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Method for reducing alkyne impurities in fluoroolefins

An impurity and zeolite technology, applied in the field of reducing alkyne impurities in fluoroolefins, can solve problems such as wide application limitations

Active Publication Date: 2022-01-18
THE CHEMOURS CO FC LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because of their contribution to global warming, HFCs have come under scrutiny and their widespread use may be limited in the future

Method used

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  • Method for reducing alkyne impurities in fluoroolefins

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-2

[0246] Embodiment 1-2 (comparison)

[0247] Examples 1-2 demonstrate that the CF contained in HFO-1234yf cannot be removed by Zeolite 3A 3 C≡CH impurity. Zeolite 3A has a pore opening of about 3 Angstroms and a Sanderson electronegativity of about 2.25.

[0248] make as indicated in Table 1 containing CF 3 A gaseous HFO-1234yf sample of C≡CH impurity was passed through a scrubber (7 inches long, 1.25 inches ID) containing approximately 100 ml of activated Zeolite 3A at room temperature. The exhaust gas from the scrubber was analyzed by GC and GC-MS. The results of the analysis are also listed in Table 1.

Embodiment 3-4

[0249] Embodiment 3-4 (comparison)

[0250] Examples 3-4 demonstrate that the CF contained in HFO-1434yf cannot be removed by Zeolite 4A 3 C≡CH impurity. Zeolite 4A has a pore opening of about 4 Angstroms and a Sanderson electronegativity of about 2.32.

[0251] make as indicated in Table 1 containing CF 3 A gaseous HFO-1234yf sample of C≡CH impurity was passed through a scrubber (7 inches long, 1.25 inches ID) containing approximately 100 ml of activated Zeolite 4A at room temperature. The exhaust gas from the scrubber was analyzed by GC and GC-MS. The results of the analysis are also listed in Table 1.

Embodiment 5-7

[0253] Examples 5-7 demonstrate that following contact with zeolite 5A, sufficient reduction in CF 3 CF in the mixture of C≡CH impurity and HFO-1234yf 3 Concentration of C≡CH impurity. Zeolite 5A has a pore opening of about 5 Angstroms and a Sanderson electronegativity of about 2.56.

[0254] make as indicated in Table 1 containing CF 3 A gaseous HFO-1234yf sample of C≡CH impurity was passed through a scrubber (7 inches long, 1.25 inches ID) containing about 100 ml of activated Zeolite 5A at room temperature. The exhaust gas from the scrubber was analyzed by GC and GC-MS. The results of the analysis are also listed in Table 1.

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Abstract

The present invention relates to a method for reducing alkyne impurities in fluoroalkenes. In particular, the present disclosure relates to methods comprising: contacting a mixture comprising at least one fluoroalkene and at least one alkyne impurity with at least one zeolite to reduce the concentration of the at least one alkyne impurity in the mixture ; where R f is a linear perfluorinated alkyl group, X is H, F, Cl, Br, or I; and the at least one zeolite is selected from zeolites having a pore opening of at least 4 Angstroms and not greater than about 5 Angstroms, having a pore opening of at least about 5 Angstroms zeolites and mixtures thereof with a pore size of , and a Sanderson electronegativity of not greater than about 2.6; with the proviso that the at least one zeolite is not zeolite 4A. The present disclosure also relates to a method for preparing at least one selected from CF 3 CF=CH 2 、CF 3 CH=CHF and the method for the hydrotetrafluoropropene product of its mixture; And relate to for preparing at least one selected from CF 3 CCl=CH 2 、CF 3 CH = CHCl and its mixture of hydrochlorotrifluoropropene product method.

Description

[0001] This patent application is a divisional application of the patent application with the application number 201480027843.9 and the application date of March 14, 2014, with the same title. technical field [0002] The present disclosure relates to the reduction of alkynes (R f C≡CX) impurity concentration method. Background technique [0003] Many industries have spent the past several decades researching to find replacements for the ozone-depleting chlorofluorocarbons (CFCs) and hydrochlorofluorocarbons (HCFCs). CFCs and HCFCs have been used in a wide variety of applications, including their use as aerosol propellants, refrigerants, cleaning agents, expansion agents for thermoplastic and thermoset foams, heat transfer media, gaseous dielectrics, fire extinguishing and suppression agents, power cycle work Fluids, Polymerizing Media, Particle Removal Fluids, Carrier Fluids, Polishing Abrasives and Displacement Drying Agents. In the search for replacements for these comm...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C17/25C07C17/20C07C17/389B01J29/06C07C21/18C07C19/10C07C17/395C07C17/087
CPCB01J29/06C07C17/087C07C17/206C07C17/25C07C17/389C07C17/395C07C19/10C07C21/18Y02P20/582
Inventor M.J.纳帕孙学慧D.R.科尔宾H.科普卡利汪海有
Owner THE CHEMOURS CO FC LLC