Preparation of 2,3,3,3-tetrafluoropropene and intermediates thereof
AssigneeSRF Limited
InventorsSarathy Iyengar, Sridhar Jeyaraman, Karthic Natarajan, Nathan Rajamani, Rahul Saxena, Anurag Jain
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Abstract
The present invention provides a process for preparation of 2,3,3,3-tetrafluoropropene and intermediates thereof. Owing to its low global warming potential and zero ozone depleting potential, it is been proposed as a replacement for existing chlorofluorocarbons and hydrofluorocarbons as refrigerant.
Claims13
A process for preparation of 2,3,3,3-tetrafluoropropene, comprising the steps of:
- a) reacting carbon tetrachloride with ethylene in presence of a metallic catalyst and an organic ligand to obtain a reaction mixture 1, comprising 1,1,1,3-tetrachloropropane;
- b) de-hydrohalogenating the reaction mixture 1 to obtain a reaction mixture 2 comprising 1,1,3-trichloroprop-1-ene and 3,3,3-trichloroprop-1-ene;
- c) fluorinating the reaction mixture 2 using a gaseous composition of fluorine and nitrogen in the presence of anhydrous hydrogen fluoride to obtain a reaction mixture 3, comprising trichlorodifluoropropanes of formula 1, X2CH2CHFCCl2X1, wherein X1 and X2 represents chlorine or fluorine;
- provided that X1 is not same as X2;
- and
- d) simultaneous fluorination and de-hydrohalogenation of the reaction mixture 3 to obtain 2,3,3,3-tetrafluoropropene.
A process for preparation of 2,3,3,3-tetrafluoropropene, comprising the steps of:
- a) de-hydrohalogenating 1,1,1,3-tetrachloropropane to obtain a reaction mixture 2, comprising 1,1,3-trichloroprop-1-ene and 3,3,3-trichloroprop-1-ene;
- b) fluorinating the reaction mixture 2 using a gaseous composition of fluorine and nitrogen in the presence of anhydrous hydrogen fluoride to obtain a reaction mixture 3, comprising trichlorodifluoropropanes of formula 1, X2CH2CHFCCl2X1, wherein X1 and X2 represents chlorine or fluorine;
- provided that X1 is not same as X2;
- and
- c) simultaneous fluorination and de-hydrohalogenation of the reaction mixture 3 to obtain 2,3,3,3-tetrafluoropropene.
A process for preparation of 2,3,3,3-tetrafluoropropene, comprising the step of:
- a) fluorinating a reaction mixture comprising 1,1,3-trichloroprop-1-ene and 3,3,3-trichloroprop-1-ene using a gaseous corn position of fluorine and nitrogen in the presence of anhydrous hydrogen fluoride, to obtain a reaction mixture 3, comprising trichlorodifluoropropanes of formula 1, X2CH2CHFCCl2X1, wherein X1 and X2 represents chlorine or fluorine;
- provided that X1 is not same as X2;
- and
- b) simultaneous fluorination and de-hydrohalogenation of the reaction mixture 3 to obtain 2,3,3,3-tetrafluoropropene.
A process for preparation of 2,3,3,3-tetrafluoropropene, comprising a step of simultaneously fluorination and de-hydrohalogenation of a mixture comprising trichlorodifluoropropanes of formula 1, X2CH2CHFCCl2X1, wherein X1 and X2 represents chlorine or fluorine;
- provided that X1 is not same as X2;
- to obtain 2,3,3,3-tetrafluoropropene.
A process for preparation of trichlorodifluoropropanes of formula 1, X2CH2CHFCCl2X1, wherein X1 and X2 represents chlorine or fluorine;
- provided that X1 is not same as X2, comprising the steps of:
- a) reacting carbon tetrachloride with ethylene in presence of a metallic catalyst to obtain a reaction mixture 1, comprising 1,1,1,3-tetrachloropropane;
- b) de-hydrohalogenating the reaction mixture 1 to obtain a reaction mixture 2, comprising 1,1,3-trichloroprop-1-ene and 3,3,3-trichloroprop-1-ene;
- c) fluorinating the reaction mixture 2 using a gaseous composition of fluorine and nitrogen in the presence of anhydrous hydrogen fluoride, to obtain a compound of formula 1.
A process for preparation of trichlorodifluoropropanes of formula 1, X2CH2CHFCCl2X1, wherein X1 and X2 represents chlorine or fluorine;
- provided that X1 is not same as X2, comprising the steps of:
- a) de-hydrohalogenating 1,1,1,3-tetrachloropropane to obtain a reaction mixture 2, comprising 1,1,3-trichloroprop-1-ene and 3,3,3-trichloroprop-1-ene;
- b) fluorinating the reaction mixture 2 using a gaseous composition of fluorine and nitrogen in the presence of anhydrous hydrogen fluoride, to obtain a compound of formula 1.
A process for preparation of trichlorodifluoropropanes of formula 1, X2CH2CHFCCl2X1, wherein X1 and X2 represents chlorine or fluorine;
- provided that X1 is not same as X2, comprising the steps of, fluorinating a mixture comprising 1,1,3-trichloroprop-1-ene and 3,3,3-trichloroprop-1-ene using a gaseous composition of fluorine and nitrogen in the presence of anhydrous hydrogen fluoride to obtain a compound of formula 1.
Dependencies are inferred from the claim text.