Instant synthetic fluorocarbon spraying method.

The basic principle: Fluorine gas (F2) reacts immediately with carbon to produce carbon tetrafluoride, the reaction equation is as follows: C + 2F2→ CF4.

Process principle: The raw materials used in the production method are easy to obtain, good controllability, and high product purity. It is common in the current industry

The production method. However, the chemical reaction process is very intense and there is a risk of explosion. Therefore, it is necessary to use specific explosion inhibitors and techniques to adjust the reaction mechanism. Common explosion inhibitors include Brf2 and IF2, but they also have strong reactive activity of their own, adding new risks. This means that Air Products (AP) industrial production has successfully achieved a product purity of more than 99.99% to meet the needs of the electronics manufacturing industry. The second method of fluoromethane chloride hydrogen fluoride.

Basic principle: trifluoro-chloromethane (CF? Cl) Hydrogen chloride gas (HF) can synthesize carbon tetrafluoride for reaction, the reaction equation is as follows: CF? Cl + HF → CF?  Plus HCl. Process principle: simple production process, safe operation. However, due to the phasing out of CFCS and HCFCS, the source of raw materials required for these processes is limited and will eventually be discontinued. According to Japanese Daikin Industrial Co., LTD., they have produced a high-purity carbon tetrafluoride (CF?). It is made through a variety of reaction processes.

The third method is the ethane hydrogen fluoride process

The basic principle: Taking methane as an example, under the action of metal catalyst, methane gas and chlorine gas (Cl?) And hydrogen fluoride (HF) carbon tetrafluoride is produced in the gaseous state, the reaction equation is as follows: + 4Cl?  + 4HF → CF?  Plus 8HCl. Process principle: The technology is relatively mature, easy to use, and the acquisition of raw materials is relatively simple. However, the reaction process is difficult to control, the product variety is wide, and the yield is low, so it is gradually replaced by other processing processes. This means that manufacturer DuPont (France) uses HF-activated hydroxides or halides as metal catalysts.

Pyrolysis method

The basic principle is to heat the polytetrafluoroethylene plastic to a high temperature state, so that it dissolves and produces carbon tetrafluoride.

Process principle: Wide source of raw materials, low cost, but low product purity, while producing a lot of waste gas and waste.

Electrolytic salt water

Rationale: Carbon tetrafluoride is produced by electrolysis of chlorinated aqueous solutions.

Process principle: high product purity, low cost, but the need to use electrostatic precipitator and lithium battery electrolyte, equipment investment is relatively high. In addition, regardless of the production method used, the resulting crude tetrafluoride requires special treatment to improve its purity. The treatment process mainly includes pickling, adsorption and distillation.