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A preparation process of electronic grade hydrogen fluoride

A hydrogen fluoride, electronic-grade technology, applied in hydrogen fluoride, fluorine/hydrogen fluoride, chemical instruments and methods, etc., can solve problems such as increased processing difficulty and cost, performance impact, and fluorine gas is highly toxic

Active Publication Date: 2020-01-03
重庆市化工研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Prior art 1 uses fluorine gas as an oxidant to oxidize impurities in hydrogen fluoride, and removes high boiling substances such as HAsF by washing and rectifying methods 6 , MAsF 6 、H 2 SO 4 、H 2 O, H 2 SiF 6 、H 3 PO 4 etc. and volatile component SO 2 、SiF 4 、PF 3 、POF 3 , AsF 5 , SF 6 、PF 5 etc., the problems still to be solved are, first, fluorine gas is highly toxic, highly chemically active and strong oxidizing, and it is difficult to solve the sealing problem of existing conveying machinery such as circulating pumps, and serious safety accidents are likely to occur if leakage occurs; , the integration of rectification and washing in a rectification tower does not meet the technical specifications; prior art 2 points out that the impurity arsenic in hydrogen fluoride has a serious impact on the performance of electronic devices, and the removal of arsenic is a key technology for the purification of hydrogen fluoride. The method commonly used in the prior art is to use an oxidant to oxidize trivalent arsenic to a high-boiling point pentavalent arsenic compound, and then use distillation to remove it. The oxidant is usually potassium permanganate, hydrogen peroxide, potassium dichromate, etc. The problems to be solved are: first, the introduction of other impurities increases the difficulty and cost of subsequent treatment; second, the oxidation time is longer, generally reaching 6 to 48 hours, and the energy consumption is higher

Method used

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  • A preparation process of electronic grade hydrogen fluoride
  • A preparation process of electronic grade hydrogen fluoride
  • A preparation process of electronic grade hydrogen fluoride

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Embodiment Construction

[0032] The present invention will be further described below in conjunction with the drawings and specific embodiments.

[0033] Such as figure 1 , figure 2 , image 3 , Figure 4 , Figure 5 As shown, an electronic grade hydrogen fluoride preparation process is characterized in that it includes a transpiration cycle oxidation reaction process, a circulating fluidized bed rectification process, and a washing absorption condensation process.

[0034] Step 1, the evaporation cycle oxidation reaction process, the evaporation cycle reactor I is kept at normal pressure, the anhydrous hydrogen fluoride stored in the collecting tank 8 is heated and vaporized by the boiling pipe 6 and sent to the oxidation reactor 1 at a heating temperature of 30~ At 31°C, because the hydrogen fluoride in the boiling pipe 6 is transformed into a boiling state, the bubbling rises to become a gas-liquid mixed flow and enters the oxidation reactor 1. After the hydrogen fluoride liquid mixture flows through t...

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Abstract

The invention relates to the technical field of fluorine chemicals and in particular relates to electron-grade hydrogen fluoride preparation procedures which are characterized by comprising an evaporation circulation oxidation reaction procedure, a circulating fluidized bed distillation procedure and a washing, absorption and condensation procedure.

Description

Technical field [0001] The invention relates to the technical field of fluorine chemicals, in particular to an electronic grade hydrogen fluoride preparation process. Background technique [0002] Electronic grade hydrogen fluoride is mainly used as a cleaning agent and etchant in photovoltaics, integrated circuits and other industries. It is one of the key auxiliary materials for these industries. Because the impurity arsenic has a serious impact on the performance of electronic devices, the removal of arsenic is the purification of hydrogen fluoride The key technology, the usual method is to use an oxidizing agent to oxidize trivalent arsenic to a high-boiling pentavalent arsenic compound, and then use the difference in volatility to distill it out. Chinese invention patent (patent number CN201110276860.4, patent name is a method for preparing electronic grade hydrofluoric acid) discloses a method for preparing electronic grade hydrofluoric acid, including the following steps: ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B7/19B01D3/32B01D5/00
CPCB01D3/32B01D5/0003B01D5/0036B01D5/0054B01D5/0063C01B7/195C01B7/196
Inventor 杨松
Owner 重庆市化工研究院有限公司
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