Method for preparing tetrafluoroethylene and producing hexafluoropropylene by catalytic cracking of trifluoromethane
A trifluoromethane, catalytic cracking technology, applied in the field of fine chemicals, can solve the problems of further improvement of trifluoromethane conversion rate and total selectivity, increase of production cost, high reaction temperature, etc., to reduce post-processing cost and low cost , The effect of simple preparation method
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[0043] Example 1
[0044] A method for preparing tetrafluoroethylene and co-producing hexafluoropropylene by catalytic cracking of trifluoromethane, the reaction equation involved is:
[0045]
[0046] Including steps:
[0047] (1)5%wtCsF / Al 2 O 3 The supported catalyst is prepared as follows: 5gCsNO 3 Dissolved in water, prepared into 5wt% CsNO 3 Aqueous solution, namely immersion solution; 100g dried Al 2 O 3 The carrier was put into the dipping solution, immersed for 20 minutes and then taken out, dried at 100°C for 3 hours to obtain the precursor; then calcined in a nitrogen atmosphere at 400°C for 6 hours; the resulting product was put into In the reaction tube, pass N 2 , N 2 The flow rate is 300ml / min, and it is dried at a temperature of 300°C for 24h. Then pass in trifluoromethane gas for fluorination at 300°C at a flow rate of 6L / min, and turn off nitrogen after 2h; pass trifluoromethane alone at a flow rate of 6L / min and fluoride at 350°C for 60h, and finally get the catal...
Example Embodiment
[0054] Example 2
[0055] A method for preparing tetrafluoroethylene and co-producing hexafluoropropylene by catalytic cracking of trifluoromethane, which differs from Example 1 is:
[0056] The supported catalyst used is 3.6%wtLaF 3 / Al 2 O 3 , Its preparation method is the same as that of the supported catalyst in Example 1, except that 3.6gLa(NO 3 ) 3 Dissolved in water and prepared into 3.6wt% La(NO 3 ) 3 Aqueous solution, i.e. immersion solution; other steps are the same as in Example 1;
[0057] In step (2), the space velocity of trifluoromethane is 20h -1 ;
[0058] The other steps and conditions are the same as in Example 1.
[0059] After the cyclic reaction in this embodiment, the conversion of trifluoromethane was 86%, and the total selectivity of tetrafluoroethylene and hexafluoropropylene was 97%.
Example Embodiment
[0060] Example 3
[0061] A method for preparing tetrafluoroethylene and co-producing hexafluoropropylene by catalytic cracking of trifluoromethane, which differs from Example 1 is:
[0062] The supported catalyst used is 1%wtPtF 4 / Al 2 O 3 , Its preparation method is the same as that of the supported catalyst in Example 1, except that: 1gPtCl 4 Dissolved in water, prepared into 1wt% PtCl 4 Aqueous solution, i.e. immersion solution; other steps are the same as in Example 1;
[0063] In step (2), the space velocity of trifluoromethane is 1000h -1 ;
[0064] The other steps and conditions are the same as in Example 1.
[0065] After the cyclic reaction in this embodiment, the conversion of trifluoromethane was 87%, and the total selectivity of tetrafluoroethylene and hexafluoropropylene was 98%.
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