Microfluidic chip with oil-water demulsification and separation under electric field/interface synergistic effect and preparation method thereof

Abstract

The invention relates to a microfluidic chip with oil-water demulsification and separation under an electric field / interface synergistic effect and a preparation method thereof. Microstructures and microchannels are arranged on the surface of the microfluidic chip; the hydrophilic modification and the oleophylic modification are implemented on the left sides and the right sides of the microchannels respectively; under the driving of an external peristaltic pump, oil-water mixed solution enters a demulsification area which is provided with microstructures on the surface; the demulsification is implemented for the oil-water mixed solution under the electric field effect; water moves to the hydrophilic sides; oil moves to the oleophylic sides; the oil-water mixture not totally separated from each other is circulated to an original feeding area for implementing the secondary demulsification and separation; and finally, the oil-water separation is achieved. The microfluidic chip is mainly applied in the related fields, such as oil of transformers, turbine oil of power stations, treatment of sea crude oil leakage accidents, failed oil of oil fields, floating oil of sea drilling well platforms, advection oil of steelworks, a large amount of oil-containing waste water of refineries and the like. The microfluidic chip realizes quick demulsification and quick separation of the oil-water mixed solution, has the characteristics of portability, economy, quickness and high efficiency, and provides a brand new analysis technology for the oil-water separation field.

Description

technical field [0001] The invention relates to a microfluidic chip for demulsification and separation of oil and water under the synergistic effect of an electric field / interface and a preparation method thereof. The surface of the microfluidic chip has microstructures and microchannels, and the left and right sides of the microchannel are respectively hydrophilic and hydrophilic Oil modification, driven by the external peristaltic pump, the oil-water mixed solution enters the demulsification area with microstructure on the surface. Under the action of the electric field, the oil-water mixed solution undergoes demulsification, water moves to the hydrophilic side, and oil moves to the lipophilic side , the oil-water mixture that has not been separated is circulated to the initial sampling area, and then demulsified and separated again, and finally the oil-water separation is realized. It is mainly used in transformer oil, turbine oil in power plants, offshore crude oil spill ac...

AI Technical Summary

Problems solved by technology

It has two major hazards. First, a large amount of grease and residues are easily adhered to the wall of the sewer pipe. Over time, the actual flow area of ​​the pipe becomes smaller and smaller, and finally forms a blockage. It is reported that there are hundreds of cases in Suzhou every day due to The pipe blockage caused by grease needs to be dredged, and its economic loss reaches hundreds of thousands of yuan

Second: A large amount of oil enters the sewage treatment plant through the pipe network, causing a large number of biological bacteria that are very sensitive to oil to deteriorate and die, resulting in a significant decline in the quality of the effluent and pollution of the discharged water.

[0004] In summary, although there are many treatment methods for oily wastewater, each method has its limitations.

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