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Technology for preparing high-purity nitrogen trifluoride by removing impurities contained in nitrogen trifluoride through rectification method

A nitrogen trifluoride, rectification technology, applied in the direction of nitrogen and non-metallic compounds, can solve problems such as environmental pollution, and achieve the effect of convenient use and reasonable design

Inactive Publication Date: 2011-06-22
天津东方宜信物流有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This technology not only has reasonable process and simple preparation, but also has good product quality. The mass fraction of nitrogen trifluoride produced is over 98%, and it solves the problem of environmental pollution

Method used

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  • Technology for preparing high-purity nitrogen trifluoride by removing impurities contained in nitrogen trifluoride through rectification method
  • Technology for preparing high-purity nitrogen trifluoride by removing impurities contained in nitrogen trifluoride through rectification method

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Embodiment Construction

[0011] refer to figure 1 ,1 # Distillation tower 1, 1 # Distillation column condenser 2, 1 # Rectification column bottom liquid vaporizer 3, 2 # Rectification column bottom liquid vaporizer 4, 2 # Distillation tower 5, 2 # The rectifying column condenser 6 is assembled into one body through the connecting pipeline 7 according to its system function.

[0012] Use chemical reaction production process of the present invention:

[0013] Nitrogen trifluoride mixture containing impurities such as difluorohydrazine, tetrafluorohydrazine and carbon tetrafluoride enters 1 # The rectifying tower 1 carries out extraction and rectification, and under normal conditions, the extractant with a boiling point higher than that of nitrogen trifluoride is as HCFC-22, HFC-41, PFC-116, HFC-23, N 2 O.CO 2 etc. The boiling point range of the extractant is generally -90--20°C. pass 1 # Rectification tower 1 makes carbon tetrafluoride and nitrogen trifluoride, difluorohydrazine, tetrafluorohy...

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Abstract

The invention discloses a technology for preparing high-purity nitrogen trifluoride by removing impurities contained in nitrogen trifluoride through a rectification method, mainly comprising a 1# rectifying tower, a 1# rectifying tower condenser, a 1# rectifying tower residue vaporizer, a 2# rectifying tower residue vaporizer, a 2# rectifying tower and a 2# rectifying tower condenser which are assembled into a whole according to systemic functions through connecting pipelines. The invention has the advantages of reasonable design and convenience for use and is an ideal process technology for preparing the nitrogen trifluoride.

Description

Technical field [0001] The invention relates to a process technology for the preparation of chemical product-nitrogen trifluoride, in particular to a technology for preparing high-purity nitrogen trifluoride by removing impurities in nitrogen trifluoride by rectification, which is suitable for chemical synthesis of nitrogen trifluoride . Background technique [0002] Currently, nitrogen trifluoride is produced by infiltrating nitrogen trifluoride (NF3) containing carbon tetrafluoride (CF4) impurities into a bed of zeolite 3A, 4A or 5A as follows to selectively adsorb nitrogen trifluoride onto the On the above-mentioned bed, nitrogen trifluoride is then desorbed from the bed. This method cannot comprehensively remove impurities and takes a very long time. This method is not suitable for continuous production, and the output rate is relatively low. Contents of the invention [0003] The problem to be solved by the present invention is to overcome the deficiencies of the pri...

Claims

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Application Information

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IPC IPC(8): C01B21/083
Inventor 李中元
Owner 天津东方宜信物流有限公司
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