共查询到19条相似文献,搜索用时 109 毫秒
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1,2-二氯乙烷反应精馏制备1,1,2-三氯乙烷 总被引:1,自引:0,他引:1
以1,2-氯乙烷和氯气为原料,用反应精馏法制备1,1,2-三氯乙烷,并考察了反应温度,1,2-氯乙烷进料位置、填料类型和空塔气速对反应的影响。结果表明,较好的条件为1,2-氯乙烷进料位置在塔的中上段,反应段温度为105-110℃,增大空塔气速和使用规整填料能明显提高1,1,2-三氯乙烷的选择性和生成速率。 相似文献
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美国癌协会最近的研究表明:从统计学上看有四种氯乙烷在动物中引起严重致癌,这四种化合物是:1,2-二氯乙烷、1,1,2-三氯乙烷、1,1,2,2-四氯乙烷和六氯乙烷,美国国家职业安全卫生协(NIOSH)根据美国癌协会的这一研究,建议工厂车间将这四种氯乙烷作为致癌物处理,NIOSH还建议严格 相似文献
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采用浸渍法制备系列不同负载量的Fe/ZrO2催化剂,用于气相催化裂解1,1,2-三氯乙烷脱氯化氢性能的研究。结果表明,反应温度为350℃时,负载Fe质量分数为1%的1Fe/ZrO2催化剂催化活性最好,1,1,2-三氯乙烷转化率约95.0%,顺式1,2-二氯乙烯选择性为91.0%,反应50h性能稳定不失活,1,1,2-三氯乙烷转化率约92.0%,顺式1,2-二氯乙烯选择性约90.0%。单一ZrO2载体上的脱氯反应初始转化率为90.0%,经过1h反应即快速失活。ZrO2催化剂失活归因于ZrO2表面酸性较强导致积炭。对于Fe/ZrO2催化剂,Fe物种不但提供新的活性位点,而且降低了催化剂的表面强酸性中心,使催化剂催化活性更高,稳定性更好。 相似文献
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塔式法合成1,1,2—三氯乙烷的研究 总被引:1,自引:0,他引:1
本文提出了用塔式反应器由氯乙烯氯化合成1,1,2—三氯乙烷的新方法,克服了目前常用的液相法或气相法合成的缺点。研究中考察了影响合成收率的主要因素,获得了合成1,1,2—三氯乙烷的最佳工艺条件。在该条件下,合成收率超过95%,整个工艺过程的总收率达90%,所得产品纯度高,能完全满足需要。 相似文献
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改进了利用活性炭吸附-二硫化碳解吸-气相色谱/电子捕获检测器(GC/ECD)测定环境空气中反式-1,2-二氯乙烯、1,1-二氯乙烷、顺式-1,2-二氯乙烯、三氯甲烷、1,1,1-三氯乙烷、四氯化碳、1,2-二氯乙烷、三氯乙烯、1,2-二氯丙烷、1-溴-2-氯乙烷、1,1,2-三氯乙烷、四氯乙烯、氯苯、三溴甲烷、1,1,2,2-四氯乙烷、1,2,3-三氯丙烷、1,3-二氯苯、1,4-二氯苯、苄基苯、1,2-二氯苯、六氯乙烷这21种挥发性卤代烃的分析方法。所建立的方法在一定浓度范围内工作曲线线性良好,相关系数均在0.995 7~0.999 9之间,加标回收率在80.4%~113.3%之间,RSD为1.0%~6.6%,检出限为6.17~29.25μg/m3。所建立的方法操作简便、分析快速、灵敏度高,且具有较好的精密度与准确性。 相似文献
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《山东化工》2015,(14)
建立了顶空——气相色谱法测定化工废水中偏二氯乙烯、1,1,1-三氯乙烷、三氯乙烯、1,1,2-三氯乙烷、1,1,2,2-四氯乙烷的分析方法。化工废水中偏二氯乙烯、1,1,1-三氯乙烷、三氯乙烯、1,1,2-三氯乙烷、1,1,2,2-四氯乙烷经DB-624(30m×320μm×1.80μm)毛细管柱气相分离,用保留时间定性,外标法定量。实验结果表明,几种物质在其测量范围内与对应的峰面积呈良好的线性关系,检出限分别为0.08、0.006、0.009、0.50、0.004μg/L。该方法的精密度和准确度较高,相对标准偏差小于2%,加标回收率在95.0%~102.4%之间。 相似文献
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L. M. Kartashov Yu. A. Treger M. R. Flid A. A. Koblov T. L. Kalyuzhnaya 《Catalysis in Industry》2009,1(3):201-206
To develop technology for the utilization of waste from vinyl chloride production by the method of catalytic hydrodechlorination,
the main aspects of kinetics are studied, which makes it possible to describe the process of exhaustive catalytic hydrodechlorination
on a Pd/γ-Al2O3 catalyst. Conditions are determined that provide stable work of the catalyst and the complete extraction of chlorine from
waste: excess hydrogen of ∼270°C and a contact time of 10–15 s. The process does not require high pressure. The rate of chlorinated
hydrocarbon consumption in the process of hydrodechlorination of the main components of waste (1,2-dichloroethane, 1,1,2-trichloroethane,
and tetrachloroethylene) is measured at 200–270°C. Mathematical equations for simulations of the hydrodechlorination reactor
unit are obtained. The results can be used to develop an experimental pilot plant. 相似文献
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研制了一种可耐多种强极性溶剂的双组分环氧树脂(EP)防腐粘接涂层,其不仅能经受丙酮、甲苯等极性溶剂的长期浸泡,而且对甲醇、1,1,2-三氯乙烷和四氢呋喃等强极性溶剂也具有良好的防腐功效。试验结果表明:该高固含量环保型EP粘接涂层具有不含溶剂、与金属之间的粘接强度较高(剪切强度超过18 MPa、拉伸强度超过45 MPa)、固化涂层的收缩率较低、可室温固化以及操作方便等优点,是一种非常理想的防腐粘接涂层。 相似文献
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Chlorinated and brominated volatile organic compounds are among the groundwater pollutants creating major environmental problems. In this study, dynamic behavior of certain volatile organic compounds in water was investigated by using a novel moment technique. Adsorption equilibrium constant and the penetration length of tracers were evaluated by the first absolute and the second central moment expressions derived for a pulse-response system. In order to obtain adsorption equilibrium constant and penetration length, pulse-response experiments were carried out with different tracers in a one-sided adsorption cell at 30°C. The adsorption equilibrium constants at the gas-water interface were calculated for 1,2-dichloroethane, 1,1,1-trichloroethane, and carbon tetrachloride. This study showed that the adsorption equilibrium constant and the penetration length values could be successfully evaluated using the one-sided adsorption cell moment technique. The adsorption equilibrium constant for 1,2-dichloroethane, 1,1,1-trichloroethane, and carbon tetrachloride were found to be 0.30, 0.49, and 0.54 cm3/cm2, respectively. 相似文献
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T. E. VITTAL PRASAD D. H. L. PRASAD J. KISHORE BABU SREERAM BANARJEE 《Chemical Engineering Communications》2013,200(10):1323-1328
Bubble temperatures at 95.8?kPa over the entire composition range were measured for the binary mixtures formed by 1,2-dimethylbenzene with 1,2,-dichloroethane, 1,1,1-trichloroethane, 1,1,2,2-tetrachloroethane, trichloroethylene, and tetrachloroethylene using a Swietoslawski type ebulliometer. The liquid phase composition versus temperature measurements are accurately represented by the Wilson model. 相似文献
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T. E. Vittal Prasad D. H. L. Prasad Vachaspati B. Vamsi Krishna 《Chemical Engineering Communications》2005,192(2):168-173
Bubble point temperatures at 94.6 kPa over the entire composition range are measured for the binary mixtures formed by sec-butanol with 1,2,-dichloroethane, 1,1,1,-trichloroethane, 1,1,2,2-tetrachloroethane, trichloroethylene, and tetrachloroethylene, making use of a Swietoslawski-type ebulliometer. The liquid phase composition versus temperature measurements are found to be well represented by the Wilson model. 相似文献
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分析计算了精馏分离氯仿-二氯乙烷过程中塔板数和回流比对其汽液相平衡的灵敏度,计算结果显示,要设计一台合适的普通精馏塔,现有的相平衡数据精度不够,但其精度可满意萃取精馏塔的设计要求。 相似文献
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In this work the photochemical chlorination of 1,1-dichloroethane to 1,1,1-trichloroethane in the gas-phase is investigated. It can be shown, that in the analysis of this reaction system exponential equations for the reaction rates are in practice superior to equations based on mechanistical considerations. The use of lower reactant concentrations leads to higher selectivities for this reaction; quantum yields of 104 and more permit the use of weak lamps. 相似文献