Quiescent interface extraction tank, quiescent interface extraction device and extraction method

Abstract

The invention relates to the technical field of extraction kinetics, and discloses a quiescent interface extraction tank, a quiescent interface extraction device and an extraction method. The quiescent interface extraction tank comprises a tank body, a tank cover and a phase interface ring; the tank body comprises a jacket layer, and a light-phase liquid tank and a heavy-phase liquid tank which are sequentially connected from top to bottom, the upper end of the light-phase liquid tank is open, the bottom end of the heavy-phase liquid tank is gradually shrunk and extends downwards to be closed,the jacket layer is arranged at the peripheries of the light-phase liquid tank and the heavy-phase liquid tank, a sealed accommodating space is formed between the jacket layer and the light-phase liquid tank wall and the heavy-phase liquid tank wall, a quiescent-temperature water inlet is formed at the lower end of one side of the jacket layer, and a quiescent-temperature water outlet is formed at the upper end of the other side of the jacket layer; and the tank cover is detachably connected with the upper end of the light-phase liquid tank, and the phase interface ring is mounted in the tankbody and is located at the junction of the light-phase liquid tank and the heavy-phase liquid tank. The quiescent interface extraction tank has the advantages of good sealing performance, controllable temperature, and convenience in phase interface ring replacement and sampling.

Description

technical field [0001] The invention relates to the technical field of extraction kinetics, in particular to a constant interface extraction pool, device and extraction method. Background technique [0002] Extraction is a very important separation process, which has a wide range of industrial applications in coal chemical industry, petroleum refining, organic chemistry, metallurgy, food and other industries. The essence of the extraction process is the mass transfer kinetics of the extraction process between two phases. The study of extraction kinetics usually adopts the control variable method, only one of the variables such as stirring rate, temperature, phase boundary area, concentration, and phase ratio is changed, and the other variables are kept constant, and the two-phase liquid is extracted at a certain time interval to determine the composition. Obtain kinetic study data. The instrument used in the above research method is a constant interface extraction device, ...

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Problems solved by technology

Chinese utility model patent: laminar flow type constant interface pool, application number: CN 94220491.3 The rectangular constant interface extraction pool disclosed in CN 94220491.3 is prone to dead volume during stirring, resulting in uneven concentration distribution in the phase, and it is difficult to seal the entrance and exit of light and heavy two-phase liquids. It is easy to leak or volatilize during the process, resulting in the loss of experimental samples, and there is no measure to control the constant extraction temperature

The unreasonable design of the phase interface plate makes it difficult to keep the phase interface constant due to the interference of fluid flow during the actual experiment, and it is difficult to carry out continuous sampling during the experiment, and the sampling operation is easy to cause light and heavy mutual contamination

Chinese invention patent application: constant interface extraction tank, application number CN200810175853.3 Although a constant temperature jacket is designed to control the temperature and a liquid tank cover is added to strengthen the sealing of the system, but due to the blocking of the upper stirring paddle, the lower layer cannot be extracted during the experiment Determination of the composition of heavy-phase liquid samples will lead to an extraction process with very low effective content in some light-phase liquids. It is difficult to obtain accurate kinetic data only by taking the composition of the upper liquid, and the relative error of the experiment is relatively large.

In addition, the interface retaining ring is fixed to the tank body, and the central baffle is fixed to the stirring shaft. To change the phase boundary area, the shaft and paddle need to be replaced, which is too cumbersome.

Chinese invention patent application: Cylindrical constant interface extraction tank, application number CN201510202182.5 mentions the scheme of changing the contact area of ​​the two-phase interface by overlapping and rotating two semicircular baffles. In actual situations, due to the baffles There is actually a thickness, and it is impossible to exist on the same horizontal plane when overlapping, so it is impossible to really effectively control the contact area of ​​the two phases. The two stirring paddles in different positions are likely to cause instability of the phase interface during stirring and sampling, and from the sampling port. When directly extracting the lower heavy phase sample, the sampler will first enter the light phase liquid, which will cause pollution to the lower middle phase liquid and increase the experimental error

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