Process for making 1,3,3,3-tetrafluoropropene
First Claim
1. A process for making CF3CH═
- CHF comprising the steps of;
(a) converting 1,2-dichloroethylene to the compound CCl3CHClCHCl2 by an addition reaction with CCl4;
(b) converting CCl3CHClCHCl2 to the compound CCl2═
CHCHCl2 by a dechlorination reaction;
(c) fluorinating the product of step (b) to form the compound CF3CH2CHClF; and
(d) dehydrochlorinating the product of step (c) to form the compound CF3CH═
CHF.
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Abstract
The present invention describes a process for making CF3CH═CHF (HFO-1234ze). The process involves the addition of carbon tetrachloride (CCl4) to 1,2-dichloroethylene to form CCl3CHClCHCl2. The compound CCl3CHClCHCl2 thus can then either be treated with HF to produce CF3CHClCHClF as the main product, or it can be converted to CCl2═CHCHCl2 (1230za) by dechlorination. CCl2═CHCHCl2 can be treated with HF such that the main product obtained is CF3CHClCHClF. CF3CH═CHCl may be produced as a by-product, but upon treatment with HF, it affords the compound CF3CHClCHClF. The desired compound, CF3CH═CHF (HFO-1234ze), is obtained as a trans/cis mixture by dehydrochlorination of CF3CH2CHClF or by dechlorination of CF3CHClCHClF.
14 Citations
35 Claims
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1. A process for making CF3CH═
- CHF comprising the steps of;
(a) converting 1,2-dichloroethylene to the compound CCl3CHClCHCl2 by an addition reaction with CCl4; (b) converting CCl3CHClCHCl2 to the compound CCl2═
CHCHCl2 by a dechlorination reaction;(c) fluorinating the product of step (b) to form the compound CF3CH2CHClF; and (d) dehydrochlorinating the product of step (c) to form the compound CF3CH═
CHF. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 34)
- CHF comprising the steps of;
-
22. A process for making CF3CH═
- CHF comprising the steps of;
(a) reacting carbon tetrachloride with 1,2-dichloroethylene to form the compound CCl3CHClCHCl2; (b) fluorinating the compound CCl3CHClCHCl2 with HF to produce the compound CF3CHClCHClF; and (c) dechlorinating CF3CHClCHClF to produce the compound CF3CH═
CHF. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 35)
- CHF comprising the steps of;
Specification