Preparation of 1,1,2,3-tetrachloropropene from 2,3-trichloropropane

Claim 1

A PROCESS WHICH COMPRISES FEEDING A STREAM CONSISTING ESSENTIALLY OF 1,2,3-TRICHLOROPROPANE TO LIQUID-PHASE CHLORINATOR, CHLORINATING THE FEED STREAM WITH CHLORINE GAS IN THE PRESENCE OF ACTINIC LIGHT SO THAT FROM ABOUT 20 TO ABOUT 60 PERCENT BY WEIGHT OF THE CHLORINATOR EFFLUENT REMAINS AS UNREACTED 1,2,3-TRICHLOROPROPANE, PASSING THE CHLORINATOR EFFLUENT TO A FRACTIONATING COLUMN, FRACTIONATING SAID CHLORINATOR EFFLUENT INTO A 1,2,3-TRICHLOROPROPANE, FRACTION, A 1,2,2,3-TETRACHLOROPROPANE FRACTION, A 1,1,2,2,3-PENTACHLOROPROPANE FRACTION A 1,1,1,2,3-PENTACHLOROPROPANE AND HEAVY ENDS FRACTION, AND A 1,1,2,3,3-PENTACHLOROPORPANE AND HE HEAVY ENDS FRACTION, RECYCLING THE 1,2,3-TRICHLOROPROPANE FRACTON FROM THE FRACTIONATING COLUMN TO THE CHLORINATOR, PASSING THE 1,1,2,3-TETRACHLOROPROPANE FRACTION FROM THE FRACTIONATING COLUMN TO A CAUSTIC DEHYDROCHLRINATOR, DEHYDROCHLORINATING THE 1,1,2,3TETRACHLOROPROPANE, PASSING THE DEHYDROCHLORIMATOR EFFLUENT WHICH COMPRISES MIXED TRICHLOROPROPENES TO A SECOND LIQUIDPHASE CHLORINATOR, ADDING CHLORINE IN THE PRESENCE OF ACTINIC LIGHT TO THE CARBON CARBON DOUBLE BOND OF THE TRICHLOROPROPENES CONTAINED IN THE DEHUDROCHLORINATOR EFFLUENT, PASSING THE SECOND CHLORINATOR EFFLUENT WHICH COMPRISES 1,1,1,2,3PENTACHLOROPROPANE AND 1,1,2,23-PENTACHLOROPROPANES FRACTION FROM SECOND CAUSTIC DEHYDROCHLRINATRO EFFLUENT PASSING 1,1,2,2,3-PENTACHLOROPROPANES FRACTION FROM THE FACTIONATING COLUMN TO THE SECOND CHLORINATOR EFFLUENT AND THE 1,1,1,2,3CHLORINATING THE SECOND CHLORINATOR EFFLUENT AND THE 1,1,1,2,3AND 1,1,2,2,3-PENTACHLOROPROPANES FRACTION FROM THE FRACTIONATING COLUMN PASSING THE SECOND DEHUDROCHLORINATOR EFFLUENT WHICH COMPRISES 1,1,2,3-TETRACHLOROPROPENE, TO 1,1,2,3-TETRARACHLOROPROPENE TO AN ISOMERIZER PACKED WITH CLAY GRANULES, AND ISOMERIZING 2,3,3,3-TETRACHLOROPROPANE, TO 1,1,2,3-TETRACHLOROPROPANE BY HEATING THE SECOND DEHYDROCHLORINATOR EFFLUENT IN CONTACT WITH SAID CLAY GRANULES TO A TEMPERATURE OF FROM ABOUT 150*C TO ABOUT 200*C FOR FROM ABOUT 0.4 TO ABOUT 2 HOURS AND REMOVING THE ISONERIZER EFFLUENT COMPRISING THE PRODUCT 1,1,2,3-TETRACHLORPOPROPANE.