共查询到17条相似文献,搜索用时 93 毫秒
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一、概述氯溶剂中的三氯乙烯适用于金属脱脂,但是用于轻金属和有色金属的脱脂还是近年来取得的最佳效果。其原因是三氯乙烯本身的物化性质有着不良的影响,如三氯乙烯不稳定,纯净的三氯乙烯分解较慢,但一般工业品三氯乙烯(即使无水的三氯乙烯)与空气或氧接触时分解却很快。 相似文献
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介绍了三氯乙烯的性质和生产方法;并对各种生产方法进行比较,找出适合我国国情的生产工艺路线。分析了国内外三氯乙烯的生产消费现状及市场前景,提出发展我国三氯乙烯生产的一些建议。三氯乙烯项目要进行总量控制,保持供求整体平衡;提高生产技术水平,降低生产成本,提高产品质量;拓展三氯乙烯应用领域,提高产品附加值;建立信息交流平台。 相似文献
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Summary An accurate method for determining small amounts of trichloroethylene in vegetable oils has been presented. The method employs
a distillation procedure to separate the trichloroethylene from the oil and a colorimetric procedure based on the Fujiwara
reaction to determine the trichloroethylene in the distillate. The method has been tested on known samples of crude and refined
soybean and cottonseed oils varying in trichloroethylene content from 0.001% to 0.6% with excellent results. 相似文献
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In this research, the ozonation–sorption technology for water purification to remove trichloroethylene and tetrachloroethylene is presented. Physical and chemical (kinetic) parameters of consecutive ozonation and sorption of trichloroethylene and tetrachloroethylene from water are determined. The optimum technological parameters of this method for the purification of water from trichloroethylene and tetrachloroethylene are developed. R&D were carried out using water from 12 underground wells nearby Podolsk, Moscow region (Russia). 相似文献
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三氯乙烯国内外市场分析 总被引:2,自引:0,他引:2
三氯乙烯消费在发达国家已达饱和。在我国,其消费动力主要来自于作为化工中间体,如合成新型环保制冷剂HFC-134a,需求年增长率达10.7%。因此有反倾销的案例发生。该产品有良好的市场前景,但生产企业应立足改进生产技术,降低成本,增强产品的市场竞争力。 相似文献
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A new technique, quasielastic light scattering, was employed to study the aggregation behaviour of three acid dyes in dimethylformamide—trichloroethylene solvent mixtures. Observations on the aggregation of these dyes showed that they behaved differently in these mixtures than in aqueous solution. The extent of aggregation was found to vary with the number of sulphonic acid groups present in the dye molecule. Both monosulphonated and disulphonated acid dyes showed a tendency to aggregate with increase either in dye concentration or in trichloroethylene content in dimethylformamide. The low dielectric constant of trichloroethylene was responsible for the tendency of dye to aggregate with increase in trichloroethylene content. The trisulphonated acid dye showed least tendency to aggregate; this may be accounted for by the fact that sulphonic acid groups in the dye molecule are located at sites unfavourable to aggregation. 相似文献
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《分离科学与技术》2012,47(15):2497-2512
Abstract Vapor extraction of volatile organic compounds from soil was investigated by performing adsorption and desorption experiments of trichloroethylene, trichloroethane, and chlorobenzene on soil particles. The adsorption breakthrough curves were obtained using a dynamic response technique based on frontal analysis chromatography. The shape of the breakthrough curves indicated that the adsorption process was close to an ideal adsorption system of no mass transfer resistance, no axial dispersion, and infinitesimal width of mass transfer zone. The adsorption isotherms were BET Type I for trichloroethylene and trichloroethane, and BET Type II for chlorobenzene. Two types of desorption profiles were observed depending on the compounds, i.e., the continuously decreasing profiles of trichloroethylene and trichloroethane and the stepwise decreasing profiles of chlorobenzene. The desorption profiles of trichloroethylene and trichloroethane were simulated using a local equilibrium theory which indicated that desorption behavior was independent of the number of adsorption layers on soil. For chlorobenzene, the monolayer desorption was the rate-controlling step of the overall desorption process. The effect of moisture on desorption efficiency was significant for chlorobenzene, which showed more unfavorable desorption behavior than trichloroethylene and trichloroethane. 相似文献