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对甲苯甲醛中对甲苯甲酸的气相色谱分析 被引量:3
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作者 尤进茂 李怀娜 《化学世界》 CAS CSCD 1994年第8期426-428,共3页
本文探讨了对甲苯甲醛中对甲苯甲酸含量的气相色谱分析,以OV-101为固定相,用无纯样色谱校正因子测定法测定样品中各组分的校正因子,并采用内标法进行定量分析。方法简便、快速,相对标准偏差小于4%。为测定对甲苯甲醛中对甲... 本文探讨了对甲苯甲醛中对甲苯甲酸含量的气相色谱分析,以OV-101为固定相,用无纯样色谱校正因子测定法测定样品中各组分的校正因子,并采用内标法进行定量分析。方法简便、快速,相对标准偏差小于4%。为测定对甲苯甲醛中对甲苯甲酸的含量提供了一个准确可靠的气相色谱分析法。 展开更多
关键词 对甲苯甲醛 对甲苯甲酸 气相色谱
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对二甲苯电合成法制备对甲苯甲醛的气相色谱分析
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作者 牛淑妍 潘莹 +1 位作者 刘艳 王光信 《化学研究与应用》 CAS CSCD 2000年第1期91-93,共3页
研究了对甲苯甲醛的气相色谱分析条件。分别选用 8%OV - 2 1 0 ,1 0 %QF - 1和 8%DC - 2 0 0为固定相测定对甲基苯甲醛的含量。结果表明 :本方法快速、准确 ,标准偏差小于 0 2 %,回收率为 1 0 0 5 %~1 0 1 0 %。
关键词 气相色谱 对甲苯甲醛 电合成 对二甲苯
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芳醛电合成的研究──Ⅰ 对甲苯甲醛电合成方法的改进 被引量:1
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作者 王光信 刘道军 +2 位作者 董强 张书圣 马磊 《青岛化工学院学报(自然科学版)》 1995年第4期303-307,共5页
确定了用Pb(+)-Pb(-)电极对使Mn(Ⅱ)电氧化成Mn(Ⅲ)的优选条件,并测定了在四丁基溴化铵催化下选用Mn(Ⅲ)氧化对二甲苯制对甲苯甲醛反应的动力学参数。
关键词 对甲苯甲醛 电合成 芳醛
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Fuzzy Support Vector Regression Model of 4-CBA Concentration for Industrial PTA Oxidation Process 被引量:3
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作者 张英 苏宏业 +1 位作者 刘瑞兰 褚健 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2005年第5期642-648,共7页
In the past few years, support vector machines (SVMs) have been applied to many fields, such as pattern recognition and data mining, etc. However there still exist some problems to be solved. One of them is that the S... In the past few years, support vector machines (SVMs) have been applied to many fields, such as pattern recognition and data mining, etc. However there still exist some problems to be solved. One of them is that the SVM is very sensitive to outliers or noises because of over-fitting problem. In this paper, a fuzzy support vector regression (FSVR) method is presented to deal with this problem. Strategies based on k nearest neighbor (kNN) and support vector data description (SVDD) are adopted to set the fuzzy membership values of data points in FSVR.The proposed FSVR soft sensor models based on kNN and SVDD are employed to predict the concentration of 4-carboxy-benzaldehyde (4-CBA) in purified terephthalic acid (PTA) oxidation process. Simulation results indicate that the proposed method indeed reduces the effect of outliers and yields higher accuracy. 展开更多
关键词 purified terephthalic acid 4-carboxy-benzaldehyde support vector machines soft sensor fuzzy membership
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Effect of CO2 on oxidation of p-xylene in acetic acids/CO2
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作者 HUANG Kan CHEN Jie ZHAO Ling 《Journal of Chemistry and Chemical Engineering》 2009年第4期44-47,共4页
The oxidation of p-xylene to terephthalic acid with molecular oxygen in acetic acids modified carbon dioxide over Co/Mn/Br catalyst was studied in a batch reactor. The results showed that the oxidation of p-xylene to ... The oxidation of p-xylene to terephthalic acid with molecular oxygen in acetic acids modified carbon dioxide over Co/Mn/Br catalyst was studied in a batch reactor. The results showed that the oxidation of p-xylene to terephthalic acid was severely inhibited when carbon dioxide exceeded a certain amount, the conversion of p-xylene decreased rapidly from 100.0% to 3.3% and the yield of terephthalic acid dropped from 42.6% to trace. Whereas the oxidation processes of p-Tolualdchyde to p-Toluic acid and 4-Carboxybenzaldehyde to tcrcphthalic acid were improved when a relative small amount of CO2 v/as added, Further investigation found that this negative effect may be caused by multiphase reactions emerging. 展开更多
关键词 catalytic oxidation P-XYLENE acetic acid carbon dioxide negative effect
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钯催化选择性构筑(Z)-[3]戟烯反应研究
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作者 徐云芳 李阳 +3 位作者 付梓桐 林绍艳 祝洁 吴磊 《化学学报》 SCIE CAS CSCD 北大核心 2022年第10期1369-1375,共7页
本工作发展了钯催化下芳甲醛对甲苯磺酰腙与膦酰基取代联烯的偶联反应,顺利地以中等至良好的收率及较高的立体选择性制备了一系列(Z)-[3]戟烯衍生物.不同于烷基取代的苯磺酰腙与烯烃的简单偶联,该反应使用芳甲醛对甲苯磺酰腙作为底物,经... 本工作发展了钯催化下芳甲醛对甲苯磺酰腙与膦酰基取代联烯的偶联反应,顺利地以中等至良好的收率及较高的立体选择性制备了一系列(Z)-[3]戟烯衍生物.不同于烷基取代的苯磺酰腙与烯烃的简单偶联,该反应使用芳甲醛对甲苯磺酰腙作为底物,经由1,3-钯迁移历程成功构筑了两个C=C双键.在最优反应条件下,该反应展示了较宽的底物适用范围和较高的立体选择性.最终以31个反应实例获得一系列(Z)-[3]戟烯衍生物,最高79%分离产率和>20∶1 Z/E选择性,为(Z)-[3]戟烯衍生物的合成应用提供了简便高效的方法. 展开更多
关键词 戟烯衍生物 甲醛对甲苯磺酰腙 膦酰基取代联烯 钯催化 立体选择性
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Efficient aerobic oxidation of 5-hydroxymethylfurfural to 2,5-furandicarboxylic acid on Ru/C catalysts 被引量:9
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作者 Lufan Zheng Junqi Zhao +2 位作者 Zexue Du Baoning Zong Haichao Liu 《Science China Chemistry》 SCIE EI CAS CSCD 2017年第7期950-957,共8页
2,5-Furandicarboxylic(FDCA) is a potential substitute for petroleum-derived terephthalic acid, and aerobic oxidation of5-hydroxymethylfurfural(HMF) provides an efficient route to synthesis of FDCA. On an activated car... 2,5-Furandicarboxylic(FDCA) is a potential substitute for petroleum-derived terephthalic acid, and aerobic oxidation of5-hydroxymethylfurfural(HMF) provides an efficient route to synthesis of FDCA. On an activated carbon supported ruthenium(Ru/C) catalyst(with 5 wt% Ru loading), HMF was readily oxidized to FDCA in a high yield of 97.3% at 383 K and 1.0 MPa O_2 in the presence of Mg(OH)_2 as base additive. Ru/C was superior to Pt/C and Pd/C and also other supported Ru catalysts with similar sizes of metal nanoparticles(1–2 nm). The Ru/C catalysts were stable and recyclable, and their efficiency in the formation of FDCA increased with Ru loadings examined in the range of 0.5 wt%–5.0 wt%. Based on the kinetic studies including the effects of reaction time, reaction temperature, O_2 pressure, on the oxidation of HMF to FDCA on Ru/C, it was confirmed that the oxidation of HMF to FDCA proceeds involving the primary oxidation of HMF to 2,5-diformylfuran(DFF) intermediate, and its sequential oxidation to 5-formyl-2-furancarboxylic acid(FFCA) and ultimately to FDCA, in which the oxidation of FFCA to FDCA is the rate-determining step and dictates the overall formation rate of FDCA. This study provides directions towards efficient synthesis of FDCA from HMF, for example, by designing novel catalysts more efficient for the involved oxidation step of FFCA to FDCA. 展开更多
关键词 aerobic oxidation 5-hydromethylfurfural 2 5-furandicarboxylic supported Ru catalyst base additives reaction mechanism
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