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Azeotrope-Like Composition of 2-Chloro-3,3,3-Trifluoropropene (HCFC-1233xf) and Hydrogen Fluoride (HF)

Inactive Publication Date: 2009-09-10
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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  • Azeotrope-Like Composition of 2-Chloro-3,3,3-Trifluoropropene (HCFC-1233xf) and Hydrogen Fluoride (HF)

Examples

Experimental program
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Effect test

example 1

[0025]60 g of 2-chloro-3,3,3-trifluoropropene (HCFO-1233xf) were mixed with 40 g of HF to form a heterogeneous azeotrope mixture. The vapor pressure of the mixture at about 25° C. was about 38 psia.

example 2

[0026]Binary compositions containing solely 2-chloro-3,3,3-trifluoropropene (HCFO-1233xf) and HF were blended to form a 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 and HF as a function of composition with varying weight percent HF at constant temperatures of about 0, 25, and 61° C. The data also showed that HCFO-1233xf / HF is a heterogeneous mixture.

TABLE 1P-T-X of HCFO-1233xf / HFPressure (Psia)Mole % HFT = 0° C.T = 25° C.T = 61° C.0.008.8722.8864.5812.7014.2135.285.6222.5014.6938.48102.438.3415.0338.4106.0846.4615.0338.35107.3455.0615.0338.45106.9567.3915.0338.45106.9576.0615.0338.4510781.7215.0338.45107.0586.2715.0838.4102.8898.3612.5129.0472.5399.309.723.1761.72100.006.8717.8252.43

[0027]The data also shows that the mixture is azeotropic or azeotrope-like since the vapor pressure of the mixtur...

example 3

[0028]The azeotropic or azeotrope-like composition of the HCFO-1233xf / HF mixture was also verified by Vapor-Liquid-Liquid equilibrium (VLLE) experiment. 63.5 g of 2-chloro-3,3,3-trifluoropropene (HCFO-1233xf) were mixed with 36.5 g of HF to form a heterogeneous mixture (visual observation) at 24° C. The vapor composition, upper liquid (HF rich), and bottom liquid (organic) were sampled. The result shows that the azeotropic composition is about 82.5±1.2 mole percent HF at 24° C.

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Abstract

Provided are azeotropic and azeotrope-like compositions of 2-chloro-3,3,3-trifluoropropene (HCFO-1233xf) 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 / 034,184, filed Mar. 6, 2008, which is incorporated herein by reference.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention pertains to azeotropic and azeotrope-like compositions of 2-chloro-3,3,3-trifluoropropene (HCFO-1233xf) and hydrogen fluoride (HF). More particularly the invention pertains to such 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 Prior 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 chlorofluorocarbons might be detrimental to the Earth's ozone layer. Therefore, strat...

Claims

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Application Information

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IPC IPC(8): C09K3/00
CPCC07C17/38C07C17/383C07C17/206C07C21/18C11D7/5054C11D7/50
Inventor PHAM, HANG T.MERKEL, DANIEL C.POKROVSKI, KONSTANTIN A.TUNG, HSUEHSUNGSINGH, RAJIV R.
Owner HONEYWELL INT INC
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