Methods for the dehydrochlorination of 1,1,1,3-tetrachloropropane to 1,1,3-trichloropropene
This invention relates to a method to improve 1,1,3-trichloropropene selectivity in HCC-250fb (1,1,1,3-tetrachloropropane) dehydrochlorination. In normal practice, FeCl 3 is used as the catalyst for the dehydrochlorination of HCC-250fb to produce 1,1,3-trichloropropene. In this invention as source of water is added into the reaction system to inhibit the formation of high boiling compounds such as pentachlorocyclohexene and/or hexachlorocyclohexane. Once source of water is H 2 O itself. Another source of water is one or more hydrated metal halides.
1. A process for the catalytic dehydrochlorination of HCC-250fb to produce 1,1,3-trichloropropene using a catalyst or catalyst mixture comprising iron halides, wherein a source of water is added into the system to inhibit the formation of high boiling compounds including pentachlorocyclohexene and/or hexachlorocyclohexane.
2. The process of claim 1 , wherein the source of water comprises H 2 O.
3. The process of claim 2 , wherein the iron halide compounds comprise chloride compounds.
4. The process of claim 3 , wherein the iron chloride compound comprises FeCl 3 .
5. The process of claim 3 , wherein the iron chloride compound comprises FeCl 2 .
6. The process of claim 2 , wherein the weight ratio of H 2 O to HCC-250fb added into the system can be ranged from above 0% by weight to 5% by weight.
7. The process of claim 2 , wherein the weight ratio of H 2 O to HCC-250fb is from about 0.01% to about 1%.
8. The process of claim 1 , wherein the source of water comprises one or more hydrated metal halides.
9. The process of claim 8 , wherein the hydrated metal halide is selected from the group consisting of BaCl 2 .2H 2 O, CrCl 3 .6H 2 O, CuCl 2 .2H 2 O, FeCl 2 .4H 2 O, FeCl 3 .6H 2 O, MnCl 2 .6H 2 O, NiCl 2 .6H 2 O, SnCl 2 .2H 2 O, CoBr 2 .6H 2 O, VI 3 .6H 2 O and mixtures thereof.
10. The process of claim 8 , wherein the hydrated metal halide comprises BaCl 2 .2H 2 O and the iron halide comprises FeCl 3 .
11. The process of claim 10 , wherein the weight ratio of FeCl 3 to HCC-250fb is from above 0 to 10,000 ppm and the weight ratio of BaCl 2 .2H 2 O to HCC-250fb is from above 0 to 10%.
12. The process of claim 10 , wherein the weight ratio of FeCl 3 to HCC-250fb is from 100 to 2000 ppm and the weight ratio of BaCl 2 .2H 2 O to HCC-250fb is from 0.1% to 5%.
13. The process of claim 1 , wherein the dehydrochlorination reaction is carried out under conditions to attain a starting material HCC-250fb conversion of at least about 20 mol % or higher.
14. The process of claim 1 , wherein the dehydrochlorination reaction is carried out under conditions to attain a starting material HCC-250fb conversion of at least about 40 mol % or higher.
15. The process of claim 1 , wherein the dehydrochlorination reaction is carried out under conditions to attain a starting material HCC-250fb conversion of at least about 50 mol % or higher.
16. A process for the dehydrochlorination of HCC-250fb to produce 1,1,3-trichloropropene using one or more iron halide compounds as the catalyst, wherein a source of water is added into the system to improve 1,1,3-trichloropropene selectivity.
17. The process of claim 16 , wherein the source of water comprises H 2 O.
18. The process of claim 16 , wherein the source of water comprises one or more hydrated metal halides.
19. The process of claim 16 , wherein the selectivity to the formation of 1,1,3-trichloropropene is at least about 70 mol % or higher.
20. The process of claim 16 , wherein the selectivity to the formation of 1,1,3-trichloropropene is at least about 95 mol % or higher.