Pyrolysis of 1,2-dichloropropane

✍ Scribed by G. J. Martens; M. Godfroid; L. Ramoisy

• Publisher: John Wiley and Sons
• Year: 1970
• Tongue: English
• Weight: 578 KB
• Volume: 2
• Category: Article
• ISSN: 0538-8066
• DOI: 10.1002/kin.550020206

✦ Synopsis

The thermal decomposition of 1,2-dichloropropane at atmospheric pressure has been studied in the temperature range 227-59OoC, in a flow system. Above 45OoC, the reaction is homogenous and unimolecular with a rate constant:

Below 45OoC, a low activation energy, probably heterogenous process competes with the gas phase reaction.

The primary reaction products are HCl and the monochloropropene isomers; the relative amounts of each isomer depend on the temperature in the low but not in the high temperature region. The direction of the HCl elimination is discussed in terms of substituent effects at the a-and ,%carbon positions and compared with literature data on similar reactions.

Secondary products are formed principally by further pyrolysis of ally1 chloride. The first-order rate constant of this reaction is given by: k = 10*.54*0.2 exp (-37,275 f 700/RT) sec-l.