的脱硫性能进行了考察。结果表明,催化剂最佳加氢脱硫条件为:反应温度380℃,空速2 h^(-1),氢油体积比500,氢分压4 MPa,此条件下,FCC柴油脱硫率达97.50%。 相似文献
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TiO2-SiO2复合氧化物的理化性质及其对柴油加氢精制性能的影响 总被引:11,自引:0,他引:11
采用溶胶-凝胶法结合CO2超临界流体干燥技术制备了不同Ti/Si原子比的TiO2-SiO2复合氧化物(TS-n),考察了Ti/Si原子比、焙烧温度对复合氧化物比表面积、孔结构、酸性及原子结合状态的影响,通过重油催化裂化柴油加氢精制反应考察了以TS-1、TS-4为载体的催化剂脱硫性能的差异.结果表明,TiO2经SiO2复合改性后,热稳定性和晶态稳定性大幅度提高;TiO2-SiO2复合氧化物的酸性及原子间的相互作用与Ti/Si原子比有直接的关系;载体的晶态组成及酸性和催化剂的酸性对催化剂的加氢脱硫性能有显著影响,复合氧化物中锐态型TiO2的存在强化了载体与金属组分之间的相互作用,提高了催化剂的加氢脱硫活性,不同类型的酸性中心对柴油中不同类型的硫化物具有不同的脱除能力,Bronsted 酸中心较多的催化剂对结构简单的硫化物脱除能力强,Lewis酸中心较多的催化剂对结构复杂的硫化物有较好的脱除效果. 相似文献
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以介孔氧化钛晶须成型材料为载体,通过浸渍法制备不同MoO3负载量的MoO3/TiO2加氢脱硫催化剂. XRD分析表明,介孔氧化钛晶须成型载体为纯锐钛矿相,MoO3负载量为7.2%(w)的催化剂未出现MoO3的衍射峰;BET分析显示,负载7.2%(w) MoO3后,氧化钛晶须成型载体的比表面积和孔容能保持原来的80%以上. 活性评价结果表明,未经预硫化的MoO3/TiO2催化剂直接应用于二苯并噻吩(DBT)加氢脱硫反应时,在温度280~300℃、氢分压2.0 MPa、体积空速4 h-1、H2/油体积比600的条件下,DBT转化率达100%. 将模型溶液中硫含量由400′10-6 g/g降至10′10-6 g/g以下,催化剂表现出较高的活性,且在一定条件下运行1000 h未出现失活迹象. 相似文献
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The selectivity for hydrodesulfurization over hydrogenation has been examined in a new short residence time catalytic two-stage SRC process, which has the potential of producing a low-sulfur solid SRC product to meet the newly proposed EPA new point source emission standards (NPSES). In the first stage of the process, residence time and hydrogen consumption are minimized through the use of an inexpensive mineral catalyst (SRC residue ash) that has been treated under a combustion environment to improve its selectivity for hydrodesulfurization over hydrogenation. The second stage of the process involves hydrotreating the filtered liquid product with a commercial Co-Mo-Al catalyst, before splitting into a solid SRC and solvent recycle by distillation. Several process variables — such as type of coal, catalyst, temperature, hydrogen partial pressure, and reaction time — have been examined to provide information on hydrogen consumption, product distribution, sulfur removal, SRC yield and solvent quality. The results show that the ash of SRC residue can be used to selectively catalyze desulfurization over hydrogenation in SRC processing. Selectivity for desulfurization in two stage hydrodesulfurization of coal is improved by using high reaction temperatures, short residence times, the ash of SRC residue as a first stage catalyst, and Co-Mo-Al as a second stage catalyst. Two stage catalytic SRC processing is more selective for hydrodesulfurization than catalytic or non-catalytic single stage SRC processing. 相似文献
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Inferior crude oil and fuel oil upgrading lead to escalating increase of hydrogen consumption in refineries. It is imperative to reduce the hydrogen consumption for energy-saving operations of refineries. An integration strategy of hydrogen network and an operational optimization model of hydrotreating (HDT) units are proposed based on the characteristics of reaction kinetics of HDT units. By solving the proposed model, the operating conditions of HDT units are optimized, and the parameters of hydrogen sinks are determined by coupling hydrodesulfurization (HDS), hydrodenitrification (HDN) and aromatic hydrogenation (HDA) kinetics. An example case of a refinery with annual processing capacity of eight million tons is adopted to demonstrate the feasibility of the proposed optimization strategies and the model. Results show that HDS, HDN and HDA reactions are the major source of hydrogen consumption in the refinery. The total hydrogen consumption can be reduced by 18.9% by applying conventional hydrogen network optimization model. When the hydrogen network is optimized after the operational optimization of HDT units is performed, the hydrogen consumption is reduced by 28.2%. When the benefit of the fuel gas recovery is further considered, the total annual cost of hydrogen network can be reduced by 3.21×107 CNY·a-1, decreased by 11.9%. Therefore, the operational optimization of the HDT units in refineries should be imposed to determine the parameters of hydrogen sinks base on the characteristics of reaction kinetics of the hydrogenation processes before the optimization of the hydrogen network is performed through the source-sink matching methods. 相似文献
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四川石化有限责任公司300×104 t/a渣油加氢脱硫装置采用CLG公司的固定床渣油加氢脱硫工艺技术,高压分离器顶出的循环氢排放量约13000 Nm3/h,尾气氢含量在80%以上。利用气体膜分离技术回收氢气,并将回收氢气作为装置的补充氢源,这不仅提高了氢源的利用率,降低制氢装置的生产负荷,缓解供氢矛盾,而且也降低了渣油加氢装置的成本。 相似文献