Method for concentrating aniline from water solution

Abstract

The invention relates to a method for concentrating aniline from water solution, which belongs to the field of chemical concentration, and the method comprises the following steps: using 1.03% of aniline water solution at normal temperature and normal pressure, and taking a solid inorganic salt or ionic liquid as an additive, and taking methyl tertiary butyl ether as an extractant, wherein the solid inorganic salt is sodium chloride, sodium bromide, potassium carbonate or potassium acetate, the ionic liquid is 1-ethyl-3-methylimidazolium acetate, 1-ethyl-3-methylimidazolium tetrafluoroborate, 1-butyl-3-methylimidazolium acetate or 1-octyl-methylimidazolium acetate, the adding amount of the solid inorganic salt is 5%-30% (weight percentage) of the aniline water solution, the adding amount of the ionic liquid is 5%-20% (weight percentage) of the aniline water solution, and the adding amount of the extractant is 6:1 in comparison with the aniline water solution. The method can effectively enrich and concentrate low concentration aniline in water and improve the detection technology.

Description

Technical field: [0001] The invention relates to a concentration method, in particular to a method for strengthening and concentrating aniline by adding salt from an aqueous solution. Background technique: [0002] Aniline is an important organic chemical raw material, and it is also a "three harmful" substance. It is difficult to biodegrade and is highly toxic to humans and microorganisms. It has been listed as one of the priority pollutants in water. The content of such pollutants in water is very low, and it is generally difficult to reach the minimum detection limit of the instrument and is not easy to be detected directly. The sample must be pre-treated before it can be detected. [0003] The pretreatment methods of samples in water can be divided into two categories in essence: one is samples with weak response (or no signal) to the detector, whose physical and chemical properties are changed through derivation technology to make them detectable compounds . The other...

AI Technical Summary

Problems solved by technology

[0004] Liquid-liquid extraction has the characteristics of simple and convenient operation, wide application range, strong practicability, and low energy consumption. However, it consumes a large amount of organic solvent and the extraction efficiency is low.

Supercritical fluid extraction involves high-pressure operation, high technical requirements for the process, and high equipment investment costs

Solid phase extraction uses selective adsorption and selective desorption to enrich, separate, and purify samples. It is one of the most widely used purification methods at present, but its operation is relatively cumbersome, the blank value is high, and the extraction column is easy to block.

Membrane extraction has the advantages of high sensitivity, simple operation, fast and cheap, but due to the action of organic solvents, the membrane is easy to swell and the mass transfer efficiency is low

[0005] "Chinese Journal of Health Inspection", Volume 14, No. 5, October 2004, 542-544 reported a traditional MTBE liquid-liquid extraction of organic matter in water. The amount of extraction agent is large and the effect is not good.