High purity E-1-chloro-3,3,3-trifluoropropene and methods of making the same
View Patent ↗The present invention discloses high purity E-1-chloro-3,3,3-trifluoropropene (1233zd(E)) and methods to produce the same. More specifically, the present invention discloses the methods of making 1233zd(E) essentially free of toxic impurities (e.g. 2-chloro-3,3,3-trifluoropropene (1233xf), chlorotetrafluoro-propene (1224), and 3,3,3-trifluoropropyne). The present invention further provides methods for making high purity 1233zd(E) with concentration of 1233xf and 1224 at or below 200 parts per million (ppm) and 3,3,3-trifluoropropyne impurities at or below 20 ppm. Formation of 1233xf impurity can be avoided if pure 1,1,1,3,3-pentachloropropane is used as a starting material. It was also found that formation of 1233xf is avoided if a liquid phase manufacturing process is used.
1. In a method for producing E-1-chloro-3,3,3-trifluoropropene (1233zd(E)) comprising the gas phase fluorination of a feed stream selected from the group consisting of 1,1,1,3,3-pentachloropropane (240fa), 1,1,3,3-tetrachloropropene, 1,3,3,3-tetrachloropropene, and mixtures thereof, with hydrogen fluoride;
the improvement comprising:
using an impure feed stream that contains 1,1,1,2,3-pentachloropropane (240db) in an amount up to about 0.2% by weight, and
wherein the 1233zd(E) product is produced at a purity of about 99.6 weight percent, and
wherein the product contains the toxic impurities 2-chloro-3,3,3-trifluoropropene (1233xf) and/or chlorotetrafluoropropene (1224), at a concentration of no more than 200 parts per million, and the explosive impurity 3,3,3-trifluoropropyne, at a concentration of no more than 50 parts per million.
2. The process of claim 1 , wherein the impure feed stream comprises up to about 0.1% by weight of 1,1,1,2,3-pentachloropropane (240db).
3. The process of claim 1 , wherein the impure feed stream comprises up to about 0.08% by weight of 1,1,1,2,3-pentachloropropane (240db).
4. In a method for producing E-1-chloro-3,3,3-trifluoropropene (1233zd(E)) comprising the gas phase fluorination of a feed stream selected from the group consisting of 1,1,1,3,3-pentachloropropane (240fa), 1,1,3,3-tetrachloropropene, 1,3,3,3-tetrachloropropene, and mixtures thereof, with hydrogen fluoride;
the improvement comprising:
using an impure feed stream that contains 1,1,2,3-tetrachloropropene in an amount up to about 0.2% by weight, and
wherein the 1233zd(E) product is produced at a purity of about 99.6 weight percent, and
wherein the 1233zd(E) product contains the toxic impurities 2-chloro-3,3,3-trifluoropropene (1233xf) and/or chlorotetrafluoropropene (1224), at a concentration of no more than 200 parts per million, and the explosive impurity 3,3,3-trifluoropropyne, at a concentration of no more than 50 parts per million.
5. The process of claim 4 , wherein the impure feed stream comprises up to about 0.1% by weight of 1,1,2,3-tetrachloropropene.
6. The process of claim 5 , wherein the impure feed stream comprises up to about 0.08% by weight of 1,1,2,3-tetrachloropropene.
7. In a method for producing E-1-chloro-3,3,3-trifluoropropene (1233zd(E)) comprising the gas phase fluorination of a feed stream selected from the group consisting of 1,1,1,3,3-pentachloropropane (240fa), 1,1,3,3-tetrachloropropene, 1,3,3,3-tetrachloropropene, and mixtures thereof, with hydrogen fluoride;
the improvement comprising:
using an impure feed stream that contains 2,3,3,3-tetrachloropropene in an amount up to about 0.2% by weight, and
wherein the 1233zd(E) product is produced at a purity of about 99.6 weight percent, and
wherein the 1233zd(E) product contains the toxic impurities 2-chloro-3,3,3-trifluoropropene (1233xf) and/or chlorotetrafluoropropene (1224), at a concentration of no more than 200 parts per million, and the explosive impurity 3,3,3-trifluoropropyne, at a concentration of no more than 50 parts per million.
8. The process of claim 7 , wherein the impure feed stream comprises up to about 0.1% by weight of 2,3,3,3-tetrachloropropene.
9. The process of claim 7 , wherein the impure feed stream comprises up to about 0.08% by weight of 2,3,3,3-tetrachloropropene.