A method for extracting aromatic compounds using hydroxyl functionalized ionic liquid

Abstract

The invention relates to a method for extracting an aromatic compound by using hydroxyl-functionalized ionic liquid. The method is characterized in that the hydroxyl-functionalized ionic liquid shownas a formula (I) or (II) is taken as an extracting agent, and the aromatic compound is extracted from an aqueous solution of the aromatic compound, (the formula is shown in the description), wherein nis an integer of 1 to 10, R1 is hydrogen, hydroxy or alkyl of C1 to C6, R2 is hydroxy or alkyl of C1 to C6, and X is hexafluorophosphate or bis(trifluoromethanesulphonyl) amine. The aromatic compoundcan be effectively extracted from the aqueous solution by using the extracting agent. The hydroxyl-containing hydrophobic ionic liquid provided by the invention has the advantages of low viscosity, good stability and the like; the aromatic compound can be quickly and efficiently extracted from the water; the extracting agent can be recycled; the aromatic compound also can realize resource recycling and is suitable for large-scale wastewater treatment.

Description

technical field [0001] The invention belongs to the field of chemical technology, and in particular relates to a method for extracting aromatic compounds from water by using a hydrophobic ionic liquid containing a hydroxyl functional group as an extractant. Background technique [0002] Aromatic compounds refer to organic compounds containing benzene rings in their molecules, mainly including aromatic hydrocarbons and their derivatives, such as halogenated aromatic hydrocarbons, aromatic nitro compounds, phenols, amines, etc. Aromatic compounds are currently widely used as solvents or chemical raw materials in many fields such as pesticides, dyes, and medicine, and play an important role in chemical production. However, aromatic compounds are usually highly toxic, carcinogenic, and mutagenic, and once they enter the environment, they will pose a great threat to human health and ecosystems. To this end, countries have set strict standards for their discharge. According to th...

AI Technical Summary

Problems solved by technology

[0005] The use of ionic liquids as extraction agents can make good use of its low vapor pressure and avoid the use of volatile organic solvents. However, the extraction efficiency of conventional ionic liquids for aromatic compounds containing hydrophilic groups is not high, and cannot meet the needs of large-scale extraction. The need to purify wastewater, or the need to add organic solvents as dispersants, thus introducing "secondary pollution" to the system

Images