Available methods for the conversion of dichloropropane to allene and methylacetylene

. The nature of the formation allene and methylacetylene during dehydrochlorination 1,2-dichloropropane intermediate products (1-chloropropene-1, 2-chloropropene-1, 2-chloropropane, 3-chloropropene-1) on γ-Al2O3, CaX expanded clay made it possible to establish that main source is - 1-chloropropene-1, γ -Al2O3, appears mainly from 2-chloroprene. highest value allene: ratio was obtained 1,2-dichloro propane 2-chloroprene (6.90 7.30; 7.70 8.19, respectively), while alumina this indicator much lower does not exceed 0.2, total content allene-methylacetylene fraction in presence latter also lowest. It noteworthy that, regardless feedstock under study, course reaction aluminum oxide characterized by an insignificant allene, which probably a consequence all isomerization occurring catalyst surface. totality these data enable DCP conversion mechanism carried out different ways regarding acid-base active sites catalytic systems: γ-Al2O3 with participation Lewis acid sites, Brønsted sites.