共查询到18条相似文献,搜索用时 125 毫秒
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催化裂化辛烷值助剂技术的近期进展 总被引:1,自引:0,他引:1
杨林森 《精细石油化工进展》2000,1(6):36-38,32
探讨石油馏分的催化裂化反应及影响催化裂化汽油辛烷值的主要因素,评述了催化裂化辛烷值助剂技术的近期进展。指出ZSM-5沸石用作催化裂化辛烷剂时,主要是通过择形裂化或异沟化改变催化裂化汽油的组成,从而达到提高汽油辛烷值的目的。 相似文献
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FCC汽油重馏分的催化裂化和热裂化产物组成的研究 总被引:5,自引:1,他引:4
以FCC汽油重馏分为原料,分别在惰性石英砂及酸性催化剂上,反应温度为300 -700℃,在小型固定流化床上进行热裂化和催化裂化实验。结果表明,FCC汽油重馏分的热裂化起始反应温度为525℃左右。在催化裂化实验中,当反应温度为300-500℃时,FCC汽油重馏分催化裂化所得的干气100%由单分子裂化反应所产生;525℃时93%的干气由单分子裂化反应产生;550℃时63%的干气由单分子裂化反应产生;反应温度高于600℃时,干气几乎100%由热裂化反应所产生。单分子裂化反应所产生的干气组成中,按体积分数大小的顺序依次为C2H4、CH4、H2和C2H6。而热裂化反应所产生的干气组成中,CH4体积分数最高,约占50%,其次为H2,然后依次为C2H4、C2H6。当反应温度为300~600℃时,FCC汽油重馏分催化裂化所得的液化气80%~100%由催化裂化反应所产生,其主要组成为C3H4、iC4H10和C3H8,而热裂化液化气的主要组分为C3H6、iC4H8和C3H8。 相似文献
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催化裂化汽油的下行床催化转化 总被引:4,自引:0,他引:4
以循环下行床为反应器,催化裂化汽油为原料,在工业催化裂化(FCC)催化剂和催化裂解(DCC)催化剂作用下,研究了催化裂化汽油的催化转化过程。实验结果表明,在下行床反应器中,催化裂化汽油中的烯烃能显著降低,主要转化为低碳烯烃产品,同时得到富含芳烃的液体产品,副产干气和焦炭量很低。催化裂化汽油在FCC催化剂和DCC催化剂上表现出不同的反应机理。FCC催化剂孔道大,可以发生双分子裂化反应和单分子裂化反应,而DCC催化剂孔道小,以单分子裂化反应机理为主,同时DCC催化剂低碳烯烃选择性更高。 相似文献
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综述了国内外催化裂化汽油降烯烃及加氢脱硫技术进展。通过优化操作条件及采用新工艺,对裂化反应、氢转移反应和异构化反应等进行控制与选择,可以明显降低汽油烯烃含量;加氢脱硫技术能够有效降低汽油硫含量,减少辛烷值损失。针对国内汽油质量现状,提出了优化技术方案,降低生产成本的建议。 相似文献
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催化裂化增产汽油的分析与探讨 总被引:2,自引:0,他引:2
增产汽油应从占汽油池70%以上的催化裂化工艺技术着手,通过优化加工流程提供具有较好裂化性能的催化裂化原料,选择对大分子裂化能力强的催化剂,维持较高的平衡剂活性,优化反应-再生系统的工艺操作参数,强化催化裂化反应,提高单程转化率;采用催化裂化柴油馏分回炼技术,尤其是富含链状烃和单环芳烃的柴油轻馏分有助于增产高辛烷值汽油;严格控制分馏和吸收稳定系统的操作条件,用足汽油干点和蒸气压质量指标等措施,可有效增加催化裂化汽油产率。 相似文献
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以硫酸锌为锌源,制备了锌改性催化裂化(FCC)催化剂,对锌改性催化剂抗铁污染机理进行了分析,并对其理化性能和反应性能进行了评价。结果表明:高温焙烧条件下,锌与铁能够形成高熔点锌铁尖晶石稳定物种(ZnFe_2O_4);锌改性FCC催化剂与常规FCC催化剂的比表面积、孔体积、微反活性无明显差异,但二者经过铁污染后,锌改性FCC催化剂的比表面积、孔体积和微反活性均明显高于常规FCC催化剂的;相同铁污染条件下,与常规FCC催化剂相比,锌改性FCC催化剂的重油收率降低了0.89个百分点,汽油和总液体收率分别提高了0.61,0.75个百分点。 相似文献
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ZRP沸石对FCC汽油催化裂解产丙烯的影响 总被引:3,自引:0,他引:3
本文研究了550℃,常压,加有水蒸气条件下,FCC汽油在ZRP沸石上的催化裂解反应,研究了ZRP硅铝比变化和稀土改性ZRP对反应的影响。通过实验结果分析和反应前后反应物与产物分布的计算研究表明,丙烯生产是通过FCC汽油中烯烃进行裂化反应实现的。提高烯烃的选择转化率、促进裂化反应和提高丙烯产品的选择性将有利于丙烯产量的增加。提高ZRP沸石硅铝比能够增加沸石的强酸量,提高烯烃的转化率,提高低碳烯烃的选择性,但丁烯选择性高于丙烯的选择性。稀土改性的ZRP沸石能够增加强酸量,提高烯烃的转化率,提高丙烯的产品选择性。 相似文献
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利用小型固定流化床(FFB)装置,采用MMC-2催化剂,考察汽油族组成对汽油催化裂化反应过程中干气生成的影响。结果表明,汽油催化裂化反应过程中干气主要由催化裂化反应产生,热裂化反应产生的干气所占的比例很低。随着汽油原料中烯烃含量的增加,氢气、甲烷和乙烷的产率基本保持不变,乙烯的产率明显增加。烷烃引发反应时形成的五配位正碳离子的裂解反应生成氢气、甲烷、乙烷和乙烯等干气组分。烯烃质子化形成的三配位伯正碳离子可能直接发生β裂解生成乙烯。伯正碳离子直接发生β裂解的反应和先发生异构化生成仲正碳离子再发生β裂解反应的比值是固定的。 相似文献
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Fluid Catalytic Cracking (FCC) is one of the processes applied world-wide for upgrading of heavy petroleum cuts by converting them into lighter products in the gasoline, light, and heavy cycle oil ranges. Catalytic cracking process was developed in the early stages of petroleum refining. It started by utilizing chemically treated natural clays as catalysts. In the early 1960s the introduction of zeolite containing catalysts, mainly the wide pore faujasite family (X-and Y-type) has significantly contributed to the yield as well as FCC process design consideration. The overall process performance is strongly dependent the catalyst characteristics. Therefore, FCC catalyst manufacturers and researchers are continuously searching for modified catalyst characteristics (improved thermal and hydrothermal stability, higher Activity and better selectivity for high barrel-octane gasoline production). This research activity resulted in this introduction of several FCC catalyses with enhanced performance to suit the steadily increasing emand for high quality refined FCC products.
The present review is aimed at throwing a light on the FCC process with special emphasis on the recent advances made in the field of catalysts design and its impact on the whole FCC process performance as related to the production of high octane gasoline. 相似文献
The present review is aimed at throwing a light on the FCC process with special emphasis on the recent advances made in the field of catalysts design and its impact on the whole FCC process performance as related to the production of high octane gasoline. 相似文献
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Abstract Fluid Catalytic Cracking (FCC) is one of the processes applied world-wide for upgrading of heavy petroleum cuts by converting them into lighter products in the gasoline, light, and heavy cycle oil ranges. Catalytic cracking process was developed in the early stages of petroleum refining. It started by utilizing chemically treated natural clays as catalysts. In the early 1960s the introduction of zeolite containing catalysts, mainly the wide pore faujasite family (X-and Y-type) has significantly contributed to the yield as well as FCC process design consideration. The overall process performance is strongly dependent the catalyst characteristics. Therefore, FCC catalyst manufacturers and researchers are continuously searching for modified catalyst characteristics (improved thermal and hydrothermal stability, higher Activity and better selectivity for high barrel-octane gasoline production). This research activity resulted in this introduction of several FCC catalyses with enhanced performance to suit the steadily increasing emand for high quality refined FCC products. The present review is aimed at throwing a light on the FCC process with special emphasis on the recent advances made in the field of catalysts design and its impact on the whole FCC process performance as related to the production of high octane gasoline. 相似文献