Process for manufacturing perfluoroolefins by pyrolysis of perfluorocarbons in the presence of hydrogen
A technology of perfluorinated hydrocarbons and difluorocarbons, which is applied in the field of manufacturing perfluoroolefins, and can solve problems such as difficult removal of products and expensive purification steps
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
example
[0096] The pyrolysis experiments were carried out in a shock tube with an inner diameter of 10 cm as a model system of a pyrolysis reactor. The shock tube was heated with a heating mantle and had a viewing window for continuous recording by a UV photometer. The shock tube experiment is as and J. Troe, Helvetica Chimica Acta (Swiss Chemical Acta) 1972, 55, 2884. In a shock tube experiment, the test substance, a reactant mixture of perfluorinated hydrocarbons, hydrogen, and an inert carrier gas or diluent (argon), is fed into the low pressure section of the shock tube. The high pressure section contains hydrogen as the driving gas. The drive gas (in the observed portion of the test mixture) does not come into contact with the reaction mixture in the low pressure section. The low pressure section is separated from the high pressure section by an aluminum diaphragm. By increasing the pressure of the driving gas, the diaphragm ruptures and a shock wave is generated which propa...
example 1
[0101] A mixture of perfluoroethane (1.5 mol%), hydrogen (1.7 mol%), and argon (96.8 mol%) was fed into the high-pressure section of the shock tube (total gas concentration was 5.6 × 10 -5 mol cm -3 ). The mixture is incident on the shock wave ( figure 2 The first peak in ) is heated to a temperature of 610K, at which temperature, after the induction period, forms: CF 2 , and then the reflected shock reaches the observation window. The arrival of the reflected wave is determined by the second peak, namely figure 2 Indicated by distinct peaks in . The temperature behind the reflected wave is 1010K. The total gas concentration behind the reflected wave is 1.06×10 -4 mol cm -3 . :CF 2 Degradation curve and reaction 2: CF 2 →C 2 f 4 The rate constants at 1000K are in good agreement. The rate constant is k=1.3×10 17 cm 6 mol -2 the s -1 .
[0102] Thus, Example 1 shows that difluorocarbenes are formed under these reaction conditions and that difluorocarbenes are c...
example 2
[0103] Example 2 (comparative example)
[0104] Example 1 was repeated without using hydrogen. Failed to log to: CF 2 formed signal.
PUM
Login to View More Abstract
Description
Claims
Application Information
Login to View More