Purification process of high-purity anhydrous hydrogen fluoride

An anhydrous hydrogen fluoride, high-purity technology, applied in the direction of hydrogen fluoride, fluorine/hydrogen fluoride, etc., can solve the problems of non-continuous industrial production, high impurity content of waste acid, low utilization value, etc., achieve low production cost, improve purity, and equipment little effect

Inactive Publication Date: 2020-11-17
福建瓮福蓝天氟化工有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] 1. The process is complicated and many equipments are used;
[0009] 2. Although the equipment is simple during intermittent operation, it cannot be used for continuous industrial production;
[0010] 3. The yield of the obtained product is low, and a large amount of waste acid is produced with high impurity content and low utilization value

Method used

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  • Purification process of high-purity anhydrous hydrogen fluoride
  • Purification process of high-purity anhydrous hydrogen fluoride

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] First, the raw material industrial grade HF is cooled to about 10°C in the pre-cooler E-5104 to ensure that the medium entering the reactor is in the liquid phase, and the feed rate is 2500kg / h.

[0049] Then use the principle of electrolytic fluorine production to control the fluorine gas produced by the electrolysis voltage (8-10V), and control the amount of industrial anhydrous hydrogen fluoride in the electrolysis tank through the liquid level of the electrolysis tank. The amount of fluorine gas produced depends on the electrolysis current and electrolysis time. Controlled, the fluorine gas generated in the anode chamber enters the hydrogen fluoride absorption tower through the channel, and oxidizes a small amount of impurities in anhydrous hydrogen fluoride to form light and heavy components that are easy to separate; the fluorine-containing hydrogen gas generated in the cathode cell is connected to the E-5102 for cooling through the negative pressure pipe Recover a...

Embodiment 2

[0057] The process conditions and equipment are the same as in Example 1, except that the circulation rate of the fluorine oxidation reaction is 15000 kg / h, and the feed rate of the fluorine gas is 0.5g / per 1kgHF. In order to prevent the accumulation of impurities, the The still draws 70kg / h material and enters in the V-5100, and other conditions are the same as embodiment 1.

Embodiment 3

[0059] The process conditions and equipment are the same as in Example 1, except that the circulation rate of the fluorine oxidation reaction is 15000 kg / h, the feed rate of the fluorine gas is 1.5g / per 1kgHF, and 70kg / h is drawn from the high boiling rectification tower still h, the material enters into V-5100, and other conditions are the same as in Example 1.

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Abstract

The invention relates to the technical field of purification of anhydrous hydrogen fluoride, in particular to a purification process for high-purity anhydrous hydrogen fluoride. The purification process comprises the following steps: 1, pre-condensation of raw materials; 2, preparation of fluorine by electrolysis; 3, oxidization with fluorine gas; 4, removal of light components; 5, preliminary separation; 6, a circular reaction; 6, a circular reaction; 7, rectification separation; and 8, storage of a finished product. The process has the beneficial effects that by arranging continuous purification equipment, technological process is simple, equipment is few, production cost is low, the purpose of continuous production can be achieved, large-batch production is convenient to achieve, and production and purification efficiency is greatly improved; by arranging separation processes such as electrolysis, the circular reaction and rectification, product separation precision is greatly improved, product purity is greatly improved on the premise of reducing introduced new impurities, and product quality is improved.

Description

technical field [0001] The invention relates to the technical field of anhydrous hydrogen fluoride purification, in particular to a high-purity anhydrous hydrogen fluoride purification process. Background technique [0002] At present, the products obtained from the production of anhydrous hydrogen fluoride from fluosilicic acid all have high impurity content. There are some research reports on the removal of impurities, but there are few cases of industrial removal. [0003] The purity of industrial-grade anhydrous HF is as high as 99.95% or higher, but it contains anion and cation impurities formed by silicon, phosphorus, nitrogen, chlorine, sulfur, arsenic, boron, and metal elements. In the electronics industry for integrated circuit preparation, the photovoltaic industry, and the chemical industry for the synthesis of fluorocarbons, the requirements for these impurities are very high, and the content is required to be at the 10-9 level (ppb) (one part per billion), espec...

Claims

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Application Information

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IPC IPC(8): C01B7/19
CPCC01B7/195C01B7/196C01P2006/80C01P2006/82
Inventor 严江有孟文祥燕如勇兰桥海陈梅净
Owner 福建瓮福蓝天氟化工有限公司
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