PROCESS
First Claim
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1. A process for preparing 2,3,3,3-tetrafluoropropene (1234yf), the process comprising:
- (a) converting 1,1,1-trifluoro-2,3-dichloropropane (243db) to 3,3,3-trifluoro-2-chloro-prop-1-ene (CF3CCI═
CH2, 1233xf) in the presence of a first catalyst in a first reactor;
(b) contacting 1233xf with a fluorinating agent in the presence of a second catalyst in a second reactor to produce a compound of formula CF3CFXCH3, wherein X═
Cl or F; and
(c) dehydrohalogenating the compound of formula CF3CFXCH3 to produce 1234yf.
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Abstract
The present invention provides a process for its preparation comprising (a) converting 1,1,1-trifluoro-2,3-dichloropropane (243db) to 3,3,3-trifluoro-2-chloro-prop-1-ene (CF3CCI═CH2) in the presence of a first catalyst in a first reactor, (b) contacting CF3CCI═CH2 with a fluorinating agent in the presence of a second catalyst in a second reactor to produce a compound of formula CF3CFXCH3, wherein X═Cl or F, and (c) dehydrohalogenating the compound of formula CF3CFXCH3 to produce 2,3,3,3-tetrafluoropropene (1234yf).
42 Citations
43 Claims
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1. A process for preparing 2,3,3,3-tetrafluoropropene (1234yf), the process comprising:
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(a) converting 1,1,1-trifluoro-2,3-dichloropropane (243db) to 3,3,3-trifluoro-2-chloro-prop-1-ene (CF3CCI═
CH2, 1233xf) in the presence of a first catalyst in a first reactor;(b) contacting 1233xf with a fluorinating agent in the presence of a second catalyst in a second reactor to produce a compound of formula CF3CFXCH3, wherein X═
Cl or F; and(c) dehydrohalogenating the compound of formula CF3CFXCH3 to produce 1234yf. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 27, 28)
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25-26. -26. (canceled)
- 29. A process of claim comprising the step (iii) of contacting 3,3,3-trifluoropropene (1243zf) with a compound of formula AB to produce a compound of formula CF3CHACH2B, wherein A and B represent, independently, H, F, Cl, Br or I, provided that A and B are not both H or F, preferably wherein AB is chlorine and CF3CHACH2B is 243db.
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31. (canceled)
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32. A process for preparing 1234yf, the process comprising:
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(i) telomerising ethylene and carbon tetrachloride (CCI4) to produce 1,1,1,3-tetrachloropropane (250fb); converting 250fb to 3,3,3-trifluoropropene (1243zf); (iii) contacting 1243zf with a compound of formula AB to produce a compound of formula CF3CHACH2B, wherein A and B represent, independently, H, F, Cl, Br or I, provided that A and B are not both H or F; (iv) converting the compound of formula CF3CHACH2B to 1233xf in the presence of a first catalyst in a first reactor; (v) contacting 1233xf with a fluorination agent in the presence of a second catalyst in a second reactor to produce a compound of formula CF3CFXCH3, wherein X═
Cl or F; and(vi) dehydrohalogenating the compound of formula CF3CFXCH3 to produce 1234yf.
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33. A process for preparing 3,3,3-trifluoropropene (1243zf), the process comprising contacting a compound of formula CX3CH2CH2X or CX3CH═
- CH2, with hydrogen fluoride (HF) in the presence of a zinc/chromia catalyst, wherein each X independently is F, Cl, Br or I, provided that in the compound of formula CX3CH═
CH2, at least one X is not F. - View Dependent Claims (34, 35, 36, 37, 38, 39, 40, 41, 42)
- CH2, with hydrogen fluoride (HF) in the presence of a zinc/chromia catalyst, wherein each X independently is F, Cl, Br or I, provided that in the compound of formula CX3CH═
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43-44. -44. (canceled)
Specification