Methods for recovering 1,1,1,2,3-pentachloropropane
AssigneeOccidental Chemical Corporation
InventorsJohn Lee Dawkins, Darrell Gene Hollis, Rodney L. Klausmeyer, Keith S. Kramer, Michael Andrew Garmon
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Abstract
Processes for isolating 1,1,1,2,3-pentachloropropane from a crude product stream containing the 1,1,1,2,3-pentachloropropane and ferric chloride. The processes may include deep distillation of the crude, treatment of the crude with a reagent that deactivates the ferric chloride followed by distillation on the deactivated crude stream, aqueous washing of the crude product stream to remove ferric chloride followed by distillation on the deactivated crude stream. Other embodiments simultaneously prepare 1,1,2,3-tetrachloroprene and 1,1,1,2,3-pentachloroprane.
Claims28
A process for isolating 1,1,1,2,3-pentachloropropane from a crude product stream containing the 1,1,1,2,3-pentachloropropane, the process comprising:
- (a) providing a crude product stream containing 1,1,1,2,3-pentachloropropane, where the crude product stream further includes ferric chloride;
- (b) adding a reagent to the crude product stream to deactivate the ferric chloride;
- wherein the reagent is selected from the group consisting of tributylphosphate and hydrocarbon oil;
- wherein the amount of tributylphosphate added to the crude product stream is from about 0.7 to about 5 moles of tributylphosphate per mole of ferric chloride within the crude product stream;
- and wherein at least 1 mole of oil per mole of ferric chloride is added to the crude product stream.
A process for isolating 1,1,1,2,3-pentachloropropane from a crude product stream containing the 1,1,1,2,3-pentachloropropane, the process comprising:
- (a.) providing a crude product stream containing 1,1,1,2,3-pentachloropropane, where the crude product stream includes ferric chloride;
- (b.) combining the crude product stream with water to form a mixture;
- (c.) allowing the mixture to phase separate and thereby form an aqueous phase and an organic phase, where the aqueous phase includes ferric chloride and the organic phase is substantially free of ferric chloride;
- (d.) separating the aqueous phase from the organic phase;
- and
- (e.) further processing the organic phase to isolate 1,1,1,2,3-pentachloropropane.
A process for simultaneously producing purified streams of 1,1,2,3-tetrachloropropene and 1,1,1,2,3-pentachloropropane, the process comprising:
- a. providing a crude product stream containing 1,1,1,2,3-pentachloropropane, where the crude product stream includes ferric chloride;
- and
- b. subjecting the crude product stream to distillation at a pressure sufficient to convert a portion of the 1,1,1,2,3-pentachloropropane within the crude to 1,1,2,3-tetrachloropropene while simultaneously forming a volatiles fraction including the 1,1,1,2,3-pentachloropropane and 1,1,2,3-tetrachloropropene, where the volatiles fraction is substantially free of ferric chloride.
A process for simultaneously producing purified streams of 1,1,2,3-tetrachloropropene and 1,1,1,2,3-pentachloropropane, the process comprising:
- a. providing a crude product stream containing 1,1,1,2,3-pentachloropropane, where the crude product stream includes ferric chloride;
- b. subjecting the crude product stream to reactive distillation within a distillation column under conditions sufficient to form a gradient within the column, where the gradient includes a maximum concentration of 1,1,1,2,3-pentachloropropane at the bottom of the gradient and maximum of 1,1,2,3-tetrachloropropene at the top of the gradient;
- and
- c. removing the 1,1,1,2,3-pentachloropropane from the distillation column at a location within the gradient proximate to the maximum concentration of 1,1,1,2,3-pentachloropropane within the gradient.
Dependencies are inferred from the claim text.