共查询到19条相似文献,搜索用时 140 毫秒
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介绍了由金属钴原料直接合成、提纯高纯氯化钴的生产工艺及杂质去除质原理和方法,用此工艺生产的氯化钴,各项指标均达到国家标准。 相似文献
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有机钴盐如醋酸钴、环烷酸钴等由醋酸、环烷酸与氢氧化钴中和反应制得,有机钴合成用的氢氧化钴要求为微米级、无氧化、氯含量低。研究了合成有机钴所需的低氯、微米级氢氧化钴的制备方法,考察了氨络合作用、料液加入顺序、还原剂、累计生长时间等参数对产品中氯含量、微观结构、氧化程度的影响。以水合肼为还原剂,钴液、氨水、液碱并流加入反应釜,控制反应pH为10.5~11.5、铵根质量浓度为6~9 g/L,晶体生长40 h后,得到玫瑰红色的氢氧化钴产品,其微观结构为六方晶体,氯质量分数为0.017%。 相似文献
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本文提出以新的工艺路线,在水介质中合成了T-527橡胶-钢丝粘合促进剂粉剂并采用了直接压制成型方法制成了锭剂,改变了在有机溶剂中合成和使用粘着物质或熔融滴粒成型的工艺。所研制的T-527钴硼粘合促进剂经化学与光谱分析,与文献上提出的钴硼粘合促进荆组成相一致。亦与国际上著名的英国M-680C锭剂实物相一致。其钴含量为现用的环烷酸钴的三倍左右。经过性能试验表明:在门尼焦烧、多次压缩生热、抗温湿老化等性能上均优于英国M-680C实物。在钢丝抽出力上与M-680C实物相当,而且在所有物理性能和机械强度指标上皆优于现用的环烷酸钴。T-527钴硼粘合促进剂可用于橡胶与赤裸钢丝的粘合,更可使用于镀铜钢丝和镀锌锕丝,其在胶料中溶解度大,易分散,便于操作,且使用中损耗小,可降低成本。 相似文献
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均相催化剂环烷酸钼的制备 总被引:1,自引:0,他引:1
本文介绍了以环烷酸,草酸和三氧化钼为原料制备均相催化剂环烷酸钼的方法。首先用皂化法和蒸馏法对原料环烷酸进行精制,以提高酸值,然后以反应时间,反应物摩尔比,反应物酸值和反应温度等因素进行正交试验,以获得最佳试验条件和方案,最终使环烷酸钼的钼含量达到6.25%,试验证明它对丁烯的环氧化过程中确实起了催化作用。 相似文献
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Ekhlas Eltayeb Alireza Mahdavian Hengameh Honarkar 《Polymer-Plastics Technology and Engineering》2013,52(7):718-724
The effect of cobalt naphthenate on photo degradation of low density polyethylene was studied. The carbonyl index, tensile strength, elongation at break, density and relative crystallinity of the samples were measured. The samples were made of different concentrations of LDPE and cobalt naphthenate. Parts of uniform thickness were cut for testing before and after UV-irradiation at every 30-days interval for 90 days. From the results of FTIR, and other measurements, it was observed that the UV-irradiation affects on the LDPE films and the rate of degradation increased with increasing both the concentration of the photosensitizer and time of irradiation. 相似文献
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The influence of cobalt chloride concentration, total chloride concentration and sulphate in the electrolyte on cobalt deposition
were studied. The current efficiency increased and the overpotential for electrodeposition of cobalt decreased with increasing
cobalt chloride concentration. Only minor changes were observed with addition of sodium chloride to the cobalt chloride solution.
Sulphate electrolyte resulted in lower current efficiency and higher overpotential for electrodeposition when compared to
a similar cobalt chloride electrolyte. 相似文献
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羰基化法生产苯乙酸工艺中生成的废催化剂,含有大量有价值的钴元素。介绍一种从废催化剂中,采用黄钠铁矾沉淀法将铁除去,用萃取法将锰、钻分离,制备得到含结晶水的氯化钴,钴的回收率达90%以上。 相似文献
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本文对异辛酸钒、异辛酸钴和环烷酸钴三种促进剂进行了试验对比,表明异辛酸钒促进剂各方面性能都优于异辛酸钴和环烷酸钴促进剂。 相似文献
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The technique of hydrothermal stripping from mixed aqueous-organic systems is a promising method for synthexizing oxide ceramic powdcrs for high-performance applications.Some factors influcncing heterogeneous hydrothermal stripping with water from iron-loaded organic phase of naphthenic acid-isooctyl alcohol-kerosenc,such as initial concentrations of iron and naphthenic acid,concentration of Fe2O3“seed”,temperature and time,were investigated.Baseed on the experimental results,the rate equation was established.Nano-ferric oxide powders were obtained by the technique of hydrothermal stripping from the iron-loaded organic phase.The results suggest that the heterogeneous hydrothermal stripping proceeds in 3 steps:adsorption of naphthenic acid dimers and naphthenic complex of iron onto the surface of “seed”,hydrolysis of adsorbed complex of iron,and condensation of hydrolyzed complex.The process activation energy is 115kJ/mol and the heterogeneous hydrothermal stripping is controlled by a chemical reaction(the hydrolysis of naphthenic complex of iron). 相似文献
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异辛酸钴的制备和应用 总被引:2,自引:0,他引:2
采用硫酸钴沉淀法制备异辛酸钴,并在水相与有机相的分离过程中添加助剂的方法,可使分离后有机相不经水洗即可彻底除去SO_4~(2-)离子,简化了工艺流程。介绍了异辛酸钴催干剂在4种醇酸磁漆中的应用及其性能检测结果。检测结果表明,异辛酸钴用于醇酸磁漆的性能指标达到或超过规定标准,尤其光泽、硬度两项指标优于同类产品水平,町作为环烷酸钴等常用催干剂的更新换代产品。 相似文献