Hexafluoropropylene production method
A technology of hexafluoropropylene and a production method, applied in chemical instruments and methods, halogenated hydrocarbon preparation, organic chemistry, etc., can solve problems such as hindering yield improvement, self-polymerization of tetrafluoroethylene, flying temperature at the outlet, etc. Improved heat transfer, less by-products, and accurate reaction temperature adjustment
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Embodiment 1
[0013] In this embodiment, the tubular reactor is heated in three stages, and the mixed gas contains 73.67% tetrafluoroethylene (TFE) and 26.33% octafluorocyclobutane (C-318) (including 6.1% perfluorobutene). The tubular reactor is a ф32×3mm stainless steel tube with a length of 13.0m; each section adopts indirect heating, the first and second sections are both 1.5m long, and each has a temperature monitoring point; a temperature monitoring point. Its production method is:
[0014] A. First put TFE at 25.0Nm 3 / h, C-318 at 7.1Nm 3 The flow rate of / h is input into the mixer and mixed evenly under the pressure of 15KPa;
[0015] B. Input the above-mentioned homogeneously mixed cracked gas into the tubular preheater, preheat it to 450°C and directly input it into the tubular reactor;
[0016] C. The input of the preheated mixed cracked gas, the heating temperature of the first section is 851°C (the temperature of the outer tube wall of the reactor, the same below), the secon...
Embodiment 2
[0021] TFE70.92% in the mixed gas of this example, C-318 is 29.08% (which contains perfluorobutene 12.0%); the tubular reactor is directly heated in 6 sections, and the length of each heating section 1-5 is 3.0m , each set up a temperature monitoring point, the sixth section is 11.5m long, with 3 temperature monitoring points. The present embodiment method is:
[0022] A. TFE at 25.1Nm 3 / h, C-318 at 7.6Nm 3 The flow rate of / h is input into the mixer and mixed evenly under the pressure of 11.0KPa;
[0023] B. Input the above-mentioned mixed gas into the tubular preheater to preheat to 550°C and then directly input it into the tubular reactor;
[0024] C. The preheated mixture is heated at 741°C in the first section, 754°C in the second section, 760°C in the third section, 767°C in the fourth section, 760°C in the fifth section, and 760°C in the sixth section. The pyrolysis reaction was heated under the condition of 776° C., and the reaction residence time was 1.5 seconds....
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