Preparation method of 2, 3, 3, 3-tetrafluoropropene
A technology of tetrafluoropropene and R22, applied in the field of chemistry, can solve the problems such as unreported HFO-1234yf, difficult to obtain, expensive and the like
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Embodiment 1
[0036] A kind of preparation method of 2,3,3,3-tetrafluoropropene, difluorochloromethane (R 22 ) and monochloromethane (methyl chloride) as raw materials, cracking reaction occurs under high temperature conditions to obtain 2,3,3,3-tetrafluoropropene. The chemical reaction equation is as follows:
[0037] 2CHClF 2 +CH 3 Cl→CF 3 CF=CH 2 +3HCl
[0038] Charge 27.3 g of monochloromethane and 93.5 g of difluorochloromethane into a steel cylinder with a volume of 8 L, and then charge with 5 g of nitrogen gas for premixing.
[0039] A SUS316 stainless steel tubular reactor device with an inner diameter of 6mm and a length of 40cm is placed in a ceramic tube. The ceramic tube is wrapped with resistance wire, and is kept insulated with aluminum silicate insulation cotton. It is heated by resistance wire with a temperature controller and thermoelectric Even control the temperature required for the reaction.
[0040] Adjust the display of the temperature controller, preheat the r...
Embodiment 2
[0042] As described in Example 1, the difference is: adjust the display of the temperature controller, first preheat the reaction device, and after the temperature is stabilized at 850 ° C, feed nitrogen into the reaction device for replacement, and replace the reaction device for 3 After -5min, the reaction mixture that has been mixed is passed into the reaction device, the flow rate of the mixed gas entering the reaction device is controlled by a flow meter to be 6.78L / min, the control system pressure is 0.4MPa, and the product from the reaction device is mixed The stream is introduced into a quenching device filled with lye, and quenched to obtain a mixture stream containing 2,3,3,3-tetrafluoropropene (HFO-1234yf); sampling gas chromatography analysis shows that 2,3,3,3 - The mass fraction of tetrafluoropropene is 14.1%. After drying, the mixture stream is separated to finally obtain 2,3,3,3-tetrafluoropropene product.
Embodiment 3
[0044] As described in Example 1, the difference is: adjust the reading of the temperature controller, first preheat the reaction device, and after the temperature is stabilized at 950 ° C, feed nitrogen into the reaction device for replacement, and replace the reaction device for 3 After -5min, the reaction mixture that has been mixed is passed into the reaction device; other steps are the same as in Example 1. The mixture stream was sampled and analyzed by gas chromatography, and the mass fraction of 2,3,3,3-tetrafluoropropene in the mixed product was 13.2%.
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