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用非贵金属催化剂制备歧化松香的研究 总被引:5,自引:0,他引:5
在自己组装的常压鼓泡气体循环反应装置上,考察了非贵金属催化剂及反应条件对松香歧化反应的影响,制备出活性好,无脱羧现象的“蛋壳型”非贵金属催化剂,在220℃反应温度下,制备出符合工业要求的特级歧化松香(枞酸〈0.5%,去氢枞酸〉50%)取得了松香歧化用非贵金属催化剂小试制备的较佳结果。 相似文献
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介绍了镇海炼化芳烃PX装置异构化单元所采用的SKI- 4 0 0型催化剂的技术指标、反应性能、首次装填、预处理、投料试车及六个月来的运行情况 ,并对该催化剂的应用进行特性分析 ,指出了SKI - 4 0 0型催化剂完全适用于缺少歧化的芳烃联合装置 ,具有高活性、高乙苯转化率的特点。 相似文献
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钯/竹炭催化剂催化湿地松松香歧化反应研究 总被引:2,自引:0,他引:2
研究钯/竹炭(Pb/BC)催化剂对湿地松松香的歧化反应,确定了最佳反应条件,催化剂用量为原料松香质量的 0.4%,搅拌速率 500 r/min,反应温度 270℃,反应时间 3 h,此时湿地松香歧化松香脱氢枞酸达到 56% 以上,枞酸降到 2% 左右,但枞酸指标仍未达到国家标准(枞酸含量≤0.5%)。在其他条件相同,催化剂用量为 0.3% 的反应条件下,采用Pd/BC催化剂也可以催化马尾松松香进行歧化反应,马尾松歧化松香中的枞酸含量为 0.43%, 可以达到国家标准。 相似文献
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A new kinetic model for commercial unit of toluene disproportionation and C9-armatiocs transalkylation is developed based on the reported reaction scheme.A time based catalyst deactivation function taking weight hourly space velocity(WHSV)into account is incorporated into the model,which reasonably accounts for the loss in activity because of coke deposition on the surface of catalyst during long-term operation.The kinetic parameters are benchmarked with several sets of balanced plant data and estimated by the differential variable metric optimiza- tion method.Sets of plant data at different operating conditions are applied to make sure validation of the model and the results show a good agreement between the model predictions and plant observations.The simulation analysis of key variables such as temperature and WHSV affecting process performance is discussed in detail,giving the guidance to select suitable operating conditions. 相似文献
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针对金陵石化I重整装置2016年2月出现的脱庚烷塔底物料中非芳含量上升、抽提原料中非芳含量上升、反应总温降下降以及单位产氢量下降等反应苛刻度低的问题进行详细分析,总结出可能引起反应苛刻度低的四个方面条件:I重整进出物料换热器内漏、原料性质、操作条件及催化剂性质,并分别对四个方面的条件进行详细的数据对比分析,最后得出本次I重整装置反应苛刻的低的主要原因为增加了S含量高达(4~6)×10-6的II加氢裂化装置重石掺炼量,致使重整催化剂出现轻微的S中毒,加快了催化剂积碳速率,且因I重整装置扩容改造后未增加催化剂再生能力,再生能力不足直接导致待生催化剂中C含量高达6.66%,从而使重整催化剂金属活性降低,直接降低了催化剂烷烃脱氢环化性能,使I重整反应苛刻度下降,脱庚烷塔底C8+物料及抽提进料中非芳含量明显升高。 相似文献
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松香歧化反应的新型催化剂研究 总被引:3,自引:1,他引:3
采用先进的纳米技术制备催化剂,开发出了用于松香歧化反应的非贵金属纳米催化剂,并对其用于松香歧化的工艺条件进行了考察。实验表明,溶胶-凝胶-沉淀法制备的N/L-T催化剂,在500 ℃焙烧2.5 h,经预处理(用氢气在300 ℃还原3 h),具有较高的催化活性。并得出歧化松香的最佳制备工艺为:反应温度270 ℃,反应时间3 h,催化剂用量为2.5%。 相似文献
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HAT-096M甲苯歧化与烷基转移催化剂的工业应用 总被引:1,自引:0,他引:1
HAT-096M型甲苯歧化与烷基转移催化剂在辽阳石化芳烃装置工业上连续应用已3年.工业应用结果表明,该催化剂性能良好,操作稳定,并且具有一定抗水性.在质量空速1.7 h-1时,平均质量转化率45.5 %, 平均选择性96.8%(mol).与HAT-096催化剂相比,催化剂改进后,空速进一步提高,氢烃比明显降低,C10芳烃处理能力增强. 相似文献
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八碳芳烃临氢异构化反应动力学模型 总被引:1,自引:1,他引:1
针对某实际工业异构化装置,在已开发的八碳芳烃临氢异构化反应网络的基础上,将系统中的八碳环烷烃和八碳链烷烃作为一个集总组分,提出新的六组分异构化反应网络,由此建立了适用于工业生产的八碳芳烃临氢异构化反应动力学模型.考虑结焦对催化剂活性的影响,提出了一种经验形式的催化剂失活函数,能够合理地描述催化剂失活过程.采用四五阶Runge-Kutta法对模型方程进行数值求解,基于多套稳态平衡数据采用差分变尺度优化算法(BFGS)对动力学参数进行估计,进而在不同操作条件下对模型进行验证.结果表明估计值与工业标定值相当吻合,达到了工业应用的模拟精度要求. 相似文献
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Eva Díaz Gerardo Adrio Salvador Ordóñez Aurelio Vega José Coca 《Catalysis Letters》2004,96(3-4):169-175
The competitive reactions of cyclohexene: disproportionation and dehydrogenation were studied over a supported-liquid phase catalyst (SLPC) of palladium acetate solved in a stationary phase employing two different techniques: pulsed and flow micro-reactor, where the products of reaction are analysed by gas chromatography. The effect of the liquid phase (comparing an aliphatic phase, squalane, with a polar phase, Triton), the reaction environment (comparing He, N2 and air) and the process conditions (temperature and reactant concentration) have been studied. Although continuous deactivation was observed in all the cases, the catalyst supported on the apolar phase presents better performance, whereas the disproportionation reaction only takes place at no oxidant conditions and the operation conditions only affect to the selectivity of the reaction. A kinetic model for the reaction, taking into account the catalyst deactivation has been proposed, and kinetic and deactivation constant were calculated by fitting the model to the experimental data. Arrhenius parameters were obtained from measured data at several temperatures. 相似文献
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A prolonged lifetime of a Ni-faujasite methanation catalyst and a stable rate of methanation can be achieved by operating the fluidized catalyst bed under unsteady state conditions. A higher rate of methanation is accompanied by a shift in selectivity compared to a steady state operation due to an enhanced disproportionation of CO. 相似文献
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In-situ regeneration of deactivated catalysts by dissolving coke or coke precursors with supercritical reaction fluids is of important economical significance. Investigations of coke extraction on zeolite-HY were performed in a gradientless reactor under supercritical and near-critical conditions with ethylbenzene disproportionation as a test reaction and n-butane or n-pentane as inert. Experimental results illustrate the large ability of coke extraction under supercritical conditions. The influences of the experimental conditions on the ethylbenzene disproportionation and the coke extraction are discussed. Under appropriate supercritical conditions the coking and the coke extraction can reach an equilibrium, so that no further deactivation of the catalyst was observed. Several regularities about coke extraction on the surface of the catalyst are proposed. 相似文献