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Process for the separation of fluorocarbons using ionic liquids

A technology of ionic liquids and mixtures, applied in chemical instruments and methods, organic chemistry, halogenated hydrocarbon preparation, etc., can solve the problems of difficult separation, inability to achieve, high investment cost and production cost, etc.

Inactive Publication Date: 2010-07-28
EI DU PONT DE NEMOURS & CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the tendency of these components in mixtures to form azeotropes, azeotrope compositions, or azeotrope-like compositions, these close boiling points make it difficult to effectively separate R-134 from R-134 by conventional distillation methods
In order to achieve separation by conventional distillation methods, it is necessary to operate tall columns with impractically high heights at high reflux ratios, which can result in high capital and production costs and can also result in significant loss of product yield

Method used

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  • Process for the separation of fluorocarbons using ionic liquids
  • Process for the separation of fluorocarbons using ionic liquids
  • Process for the separation of fluorocarbons using ionic liquids

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0189] Separation of 1,1,2,2-tetrafluoroethane (R-134) and 1,1,1,2-tetrafluoroethane (R-134a)

[0190] This example focuses on the thermodynamic properties at infinite dilution. Pair in [bmim][PF 6 ] and [emim][Tf 2 N] in R-134 and R-134a, analysis of the activity coefficient γ at infinite dilution.

[0191] R-134 and R-134a in [bmim][PF 6 ] and [emim][Tf 2 The experimental solubility (PTx) data in N] are summarized in Examples 3 and 4 (for [bmim][PF 6 ]) and Examples 5 and 10 (for [emim][Tf 2 N]). Data have been corrected using a nonrandom two-liquid (NRTL) solution model. NRTL (S.I., Sandler, "Chemical and Engineering Thermodynamics" 3rd Edition (1999), John Wiley and Sons, Inc., New York, Chapter 7) activity coefficient (γ i ) model is given by:

[0192] ln γ 1 = x 2 2 [ τ 21 ( ...

Embodiment 2

[0221] Separation of mixtures containing 1,1,1,2-tetrafluoroethane and 1,1,2,2-tetrafluoroethane .

[0222] Using Aspen Plus TM (Aspen Technology, Inc., version 13.2, Cambridge, MA) process simulator, for the use of [emim][Tf 2 N] as extractant, separated by extractive distillation containing 1,1,1,2-tetrafluoroethane (also known as HFC-134a or R-134a) and 1,1,2,2-tetrafluoroethane ( Also known as HFC-134 or R-134) mixtures are simulated.

[0223] Think of ionic liquids as non-dissociated liquids with extremely low vapor pressures. The nonrandom two-liquid (NRTL) activity coefficient model (S.I., Sandler, "Chemical and Engineering Thermodynamics", 3rd edition (1999), John Wiley and Sons, Inc., New York, Chapter 7) was used to simulate the relationship between ionic liquids and Liquid-phase interactions between fluorocarbons and the vapor phase modeled using the Peng-Robinson equation of state. Binary NRTL interaction parameters of ionic liquids with fluorocarbons...

Embodiment 3

[0232] 1,1,2,2-tetrafluoroethane (R-134) in 1-butyl-3-methylimidazolium hexafluorophosphate [bmim][PF 6 ] Solubility in

[0233] Solubility studies were carried out at temperatures ranging from about 10°C to 75°C and pressures ranging from 0.1 bar (0.01 MPa) to about 3.5 bar (0.35 MPa), where R-134 was determined using a gravimetric microbalance in [bmim][PF 6 ] Solubility (x) or mole fraction in ]. Table 4 provides T, P and x data, respectively.

[0234] Table 4

[0235] T(℃) P(bar) R-134(mol fraction)

[0236] 10.01 0.10 0.029

[0237] 9.97 0.50 0.176

[0238] 9.99 1.00 0.357

[0239] 9.99 1.50 0.528

[0240] 9.97 2.00 0.686

[0241] 9.98 2.50 0.814

[0242] 9.96 3.00 0.974

[0243] 25.02 0.10 0.024

[0244] 24.93 0.50 0.116

[0245] 24.89 1.00 0.225

[0246] 24.93 1.50 0.330

[0247] 24.92 2.00 0.428

[0248] 25.00 2.50 0.522

[0249] 24.90 3.00 0.611

[0250] 24.94 3.50 0.689

[0251] 49.97 0.10 0.00...

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Abstract

This invention relates to a process for separating 1,1,2,2-tetrafluoroethane or 1,1,1,2-tetrafluoroethane from a mixture comprising both 1,1,1,2-tetrafluoroethane and 1,1,2,2-tetrafluoroethane wherein at least one ionic liquid is used to enhance the efficiency of the separation.

Description

[0001] This patent application claims priority to US Provisional Application 60 / 940,292, filed May 25, 2007, which is hereby incorporated by reference in its entirety as a part of this document for all purposes. technical field [0002] The present invention relates to a method for separating various compound isomers contained together in the same mixture. In particular, the present invention relates to the separation of 1,1,2,2-tetrafluoroethane from a mixture comprising 1,1,1,2-tetrafluoroethane and 1,1,2,2-tetrafluoroethane or 1,1,1,2-tetrafluoroethane, wherein at least one ionic liquid is used to enhance separation efficiency. Background technique [0003] 1,1,1,2-Tetrafluoroethane CF 3 CH 2 F (also known as HFC-134a, F-134a or R-134a) can be used as refrigerant, aerosol propellant, heat transfer medium, gas dielectric, fire extinguishing agent, expansion agent for polyolefins and polyurethanes, absorption Fluids for cooling systems, and working fluids for power cycle...

Claims

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Application Information

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IPC IPC(8): C07C17/386C07C19/08
CPCC07C17/386C07C19/08
Inventor M·B·希夫莱特A·约科泽基J·P·克纳普
Owner EI DU PONT DE NEMOURS & CO
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