Patent ID: 8921621
Filing Date: 2014-12-30
Classification: C07C

Abstract:
1. A process for the production of 1-chloro-3,3,3-trifluoropropene (HCFC-1233zd) comprising the steps of: (a) reacting HCC-240 and HF in a high pressure liquid phase reactor wherein the reactor pressure range is from 400 psig to 600 psig to generate an effluent reaction stream comprising HCFC-1233zd, intermediates and byproducts of HCFC-1233zd, HCl and unreacted HCC-240 and HF; and (b) at least partially condensing the effluent stream from reaction step (a) to form a condensate comprising HCFC-1233zd; (c) separating the condensate from step (b) using phase separation, to form an HF-rich layer and an organic rich layer; (d) recycling the HF-rich layer from step (c) to the reactor in step (a); (e) feeding the organic rich layer from step (c) to an aqueous HCl recovery system to remove and recover the HCl as a solution in water; (f) distilling the HCl-free organic components from step (e) to form an overhead stream and to remove any recyclable intermediates to HCFC-1233zd; (g) recycle the intermediates to HCFC-1233zd from step (f) by feeding them back to the reactor of step (a); (h) feeding the overhead stream from step (f) to a caustic scrubber to remove any remaining acidity and drying the scrubbed stream with a drying agent; and (i) distilling the acid-free, dry stream from step (h) to produce high purity HCFC-1233zd having a GC purity of 99.5% or greater.