共查询到16条相似文献,搜索用时 234 毫秒
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高浓度己内酰胺在磁稳定床反应器中加氢精制研究 总被引:1,自引:0,他引:1
对高浓度(0.9)己内酰胺水溶液在磁稳定床反应器中加氢精制过程进行了研究,探讨了各种操作参数对反应结果的影响,考察了催化剂的稳定性。实验结果表明,采用该工艺可使质量分数为0.9的水溶液的高锰酸钾值从50s提高到300s以上,催化剂寿命1200h。与工业釜式己内酰胺加氢精制工艺相比,催化剂用量可降低50%。 相似文献
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对磁稳定床及磁性催化剂在石油化工和生物工程等领域的应用进行了归纳总结。磁稳定床已经应用于催化加氢、烟尘净化、干法选煤、生化分离、固定化生物反应器、细胞培养等过程。与传统工艺相比,磁稳定床兼有固定床和流化床的优点,能强化受传质传热限制的反应过程,提高反应效率,在实际应用中显示出独特的优越性。磁性催化剂的设计与开发是磁稳定床应用的关键,目前磁性催化剂以包覆型催化剂为主,其共同特点是具有适宜的磁性和低温反应活性,利于反应操作。磁稳定床及其磁性催化剂的研究开发是催化剂工业发展的一个新方向。 相似文献
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镍基非晶态合金加氢催化剂与磁稳定床反应器的开发与工业应用 总被引:6,自引:3,他引:6
报道了开发镍基非晶态合金加氢催化剂的实验室研究、中试研究及工业应用研究结果。向非晶态合金中加入少量原子半径大的其他元素,使非晶态合金的晶化温度由360℃提高到520℃;在含镍非晶态合金中加入铝,然后用碱将铝抽出,使非晶态合金比表面积由1m^2/g增加到100m^2/g以上;在建立30t/a非晶态合金生产示范装置中,自行设计了特殊的喷嘴和选用适宜的坩埚材质,使生产成品率由20%左右提高到95%以上,利用副产的偏铝酸钠,合成NaY分子筛,形成了整体的清洁生产过程;重点介绍了非晶态合金加氢催化剂经在三个工厂工业应用成功,三项工业应用成果每年为企业创造直接效益6700万元。还报道了对磁稳定床反应器的研究开发,经在20kt/a磁稳定床加氢示范装置上3500h试验,其生产效率比釜式加氢过程提高4倍,催化剂消耗减少50%。 相似文献
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介绍了己内酰胺加氢精制的工艺流程,总结了国内某15万t/a固定床己内酰胺加氢精制装置的运行数据,探究了反应压力、温度和催化剂等对加氢精制效果的影响。结果表明:当反应压力在由0.3 MPa升高至0.5 MPa时,加氢出口高锰酸钾吸收值(PAN值)逐渐降低,继续提高反应压力,PAN值变化不明显;当反应温度在50℃~60℃时,PAN值基本可稳定在0.8~1.6,碱度在0.13 mmol/kg左右波动,可保证己内酰胺水溶液质量达标;经过加氢反应,己内酰胺水溶液吸光度小幅降低、碱度小幅升高,但不会影响成品己内酰胺的质量;固定床加氢催化剂寿命较短,其活性下降的主要原因是催化剂结块和表层被己内酰胺覆盖。 相似文献
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A kinetic study into the styrene hydrogenation over a palladium on alumina catalyst has been made. Styrene was used as a model component for pyrolysis gasoline. A kinetic rate expression has been derived and the inhibiting effect of sulfur components has been included. Using this kinetics and mass-transfer models compiled from literature, the performance of two types of reactors for the styrene (pyrolysis gasoline) hydrogenation has been evaluated. A structured reactor such as a monolith has large advantages over a conventional trickle-bed reactor. For the monolithic reactor a more than 3 times higher volumetric productivity is obtained with much less catalyst. The modeling results indicate that deactivation by gum formation should be significantly less due to much better hydrogen mass transfer in the reactor. 相似文献
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非晶态合金催化剂用于葡萄糖加氢制山梨醇的研究 总被引:21,自引:4,他引:17
采用石油化工科学院研制的非晶态合金催化剂进行葡萄糖加氢,考察了温度、压力、pH 值、剂糖比和反应时间等因素对加氢反应的影响,并与其它Raney Ni 类催化剂进行了对比。结果表明,使用SRNA-3 非晶态合金催化剂进行葡萄糖加氢,当反应温度为130 ~140℃、压力为5 ~9MPa、pH值为8.35、剂糖质量比为1% 、反应时间为70~120min 时,转化率可达100% ,产品色度好。SRNA-3 催化剂的葡萄糖加氢活性好于Raney Ni 催化剂,重复使用时,也可保持较高活性。 相似文献
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Kontinuierliche Reaktionsführung der selektiven Hydrierung von Benzol zu Cyclohexen in einem Vier‐Phasensystem
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Currently, the production of nylon 6 and nylon 6.6 is based on the complete hydrogenation of benzene to cyclohexane over nickel or platinum catalysts and its subsequent oxidation at very low conversions to a mixture of cyclohexanol/cyclohexanone. This mixture is further reacted to ?‐caprolactam or adipic acid. Alternatively, the reaction can be carried out by selective hydrogenation of benzene to cyclohexene and the subsequent hydration with acidic catalysts to cyclohexanol. A laboratory method for the selective hydrogenation of benzene in a continuous stirred‐tank reactor (CSTR) using a gas/liquid/liquid/solid (g/l/l/s) system is presented. 相似文献
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The performance of a multistage agitated contactor (MAC) with cocurrent reactive gas liquid upflow was studied for the hydrogenation of nitrile butadiene rubber using a homogenous osmium complex catalyst. The hydrogenation performance was investigated under various catalyst concentrations, liquid flow rates, pressures, and polymer concentrations. The desirable hydrogenation conversion of over 95% was achieved under the industrially relevant operation conditions. A comprehensive reactor model consisting of stirred tanks in series with back flow (CTB) was applied to describe the liquid flow behaviour in the presence of the hydrogenation process. The established model satisfactorily predicted dynamic hydrogenation performance considering the gas liquid mass transfer effect and temperature profile in each stage. A modified CSTRs-in-series model accounting for mass transfer effect was proposed to predict the hydrogenation degree at steady state and a good agreement was demonstrated between the model prediction and the experimental data. 相似文献