Iron-based imidazole ion liquid for removing SO2 from smoke and preparation method of iron-based imidazole ion liquid

Abstract

The invention discloses iron-based imidazole ion liquid for removing SO2 from smoke and a preparation method of the iron-based imidazole ion liquid. Anions of the ion liquid are combined with hydrogen on imidazole rings in the form of FeCl4-. The method includes the steps of putting 40 ml or 41.44 g of N-methylimidazole and 63 ml or 56.07 g of n-chlorobutane in a 250-ml pear-shaped bottle to be mixed according to the molar ratio of 1 to 1.2, conducting water bath ultrasonic auxiliary backflow heating at the temperature of 70 DEG C for 6 h, conducting liquid separation through a liquid separation hopper to obtain lower layer liquid, conducting washing three times through ethyl acetate of equal volumes to remove unreacted raw materials, conducting drying for 7 h to remove residual ethyl acetate and obtain a product [Bmim]Cl, adding ferric chloride to be stirred for 20 h under the magnetic force, conducting centrifuging to obtain upper layer liquid, conducting washing three times through distilled water to remove unreacted reactant, and conducting drying for 10 h to obtain the iron-based imidazole ion liquid. The iron-based imidazole ion liquid is short in preparation cycle, high in yield and simple in reaction by-product removal.

Description

technical field [0001] The invention belongs to the technical field of chemical engineering and environmental protection, in particular to a method for removing SO in flue gas 2 Iron-based imidazole ionic liquid and preparation method thereof. Background technique [0002] Room temperature ionic liquids (RTIL), referred to as ionic liquids (IL), are ionic compounds that are composed of specific cations and anions and are liquid at or near room temperature. Ionic liquids contain only cations and anions, and do not contain neutral molecules. This special structure makes ionic liquids show special properties. Ionic liquid, as an emerging green material, has attracted much attention, and has become a research hotspot for scientists all over the world. Because of the unique structure of ionic liquids, it has many unique properties that cannot be compared with general solvents: (1) low vapor pressure, difficult to volatilize, stable properties, can be applied in high vacuum sys...

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Problems solved by technology

[0004] The object of the present invention is to provide a method for removing SO in flue gas 2 The iron-based imidazole ionic liquid and its preparation method aim to solve the traditional ionic liquid heating and reflux preparation method, which has long preparation period, low yield, difficult removal of reaction by-products, and requires a large amount of organic solvents to increase product costs. It is economical and not environmentally friendly, which prevents the large-scale production and industrial application of ionic liquids

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