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Application of elementary-substance selenium as catalyzer

A technology of elemental selenium and catalyst, applied in the direction of sulfur preparation/purification, sulfate/bisulfate preparation, etc., can solve the problems of high reaction temperature for sulfur production, long process flow, environmental pollution, etc., and achieve high product quality and process The process is simple and the effect of not polluting the environment

Active Publication Date: 2013-01-09
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chinese patent ZL200910058717.0 reports a low-temperature Claus sulfur recovery process and device, but the low temperature referred to in this process is above 100°C, and hydrogen sulfide and sulfur dioxide are used to react at the same time. 2 If S runs out, it will cause pollution
Chinese patent ZL200710035059.4 proposes a method of absorbing SO using sodium sulfide 2 The method for preparing sulfur has a long process flow and high cost, and there will be H in the absorption process. 2 S is produced, causing environmental pollution. At the same time, the reaction temperature for sulfur production is as high as 120-240°C

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Chemically pure anhydrous sodium bisulfite, its main components are: NaHSO 3 >99.0%; water is first-grade deionized water; chemically pure elemental selenium powder, its main component is: Se>99.0%.

[0022] In a four-neck flask equipped with a sealing plug, a magnetic stirrer, a thermometer, and a high-temperature pH meter, add 1.84 g of elemental selenium powder and 0.3 mol of sodium bisulfite solution at a molar ratio of 1:12 to adjust the pH to 3.44. Use a magnetic stirring water bath, raise the temperature to 80°C, and continue the reaction for about 150 minutes, at which time sulfur colloid appears. Filter the elemental selenium powder and the solution, dry the elemental selenium powder at 80°C until the constant weight is 1.80g, and the loss rate is 2.17%, and continue to react for about 150min until the reaction is complete. The solution was cooled to 30°C with water, and a 0.25um mixed membrane was used for suction filtration to separate the elemental sulfur s...

Embodiment 2

[0024] Chemically pure anhydrous potassium bisulfite, its main component is: KHSO 3 >99.0%; water is first-grade deionized water; chemically pure elemental selenium powder, its main component is: Se>99.0%.

[0025] In a four-neck flask equipped with a sealing plug, a magnetic stirrer, a thermometer, and a high-temperature pH meter, add 0.064 g of elemental selenium powder and 0.3 mol of potassium bisulfite solution at a molar ratio of 1:370 to adjust the pH to 3.58. Using a magnetic stirring water bath, the temperature was raised to 100°C, and the reaction was continued for about 299 minutes. At this time, sulfur colloid appeared. Filter the elemental selenium powder and the solution, dry the elemental selenium powder at 80°C until the constant weight is 0.0625g, and the loss rate is 2.23%, and continue to react for about 150min until the reaction is complete. The solution was cooled to 30°C with water, and a 0.25um mixed membrane was used for suction filtration to separate t...

Embodiment 3

[0027] Chemically pure anhydrous ammonium bisulfite, its main components are: NH 4 HSO 3 >99.0%; water is first-grade deionized water; chemically pure elemental selenium powder, its main component is: Se>99.0%.

[0028] In a four-necked flask equipped with a sealing plug, a magnetic stirring bar, a thermometer and a high-temperature pH meter, add 0.014 g of elemental selenium powder and 0.3 mol of ammonium bisulfite solution at a molar ratio of 1:1700 to adjust the pH to 3.82. Using a magnetic stirring water bath, the temperature was raised to 100°C, and the reaction was continued for about 580 minutes. At this time, sulfur colloid appeared. Filter the elemental selenium powder and the solution, dry the elemental selenium powder at 80°C until the constant weight is 0.0135g, and the loss rate is 3.57%, and continue to react for about 150min until the reaction is complete. The solution was cooled to 30°C with water, and a 0.25um mixed membrane was used for suction filtration t...

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Abstract

The invention relates to an application of elementary-substance selenium as a catalyzer, and particularly, the elementary-substance selenium is applied in catalytic reaction of sulfite to prepare elementary-substance sulfur. According to the application of the elementary-substance selenium as the catalyzer, the elementary-substance selenium is applied as the catalyzer to prepare the high-purity elementary-substance sulfur, limits of high-temperature and high-pressure environments required by the elementary-substance sulfur preparation in traditional modes are broken; the catalyzer is stable in structure performance, can be recycled and used repeatedly; and the technology and the equipment are simple, the production cost is low, and the catalyzer is free of environmental pollution.

Description

technical field [0001] The invention relates to the use of elemental selenium as a catalyst for catalyzing sulfite reaction to prepare elemental sulfur. Background technique [0002] Selenium, the 34th non-metal element of the oxygen group, is chemically similar to sulfur and tellurium. Because selenium has good photoelectric properties, it is widely used in electronic components such as batteries and copiers; selenium is also an essential trace element for human and animal life activities, and adding selenium to some medicines will have a significant effect; at the same time, selenium and Its compounds can be used as catalysts in many ways. Chinese patent ZL201110246100.9 introduces the use of selenium-containing organic composite catalysts for liquid-phase cyclochlorination; Chinese patent 201110319616.1 introduces a method for the synthesis of 1,2-cyclohexanediol from cyclohexene catalyzed by selenium compounds; Most of the research is on carbonylation reactions, such a...

Claims

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Application Information

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IPC IPC(8): C01B17/06C01D5/04
Inventor 柴立元刘恢杨本涛彭兵闵小波杨志辉
Owner CENT SOUTH UNIV
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