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针对氧化锌易溶于氨-碳酸氢铵混合溶液中生成锌氨配合物这一特点,采用含锌废催化剂为原料,经化浆、高剪切分散后加入氨-碳酸氢铵溶液浸取,通过沉淀除杂、锌粉置换和热解蒸氨得到碱式碳酸锌。考察了高剪切分散机剪切速率、反应温度、浸取剂pH和浸取时间对锌浸出率的影响。结果表明,在剪切速率为25 000 r/min、反应温度为328 K、浸取剂pH=7.5、浸取时间为2 h的条件下,锌浸出率可达90%以上,制备的碱式碳酸锌优于HG/T 2523—2007《工业碱式碳酸锌》标准要求。该研究综合利用了含锌废催化剂,无二次污染产生,符合清洁生产和资源合理利用的要求。 相似文献
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从合成甲醇废催化剂中回收铜锌 总被引:1,自引:0,他引:1
从合成甲醇废催化剂中回收铜锌王晓宁(盘锦市工业研究所,盘锦124010)1前言催化剂是具有改变化学反应速度而自身质量、组成均不发生变化的一类物质。不同的化学反应采用不同的催化剂。随着国民经济的迅速发展,我国的甲醇行业已形成50万t/a的生产能力,其中... 相似文献
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本文报导一种新法利用废铂催化剂,经过焚烧、酸溶、沉淀、提纯、焙烧等制备贵金属铂的工艺流程及操作步骤。该方法,操作简单、成本低,回收率高,铂的纯度通过纯化可高达99.99%。 相似文献
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介绍了采用甲酸沉淀法从废铂催化剂中制备高纯度铂的方法。其操作简单,成本低,回收率可达99.6%,铂的纯度可达99.99%。 相似文献
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在国产阳原活性炭上浸渍乙酸锌溶液,以制备新的用于乙炔法生产乙酸乙烯的催化剂,得到了一个包含浸渍时间、浸渍比、浸渍温度、浸渍初始浓度的经验公式。选择了内循环无梯度反应器,对该国产乙炔法合成乙酸乙烯新型催化剂进行了评价,并选定了动力学实验条件,探索该国产催化剂和进口的BPL型催化剂上反应温度和分压对反应速率影响的规律,从而建立宏观动力学方程。 相似文献
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Toshio Kawaguchi Toshihisa Wakasugi 《Journal of chemical technology and biotechnology (Oxford, Oxfordshire : 1986)》1988,42(2):113-127
A continuous manufacturing method of an activated carbon supported zinc acetate catalyst has been established. Based on the dipping of a crushed activated palm carbon into a zinc acetate aqueous solution, the catalyst is prepared for the synthesis of vinyl acetate from acetylene in an industrial fluidized reaction vessel. The relationship between the supported amount of zinc acetate and various factors has been studied. Based on these results, an empirical formula was developed. Using this formula, the continuous manufacturing apparatus was designed and constructed for the purpose of preparing the optimum supported fluidized catalyst. To minimize the activated carbon loss due to crushing and wearing, a vibrating conveyor system was employed. This continuous manufacturing process produced a uniform catalyst with an activated carbon feed rate of 0.25 m3 h?1. Using this catalyst, a series of operational tests of the vinyl acetate synthesis was performed for investigating the optimum reaction conditions. These operational tests were carried out using an industrial fluidized reaction vessel of 3.28 m diameter and 50 tons day?1 vinyl acetate production capacity. Based on these test results, the reaction rate constant and the deterioration rate constant were newly introduced, and the optimum operation conditions were then determined. 相似文献
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介绍了从催化氧化法生产葡萄糖酸钠的废钯碳催化剂中回收钯的方法,着重对焚烧法回收钯的方法作了研究。用此法回收的海绵钯质量分数达到99.95%,批量回收的回收率达到98%,在一定程度上降低了葡萄糖酸钠的生产成本。 相似文献
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从乙炔法合成醋酸乙烯酯反应机理出发,结合中国石化集团四川维尼纶厂生产实际情况,重点探讨了活性组分Zn(OAc)2含量、催化剂的配制过程、催化剂的粉化、催化剂床层温度等对催化剂活性的影响。提出改进催化剂载体结构、优化催化剂的配制、增加活性组分Zn(OAc)2含量、严格控制工艺条件等措施,从而提高产品产量。 相似文献
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采用微波、超声波联用技术对醋酸乙烯废触媒进行脱附处理,同时采用微波技术加热活化回收活性炭,测定了不同技术回收的活性炭的亚甲蓝脱色力。结果表明,一次微波两次超声波联用技术处理醋酸乙烯废触媒,即微波高火力、时间15 min、固液比1∶4(质量比)和超声波功率120 W、时间60 min、固液比1∶4(质量比)、作用面积91.56 cm2时,锌的洗脱率最高、活性炭的脱色力最高,与传统的煅烧法相比,采用微波高火力,15 min活化回收的活性炭其亚甲蓝脱色力为9.5 mL/0.1 g,达到国家林业局粉状活性炭二级标准(LY216—79)。 相似文献
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合成乙酸异戊酯的催化剂研究 总被引:12,自引:3,他引:12
综述了浓硫酸 ,NaHSO4 ·H2 O、CuSO4 、FeCl3 ·6H2 O ,磺化聚苯乙烯 ,对甲苯磺酸 ,氨基磺酸 ,固体超强酸TiO/SO4 2 -,钨锗杂多酸 ,TiSiW12 O4 0 /TiO2 等十种不同催化剂催化合成了乙酸异戊酯的实验结果。结果表明 :TiSiW12 O4 0 /TiO2 和NaHSO4 ·H2 O两种催化剂对合成乙酸异戊酯的酯收率较高 ,具有实际应用价值 相似文献
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Xinhui Duan Zebiao Zhang C. Srinivasakannan Fei Wang Jinsheng Liang 《Chemical Engineering Research and Design》2014
Optimization of the process of regeneration of spent catalyst from vinyl acetate synthesis was attempted using response surface methodology (RSM) based on the central composite design (CCD). The optimization was performed to maximize the response variables of methylene blue (MB) adsorption capacity as well as the yield of the porous carbon, with the process variables being regeneration temperature, regeneration duration and steam flow rate. The two factor interaction model and quadratic model were developed to correlate the process variables with the response variables. Based on the analysis of variance (ANOVA), all the three process parameters were found to be significant. The optimized process conditions were identified to be activation temperature of 946 °C, activation time of 30 min and steam flow rate of 2.4 g min−1 with MB adsorption capacity of 420 mg/g and a yield of 50.7%. The MB adsorption capacity as compared with the majority of the literature reported values, along with high yield of the regenerated carbon, certify the economic feasibility of the process, with potential application in variety of liquid phase adsorption processes. 相似文献
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高效催化剂对切片性能的影响 总被引:1,自引:0,他引:1
研究了在1万t/a连续聚酯装置上使用高效催化剂合成的半消光切片的相对分子质量及其分布、结晶性能、流变性能以及热稳定性能,并与相同装置由常规催化剂合成的切片相对比。高效催化剂与常规催化剂制备切片具有相同的相对分子质量及其分布、结晶机理和流变性能。2种催化剂制备切片的热分解稳定性基本相同,高效催化剂制备切片的热降解稳定性略逊于常规催化剂切片,但可以满足纺丝加工要求。从总体上看,使用高效催化剂不会影响切片的内在质量。 相似文献
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无机盐催化合成乙酸正丁酯的研究 总被引:1,自引:0,他引:1
研究了FeCl3 ·6H2 O、CuCl2 ·2H2 O、CuSO4·5H2 O、CuSO4、FeSO4·7H2 O、ZnSO4·7H2 O等无机盐对正丁醇与乙酸酯化反应的催化作用 ,研究表明 :FeCl3 -CuCl2 的复合物有较好的催化性能 ,在连续酯化 -精馏装置中 ,催化剂有很高的活性 ,运行 15 0h后仍具有很好的稳定性和寿命 相似文献