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Large phase ratio liquid-liquid two-phase continuous extraction apparatus

An extraction device and liquid membrane technology, applied in the field of liquid-liquid solvent extraction and separation, can solve problems such as difficult operation, inability to distinguish light and heavy phases with self-priming agitators, and reduced processing capacity.

Active Publication Date: 2012-06-27
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although reducing the size of the agitator can meet the needs of small-volume liquid dispersion, the mismatch between the size of the tower body cavity and the size of the small agitator becomes more prominent. Reducing the size of the tower body cavity will only lead to a further increase in the processing capacity. decrease
In addition, for a very small volume of liquid to be dispersed, the self-priming agitator cannot distinguish between light and heavy phases, and often the two phases are lifted together, making it difficult to effectively control subsequent operations

Method used

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  • Large phase ratio liquid-liquid two-phase continuous extraction apparatus
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  • Large phase ratio liquid-liquid two-phase continuous extraction apparatus

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Effect test

Embodiment 1

[0067] The organic phase is di-(2-ethylhexyl) phosphoric acid (P204), which is dissolved in sulfonated kerosene, and the concentration of P204 in kerosene is 1mol / L. The water phase is an aqueous solution of heavy rare earth metal ions erbium, ytterbium and lutetium, with a pH of 4-4.5 and a total concentration of rare earth metal ions of 10 mg / L. The volume of the organic phase is 10 mL, the volume of the aqueous phase to be extracted is 5 L, and the water:oil ratio is 500:1. The inner diameter of the cavity of the tower body is 50mm, and the height is 2000mm. Three sets of liquid film dispersers and bubble collecting covers are installed in the tower body, and the distance between each set is 500mm. The channel diameter of the standpipe of the liquid film disperser is 1mm, and the length of the standpipe is 5mm. The organic phase is pumped into the interlayer gap of the interlayer liquid film distributor 11 at the bottom of the tower by a diaphragm metering pump. The air p...

Embodiment 2

[0069] The organic phase is 15wt% naphthenic acid+10wt% mixed alcohol+75wt% sulfonated kerosene. The water phase is a mixed aqueous solution of yttrium, lanthanum, europium and gadolinium ions, with a pH of 4-4.5 and a total concentration of rare earth metal ions of 100 mg / L. The volume of the organic phase is 100 mL, the volume of the aqueous phase to be extracted is 100 L, and the water:oil ratio is 1000:1. The inner diameter of the cavity of the tower body is 50mm, and the height is 2000mm. Three sets of liquid film dispersers and bubble collecting covers are installed in the tower body, and the distance between each set is 500mm. The channel diameter of the standpipe of the liquid film disperser is 1.5 mm, and the length of the standpipe is 10 mm. The organic phase is pumped into the interlayer gap of the interlayer liquid film distributor 11 at the bottom of the tower by a diaphragm metering pump. The air pressure of the air cylinder connected to the tower bottom pressu...

Embodiment 3

[0071] The organic phase is partially hydrogenated monoisooctyl phosphonate (P507), which is dissolved in sulfonated kerosene, and the concentration of P507 in kerosene is 1.5mol / L. The water phase is a mixed aqueous solution of lanthanum, europium and ytterbium ions, with a pH of 4-4.5 and a total concentration of rare earth metal ions of 100mg / L. The volume of the organic phase is 100 mL, the volume of the aqueous phase to be extracted is 10 L, and the water:oil ratio is 100:1. The inner diameter of the cavity of the tower body is 50mm, and the height is 2000mm. Three sets of liquid film dispersers and bubble collecting covers are installed in the tower body, and the distance between each set is 500mm. The channel diameter of the standpipe of the liquid film disperser is 1mm, and the length of the standpipe is 10mm. The organic phase is pumped into the interlayer gap of the interlayer liquid film distributor 11 at the bottom of the tower by a diaphragm metering pump. The a...

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Abstract

A large phase ratio liquid-liquid two-phase continuous extraction apparatus belongs to the field of liquid-liquid extraction and separation. The apparatus contains a tower body, a gas buffer chamber, a liquid film aggregation device, liquid film dispersers, a liquid film distributor, an air-pressure chamber and the like. The liquid film dispersers and the liquid film distributor can be combined together to realize dispersion of small-volume organic phase by the use of tiny bubbles, thus solving the problem that it is not easy to fully disperse small-volume organic phase by a traditional stirring mode. The phase ratio of a light phase to a heavy phase flowing upstream in the tower body can be adjusted by the interlayer gap of the liquid film distributor. The light phase and the heavy phase can be operated by counter current under the condition of super-large phase ratio. A liquid film disperser and a bubble connection cap are arranged at intervals in the tower body, so as to realize repeated coagulation and dispersion of rising bubbles and achieve high stage efficiency of height of mass transfer unit. A liquid film aggregation device on the top of the tower can be used for bubble coagulation and demulsification and is suitable for extraction operation of an easily-emulsified system. The apparatus provided by the invention is applicable to continuous countercurrent operation under the condition of multi-stage series connection.

Description

technical field [0001] The invention belongs to the technical field of liquid-liquid solvent extraction and separation, and in particular relates to a large phase liquid-liquid two-phase continuous extraction device. Background technique [0002] Solvent extraction is an important chemical separation technology. In the traditional organic-aqueous two-phase extraction process, the selection of the volume ratio (comparison) or flow ratio (flow ratio) of the immiscible oil and water phases often determines which phase is used in the two-phase mixing process. dispersed phase, while the other phase acts as the continuous phase. Therefore, whether the selection of ratio (or flow ratio) is appropriate or not has an important impact on the separation index of the final target. Generally, for equipment suitable for traditional liquid-liquid two-phase extraction and separation, its structural design needs to consider not only the two-phase mass transfer process of a specific extract...

Claims

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Application Information

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IPC IPC(8): B01D11/04
Inventor 黄焜刘会洲安震涛刘德明杨良嵘
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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