Method for preparing bromine trifluoride

A technology for bromine trifluoride and crude bromine trifluoride, which is applied in the direction of interhalogen compounds, can solve the problems of high impurity content of bromine trifluoride, serious environmental pollution, and high equipment requirements, and achieve low environmental pollution, simple equipment, The effect of equipment operation safety

Active Publication Date: 2012-06-20
RES INST OF PHYSICAL & CHEM ENG OF NUCLEAR IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The disadvantage of the above method is that the bromine trifluoride has high impurity content, low purity, high equipment requirements and serious environmental pollution

Method used

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  • Method for preparing bromine trifluoride
  • Method for preparing bromine trifluoride

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Clean and dry the reactor, preheat the reactor to 100°C and evacuate to -0.095Mpa after passing the leak test for the seal of the reactor. Slowly open the valve in front of the reactor, feed fluorine gas into the reactor, and close the valve in front of the reactor after the pressure of the reactor reaches normal pressure. Open the inlet valve of the bromine raw material, feed bromine vapor and fluorine gas to carry out the synthesis reaction, and generate crude bromine trifluoride containing impurities. The reactor temperature was controlled at 120°C. After the reaction, the reactor pressure did not drop any more.

[0053] The bromine trifluoride liquid coming out of the reactor enters the distillation tower, and the distillation tower is heated to a temperature of 70°C. Open the valve in front of the receiver, and light impurities such as bromine pentafluoride and bromine simple substance enter the receiver from the top of the distillation tower for liquefaction. Th...

Embodiment 2

[0056] Clean and dry the reactor, preheat the reactor to 110°C and evacuate to -0.095Mpa after passing the leak test for the seal of the reactor. Slowly open the valve in front of the reactor, feed fluorine gas into the reactor, and close the valve in front of the reactor after the pressure of the reactor reaches normal pressure. Open the inlet valve of the bromine raw material, feed bromine vapor and fluorine gas to carry out the synthesis reaction, and generate crude bromine trifluoride containing impurities. The reactor temperature was controlled at 140°C. After the reaction, the reactor pressure did not drop any more.

[0057] The bromine trifluoride liquid coming out of the reactor enters the distillation tower, and the distillation tower is heated to a temperature of 80°C. Open the valve in front of the receiver, and light impurities such as bromine pentafluoride and bromine simple substance enter the receiver from the top of the distillation tower for liquefaction. Th...

Embodiment 3

[0060]Clean and dry the reactor, preheat the reactor to 120°C and evacuate to -0.095Mpa after passing the leak test for the seal of the reactor. Slowly open the valve in front of the reactor, feed fluorine gas into the reactor, and close the valve in front of the reactor after the pressure of the reactor reaches normal pressure. Open the inlet valve of the bromine raw material, feed bromine vapor and fluorine gas to carry out the synthesis reaction, and generate crude bromine trifluoride containing impurities. The reactor temperature was controlled at 160°C. After the reaction, the reactor pressure did not drop any more.

[0061] The bromine trifluoride liquid coming out of the reactor enters the distillation tower, and the distillation tower is heated to a temperature of 90°C. Open the valve in front of the receiver, and light impurities such as bromine pentafluoride and bromine simple substance enter the receiver from the top of the distillation tower for liquefaction. The...

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Abstract

The invention discloses a method for preparing bromine trifluoride. The method comprises the following steps of: (i) pre-treating a reactor, pre-heating the reactor to 100-120 DEG C, and pumping air out of the reactor till the pressure is about -0.095 MPa; (ii) carrying out synthetic reaction on fluorine gas and bromine vapor at a reaction temperature of 120-160 DEG C so as to obtain a crude product of bromine trifluoride; (iii) removing light-component impurities such as bromine pentafluoride and bromine elementary substance out of the crude product of bromine trifluoride; (iv) purifying bromine trifluoride; and (v) carrying out tail gas treatment. The method for preparing bromine trifluoride disclosed by the invention has the advantages of simple equipment, convenience for operation, safe equipment operation and little environment pollution. Furthermore, the purity of the product can be more than 98%.

Description

technical field [0001] The invention belongs to a method for preparing bromine trifluoride, in particular to a method for preparing bromine trifluoride by using fluorine gas and elemental bromine as raw materials. Background technique [0002] Bromine trifluoride (BrF 3 ) has strong oxidizing properties and strong reactivity, it is one of the strong oxidizing agents and is widely used in the preparation of inorganic chemical products. When synthesizing anhydrous metal fluorides, bromine trifluoride is a good fluorinating agent, which can convert metals, metal oxides, and metal chlorides, bromides and iodides into fluorides. [0003] It can be used as an inert solvent to dissolve fluorides such as sulfur hexafluoride, molybdenum hexafluoride, tungsten hexafluoride, etc. It can also be used as rocket propellant. [0004] At present, the methods for preparing bromine trifluoride mainly include the synthesis method of fluorine gas passing through liquid bromine in a bubbling ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B7/24
Inventor 李于教张春芳侯姝
Owner RES INST OF PHYSICAL & CHEM ENG OF NUCLEAR IND
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