Process for fluoroalkenes
AssigneeHoneywell International Inc.
InventorsHaridasan K. Nair, Andrew J. Poss
Life of this patent
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Abstract
Disclosed is a process for producing fluoroalkene of the formula Rf—CH═CH2 from a fluorohaloalkene having the formula Rf—C(R1)═C(R2)H, wherein Rf is fluorine or a substituted or unsubstituted C1–C20 straight or branched-chain fluorinated alkyl and R1 and R2 are independently H, Cl, Br, or I, provided that at least one of R1 or R2 is Cl, Br, or I by reacting the fluorohaloalkene with a reducing agent, preferably a formate salt in the presence of a catalyst.
Claims37
A method of reducing environmentally undesirable emissions from a process that produces as a byproduct a chlorinated compound of formula (I)
- Rf—C(R1)═C(R2)H (I)
- wherein
- Rf is fluorine or substituted or unsubstituted C1–C20 straight or branched-chain fluorinated alkyl;
- and
- R1 and R2 are independently H, Cl, Br, or I, provided that at least one of R1 or R2 is Cl, the method comprising the steps of:
- providing a waste by-product containing at least one compound of formula (I);
- exposing said waste by-product to reaction conditions effective to reduce at least a substantial portion of the compound of formula (I) contained in said waste by-product to at least one fluoroalkene having a lower degree of chlorination than said compound of formula (I) by contacting said waste by-product with at least one formate salt in the presence of a catalyst, said exposing step producing a reaction product stream comprising compound of formula (I) and said at least one fluoroalkene;
- separating at least a portion of said at least one fluoroalkene produced in said exposing step from said reaction product stream to produce a stream relatively rich in said compound of formula (I);
- and
- subjecting said stream relatively rich in the compound of formula (I) to said exposing step.
A method for producing a fluoroalkene of the formula Rf—CH═CH2 from a fluorohaloalkene of formula (I)
- Rf—C(R1)═C(R2)H (I)
- wherein
- Rf is fluorine or a substituted or unsubstituted C1–C20 straight or branched-chain fluorinated alkyl;
- and
- R1 and R2 are independently H, Cl, Br, or I, provided that at least one of R1 or R2 is Cl, Br, or I, comprising the steps of:
- contacting the fluorohaloalkene with at least one formate salt in the presence of a catalyst.
A method for continuous production of 3,3,3-trifluoropropene comprising:
- providing a fluorochloroalkene selected from the group consisting of 1,2-dichloro-3,3,3-trifluorpropene, 1-chloro-3,3,3-trifluorpropene, and mixtures thereof;
- contacting the fluorochloroalkene with at least one formate salt and a catalyst;
- separating 3,3,3-trifluoropropene from any unreacted fluorochloroalkene;
- and
- recycling the unreacted fluorochloroalkene to the reactor.
Dependencies are inferred from the claim text.