Preparation method of chlorine trifluoride

The invention discloses a preparation method of chlorine trifluoride and belongs to the field of fine chemical engineering. The method comprises the following steps: carrying out a bubbling reaction on liquid-phase chloride and fluorine gas at a certain temperature to obtain a product 1; then charging the product 1, a diluent gas and fluorine gas in a synthesis reactor, and reacting at a certain temperature to obtain a product 2; finally carrying out liquidation, lightweight material discharge and vaporization treatments on the product 2 to obtain chlorine trifluoride. The raw materials in the preparation method are low in price and easily available, thus avoiding the adoption of chlorine with high corrosion and high toxicity, improving safety during production, transportation and storage processes; moreover, the reactor is simple in structure and convenient for material charging and discharging; the reaction conversion rate is high; by-products can be easily separated; and the preparation method can be put into industrial production easily.