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A kind of preparation method of modified ionic liquid catalyst for removing sulfur dioxide

A technology for modifying ions and sulfur dioxide, which is used in the preparation/purification of sulfur, catalysts for physical/chemical processes, chemical instruments and methods, etc., and can solve the problem that sulfur process methods have not been reported, have not utilized sulfur resources, and have not solved sulfur resources. To achieve the effect of promoting gas-liquid mass transfer capacity, short preparation time and strong selectivity

Active Publication Date: 2019-02-19
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The catalyst has high desulfurization efficiency, but it is only used for SO in flue gas 2 Oxidative removal, and did not utilize the sulfur resources
Chinese patent CN 104399364A discloses the invention of "a method for absorbing sulfur dioxide by a nitro-containing ionic liquid". The invention introduces a nitro group into the anion of a functionalized ionic liquid, and utilizes the effect of the anion-enhanced nitro group and sulfur dioxide to absorb Improve the absorption of sulfur dioxide and have high-efficiency reversible absorption performance, but it does not solve the problem of sulfur resource utilization
The catalyst has high absorption performance, but only for SO 2 Absorption and capture
[0003] At present, regarding the use of modified ionic liquid catalysts to remove SO 2 And the processing method of generating sulfur has not been seen in the report

Method used

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  • A kind of preparation method of modified ionic liquid catalyst for removing sulfur dioxide
  • A kind of preparation method of modified ionic liquid catalyst for removing sulfur dioxide
  • A kind of preparation method of modified ionic liquid catalyst for removing sulfur dioxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Weigh 50 g of citric acid into a beaker, add 50 mL of deionized water to make a citric acid solution with a mass fraction of 50%, and stir and mix at 60 °C for 1 h. Under the condition of stirring, slowly drop 48mL MDEA (the mass ratio of MDEA to citric acid is 1:1) into the citric acid solution, and stir and mix at 60°C for 1h. Add 16.7mL of water to the beaker and continue stirring at 60°C for 8h. Add ammonia water dropwise and stir to adjust the pH of the ionic liquid to 7.5. A solution made of 5 g of hydroxylamine hydrochloride was added dropwise and stirred for 1 h for preliminary modification. Then add 5 g of sodium thiosulfate and stir for 1 h to carry out further modification to obtain a modified ionic liquid catalyst.

[0031] The activity test of the catalyst was carried out in a 250mL three-necked flask reactor, and the reaction conditions were: SO 2 The concentration is 1000ppm, the gas flow rate is 500mL / min, the volume of ionic liquid is 100mL, the reac...

Embodiment 2

[0033] Weigh 50 g of citric acid into a beaker, add 50 mL of deionized water to make a citric acid solution with a mass fraction of 50%, and stir and mix at 50 °C for 1 h. Under the condition of stirring, slowly drop 72mL MDEA (the mass ratio of MDEA to citric acid is 1.5:1) into the citric acid solution, and stir and mix at 50°C for 1h. Add 33.3mL of water to the beaker, and continue to stir at 50°C for 8h. Add ammonia water dropwise and stir to adjust the pH of the ionic liquid to 7.5. A solution made of 12.5 g of hydroxylamine hydrochloride was added dropwise and stirred for 1 h for preliminary modification. Then add 12.5 g of sodium thiosulfate and stir for 1 h to carry out further modification to obtain a modified ionic liquid catalyst.

[0034] The activity test of the catalyst was carried out in a 250mL three-necked flask reactor, and the reaction conditions were: SO 2 The concentration is 1000ppm, the gas flow rate is 500mL / min, the volume of ionic liquid is 100mL, ...

Embodiment 3

[0036] Weigh 40 g of citric acid into a beaker, add 60 mL of deionized water to make a citric acid solution with a mass fraction of 40%, and stir and mix at 70 °C for 1 h. Under the condition of stirring, slowly drop 69mL MDEA (the mass ratio of MDEA to citric acid is 1.8:1) into the citric acid solution, and stir and mix at 70°C for 1h. Add 14.7mL of water to the beaker and continue stirring at 70°C for 8h. Add ammonia water dropwise and stir to adjust the pH of the ionic liquid to 7.2. A solution made of 16.8 g of ferrous sulfate was added dropwise and stirred for 1 h for preliminary modification. Then add 16.8 g of sodium thiosulfate and stir for 1 h to carry out further modification to obtain a modified ionic liquid catalyst.

[0037] The activity test of the catalyst was carried out in a 250mL three-necked flask reactor, and the reaction conditions were: SO 2 The concentration is 1000ppm, the gas flow rate is 500mL / min, the volume of ionic liquid is 100mL, the reaction t...

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Abstract

The invention discloses a preparation method of a modified ionic liquid catalyst used for removing sulfur dioxide. MDEA (methyl diethanol amine) and citric acid serving as raw materials are mixed in a certain proportion, ammonium hydroxide is dropwise added until an ionic liquid is adjusted to be slightly alkaline, a reducing agent I and a reducing agent II are sequentially added, and the modified ionic liquid catalyst is prepared. The catalyst is used for removing sulfur dioxide, the process is simple, operation is convenient, continuous running can be realized, sulfur can be obtained from sulfur dioxide in flue gas through a catalytic reduction reaction in the purification process, S in SO2 is removed and recycled through circular desorption with the ionic liquid, and no secondary pollution is caused.

Description

technical field [0001] The invention relates to a preparation method of a modified ionic liquid catalyst for removing sulfur dioxide, belonging to the field of air pollution control. Specifically, it is an ionic liquid made of N-methyldiethanolamine as a cation and citric acid as an anion. It is modified by adding a reduced salt to the ionic liquid to remove modified ions from sulfur dioxide to generate sulfur. Preparation method of liquid catalyst. Background technique [0002] The massive consumption of coal in my country produces more than 20 million tons / year of SO 2 exhaust gas. SO 2 It is the most important component of acid rain, which not only causes relatively large direct economic losses (accounting for about 3% of GDP), but also destroys the ecological environment and endangers human health. cut SO 2 Emissions and improving the environment have become important issues to be solved urgently. Flue gas desulfurization technologies mainly include limestone / gypsu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J31/02B01J31/26B01J31/28C01B17/02
CPCB01J31/0285B01J31/26B01J31/28B01J2231/62C01B17/0253
Inventor 李凯乔雨腾宁平孙鑫汤立红王驰宋辛
Owner KUNMING UNIV OF SCI & TECH
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