共查询到19条相似文献,搜索用时 78 毫秒
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综述了近几年用于芳纶表面改性的物理方法的研究进展,重点介绍了表面涂层、等离子体处理、γ射线处理、超声波处理、紫外线辐射和超低温处理等改性方法的研究现状及优缺点,并对芳纶表面改性的发展趋势进行了展望。 相似文献
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在总结近年来染料废水研究文献的基础上,对化学氧化法处理该类废水的研究进行了概述,并展望了化学氧化法处理染料废水技术的发展前景. 相似文献
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用铅改性的Pd/C催化剂液相催化氧化乳酸,乳酸选择性转化为丙酮本以的收率可达到58%,同时对反应过程中影响丙酮酸生成的一些因素进行了探讨。 相似文献
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均三甲苯液相空气氧化合成均苯三甲酸 总被引:1,自引:0,他引:1
研究了在常压下,以醋酸钴和溴化钠为催化体系,均三甲苯液相空气氧化制备均苯三甲酸的反应工艺。利用酸值滴定、红外光谱和液相色谱等表征方法,确定产物为均苯三甲酸。通过对反应器的类型、催化剂、反应温度和时间等因素的考察,确定出该反应的最佳工艺条件为:采用鼓泡反应器,反应温度95℃,反应时间4.5h,n(均三甲苯)∶n(冰醋酸)∶n(醋酸钴)∶n(溴化钠)∶n(无水乙酸钠)=1∶35∶0.2∶0.1∶0.05,其中Co2+浓度为0.094mol/L。在以上反应条件下,均苯三甲酸的收率可达43 56%,酸值为752.39mg/g,纯度为96.46%。 相似文献
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究了KCIO3/糠醛及V2O5/MoO3摩尔比,反应温度,反应体系酸度,相转移催化剂,反应时间等因素对糠醛液相氧化合成富马酸的影响。实验证明反应温度,反应体系的酸度,TEBAC相转移催化剂用量是影响富马酸收率的主要因素。找出了最佳反应条件。富马酸收率82.9%,高于文献报道的最高收率(82.18%),反应时间从文献报道的10h缩短到2h。 相似文献
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阐述了用化学法制备相变材料微胶囊的最新研究进展,介绍了化学法制备相变材料微胶囊的方法,分析了制备的相变材料微胶囊的性能,并探讨了影响相变材料微胶囊性能的各种因素。最后,对化学法制备相变材料微胶囊的研究方向进行了展望。 相似文献
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氧气液相氧化蒽制取蒽醌的研究 总被引:5,自引:0,他引:5
在液相中,钴盐、锰盐、溴化物催化氧气氧化蒽制取蒽醌,当压力为0.5~0.8 MPa,溶剂是芳香性卤代烃和丁酸的混合物(其中丁酸质量分数为15% ~20% )时,蒽醌的产率可达90% ,纯度99.2% 。该混合溶剂对设备无腐蚀作用。 相似文献
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An estimation procedure of surface diffusion coefficient, Ds, in liquid phase adsorption was proposed. The procedure is based on a restricted diffusion model, in which Ds is correlated with molecular diffusivity by considering a restriction energy due to an adsorptive interaction between adsorbates and adsorbents. In some adsorption systems, Ds of different adsorbates could be calculated with an error less than about 50% from only one datum of each adsorption equilibrium constant. Irrespective of temperature, the procedure, can be applied for the estimation of Ds even in a wide range of Ds of about 4 orders of magnitude. 相似文献
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In this paper,shorter residence time(a few minutes)with high yield in the trickle bed process for per- acetic acid synthesis by acetaldehyde liquid phase oxidation can be realized on the selected packing material SA-5118.For acetaldehyde in acetone with ferric ion as catalyst,the optimized process conditions were presented. The main factors influencing the yield,selectivity and conversion are residence time,temperature and acetaldehyde concentration,respectively.The temperature range checked is from 30 to 65℃.High yield of 81.53%with high se- lectivity of 91.84?n be obtained at higher temperature of 55℃when the residence time is 5.5min and the acet- aldehyde concentration is 9.85%(by mass).And there is a critical acetaldehyde concentration point(Cccp)between 18%and 19.5%(by mass).At temperature less than 55℃,the highest yield to peracetic acid at each temperature level increases with temperature when the acetaldehyde concentration is below Cccp and decreases with temperature when the acetaldehyde concentration is above Cccp. 相似文献