METHOD TO IMPROVE 1,1,3-TRICHLOROPROPENE AND/OR 3,3,3-TRICHLOROPROPENE SELECTIVITY DURING THE DEHYDROCHLORINATION OF 1,1,1,3-TETRACHLOROPROPANE

摘要

This invention relates to a method to improve 1,1,3- trichloropropene (HCC 1240za) and/or 3,3,3-trichloropropene (HCC 1240zf) selectivity in the dehydrochlormation of 1,1,1,3-tetrachloropropane (HCC 250fb). In normal practice FeCl3 is used as the catalyst for the dehydrochlormation of HCC 250fb to produce 1,1,3- trichloropropene and/or 3,3,3-trichloropropene. The present invention demonstrates that when using FeCl3 as the catalyst for 1,1,1,3-tetrachloropropane dehydrochlormation the reaction product contains significant amounts of high boiling compounds such as pentachlorocyclohexene and/or hexachlorocyclohexane species. The addition of one or more UV stabilizer and/or anti oxidant compounds or mixtures thereof into the dehydrochlormation reaction system inhibits the formation of these high boiling compounds and improves selectivity to the desired product.