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Preparation method of sulfur hexafluoride

A technology of sulfur hexafluoride and sulfur hexafluoride gas, applied in the direction of sulfur and halogen compounds, can solve the problems of energy consumption, increase purification, and many processes, and achieve the effect of saving purification process, increasing output and reducing pollution

Active Publication Date: 2014-06-11
FUJIAN YONGJING TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This process has the following disadvantages: the selected raw materials contain many impurities, and the crude sulfur hexafluoride produced requires two-stage rectification, which requires many procedures and consumes energy; Tubes and fluorine gas are used as raw materials to participate in the reaction, which will reduce the purity of the sulfur hexafluoride product produced next and increase the difficulty of purification; the purity of the sulfur hexafluoride product obtained after two-stage rectification is not high; no Disposal methods of tail gas and unqualified products

Method used

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  • Preparation method of sulfur hexafluoride
  • Preparation method of sulfur hexafluoride
  • Preparation method of sulfur hexafluoride

Examples

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Effect test

Embodiment 1

[0039] 1) Reaction

[0040] React fluorine gas and gaseous sulfur in a reactor to produce crude sulfur hexafluoride gas, wherein the fluorine gas is electrolyzed by a medium-temperature method using potassium bifluoride molten salt as the electrolyte and anhydrous hydrogen fluoride as the raw material The weight ratio of the fluorine gas to the gaseous sulfur is 1.05:1, the reaction temperature is 150°C, and the reaction pressure is -100Pa.

[0041] 2) Pyrolysis

[0042] Pass the generated crude sulfur hexafluoride gas into the pyrolysis tower, and pyrolyze to remove the S 2 f 10 , S 2 f 10 O poisonous gas. Wherein, the temperature of the pyrolysis tower is 380°C, and the pressure is -150Pa.

[0043] 3) washing

[0044] Pass the pyrolyzed crude sulfur hexafluoride gas into the water washing tower to hydrolyze the hydrolyzable impurities, and then pass the crude sulfur hexafluoride gas into the alkali washing tower to remove the acidity in the crude sulfur hexafluoride g...

Embodiment 2

[0054] 1) Reaction

[0055] The fluorine gas and the gaseous sulfur react in the reactor to generate crude sulfur hexafluoride gas. Wherein, the fluorine gas is produced by medium-temperature electrolysis with potassium bifluoride molten salt as the electrolyte and anhydrous hydrogen fluoride as the raw material, the weight ratio of the fluorine gas to the gaseous sulfur is 1.03:1, and the reaction temperature The temperature is 180°C, and the reaction pressure is -50Pa.

[0056] 2) Pyrolysis

[0057] Pass the generated crude sulfur hexafluoride gas into the pyrolysis tower to remove S 2 f 10 , S 2 f 10 O poisonous gas. Wherein, the temperature of the pyrolysis tower is 420°C, and the pressure is -200Pa.

[0058] 3) washing

[0059] Pass the pyrolyzed crude sulfur hexafluoride gas through the water washing tower to hydrolyze the hydrolyzable impurities, and then pass it into the alkali washing tower to neutralize and remove the acidic impurities in the crude sulfur hex...

Embodiment 3

[0069] 1) Reaction

[0070] Fluorine gas is reacted with gaseous sulfur in a reactor to produce crude sulfur hexafluoride gas. Wherein, the fluorine gas is produced by medium-temperature electrolysis with potassium bifluoride molten salt as the electrolyte and anhydrous hydrogen fluoride as the raw material. The weight ratio of the fluorine gas to the gaseous sulfur is 1.04:1, and the reaction temperature The temperature is 160°C, and the reaction pressure is -60Pa.

[0071] 2) Pyrolysis

[0072] Pass the generated crude sulfur hexafluoride gas into the pyrolysis tower to remove S 2 f 10 , S 2 f 10 O poisonous gas. Wherein, the temperature of the pyrolysis tower is 390°C, and the pressure is -160Pa.

[0073] 3) washing

[0074] Pass the pyrolyzed crude sulfur hexafluoride gas into the water washing tower to hydrolyze the hydrolyzable impurities, and then pass it into the alkali washing tower to neutralize and remove the acidic impurities in the crude sulfur hexafluorid...

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Abstract

The invention discloses a preparation method of sulfur hexafluoride. The preparation method comprises the following steps: reacting fluorine gas with gaseous sulfur to generate crude sulfur hexafluoride gas; carrying out pyrolysis, washing, water removal, acid removal and rectification treatment on the crude sulfur hexafluoride gas to obtain sulfur hexafluoride products; detecting the products; conducting correlative treatment on unqualified sulfur hexafluoride products until qualified products are obtained; and recycling the tail gas separated from rectification treatment. The method provided by the invention adopts fluorine gas prepared by an electrolytic method and high-quality sulfur as raw materials for reaction, and the generated crude sulfur hexafluoride gas contains less impurities, so as to save a purification process and reduce the energy consumption; indexes of the prepared sulfur hexafluoride are better than those of the national standard GB / T 18867-2002 Gas for electronic industry-sulfur hexafluoride; the tail gas is recovered to reduce pollution and increase yield; and unqualified products under different conditions are controlled.

Description

technical field [0001] The invention belongs to the field of chemical production, in particular to a preparation method of sulfur hexafluoride. Background technique [0002] Sulfur hexafluoride is a colorless, odorless, non-toxic, non-corrosive, non-flammable, non-explosive gas at normal temperature and pressure, with a molecular weight of 146.06 and a density of 6.139g / L, about five times that of air. Its chemical composition is stable, and it is one of the gaseous substances with the best known chemical stability, and its inertness is similar to that of nitrogen. It has excellent thermal stability, and it does not decompose even at high temperatures above 500°C in its pure state. Sulfur hexafluoride has excellent electrical insulation and arc extinguishing properties. Under normal pressure, its insulation capacity is more than 2.5 times that of air, and its arc extinguishing capacity is equivalent to 100 times that of air under the same conditions. Also, under the same c...

Claims

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Application Information

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IPC IPC(8): C01B17/45
Inventor 罗建文徐道斌
Owner FUJIAN YONGJING TECH CO LTD
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