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AZEOTROPIC COMPOSITIONS OF 2-CHLORO-3,3,3-TRIFLUOROPROPENE (HCFC-1233xf), 2-CHLORO-1,1,1,2-TETRAFLUOROPROPANE (HCFC-244bb), AND HYDROGEN FLUORIDE (HF)

a technology of trifluoropropene and composition, which is applied in the field of ternary azeotropic and azeotropelike compositions of 2chloro-3,3,3-trifluoropropene, and 2chloro-1,1,1,2-tetrafluoropropane (hcfc-244bb), which can solve the problem that complete halogenation of chlorofluorocarbons might be detrimental to the earth's

Active Publication Date: 2009-10-15
HONEYWELL INT INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In recent years there has been universal concern that completely halogenated chlorofluorocarbons might be detrimental to the Earth's ozone layer.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0027]37.4 pounds of the material containing 3 weight percent HF balanced with mixture of organics consisting of 44.4 weight percent HCFC-244bb and 55.6 weight percent HCFO-1233xf was charged into the distillation column. The mixture was homogeneous. The distillation column consisted of a 10 gallon reboiler, 2 inch ID by 8 feet propack column, and a shell and tube condenser. The column had about 30 theoretical plates. The distillation column was equipped with temperature, pressure, and differential pressure transmitters. The distillation was run at pressure of about 23-25 psig. The distillate was sampled, titrated for HF concentration determination, and analyzed by GC at regular intervals. Analysis showed a ternary azeotrope of HF / HCFC-244bb / HCFO-1233xf. The HF concentration of the azeotrope was analyzed to be about 25-33 wt % HF using titration with 0.1 N KOH. The organic concentration based on GC area % was about 17-21 GC area % HCFC-244bb and about 79-83 GC area % HCFO-1233xf. At...

example 2

[0028]The following example used a Monel distillation column consisting of a 2 liter reboiler, 1 inch ID×4 feet long helicoil packed column, and tube and shell condenser. The column was equipped with temperature, pressure, and differential pressure transmitters. 1000 grams of material containing about 3.2 wt % HF balanced with mixture of organics consisting of about 51 weight percent HCFC-244bb and 49 weight percent HCFO-1233xf were charged into the distillation system. The mixture was homogeneous. The distillation was performed at a pressure 7-29 psig. Analysis of distillate samples showed consistent results at a pressure above 18 psig. The organic composition by GC was determined to be about 21-23 GC Area % HCFC-244bb and about 79-77 GC Area % HCFO-1233xf and the concentration of HF in the distillate was found to be about 25-29 weight % HF using titration with 0.1 N NaOH. The decrease in the amount of HF in the sample occurred sharply indicating a ternary azeotrope of HCFC-244bb / H...

example 3

[0029]Ternary compositions containing a mixture of 2-chloro-3,3,3-trifluoropropene (HCFO-1233xf) and 2-chloro-1,1,1,2-tetrafluoropropane (HCFC-244bb) (50 / 50%) and HF were blended to form a ternary heterogeneous azeotrope mixtures at different compositions. The vapor pressures of the mixtures were measured at about 0, 25 and 61° C. and the following results were noticed. Table 1 shows the vapor pressure measurements of HCFO-1233xf, HCFC-244bb, and HF as a function of composition with varying weight percent HF at constant temperatures of about 0° C., 25° C., and 61° C. The data also showed that in this range of hydrogen fluoride concentration the mixture of HCFO-1233xf / HCFC-244bb / HF is heterogeneous.

TABLE 1P-T-X of [HCFO-1233xf / HCFC-244bb (50 / 50%)] / HFPressure (Psia)Wt. % HFT = 0° C.T = 25° C.T = 61° C.09.423.865.07.2915.238.4104.014.5915.238.5107.722.1315.138.4107.231.6015.138.3107.237.3215.138.5107.2100.06.8717.852.4

[0030]The data also show that the mixture is azeotropic or azeotrope...

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Abstract

Provided are ternary azeotropic and azeotrope-like compositions of 2-chloro-3,3,3-trifluoropropene (HCFO-1233xf), 2-chloro-1,1,1,2-tetrafluoropropane (HCFC-244bb), and hydrogen fluoride (HF). Such azeotropic and azeotrope-like compositions are useful as intermediates in the production of 2,3,3,3-tetrafluoropropene (HFO-1234yf).

Description

CROSS REFERENCE TO RELATED APPLICATION[0001]This application claims the benefit of U.S. Provisional patent application Ser. No. 61 / 043,451 filed Apr. 9, 2008, which is incorporated herein by reference.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention pertains to ternary azeotropic and azeotrope-like compositions of 2-chloro-3,3,3-trifluoropropene (HCFO-1233xf), 2-chloro-1,1,1,2-tetrafluoropropane (HCFC-244bb), and hydrogen fluoride (HF). More particularly the invention pertains to such ternary azeotropic and azeotrope-like compositions which are useful as intermediates in the production of 2,3,3,3-tetrafluoropropene (HFO-1234yf).[0004]2. Description of the Related Art[0005]Traditionally, chlorofluorocarbons (CFCs) like trichlorofluoromethane and dichlorodifluoromethane have been used as refrigerants, blowing agents and diluents for gaseous sterilization. In recent years there has been universal concern that completely halogenated chlorofluorocarbo...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C09K3/00B01D3/36
CPCC07C21/18C07C19/10B01D3/36C09K5/04
Inventor MERKEL, DANIEL C.POKROVSKI, KONSTANTIN A.TUNG, HSUEHSUNGPHAM, HANG T.SINGH, RAJIV R.
Owner HONEYWELL INT INC
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