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Method for separating gas

A technology of ionic liquid and gas mixture, which is applied in separation methods, gas treatment, and separation of dispersed particles, and can solve the problem of high cost

Inactive Publication Date: 2007-10-03
SOLVAY FLUOR GMBH DE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] However, since C(O)F 2 and the fact that the boiling point of HCl is relatively close, the cost of separation by distillation is very high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] Embodiment 1: from containing C (O) F 2 Separation of HCl from a mixture of

[0063] 1.1 Using 1-ethyl-3-methylimidazolium ethylsulfate at room temperature

[0064] CHF using the method of unpublished European patent application 04 00 5421.5 described above 2 Preparation of C(O)F by Photooxidation of Cl 2 / HCl gas mixture. The composition is 45%C(O)F 2 , 34% HCl, 6% O 2 And the crude gas mixture of other reaction components (raw material etc.) passes through containing 115g (0.49mol) 1-ethyl-3-methylimidazolium ethylsulfate (" EMIM Ethyl Sulfate”) wash bottle. To obtain hydrolysis-sensitive components of gas mixtures (e.g. C(O)F 2 ), it is advantageous to remove or minimize moisture in the device or in the ionic liquid. This was achieved by purging the device with dry nitrogen and evacuating it while heating the ionic liquid.

[0065] Immediately after the start of the test, the following gas composition was detected by gas chromatography downstream of the bott...

example 2

[0085] Example 2: From PF via triflate 5 Separation of HCl

[0086] By condensing the appropriate amount of PF 5 and HCl made containing 56% PF 5 and 44% HCl test mixture. The mixture was passed through a wash bottle containing 100 g of EMIM triflate at a flow rate of 0.8 mol / h for 15 minutes at room temperature. During this time, the ionic liquid absorbs HCl. Desorption was then carried out by applying a vacuum of 1 mbar at 100° C. for 30 minutes.

[0087] Due to the difficulty of detecting PF using gas chromatography 5 , so the following method was used: the exhaust gas stream from the desorption was passed through a gas wash bottle containing 100 g of 0.1 N NaOH solution (Titrinorm, VWR). Ion chromatography of the obtained acid scrubbing solution showed a chloride to fluoride ratio of 95:5. For comparison, the initial mixture (44% HCl, supplemented to 100% PF 5 ) through 100 g of 0.1 N NaOH solution. Ion chromatography showed a chloride to fluoride ratio of 60:40. ...

Embodiment 3

[0089] Example 3: Separation of Hydrogen Fluoride (HF) and Hydrogen Chloride (HCl) from Trifluoroacetyl Fluoride (TFAF) by EMIM Triflate

[0090] Trifluoroacetyl chloride (TFAC) and hydrogen fluoride (HF) were stirred overnight in an autoclave at 50 °C. The resulting mixture of TFAF and HCl and unreacted TFAC and HF was passed through 100 g of EMIM triflate. The composition of the gas mixture (56% TFAF, 34% HCl, 7% TFAC) was measured by gas chromatography before the gas mixture was passed through the ionic liquid. The presence of HF in the gas mixture was qualitatively detected by observing the corroded surface of the glass before passing through the ionic liquid.

[0091] After passing through the ionic liquid, the following composition of the gas mixture was measured by gas chromatography: 86% TFAF, 2% HCl, 11% TFAC. Analysis of the halide ions from the absorbed ionic liquids found not only the expected chloride anions but also fluoride anions. These ions are not present ...

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Abstract

Gas mixtures, which contain HF, HCl or HBr and other constituents, particularly gas mixtures, which contain carboxylic acid fluorides, C(O)F2 or phosphorus pentafluoride as well as HCl and, optionally, HF, can be separated into their individual constituents by using ionic liquids.

Description

technical field [0001] The present invention relates to a method for separating a mixture comprising HCl, HF and / or HBr and other components, especially comprising C(O)F 2 , phosphorus pentafluoride or specific acid fluorides and mixtures of HCl and possibly HF. Background technique [0002] Gaseous organic acid fluorides such as CF 3 C(O)F or CHF 2 C(O)F is a raw material for fluorine-containing organic compounds, such as fluorovinyl ether as a comonomer for resins or elastomers. CF has been proposed 3 C(O)F as a pesticide. As a result of this method of preparation, the fluorides of the acids contain HCl or HBr and sometimes HF. [0003] Phosphorus pentafluoride is an intermediate in the preparation of electrolyte salts for lithium batteries. For example, it can be treated with lithium fluoride to form lithium hexafluorophosphate. Phosphorus pentafluoride can be prepared from phosphorus pentachloride or phosphorus trichloride and chlorine and hydrogen fluoride. In t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B7/07C01B7/19C01B7/09C07C51/64B01D53/14C07D233/54
CPCB01D53/1456B01D2257/2042B01D2257/2045C01B7/093B01D53/1493C01B7/0737C01B7/0731C01B7/195C07C51/47C07D233/64C07C53/48C07C53/46C07C53/40C01B7/07C01B7/09C01B7/19B01D53/14
Inventor 延斯·奥尔席姆克萨斯基亚·布劳克米勒卡斯滕·布勒施
Owner SOLVAY FLUOR GMBH DE
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