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1.
介绍了焦化蜡油的特征组分和各组分对催化裂化反应的影响。概括了焦化蜡油影响催化裂化转化率的3个因素:焦化蜡油本身低裂化性能,竞争吸附效应,易生焦特性。对催化裂化掺炼焦化蜡油的催化裂化吸附转化加工焦化蜡油工艺,两段提升管加工焦化蜡油工艺和分区催化裂化工艺进行了概述。指出开发具有脱氮功能的催化裂化焦化蜡油催化剂、氮转移助剂及脱氮工艺,减少催化裂化过程中氮转移至液体产品,满足产品质量的需求,是催化裂化焦化蜡油发展的趋势之一。  相似文献   

2.
延迟焦化馏出油加氢精制的研究   总被引:5,自引:0,他引:5  
根据延迟焦化馏出油的特性,开发出焦化蜡油加氢处理与催化裂化或加氢裂化构成的组合工艺,以拓宽催化裂化或加氢裂化的原料来源。研究了焦化液体产物作为加氢精制原料的优化方案,焦化全馏分油加氢及焦化柴油与蜡油混合油加氢较纯焦化蜡油加氢效益更好。  相似文献   

3.
在实验室条件下,分别以D72阳离子活化树脂和D001-CC阳离子活化树脂为吸附剂,在连续吸附固定床反应器中对焦化蜡油进行吸附脱氮研究,并用催化裂化微反装置对脱氮后的焦化蜡油进行催化裂化反应性能研究。考察两种活化树脂在固定床吸附反应器中的吸附穿透曲线、两种活化树脂对焦化蜡油中碱性氮的动态吸附特性及两种活化树脂在不同吸附温度下对焦化蜡油碱性氮脱除率的影响,比较两种活化树脂的吸附性能。脱氮前后焦化蜡油分别进行催化裂化反应,比较脱氮前后焦化蜡油催化裂化反应性能。实验结果表明:D001-CC活化树脂的最佳吸附温度为70℃,6h后吸附能力达到饱和,饱和吸附量为19.35mg/g;D72活化树脂的最佳吸附温度为60℃,5h后吸附能力达到饱和,饱和吸附量为7.75mg/g。焦化蜡油经树脂脱氮处理后催化裂化反应程度加深,转化率提高。反应温度为400℃时,未脱氮的焦化蜡油转化率为44%,经过30min吸附脱氮处理,焦化蜡油的转化率达到81.5%。在较高的反应温度下,碱性氮的含量对催化剂活性的影响更为敏感,碱性氮的含量减少幅度较大的焦化蜡油,催化裂化的转化率增加更多。  相似文献   

4.
辽河劣质焦化蜡油溶剂精制-催化裂化组合工艺研究   总被引:4,自引:0,他引:4  
为合理利用辽河超稠原油经延迟焦化加工得到的劣质焦化蜡油,进行了采用溶剂精制-催化裂化组合工艺加工该焦化蜡油的中型试验研究。试验结果表明,辽河劣质焦化蜡油经溶剂精制可以在抽余油(精制油)收率为70%的条件下脱出85%的氮、16%的硫,以及39%的多环芳烃、胶质和沥青质,可为催化裂化装置提供优质的原料。精制油催化裂化反应转化率比劣质焦化蜡油提高88%,精制油的催化裂化反应性能优于辽河重油催化裂化原料,辽河重油催化裂化原料中掺入精制油后与其单独催化裂化相比,轻质油收率提高,生焦率下降,产品质量明显改善。  相似文献   

5.
用糠醛抽出液作溶剂精制焦化蜡油焦化蜡油与直馏蜡油相比其硫、氮、焦粉含量高,芳烃和胶质含量高,因而不宜直接进催化裂化装置。焦化蜡油溶剂精制是改善催化裂化原料质量的有效手段。研究者们对焦化蜡油糠醛抽提进行了大量研究,抽余油是优质催化裂化原料,抽出油可再进...  相似文献   

6.
合理利用焦化蜡油为催化裂化提供原料   总被引:1,自引:1,他引:0  
介绍了国内外在利用焦化蜡油作催化裂化原料方面的技术现状。焦化蜡油的特点及直接用作催化裂化原料的影响,焦化蜡油加氢处理后用作催化裂化原料对催化裂化过程的改善,对我国如何合理利用焦化蜡油解决催化裂化原料不足问题提出了建议。  相似文献   

7.
 采用糠醛对辽河超稠原油直接延迟焦化得到的劣质焦化蜡油及其与催化回炼油的混合油进行溶剂精制,并在连续反应-再生催化裂化中型实验装置中进行了溶剂精制前后劣质焦化蜡油及其与催化回炼油混合油的催化裂化反应。结果表明,在精制油收率67%~70%的条件下,溶剂精制法可脱除劣质焦化蜡油中78%~85%的氮和36%~39%的芳烃、胶质及沥青质。劣质焦化蜡油及其与催化回炼油的混合油溶剂精制后,其催化裂化反应转化率大幅度提高。精制油的催化裂化反应性能优于辽河渣油催化裂化(RFCC)原料,与RFCC原料掺炼后,轻质油产率提高,生焦率下降,产品质量明显改善。  相似文献   

8.
高硫原油的加工路线比较   总被引:1,自引:0,他引:1  
对某种高硫原油的不同加工路线进行比较,分别测算在不同原油价格和产品价格时期各方案的经济效益。结果表明,在较低油价时,加氢裂化(全循环)-延迟焦化方案的经济效益好于常压渣油加氢-催化裂化方案,常压渣油加氢-催化裂化方案的经济效益好于蜡油加氢精制-催化裂化-延迟焦化方案;而在较高油价时,常压渣油加氢-催化裂化方案的经济效益明显好于加氢裂化(全循环)-延迟焦化方案和蜡油加氢精制-催化裂化-延迟焦化方案;对于高硫减压蜡油,加氢裂化(全循环)-延迟焦化方案的经济效益好于蜡油加氢精制-催化裂化-延迟焦化方案。  相似文献   

9.
焦化蜡油脱氮精制-催化裂化组合工艺研究   总被引:6,自引:0,他引:6  
介绍了焦化蜡油脱氮精制-催化裂化组合工艺的实验室研究情况.该工艺采用研制的脱氮用精制剂,该精制剂为一种酸性络合剂,能选择性脱除焦化蜡油中的碱性氮化物,精制后油的收率97%以上.研究结果表明,在一定条件下,焦化蜡油脱氮精制前后的催化裂化产品收率表现出明显差异,精制后焦化蜡油催化裂化液化石油气、汽油和柴油三项收率之和比未精制油高10个百分点以上;焦化蜡油(25%)与直馏蜡油(75%)的混合油催化裂化时,焦化蜡油精制后的混合油催化裂化液化石油气、汽油和柴油三项收率之和比未精制油高近4个百分点.  相似文献   

10.
针对焦化蜡油碱性氮化物、芳烃含量高的特点,直接作为催化裂化原料时,应采用较高的反应温度,剂油比和抗氮能力强的催化剂,或者采用加氢精制,及与其他直馏蜡油混合加氢裂化;或者采用脱氮剂脱除焦化蜡油中的碱性氮化物,然后再做催化裂化原料。利用焦化蜡油正构烷烃和线性a烯烃也是焦化装置产品利用的新途径。  相似文献   

11.
Abstract

Upgrading heavy oil using syngas (CO + H2) as an alternative hydrogen source with a dispersed catalyst was investigated. Finely dispersed catalysts for upgrading were prepared by means of microemulsion, and their performance was investigated in a batch-type autoclave. This process was compared to the traditional pure hydrogen hydro-upgrading process. Feedstock conversion, light-oil yield, coke yield, product distribution, sulfur, nitrogen and viscosity were investigated comprehensively to optimize the process. The addition of finely dispersed catalysts could improve the distribution and performance of cracking products, and inhibit the cracking gas and coke formation. This work shows that residue-syngas coprocessing is promising for heavy oil upgrading.  相似文献   

12.
Abstract

Fluid catalytic cracking (FCC) is a process used to converted heavy petroleum products to light products such as gasoline, light fuel oil, and petroleum gas. In the fluid catalytic cracking reactor heavy gas oil is cracked into more valuable lighter hydrocarbon products. The reactor input is a mixture of hydrocarbons that makes the reaction kinetics very complicated due to the involved reactions. In this article, a four-lump model is proposed to describe the kinetics of vacuum gas–oil (VGO) cracking in the FCC process. This model is different from other models mainly in that the deposition rate of coke on catalyst can be predicted from gas–oil conversion and isolated from the C1-C4 gas yield. By this lumped model for the kinetic of cracking VGO we can also conclude that the C1-C4 gas yield increases with increasing reactor temperature, whereas the production of gasoline and coke decreases. We can also conclude that with decreasing space velocity the product yield will increase.  相似文献   

13.
焦化蜡油是延迟焦化工艺过程中产生的一种产品,由于其碱性氮化物、稠环芳烃、胶质含量高,使其加工利用受到限制,需要进行预处理。介绍了焦化蜡油的性质,综述了焦化蜡油预处理及综合利用的技术措施,包括加氢精制、溶剂精制、络合脱氮、氧化处理等预处理方法,经过预处理可作为催化裂化或加氢裂化原料,经溶剂抽提可回收芳烃等,对焦化蜡油的综合利用前景进行了展望。  相似文献   

14.
在焦化蜡油中加入WLDN-5脱氮剂,采用络合脱氮—白土精制工艺,可制备碱性氮化物含量较低的焦化蜡油。在某公司1.80 Mt/a重油催化裂化装置进行掺炼脱氮前后焦化蜡油对催化裂化反应性能的影响工业应用试验,结果表明,掺炼脱氮焦化蜡油后,降低原料油中氮含量使催化剂保持较高活性和减少催化剂生焦,在较低的反应温度下,改善产品分布,轻油收率增加0.86个百分点,总液体收率增加2.03个百分点,液化气和汽油收率分别增加1.17,0.94个百分点,干气、油浆和焦炭收率相应减少0.37,1.25,0.41个百分点,催化剂单耗降低0.05 kg/t。  相似文献   

15.
用乳化重油和纯重油为原料进行催化裂化反应,在相同操作条件下,分别研究了它们对裂化产品分布、生焦量、产品质量、裂化催化剂性能等主要指标的影响。结果表明,乳化油比纯重油液体产率提高2.91%、液化气增加1.33%、生焦量下降2.32%、干气量稍低;乳化油汽油辛烷值为93.4,而纯重油汽油辛烷值93.0;两者对裂化催化剂性能的影响相当。  相似文献   

16.
The microstructure and properties of the coke samples collected from 4 different wall regions of the cyclone in the reactor of a residue fluid catalytic cracking unit(RFCCU) were analyzed by using the scanning-electron microscope(SEM), and the possible coke formation processes were investigated as well. The results showed that some of the heavy nonvolatile oil droplets entrained in the flowing oil and gas mixture could possibly deposit or collide on the walls by gravity settling or turbulence diffusion, and then were gradually carbonized into solid coke by condensing and polymerization along with dehydrogenation. Meanwhile some of fine catalyst particles also built up and integrated into the solid coke. The coke can be classified into two types, namely, the hard coke and the soft coke, according to its property, composition and microstructure. The soft coke is formed in the oil and gas mixture's stagnant region where the oil droplets and catalyst particles are freely settled on the wall. The soft coke appears to be loose and contains lots of large catalyst particles. However, the hard coke is formed in the oil and gas mixture's flowing region where the oil droplets and catalyst particles diffuse towards the wall. This kind of coke is nonporous and very hard, which contains a few fine catalyst particles. Therefore, it is clear that the oil and gas mixture not only carries the oil droplets and catalyst particles, but also has the effects on their deposition on the wall, which can influence the composition and characteristics of deposited coke.  相似文献   

17.
 基于催化裂化反应化学,探讨降低干气和焦炭产率的催化裂化新技术(MIP-DCR)开发的原理;采用小型实验装置对该技术的可能操作模式进行探索;在中国石化九江分公司对该技术进行了工业应用,并采用CFD软件探讨了MIP-DCR工业试验装置的预提升混合器冷、热催化剂的可能混合方式。小型实验结果表明,在高活性、低剂油比的操作模式下干气和焦炭产率较低;工业应用结果表明:采用MIP-DCR技术通过减少热裂化和质子化裂化反应可以分别降低干气和焦炭15.48%和4.10%,增加液化气和汽油产率,同时降低能耗;MIP-DCR工艺打破热平衡限制,使剂油比成为独立变量,具有更多、更灵活的操作模式。  相似文献   

18.
将中东减压蜡油的加氢裂化尾油分为4个沸程范围不同的窄馏分,在固定流化床装置上考察了其催化裂化反应性能,采用GC/MS等方法对原料和裂化产物的烃类组成进行了分析。结果表明,4个窄馏分中饱和烃质量分数均高于98.0%,随着馏分变重,窄馏分中的链烷烃含量增大,环烷烃含量减小,并且链烷烃和各族环烷烃均向高碳数方向移动。4个窄馏分均易于裂化,干气和焦炭产率低,液化气和汽油收率高。在相同的催化裂化条件下,随着馏分变重,其可裂化性能增强,干气和焦炭产率降低,液化气收率增加,汽油收率增加但辛烷值略有降低,柴油和重油收率均降低。  相似文献   

19.
以减压蜡油掺炼焦化蜡油为原料,在小型固定流化床实验装置上考察了焦化蜡油掺炼比对催化裂化(FCC)反应性能的影响。结果表明:焦化蜡油掺炼比每增加1个百分点,FCC反应转化率约降低0.7个百分点,重油收率约增加0.7个百分点;随着焦化蜡油掺炼比的增加,液化气和汽油收率下降,干气收率上升,柴油和焦炭收率均先增大后减小,且在焦化蜡油掺炼比为20%时,柴油和焦炭收率均达到峰值。  相似文献   

20.
A well core-shell composite of Y@meso-Al with a mesoporous alumina shell and a Y zeolite core was synthesized. The mesoporous alumina shell has a wormhole-like structure with large mesopores. The prepared catalytic cracking catalyst using this composite has exhibited excellent catalytic performance for heavy oil cracking thanks to its favorable physicochemical properties, such as high surface area, large pore volume and outstanding acid sites accessibility for large molecules provided by the composite. In comparison with the reference catalyst using pure Y zeolite, the oil conversion achieved by the above-mentioned catalyst increased by 2.73 percentage points, while the heavy oil yield and coke yield decreased by 2.23 percentage points and 1.28 percentage points, respectively, with the light oil yield increasing by 2.27 percentage points.  相似文献   

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