Method for producing and purifying sulfur hexafluoride
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A technology of sulfur hexafluoride and fluorine gas, applied in the direction of sulfur and halogen compounds, etc., can solve the problem of not being able to obtain sulfur hexafluoride and so on
Inactive Publication Date: 2012-01-25
TIANJIN TAIHENG GASES
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[0005] The problem to be solved by the present invention is to overcome the deficiencies of the prior art. The prior art cannot obtain pure sulf
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Embodiment 1
[0014] Fluorine and sulfur (1:1) reaction This process is composed of reaction synthesis, pyrolysis, alkali washing, adsorption, rectification, vaporization and impurity circulation treatment and other units. First, fluorine gas and molten sulfur react in reactor 3 to synthesize crude sulfur hexafluoride; then, the crude sulfur hexafluoride passes through pyrolysis tower 4 at 400°C to decompose S2F10 and S2F10O at high temperature; the third step is to pass through washing tower 5 , to remove acidic and hydrolyzable impurities such as HF, SF4, etc.; the fourth step, enter the adsorption drying tower 6 to remove water and some low-fluorine sulfur compounds; the fifth step, use two-stage pressurized rectification towers 8 and 9 to remove light Component impurities CF4, THC, O2, N2 and heavy impurities SO2F2, CO2, N2O, ClO3F, SF5OCF3, etc., get the sulfur hexafluoride product that reaches the purity requirement of at least 99.8% content from the top of the secondary rectification ...
Embodiment 2
[0016] Fluorine and sulfur reaction (1:0.5) This process is composed of reaction synthesis, pyrolysis, alkali washing, adsorption, rectification, vaporization and impurity circulation treatment and other units. First, fluorine gas and molten sulfur react in reactor 3 to synthesize crude sulfur hexafluoride; then, the crude sulfur hexafluoride passes through pyrolysis tower 4 at 400°C to decompose S2F10 and S2F10O at high temperature; the third step is to pass through washing tower 5 , to remove acidic and hydrolyzable impurities such as HF, SF4, etc.; the fourth step, enter the adsorption drying tower 6 to remove water and some low-fluorine sulfur compounds; the fifth step, use two-stage pressurized rectification towers 8 and 9 to remove light Component impurities CF4, THC, O2, N2 and heavy impurities SO2F2, CO2, N2O, ClO3F, SF5OCF3, etc., get the sulfur hexafluoride product that reaches the purity requirement of at least 99.8% content from the top of the secondary rectificatio...
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Abstract
The invention discloses a method for producing and purifying sulfur hexafluoride. The flow comprises units such as reactive synthesis, pyrolysis, alkaline wash, adsorption, rectification, gasification, impurity circulating treatment and the like. The method comprises the following steps of: 1, reacting fluorine with melted sulfur in a reactor 3 to synthesize a coarse product of sulfur hexafluoride; 2, allowing the coarse product of the sulfur hexafluoride to pass through a pyrolysis tower 4 at the temperature of 400 DEG C to be decomposed into S2F10 and S2F10O at high temperature; 3, introducing into a washing tower 5 to remove acidic and hydrolyzable impurities such as HF, SF4 and the like; 4, intruding into an adsorption drying tower 6 to remove water and part of low-fluorine sulfur compounds; 5, removing light-component impurities such as CF4, THC, O2 and N2 and heavy impurities by using two levels of pressing rectification towers 8 and 9 to obtain the sulfur hexafluoride product with the content of at least 99.8 percent and meeting the purity requirement from the top of the second-level rectification tower; and 6, allowing the sulfur hexafluoride product to pass through a heat treater at the temperature of between 500 and 600 DEG C or directly returning the sulfur hexafluoride product to a fluorine charging pipe, so that the sulfur hexafluoride product and the fluorine serve as raw materials to enter a synthetic reactor to take part in the reaction. The method is the most simple, convenient and ideal technology for preparing the sulfur hexafluoride.
Description
technical field [0001] The invention relates to a chemical product, in particular to a method for producing and purifying sulfur hexafluoride, which is suitable for producing sulfur hexafluoride. Background technique [0002] This product is one of the 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 temperatures above 500°C in its pure state. Sulfur hexafluoride has excellent electrical insulation and arc extinguishing properties. Under the same conditions, its insulation capacity is more than 2.5 times that of air and nitrogen, and its arc extinguishing capacity is 100 times that of air. The melting point of sulfur hexafluoride is -50.8°C, it can be used as a special refrigerant in the temperature range of -45~0°C, and because of its good heat resistance, it is a stable high-temperature heat carrier. Due to the above and other excellent properties, su...
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