Reaction between Chlorocarbon Vapors and Sodium Carbonate

• Published in: Environmental science & technology 1999-05, Vol.33 (10), p.1691-1696
• Main Authors: Parrett, J. W, Sumner, J. P, DeVore, T. C
• Format: Article
• Language: English
• Subjects: 1,2-dichloroethane; Applied sciences; benzene; Chemical reactions; Chemistry; Exact sciences and technology; Fourier transforms; Global environmental pollution; Kinetics; Kinetics and mechanisms; Organic chemistry; Pollution; Reactivity and mechanisms; sodium carbonate; tetrachloromethane
• ISSN: 0013-936X; 1520-5851
• DOI: 10.1021/es980077b

The kinetics of the reactions between tetrachloromethane (CCl4), 1,2-dichloroethane (C2H4Cl2), or chlorobenzene (C6H5Cl) and sodium carbonate were investigated using evolved gas analysis−Fourier transform infrared spectroscopy. Sodium carbonate reacted with CCl4 between 600 and 900 K to form over 90% carbon dioxide (CO2) and less than 10% tetrachloroethene (C2Cl4). This reaction followed the three-dimensional diffusion mechanism and had an activation energy of 105 ± 10 kJ/ mol and a steric factor of 5000 ± 3000 min-1. The reaction between C2H4Cl2 and sodium carbonate produced CO2, ethanal (C2H4O), water (H2O), vinyl chloride (C2H3Cl), ethene (C2H4), and ethyne (C2H2) between 600 and 900 K from at least two different pathways. The product temperature profiles indicated that CO2, C2H4O, and C2H3Cl were formed initially and that approximately 10% of the product is C2H4 at 900 K. The reaction kinetics followed the Ginstling−Brounshtein diffusion mechanism and had an activation energy of 100 ± 10 kJ/ mol and a steric factor of approximately 104 min-1. Benzene was produced from the reaction between chlorobenzene and sodium carbonate at temperatures above 800 K. This reaction followed the three-dimensional diffusion mechanism and had an activation energy of 80 ± 10 kJ/mol and a steric factor of approximately 500 min-1.