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本文介绍了催化柴油加氢后返回催化装置回炼技术的应用。结果表明:催化柴油加氢后回炼使装置汽油收率增加了近5%,柴油收率下降,从而改变了全厂柴汽比,由投用前的1.5降到1.2。实现了多产汽油,少产柴油的目的。 相似文献
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以高芳烃含量的劣质催化裂化柴油为原料进行加氢转化工艺研究,考察体系压力、裂化温度、精制深度以及操作方式对催化柴油加氢转化工艺的影响。结果表明,随体系压力增加轻、重石脑油收率明显增加而转化柴油相应降低;随裂化温度增加汽油馏分明显增加且辛烷值有所提高,柴油馏分十六烷值呈先增加后降低的趋势;当控制精制油氮含量为35μg/g时,加氢转化工艺得到的产品质量最佳,汽油馏分研究法辛烷值达90以上,为优质的清洁高辛烷值汽油调和组分;从产品质量方面考虑部分循环操作方式最佳,可得到辛烷值超过90的汽油组分与十六烷值在45左右的清洁柴油馏分,加氢转化工艺是劣质催化裂化柴油高附加利用的优质路线。 相似文献
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介绍了原料加氢预处理对催化裂化(FCC)产品分布及性质的影响,比较了前后加氢工艺对炼厂产品分布的影响。结果表明,对高含硫的VGO、CGO等劣质FCC原料进行加氢处理能够显著改善其催化裂化性能,满足汽油产品标准质量升级的要求;同时原料预处理后FCC汽油和液化气产品产率大幅度增加,提高了企业的经济效益。 相似文献
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以加氢柴油为原料,选取催化裂化加工过程中常用的重油催化剂和多产丙烯催化剂,考察了加氢柴油在这两种类型催化剂上催化裂化时产物分布和产品性质的差异。实验结果表明,加氢柴油在重油催化剂有着更高的转化率和目的产物收率;但在多产丙烯催化剂上,产物选择性更优,并且氢转移反应得到减弱,液化气及汽油产品中烯烃含量升高;此外,相比于多产丙烯催化剂,重油催化剂上获得的汽油产品有着更高的芳烃含量,并且在未转化柴油组分中,饱和烃及单环芳烃含量显著降低,体现出重油催化剂对烃类较高的裂化性能。 相似文献
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LTAG技术的应用一方面催化柴油可以通过加氢后去催化裂化装置回炼,将催化柴油转化为汽油及液化气组分,减少了企业低十六烷值柴油组分,同时降低柴汽比;另一方面可大幅提高催化汽油辛烷值,同时降低烯烃含量,满足汽油质量升级的要求。本文以C企业采用催化柴油LTAG技术的应用实践为例,分析了该技术对企业结构调整的影响。 相似文献
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乌石化炼油厂加氢裂化装置主要产品是柴油、重石脑油,副产品是轻石脑油、液化气、干气、低分气,轻石脑油属于加氢裂化副产品。本文就降低轻石脑油收率在加氢裂化装置中的应用进行分析和探讨,为进一步提高产品收益最大化提供一定的生产依据。 相似文献
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基于低硫重质船用燃料油生产需要以及炼厂最大化生产重整原料和乙烯裂解原料转型升级背景,本文针对典型炼化一体化企业生产低硫船用燃料油,分别采用沸腾床和浆态床的不同重油加工方案从产品分布、产品性质及后续加工路线等进行经济性分析。结果表明,相比于浆态床加氢方案,尽管沸腾床渣油加氢转化率低于浆态床,但由于转化后的产品中干气收率低、各种馏分油的氮含量显著低于浆态床方案,且可以直接生产低硫船用燃料油、不存在废渣处理等优势,此外,耗氢较低,同时航煤、石脑油及芳烃产量增量明显,以50美元效益测算价测算,沸腾床方案扣消费税毛利较浆态床方案高16.13亿元。可见,对于有低硫船用燃料油生产需求的炼化企业,采用沸腾床重油加工路线在经济性方面更具竞争力。 相似文献
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分析催化裂化柴油(LCO)加工路线及转化技术,提出催化裂化轻、重柴油分别抽出,轻柴油加氢精制后作为产品柴油;催化重柴油(HLCO)经加氢开环后,再经催化裂化反应,将部分柴油转化为汽油和液化气.通过中试实验确定了蜡油加氢原料蜡油掺炼不同比例HLCO,对蜡油加氢反应特性及产品性质的影响.工业生产运行结果表明,蜡油加氢原料掺... 相似文献
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介绍中国石化催化剂有限公司齐鲁分公司COKC-1催化剂在中国石化武汉分公司二套催化裂化装置的工业应用情况。结果表明,与对比催化剂相比,在平衡剂重金属含量增加情况下,COKC-1催化剂表现出优良的抗重金属能力和水热稳定性;使用COKC-1催化剂后,汽油产率增加6.68个百分点,汽油产率达到51.28%,液化气和汽油总产率增加2.73个百分点,油浆、干气和柴油产率下降。 相似文献
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Since the production cost of biodiesel is now the main hurdle limiting their applicability in some areas, catalytic cracking reactions represent an alternative route to utilization of vegetable oils and animal fats. Hence, catalytic transformation of oils and fats was carried out in a laboratory-scale two-stage riser fluid catalytic cracking (TSRFCC) unit in this work. The results show that oils and fats can be used as FCC feed singly or co-feeding with vacuum gas oil (VGO), which can give high yield (by mass)of liquefied petroleum gas (LPG), C2-C4 oletms, tor example 45% LPG, 47% C2-C4 olefins, and 77.6% total liquid yield produced with palm oil cracking. Co-feeding with VGO gives a high yield of LPG (39.1%) and propylene (18.1%). And oxygen element content is very low (about 0.5%) in liquid products, hence, oxygen is removed in the form of H2O, CO and CO2. At the same time, high concentration of aromatics (C7-C9 aromatics predominantly) in the gasoline fraction is obtained after TSRFCC reaction of palm oil, as a result of large amount of hydrogen-transfer, cyclization and aromatization reactions, Additionally, most of properties of produced gasoline and diesel oil fuel meet the requirements of national standards, containing little sulfur. So TSRFCC technology is thought to be an alternative processing technology leading to production of clean fuels and light olefins. 相似文献
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Study of direct and indirect naphtha recycling to a resid FCC unit for maximum propylene production 总被引:2,自引:0,他引:2
To satisfy the increasing propylene demand, direct and indirect naphtha recycling schemes around an existing resid fluid catalytic cracking (FCC) unit were investigated. To this aim, light cracked naphtha (LCN), heavy cracked naphtha (HCN) and a PolyNaphtha (PN) oligomerisation product were cracked under a wide range of operating conditions over a commercial Y zeolite based equilibrium catalyst. Experimental data were acquired in three different units: a fixed bed bench scale unit, a fixed fluidised bed unit and an adiabatic circulating fluidised bed pilot plant. It was shown that FCC naphthas require high operating severities to crack, and that even then their conversion remains relatively moderate. Hence, direct recycling to the main riser does not seem a viable pathway to increase propylene product. Feeding FCC naphthas to a second reaction zone operating at high severity allows to increase the propylene yield in a significant manner. Increasing conversion, however, not only leads to higher LPG and propylene yields, but also results in very high dry gas yields. An alternative scheme was proposed, in which the olefinic C4 and C5 fractions are converted into a naphtha fraction through oligomerisation in a dedicated unit before being recracked in the secondary riser. As the highly olefinic oligomerised effluent mainly consist of dimerised and trimerised butenes and pentenes, this feed is more easily cracked and high conversions can be achieved. This indirect interconversion of butenes and pentenes into propylene therefore effectively allows to convert these butenes and pentenes into propylene, resulting in a significant increase in propylene yield. Each of the three main naphtha recycle options (directly to the main riser, directly to a secondary riser or indirectly via a light olefin oligomerisation unit) have been analysed and compared to a base case. In the evaluation of each of these schemes, all heat balance effects, both on the riser and the regenerator side, have been accounted for. The proposed process scheme with an indirect recycle via an oligomerisation unit enhances the already inherent flexibility of the FCC unit. The naphtha recycle can be turned on or off, the second reaction zone can be used to crack naphtha or to crack resid feed to maximise throughput, while the effluent of the oligomerisation unit can be recycled to the FCC unit for propylene production or hydrogenated and sent to gasoline and kerosene pool. 相似文献
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利用催化裂化催化剂在小型固定流化床实验装置上对催化裂化汽油催化改质降烯烃过程的反应规律进行了实验研究,详细考察了反应温度、剂油比和重时空速对产物收率和汽油辛烷值的影响,得到了催化裂化汽油改质过程的最佳实验操作条件:反应温度为400~430℃,剂油比为7左右,重时空速为20~30 h-1。在此基础上,计算了汽油改质过程的反应热,分析了反应条件对反应热的影响,揭示了反应热的变化规律。结果表明,低温改质为放热过程,高温改质为吸热过程。改质条件对反应热影响的强弱顺序为反应温度>剂油比>重时空速。 相似文献
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随着中国经济增长趋缓和国民生活水平提高,国内成品油市场消费增速在整体下降的同时,出现了汽油消费增长,柴油消费负增长的新格局。介绍了某燃料型炼油厂紧盯市场需求,通过优化装置操作,降低MTBE硫含量、拓宽重整及催化汽油加氢装置原料、提高催化装置负荷等措施,全厂柴汽比降低0.33,全年可增产汽油5.81万t,在满足市场需要的同时,取得了良好的经济效益。 相似文献