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US 12,735,373 B2Granted
Method for treating a heavy byproduct stream from chlorinated propane production
AssigneeBlue Cube IP LLC
InventorJohn D. Myers
Life of this patent
Estimating the term…
Abstract
A process for treating a heavy byproduct stream from an initial chlorinated propane forming reaction in order to increase the final output of chlorinated propene and remove metal catalyst. In particular, the process disclosed herein provides for a primary stream in which chlorinated propanes are converted to chlorinated propenes in a catalytic dehydrochlorination reaction, while also treating a separate byproduct stream with a caustic to precipitate metal from a metal catalyst and convert any remaining chlorinated propanes to chlorinated propenes in order to increase final chlorinated propene output.
Claims32
A process for producing chlorinated propenes comprising
- contacting, in a first reaction, a chlorinated methane, a metal containing catalyst, a promoter, and an alkene or chlorinated alkene together to form a crude chloropropane product comprising a chloropropane and heavy byproducts with boiling points higher than the chloropropane;
- separating, in a crude chloropropane product separation, the crude chloropropane product into a light fraction and a heavy fraction, the light fraction comprising at least half of the chloropropane from the crude chloropropane, and a heavy fraction comprising the remaining chloropropane, the heavy byproducts, the metal containing catalyst, the promoter, and any complexes formed from the promoter and metal containing catalyst;
- and
- contacting at least a portion of the heavy fraction with an aqueous base in a second reaction thereby forming an aqueous phase comprising metal precipitated from the metal containing catalyst and an organic phase comprising a first crude chloropropene product comprising chloropropene formed via a dehydrochlorination reaction,
- separating the aqueous phase from the organic phase;
- and
- contacting, in a third and separate dehydrochlorination reaction, the light fraction with a Lewis acid dehydrochlorination catalyst thereby forming a second crude chloropropene product.
4 more elements
A process for treating a chloropropane stream comprising
- reacting, in a first reaction, telogen, a metal containing catalyst, a promoter and a taxogen together to form a crude chloropropane product comprising a chloropropane and heavy byproducts;
- splitting the crude chloropropane product into a light stream and a heavy stream, the light stream comprising the majority of the chloropropane, and the heavy stream comprising the remaining chloropropane, the heavy byproducts, the metal containing catalyst, the promoter, and any complexes formed from the promoter and metal containing catalyst;
- contacting the heavy stream with an aqueous base in a second reaction to effect precipitation of the metal from the metal containing catalyst into an aqueous phase, and the formation of a first crude chloropropene product comprising chloropropene from a dehydrochlorination reaction;
- separating the aqueous phase from the organic phase;
- and
- contacting the light fraction with a Lewis acid catalyst in a third reaction, thereby forming a second crude chloropropene product.
3 more elements
A system comprising:
- a first reactor in which a mixture of a chlorinated methane, a metal containing catalyst, a promoter, and an alkene or vinyl chloride are reacted to form a crude chloropropane product comprising a chloropropane;
- a separator in which the crude chloropropane product is separated into a light fraction and a heavy fraction, the light fraction comprising at least half of the chloropropane from the crude chloropropane, the heavy fraction comprising the remaining chloropropane and the metal containing catalyst, the promoter, and any complexes of the promoter and metal containing catalyst formed;
- a second reactor in which the heavy fraction is contacted with an aqueous base thereby forming an aqueous phase comprising metal compounds precipitated from the metal containing catalyst and an organic phase comprising a first crude chloropropene product comprising chloropropene, the first crude chloropropene product formed via a dehyhdrochlorination reaction;
- and
- a third reactor in which the light fraction is contacted with a Lewis acid catalyst in a third reaction, thereby forming a second crude chloropropene product.
2 more elements
Dependencies are inferred from the claim text.