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Fluorination reactor

a fluorination reactor and fluoride technology, applied in the field of fluorination reactors, can solve the problems of not always being able to achieve the predicted results in the laboratory, erroneous results may be obtained, sodium fluoride/bifluoride is not effective at removing hf from the gas stream, etc., and achieve the effect of increasing the yield

Active Publication Date: 2007-07-05
HONEYWELL INT INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

[0008] It has now been discovered that packing a fluorination reactor with a fluoride-adsorbent such as sodium fluoride will increase the yield in reactions where hydrogen-containing byproducts are possible. Removing HF from the reaction prevents the HF from reacting with the compound to be fluorinated to form unwanted hydrogen-containing byproducts.

Problems solved by technology

However, it is not always possible to achieve the predicted results in the laboratory.
Another reason is if a stable compound is omitted from the calculation, an erroneous result may be obtained.
Therefore at temperatures greater than 278 C., sodium fluoride / bifluoride is not effective at removing HF from a gas stream.
However, the use of metal fluorides to control the thermodynamically dictated distribution of reaction products is not known.

Method used

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Examples

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example 1

[0032] Fluorine diluted with nitrogen (about 18% F2 in N2) was introduced into the bottom of a 24″×2″ tubular reactor through a fritted disk welded into the tube. C2HF5 was introduced about 2 inches above the fluorine inlet at a C2HF5 to F2 ratio of about 1:1. The reaction zone temperature was 230 C. The crude product gas was passed sequentially through 10% aqueous KOH, 10% aqueous KI, anhydrous alumina and anhydrous calcium sulfate scrubbers and then condensed in a chilled cylinder. Based on gas chromatographic analysis of the collected product, conversion of C2HF5 was 90%, selectivity for C2F6 was 98%, and selectivity for CF4 was about 1.5%.

example 2

[0033] The reactor in Example 1 is filled with ⅛ inch sodium bifluoride pellets, heated to about 300 C., and swept with nitrogen gas until no HF was detected in the exit stream. The reactor is then cooled to 230 C. and Example 1 is repeated. The amount of CF4 is significantly reduced.

example 3

[0034] When the sodium bifluoride pellets in Example 2 become saturated with HF, the F2 and organic flows are stopped. The temperature is increased to 300 C. and the reactor is swept with nitrogen until no HF is detected in the exit stream. The reactor is then cooled to 230 C. and Example 1 is repeated. Essentially identical results to Example 2 are obtained.

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Abstract

Fluorination reactions in which an organic compound to be fluorinated is contacted with elemental fluorine and HF is produced as a byproduct are disclosed, wherein the elemental fluorine is contacted with the organic compound in the presence of a fluoride-adsorbing composition so that the amount of HF or another hydrogen-containing byproduct is reduced or eliminated. Reactor embodiments for the fluorination reactions are also disclosed.

Description

BACKGROUND OF THE INVENTION [0001] The present invention relates to improvements to fluorination reactions using elemental fluorine in which HF is formed as a byproduct. In particular, the present invention relates to fluorination reactions in which the reactants are contacted in the presence of an HF-adsorbing composition, so any HF formed is removed from the reaction system to prevent the formation of other undesirable hydrogen-containing byproducts. The present invention also relates to improved fluorination reactors with reaction zones packed with HF-adsorbing compositions. BACKGROUND ART [0002] Reactions of elemental fluorine (F2) with many materials, especially organic compounds, can be quite exothermic and CF4 is generally the thermodynamically preferred reaction product. Various reactor designs have been proposed to control such reactions and allow the fluorination to be halted short of producing high yields of CF4. For example, U.S. Pat. No. 4,377,715 describes the use of p...

Claims

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Application Information

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IPC IPC(8): C07C19/08B01J8/08
CPCB01J8/025B01J2208/0053B01J2208/00752B01J2208/00761B01J2208/00973B01J2219/00038B01J2219/00202C07C17/10B01J2219/00213B01J2219/00231C07B39/00C07C19/08Y02P20/582B01J8/04C07C17/013C07C17/07
Inventor LULY, MATTHEW H.
Owner HONEYWELL INT INC
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