共查询到20条相似文献,搜索用时 15 毫秒
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催化裂化装置再生系统改造的探讨 总被引:2,自引:0,他引:2
阐述了催化裂化装置再生系统存在的问题,对催化剂再生过程中影响烧焦能力的因素、影响催化剂活性的因素等进行了分析,提出了改变操作条件、更换大比重催化剂、加高加大再生器、器内两段再生和前置烧焦罐再生等解决方案。 相似文献
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催化裂化多产丙烯技术研究进展 总被引:5,自引:0,他引:5
丙烯是重要的基本有机化工原料,近年来由于受到其下游衍生物需求的驱动,全球丙烯的年需求量一直持续增长。我国重油资源丰富,价格相对低廉,重油催化裂化多产丙烯技术受到广泛关注。本文主要论述了催化裂化增产丙烯技术的工艺和催化剂研究进展情况。 相似文献
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石油二厂MTBE装置由2万t/a扩能改造至6万t/a后,新建了混合C4原料脱丁二烯装置,为了保护脱丁二烯的加氢催化剂,必须脱掉混合C4原料中的砷化物。围绕混合C4原料脱砷,选择合适的脱砷催化剂,为国内外同类原料脱砷提供一定的借鉴。 相似文献
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M. A. Abul‐Hamayel 《化学工程与技术》2002,25(1):65-70
A novel fluid catalytic cracking (FCC) process, that utilizes a downer reactor, has been developed to enhance the yield of light olefins under high‐severity reaction conditions. The effect of heavier feedstock on this high‐severity fluid catalytic cracking (HS‐FCC) process has been investigated using a small‐scale HS‐FCC pilot plant (0.1 b/d). Hydrotreated and virgin vacuum gas oils (VGO), hydrotreated and virgin atmospheric residues (AR) were used as test‐feeds in a previous study. The yield of desired products, such as gasoline and light olefins, produced from virgin VGO cracking was 79 wt.‐%, which is much higher than that obtained from a conventional FCC process. In the case of hydrotreated VGO, the yield of desired products decreased to 76%, however. On the other hand, AR feeds exhibited a performance similar to VGO with a slight increase in coke formation. In this study microactivity test (MAT) results are reported in which the activity and selectivity of the Y‐zeolite based catalyst is evaluated. Kinetic modeling was also done based on a four‐lump reaction model. 相似文献
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指出催化裂化时在最佳时料浓度下加入芳烃添加物能提高汽油的产量和质量,能提高催化剂的选择性和活性,同时降低生焦量,提高轻质瓦斯油的产量,添加物的最佳浓度取决于催化裂化原料的性质及复杂结构单元的最小平均直径。 相似文献
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催化裂化碳四馏分加工方案对比 总被引:2,自引:0,他引:2
介绍了催化裂化碳四馏分的主要加工手段,以加工20万t/a催化裂化液态烃为基础,提出了4种加工流程,进行技术经济对比分析,确定了最佳的催化裂化碳四馏分加工方案。 相似文献
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ITQ-2 zeolites were prepared by sequential alkali-swelling and ultrasonic-delamination of precursor MCM-22 and characterized by X-ray powder diffraction, scanning electron microscopy, nitrogen adsorpti... 相似文献
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流化催化裂化汽油改质和增产低碳烯烃的研究 总被引:4,自引:0,他引:4
采用GL型催化剂,在小型固定流化床实验装置上考察了反应温度、剂油比、空速和水油比等操作条件对流化催化裂化(FCC)汽油催化改质汽油的产品分布、低碳烯烃(丁烯、丙烯和乙烯)产率和族组成的影响。实验结果表明,在一定反应条件下,FCC汽油通过催化改质可以降低烯烃含量,提高芳烃含量和辛烷值,在满足新汽油标准的同时提高了低碳烯烃的产率。此外,较高的反应温度、剂油比和水油比以及较低的空速有利于FCC汽油催化改质和增产低碳烯烃。 相似文献
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指出了中国石油哈尔滨石化公司0.8Mt/aRFCCU焚烧式CO余热锅炉存在的问题,通过增设低温过热器,改变省煤器结构,利用水热媒技术和选用固定旋转蒸汽吹灰器及脉冲吹灰器等改进措施,提高了CO余热锅炉的蒸汽过热能力,烟气能量回收能力和锅炉热效甲,节能效果明显,取得了很好的经济效益。 相似文献
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The exploration of structure–activity relationships (SARs) in chemical lead optimization is mostly focused on activity against single targets. Because many active compounds have the potential to act against multiple targets, achieving a sufficient degree of target selectivity often becomes a major issue during optimization. Herein we report a data analysis approach to explore compound selectivity in a systematic and quantitative manner. Sets of compounds that are active against multiple targets provide a basis for exploring structure–selectivity relationships (SSRs). Compound similarity and selectivity data are analyzed with the aid of network‐like similarity graphs (NSGs), which organize molecular networks on the basis of similarity relationships and SAR index (SARI) values. For this purpose, the SARI framework has been adapted to quantify SSRs. Using sets of compounds with differential activity against four cathepsin thiol proteases, we show that SSRs can be quantitatively described and categorized. Furthermore, local SSR environments are identified, the analysis of which provides insight into compound selectivity determinants at the molecular level. These environments often contain “selectivity cliffs” formed by pairs or groups of similar compounds with significantly different selectivity. Moreover, key compounds are identified that determine characteristic features of single‐target SARs and dual‐target SSRs. The comparison of compounds involved in the formation of selectivity cliffs often reveals chemical modifications that render compounds target selective. 相似文献
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采用离线调优的方法,对石油一厂催化裂化反再系统的操作条件进行了优化计算,建立了较精确的生产过程数学模型。在对生产过程进行模拟与优化的基础上,针对催化裂化装置在原料性质及加工量变化状况,就如何选择各种工艺参数等问题进行了优化处理;为确定生产装置调优指标和改造措施提供了方便可行的方案,同时也为提高催化裂化装置的经济效益提供了可靠信息。 相似文献
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介绍了催化裂化油浆的性质和组成特点,油浆中脱除催化剂颗粒的常用分离技术与现状,着重对油浆的加工组合工艺和综合利用进行了综述。最后对催化裂化油浆的综合利用进行展望。 相似文献
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以均四甲苯气相催化氧化制备均苯四甲酸二酐为研究对象,通过测定催化剂表面酸性,研究了以V2O5为基础,加入其它金属氧化物的多元组分催化剂的表面酸性与氧化选择性和活性的关系;同时研究了催化剂的组成、V2O5还原度和焙烧温度对其酸性的影响。结果表明,催化剂的表面酸性与氧化选择性和活性有关,V2O5-TiO2-Na2O-P2O5是酸性催化剂;对于催化剂V2O5-TiO2-Na2O-P2O5来说,当V^5 /Vtotal的值接近54.3%时,催化剂的表面酸性最高,当此催化剂在温度为550℃下焙烧,所得催化剂的酸度有一最大值。 相似文献
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催化裂化轻汽油在ZSM-5分子筛催化剂上裂化反应的研究 总被引:2,自引:0,他引:2
以ZSM-5分子筛为催化剂,在小型固定床反应器上,进行了催化裂化轻汽油的裂化反应。考察了反应温度和空速对催化裂化轻汽油裂化反应气液相收率和产品分布的影响。实验结果表明,ZSM-5分子筛催化剂具有较强的裂化活性和氢转移活性。在保证裂化转化率的条件下,提高反应温度和空速可以抑制催化剂上氢转移反应的发生。以ZSM-5分子筛为催化剂上的催化裂化反应中,温度、空速是影响转化率和选择性的重要因素,因此可以通过改变温度、空速来提高目的产物的选择性。但是,单纯依靠改善反应条件,不能使目的产物的收率和选择性达到理想的程度,还必须对催化剂进行改性。ZSM-5分子筛催化剂上催化裂化反应的研究为ZSM-5分子筛催化剂的进一步改性,及ZSM-5分子筛催化剂在轻汽油催化裂解和汽油改质方面的进一步应用提供了试验依据。 相似文献