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Three-phase solvent air-assist continuous extraction method

A phase-solvent, gas-assisted technology, applied in the direction of liquid solution solvent extraction, etc., can solve the problems of dissolution loss, secondary pollution of brine phase and organic solvent, etc.

Inactive Publication Date: 2013-08-21
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the traditional fully mixed liquid-liquid-liquid three-phase extraction equipment involves the dissolution loss of the organic solvent phase in the brine phase, and the secondary pollution of the brine phase and the organic solvent

Method used

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  • Three-phase solvent air-assist continuous extraction method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] See figure 1 A three-phase solvent gas-assisted continuous extraction equipment includes an air flotation column 1 with a gas inlet at the bottom (the inner diameter of the air flotation column is 21mm, and the total length is 550mm), and the top of the air flotation column 1 is further provided with an enlarged separation Phase zone 17; the enlarged phase separation zone 17 is an inverted conical container, the lower mouth of the conical container is connected to the air flotation column 1, and the diameter of the upper opening of the conical container is greater than that of the air flotation column 1 diameter. The air flotation column includes a lower phase mass transfer area 2, a middle phase mass transfer area 3 and an upper phase mass transfer area 4 from bottom to top, wherein, the lower phase mass transfer area 2 is filled with a brine phase 13, and the brine phase 13 Contain organic matter or ionic substances to be separated; the lower phase mass transfer zone...

Embodiment 2

[0070] The three-phase solvent gas-assisted continuous extraction equipment and process of Example 1 are used to carry out three-phase solvent gas-assisted continuous extraction. The difference is that the object to be separated is replaced by an ionic substance, and the polymer is replaced by polyethylene glycol. It is an EOPO block copolymer, the organic solvent is changed from n-hexane to n-nonane solution of thioether, and the ratio (volume ratio) of polymer phase: organic solvent phase: brine phase is changed from 1:1:8 to 1.5:. 1.5:7.

[0071] The brine phase contains the binary components of Pd and Pt as the ionic substances to be separated. The system uses 1mol / L hydrochloric acid as the collection reagent of Pd and Pt, and then prepares Pd ions and Pt ions in the brine phase. The concentration in all is the brine solution of about 100mg / L; The polymer phase adopts the aqueous solution of the EOPO of 50% in mass percent concentration, and the organic solvent phase is t...

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Abstract

The invention relates to a three-phase solvent air-assist continuous extraction method. The method is performed by using three-phase solvent air-assist continuous extraction equipment. The equipment comprises an air flotation column with a gas inlet at the bottom, wherein the air flotation column comprises a bottom-phase mass transfer region, an intermediate-phase mass transfer region and a top-phase mass transfer region from bottom to top in sequence; a salt water phase containing an organic matter or a ionic substance to be separated is filled in the bottom-phase mass transfer region; a polymer phase is filled in the intermediate-phase mass transfer region; an organic solvent phase is filled in the top-phase mass transfer region; the bottom-phase mass transfer region also comprises a gas distributor which is positioned at the bottom of the bottom-phase mass transfer region; a partition plate with holes is also arranged between the bottom-phase mass transfer region and the intermediate-phase mass transfer region; gas is introduced into the air flotation column from the gas inlet; produced bubbles carry with the organic matter or the ionic substance to be separated in the salt water phase to transfer upwards; and the organic matter or the ionic substance in a lower salt water phase is extracted into the polymer phase filled in the intermediate-phase mass transfer region and the organic solvent phase filled in the top-phase mass transfer region to finish a three-phase solvent air-assist continuous extraction process.

Description

technical field [0001] The invention relates to a three-phase solvent gas-assisted continuous extraction method. technical background [0002] With the development of modern industry, people put forward higher and higher requirements for separation technology. The preparation of high-purity substances, the deep utilization of resources, the deep processing of products, and the strict implementation of environmental governance standards have promoted the rapid development of separation science. The requirements of modern industry for high standards of separation technology are manifested in the fact that the separation system is becoming more and more complex, the content of the components to be separated is getting smaller and smaller, and the properties of the separation objects are getting more and more similar, which prompts the emergence of some new separation technologies. As a traditional separation process, solvent extraction technology has a broad application backgr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D11/04
Inventor 刘会洲于品华赵君梅黄昆
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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