Xn:Harmful;79-00-5Relevant articles and documents
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Kunichika,Hirase
, (1953)
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Chlorine-catalysed Pyrolysis of 1,2-Dichloroethane. Part 2.-Unimolecular Decomposition of the 1,2-Dichloroethyl Radical and its Reverse Reaction
Ashmore, Philip G.,Owen, Anthony J.,Robinson, Peter J.
, p. 677 - 694 (1982)
Fall-off curves for the unimolecular rate constant k2 of the reaction have been calculated by the Forst and RRKM methods and compared with the experimental results reported in Part 1 and by Huybrechts et al.The Forst calculations can be fitted to the Part 1 results, but then predict K2(infinite) values that lie below the experimental results of Huybrechts et al. which refer to lower temperatures and higher pressures.In contrast RRKM calculations using higher Arrhenius parameters give fall-off curves that are compatible with all available experimental data.The preferred RRKM models without allowance for the centrifugal effect have E2(infinite) ca 19.6 kcal/mol (82 kJ 1/mol) and A2(infinite) ca 1E14.0 s-1.When a reasonable centrifugal effect is allowed for the early transition state (I+/I ca 2) the preferred models have E2 ca 20.0 kcal 1/mol (84 kJ 1/mol) and A2(infinite) ca 1E14.3 s-1.Our experimental evaluations of k(p)-2 are used in conjunction with earlier experimental results and RRKM-based calculations for the reverse reaction to evaluate A-2(infinite) and E-2(infinite).
Method for synthesizing 1,2-difluoroethane and 1,1,2-trifluoroethane
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Paragraph 0022; 0024-0026; 0033-0034; 0037-0039; 0046-0047, (2020/05/30)
The invention relates to a method for synthesizing 1,2-difluoroethane and 1,1,2-trifluoroethane, belonging to the field of organic chemical synthesis. The method for synthesizing 1,2-difluoroethane and 1,1,2-trifluoroethane is characterized in that ethylene (with a molecular formula of CH2=CH2) and chlorine (with a molecular formula of Cl2) are heated under the action of a catalyst to generate a mixture of 1,2-dichloroethane and 1,1,2-trichloroethane, and the mixture and hydrogen fluoride (with a molecular formula HF) are heated under the action of a fluorination catalyst to generate 1,2-difluoroethane and 1,1,2-trifluoroethane. According to the method, raw materials are low in process and convenient to obtain; product separation and purification are simple; industrial production is easy;and industrial three-waste generation amount is low.
PROCESS FOR THE PRODUCTION OF CHLORINATED METHANES
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Paragraph 0062; 0063, (2017/04/11)
The present invention provides processes for the production of chlorinated methanes via the direct chlorination of methane. The processes include a dehydrochlorination and/or chlorination step that converts up to 100% of the higher chlorinated alkanes in a process stream from the methane chlorination reaction into more highly chlorinated alkanes. These more highly chlorinated alkanes can be easily removed from the process stream. The use of a cost effective feedstream of crude methane is thus rendered possible, without additional capital expenditure for the sophisticated separation equipment required to separate ethane and other hydrocarbon components from the methane feed.
