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采用单因素实验研究了亚硫酸铵初始浓度、反应温度、空气流量、催化剂硫酸钴浓度等因素对催化氧化亚硫酸铵的效率的影响.结果表明,低浓度亚硫酸铵较易氧化,亚硫酸铵浓度越高,氧化越困难;反应的最佳温度为50℃,氧化速率随着空气流量和催化剂硫酸钴浓度的增加而加快.通过正交实验确定最佳氧化反应条件为:亚硫酸铵初始浓度1.1 mol·L-1,催化剂硫酸钴浓度0.015 mol·L-1,反应温度50℃. 相似文献
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通过半连续实验考察了对二甲苯(PX)二次氧化过程中的液相氧化,并对该过程进行了模拟计算。设计和进行了包含PX液相氧化、中断反应以及降温二次液相氧化三个阶段的实验;通过动力学实验测定和数据回归确定了基于芳烃氧化自由基链式反应机理的PX液相氧化动力学模型的参数;采用建立的PX液相氧化机理模型对PX分段氧化过程进行了预测。结果表明,对中断反应后的降温二次液相氧化间歇过程,采用第一阶段末期自由基浓度做初值时模型预测值与实验值符合良好;而假设自由基初值浓度为零时,PX液相氧化动力学模型对二次氧化的液相反应预测效果较差,其原因可能是中断降温后的氧化母液中存在过氧基团会使二次液相氧化反应极快地被再引发启动。 相似文献
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Fe2+液相催化氧化脱除烟气中SO2 总被引:5,自引:0,他引:5
提出了一种烟气脱硫新工艺。实验选用水作脱硫剂 ,在只以Fe为催化剂的条件下进行。加入吸收液槽中的铁屑可与脱硫产生的稀硫酸进行反应 ,不仅可维持较高的吸收液pH值 ,而且产生的Fe2 + 引发了液相催化氧化SO2 反应。连续运行实验结果表明脱硫过程在不同阶段分别受SO2 溶解、Fe2 + 液相催化氧化SO2 反应、气相中SO2 扩散和铁屑与酸反应控制。吸收液中Fe2 + 质量浓度的变化和初始Fe2 + 质量浓度对脱硫率及吸收液pH值影响显示 ,可直接由清水制取高浓度硫酸亚铁溶液。实验还调查了SO2 入口质量浓度、液气比、空塔气速和吸收温度对脱硫率和吸收液pH值的影响 相似文献
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生产胶体五氧化二锑适宜条件与稳定剂的实验研究 总被引:3,自引:0,他引:3
应用正交设计实验法对回流法生产胶体五氧化二锑的适宜条件进行了实验研究。优选了Sb_2O_3浓度、H_2O_2加入量与起始反应温度、并以碳酸钠为稳定剂,取得了良好的试验效果。 相似文献
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对湿法脱硫工艺的氧化再生过程进行了实验研究,通过单因素试验考察了温度、氧硫摩尔比、pH和酞菁钴四磺酸钠(PDS)质量浓度对再生效率的影响。基于单因素实验结果设计了四因素三水平正交实验,结果发现温度是影响氧化再生过程的关键因素,其次是氧硫摩尔比和p H,而PDS质量浓度的影响最小。最佳脱硫条件是氧硫摩尔比为1. 25、PDS质量浓度为60mg/L、pH为8. 6、温度为18℃,对应的再生效率为83. 8%。对HS-的氧化再生过程进行了机理分析,提出控制多硫离子氧化是降低副盐生成的关键。最后对实际工厂脱硫氧化过程分析发现,其脱硫效率仅为55%,温度和氧硫摩尔比与实验最佳条件存在很大差异。 相似文献
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TiO2光催化氧化降解偶氮染料废水的研究 总被引:3,自引:0,他引:3
李娄刚 《化学工业与工程技术》2008,29(2):11-14
以偶氮染料直接耐酸大红4BS模拟废水为研究对象,以TiO2为光催化剂,紫外灯作光源(80W),探究了不同TiO2催化剂的用量、光照时间、溶液初始pH值及废水初始质量浓度等因素对偶氮染料废水降解率的影响。实验结果表明,偶氮染料直接耐酸大红4BS废水的最佳处理条件为:TiO2催化剂质量浓度1.2g/L,光照时间120min,初始pH值10,废水初始质量浓度20mg/L。在最佳处理条件下,对某染料厂的实际工业废水样进行了降解率的测定,得出其降解率在90%以上。 相似文献
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水溶性偶氮染料的脱色降解是印染行业废水处理的技术瓶颈。研究水溶液中加入H2O2,氯过氧化物酶高效催化氧化偶氮染料(橙黄Ⅳ和皂黄)的主要发色基团的性能,探讨影响染料降解率的主要因素pH、温度、H2O2用量、氯过氧化物酶用量、染料初始浓度和反应时间等。结果表明,加入H2O2,氯过氧化物酶对橙黄Ⅳ和皂黄具有较好的脱色降解效果,橙黄Ⅳ在5 min的脱色率达91.02%,皂黄在7 min的脱色率达88.83%。通过液质联用技术测定了橙黄Ⅳ染料降解的中间产物及最终产物,并以此对降解途径进行初步推测。 相似文献
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This study investigated the treatment of an azo dye, as a biorecalcitrant model, from industrial wastewater by using Cu/Mg/Al-chitosan in a fluidized catalyst-bed reactor. A number of variables were used to study the impact they had on the oxidation process involving azo dye. The maximum degradation of the azo dye was achieved at 7 g Cu/Mg/Al-chitosan. The chloride and sulfate ions had a synergistic effect on azo dye removal. The oxidation of the azo dye under the selected conditions was of pseudo-first-order. Textile wastewater could effectively be treated using a low concentration of about 7 g of Cu/Mg/Al-chitosan in a short hydraulic retention time of 10 min. The use of Cu/Mg/Al-chitosan demonstrated a promising method to eliminate the azo dye from the wastewater. 相似文献
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Jie Zhang Shuzhong Wang Yang Guo Donghai Xu Yanmeng Gong Xingying Tang 《Coloration Technology》2012,128(4):323-330
Supercritical water oxidation of azo dye CI Reactive Orange 7 solution was investigated in a batch reactor. Response surface methodology was employed for the experimental design. Quadratic polynomial equations were established based on the results of the experiments. Optimisation of the process was then conducted in accordance with the simulated equations. The results show that removal of chemical oxygen demand, total organic carbon and total nitrogen can be achieved up to 99, 95 and 69%, respectively, and the predictive data were in reasonable agreement with the experimental results. It seems that response surface methodology is useful and feasible for the optimisation of CI Reactive Orange 7 dye wastewater supercritical water oxidation processing. The gas chromatography/mass spectrometry analysis results show that a large amount of 2,4‐pentadienenitrile with diazo formed during the CI Reactive Orange 7 supercritical water oxidation reaction, which suggested that the azo firstly reacted to the diazo, and then converted into the final product of nitrogen. 相似文献
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《分离科学与技术》2012,47(14):2220-2229
Fe(III)/H2O2 system is an effective method for separating the organic compounds from aqueous solution, whereas it is often investigated under lower pH conditions. In order to improve performance of the system, a Fe(III)/H2O2-like system that was composed of iron-based coagulant and H2O2 was developed, which has the combined effect of flocculation and oxidation. The system when used for decolorization of an organic azo dye solution, Procion Red MX-5B, under wider pH range, indicated higher decolorization efficiency. Parameters affecting the decolorization such as coagulant dosage, H2O2 concentration, initial solution pH, temperature, and initial dye concentration were examined in this study. The results indicated that with appropriate coagulant dosage, H2O2 concentration, and pH, it was more effective for the decolorization, especially in a weak alkaline environment (pH = 7-8); the pseudo-first-order kinetics could express the azo dye concentration as a function of the reaction time. This study further illustrated that the azo dye solution was degraded to a degree with 53.22% TOC removal at an initial total TOC concentration of 14.92 mg/L. Overall, the established system in this study was favorable to the decolorization of soluble azo dye. 相似文献
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以玉米淀粉为原料、以过氧化氢和过硫酸钾为复合氧化剂、以Fe2+为催化剂,在酸性条件下采用微波辅助复合氧化法合成氧化玉米淀粉。以反应温度、微波催化合成/萃取仪功率、催化剂质量分数(占干淀粉总量,下同)、复合氧化剂质量分数(占干淀粉总量,下同)、淀粉乳浓度、体系pH值、反应时间等因素为变量,以氧化度为衡量指标,采用单因素实验和正交实验确定微波辅助复合氧化法合成氧化玉米淀粉的最佳工艺条件为:反应温度55℃、微波催化合成/萃取仪功率400 W、催化剂质量分数0.3%、复合氧化剂质量分数8%、淀粉乳浓度45%、体系pH值4.00、反应时间21min,在此条件下,可以制得氧化度为0.140%的氧化玉米淀粉。 相似文献
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以玉米淀粉为原料、以过氧化氢和过硫酸钾为复合氧化剂、以Fe2+为催化剂,在酸性条件下采用超声波辅助复合氧化法合成氧化玉米淀粉。以淀粉乳浓度、复合氧化剂质量分数(占干淀粉总量,下同)、体系pH值、数控超声波清洗器功率、催化剂质量分数(占干淀粉总量,下同)、反应温度、反应时间为考察因素,以氧化度(羧基含量)作为衡量指标,采用单因素实验和正交实验确定超声波辅助复合氧化法合成氧化玉米淀粉的最佳工艺条件为:淀粉乳浓度30%,复合氧化剂质量分数10%,体系pH值3.OO,数控超声波清洗器功率90w,催化剂质量分数0.3%,反应温度55℃,反应时间40rain,在此条件下,可以制得氧化度为0.203%的氧化玉米淀粉。 相似文献
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María ngeles Sanromn Marta Pazos Claudio Cameselle 《Journal of chemical technology and biotechnology (Oxford, Oxfordshire : 1986)》2004,79(12):1349-1353
The decolourisation of an azo dye, Methyl Orange, by an electrochemical technology was studied in a reaction cell with a working volume of 1 dm3, using graphite for both electrodes (anode and cathode). No decolourisation was detected in the treatment of pure solutions of Methyl Orange, but significant decolourisation was observed in the presence of NaCl, the influence of which was established. The extent of decolourisation, treatment time, and electrical consumption largely depended on the applied potential difference; the optimum value being around 5V. To achieve effective decolourisation, the NaCl concentration should be increased as the concentration of azo dye increases. Thus, almost complete decolourisation was achieved in 60 min for an effluent containing 40 kg m?3 NaCl and 90 g m?3 of dye. Increasing temperature (from 20 to 40°C) did not improve the efficiency of electrochemical oxidation. Copyright © 2004 Society of Chemical Industry 相似文献