三氯乙烯、四氯乙烯生产技术及市场分析

介绍三氯乙烯、四氯乙烯生产工艺和国内外三氯乙烯、四氯乙烯的市场现状及发展前景。     

三氯乙烯生产及应用现状

介绍了三氯乙烯的性质、生产方法及我国生产现状,根据市场发展及环境保护要求,指出三氯乙烯极具发展前景。     

市场动态

三氯乙烯总需求量看涨业界预计,三氯乙烯２０００年前后总需求将呈现增长势头。我国三氯乙烯生产起步较晚,１９８０年产量只有４０００多吨,１９９４年产量突破１００００吨,目前,我国只有十多家企业生产三氯乙烯,主要生产厂家有：锦西化工总厂、盐城电化厂、老河口化工厂、吉化公司电石厂、呼和浩特化工厂等,其中锦西化工总厂１９９４年三氯乙烯产量达到４０００吨,占全国产量的１／３左右,居首位。近年来,随着我国三氯乙烯生产的发展,每年有一定的进出口,由于国内市场不足,进口大于出口。我国三氯乙烯主要用于化工原料和革取…     

适合PVC企业转产的高附加值氯氢产品

重点介绍三氯乙烯、CPVC、EPVC及综合塑料加工项目的市场、技术及发展前景,这些产品和项目适合PVC企业转产。     

三氯乙烯复合稳定剂的研究

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。     

三氯乙烯稳定剂筛选试验

对三氯乙烯稳定剂进行对比试验,总结各种稳定剂在三氯乙烯体系中的作用,在稳定剂配方试验基础上,得出稳定剂在三氯乙烯中的最佳用量.     

三氯乙烯生产消费现状及市场前景

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。     

市场信息

氯酸钾由畅转滞价格下跌两成氯酸钾年初每吨2900元降到2300元。广东生产厂由一家增至八家,年产能力9000吨以上,而全省仅需4000吨左右。预计价格急剧下降后将逐渐趋向平稳,市场将徘徊在2200元左右。三氯乙烯价格上浮吉林电石厂生产的三氯乙烯出厂价由原来每吨1250元上浮为1450元,上海物资部门的供应价相应由1400元上浮为1580元。     

三氯乙烯安全环保工艺研究

介绍了三氯乙烯生产过程,通过历史事故研究分析三氯乙烯工艺安全问题,从控制、设备改造提升工艺安全性;对三氯乙烯工艺固液危废产生原因及成分进行了分析,研究出一套流化床焚烧技术,实现危废无害化处置。     

三氯乙烯生产中废弃物的处理

对三氯乙烯生产中的废弃物进行处理,1t废弃物处理后产出900 kg三氯乙烯.介绍了处理工艺.     

三氯乙烯生产中再沸器的泄漏原因及处理措施

分析三氯乙烯生产中再沸器的泄漏主要由酸腐蚀和应力腐蚀引起,提出处理措施,保证三氯乙烯装置的稳定运行。     

A colorimetric method for determining small amounts of trichloroethylene in vegetable oils

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.     

Ozone-adsorption Method of TRIC and PERC Elimination from Underground Water Corresponding to the Russian Maximum Permissible Concentration Standards

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).     

三氯乙烯国内外市场分析

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。     

Aggregation Behaviour of Acid Dyes in N,N-Dimethylformamide-Trichloroethylene Solvent Mixtures - A Quasielastic Light-scattering Study

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.     

Adsorption of Volatile Organic Compounds on Soil and Prediction of Desorption Breakthroughs

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.     

三氯乙烯气相催化法合成1,1,1,2-四氟乙烷动力学分析

研究了以三氯乙烯为主要原料,在铬镁氟化催化剂存在下,用氟化氢气相氟化制备1,1,1,2-四氟乙烷的反应机理,建立了动力学模型.并以此为依据确定了按双反应釜方案试验装置的工艺流程,当氟化氢和三氯乙烯的质量流量分别为60.86 kg/h和97.54 kg/h时,1,1,1,2-四氟乙烷的产量可达96.48 kg/h.