Low temperature production of 2-chloro-3,3,3-trifluoropropene
View Patent ↗Disclosed is a method for the production of 1233xf comprising the continuous low temperature liquid phase reaction of 1,1,1,2,3-pentachloropropane and anhydrous HF, without the use of a catalyst, wherein the reaction takes place in one or more reaction vessels, each one in succession converting a portion of the original reactants fed to the lead reaction vessel and wherein the reactions are run in a continuous fashion.
1. An integrated system for producing 1233xf comprising:
(a) one or more feed streams cumulatively comprising hydrogen fluoride and 1,1,1,2,3-pentachloropropane;
(b) a liquid phase reactor system consisting of a series of two or more reactors each fed by its predecessor, each combined with attached stripping column supplied with low-temperature cooling, maintained at a first temperature of about 65° C. to about 175° C., wherein said liquid phase reactor series is fluidly connected to said one or more feed streams;
(c) a stripping system comprising a stripping column, a reflux stream fluidly connected to said stripping column, and a combined first crude product stream fluidly connected to said stripping column, wherein said reflux stream is fluidly connected to said lead liquid phase reactor;
(d) a hydrogen chloride removal system comprising a first distillation column, a hydrogen chloride by-product stream fluidly connected to said first distillation column, and a second crude product stream fluidly connected to said first distillation column, wherein said first distillation column is fluidly connected to said stripping column;
(e) a hydrogen fluoride recovery system comprising a sulfuric acid absorption and recycle system or a phase separation vessel, a second recycle stream comprising hydrogen fluoride fluidly connected to said sulfuric acid absorption and recycle system or a phase separation vessel, a third product stream comprising 2-chloro-3,3,3-trifluoropropene fluidly connected to said sulfuric acid absorption and recycle system or a phase separation vessel, wherein said sulfuric acid absorption and recycle system or a phase separation vessel is fluidly connected to said second crude product stream; and
(f) a 2-chloro-3,3,3-trifluoropropene purification system comprising a second distillation column fluidly connected to said third product stream; a final product stream comprising 2-chloro-3,3,3-trifluoropropene fluidly connected to said second distillation column; a second by-product stream fluidly connected to said distillation column.
2. The system of claim 1 , wherein the reaction temperature range is from 85° C. to 155° C.
3. The system of claim 1 , wherein the reaction temperature range is from 95° C. to 150° C.