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Process to manufacture 2-chloro-1,1,1,2-tetrafluoropropane (HCFC-244bb)

A technology of tetrafluoropropane and tetrafluoropropene, applied in the field of preparing HCFC-244bb, can solve the problems of promoting the formation of by-products, reducing the conversion rate, and difficult to control

Inactive Publication Date: 2010-03-10
HONEYWELL INT INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since there is no formation of HCl in the reaction from HCFO-1233xf to HCFC-244bb, there is less mixing in the reactor, which may reduce conversion and promote by-product formation
In addition, the reactor is more difficult to control because there is no HCl to create high pressure or to help carry out the produced HCFC-244bb

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Demonstrate the continuous liquid of 2-chloro-3,3,3-trifluoropropene (HCFO-1233xf)+HF→2-chloro-1,1,1,2-tetrafluoropropane (HCFC-244bb) when HCl is fed continuously phase fluorination reaction. The fluorination catalyst in this experiment was SbCl 5 .

[0045] Equipped with a catalyst stripper, 2 inch ID (inside diameter) packed column and used to return entrained catalyst, some unreacted HF and some unreacted HCFO-1233xf to the reactor when the system is operating in continuous reaction mode Condenser Teflon TM The lined liquid phase reactor (Teflon is a trademark of E.I. duPont deNemours & Co) contained 6500 grams of SbCl 5 . The reactor was 2.75 inches ID x 36 inches L (length) and was not equipped with a mixer / stirrer. The reactor was heated to about 85°C-87°C. Then by adding 1500 g HF followed by 1500 g Cl 2 to activate the catalyst. HCl produced by the fluorination of the catalyst raises the pressure of the reaction system to about 100 psig, where it is con...

Embodiment 2

[0047] The stream from the top of the catalyst stripper in Example 1 mainly comprising HCFC-244bb, unreacted HF and HCl is fed to a conventional distillation column where the HCl is recovered and / or recycled back to the liquid phase reactor To aid in mixing, maintaining pressure and bringing out product.

Embodiment 3

[0049] A 2000 gallon industrial scale reactor was charged with antimony pentachloride catalyst. HCFO-1233xf and HF are continuously fed into the reaction vessel. HF is fed in excess. Hydrogen chloride was added as an additional component to aid in mixing and to aid in the evaporation of the product. HCFC-244bb, HF and hydrogen chloride leave the vessel and are recovered.

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PUM

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Abstract

The invention provides an improved process to manufacture 2-chloro-1,1,1,2-tetrafluoropropane (HCFC-244bb) by reacting 2-chloro-3,3,3,-trifluoropropene (HCFO-1233xf) with hydrogen fluoride, in a liquid phase reaction in the presence of hydrogen chloride and a liquid phase fluorination catalyst. The hydrogen chloride is added into the reaction from an external source at a pressure of about 100 psigor more. The HCFC-244bb is an intermediate in the production of 2,3,3,3-tetrafluoropropene-1 (HFO-1234yf).

Description

[0001] Cross References to Related Applications [0002] This application claims the benefit of Provisional Patent Application US Application No. 61 / 087206, filed August 8, 2008, which is incorporated herein by reference. technical field [0003] The present invention relates to an improved process for the production of 2-chloro-1,1,1,2-tetrafluoropropane (HCFC-244bb), more particularly to the production of 2-chloro-3,3,3-trifluoropropane ( An improved method for preparing HCFC-244bb by reacting HCFO-1233xf) and hydrogen fluoride in a liquid phase reaction vessel in the presence of hydrogen chloride and a liquid phase fluorination catalyst. The HCFC-244bb is an intermediate in the preparation of 2,3,3,3-tetrafluoropropene (HFO-1234yf), which is a low global warming potential refrigerant. Background technique [0004] Fluorocarbon-based fluids find widespread use industrially in many applications, including refrigerants, aerosol propellants, blowing agents, heat transfer med...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C19/10C07C17/087C07C21/18C07C17/25
Inventor D·C·默克尔S·A·科特雷尔R·C·约翰逊
Owner HONEYWELL INT INC
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