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Light and heavy phase alternate feeding countercurrent extraction process

A technology of alternate feeding and extraction, applied in the direction of liquid solution solvent extraction, etc., can solve the problems of back mixing, reduce mass transfer efficiency, and generate liquid flooding, and achieve the effect of suppressing back mixing effect, improving extraction efficiency, and small retention fraction.

Inactive Publication Date: 2017-01-11
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The above-mentioned extraction processes, on the one hand, use the internal components of the extraction tower or external energy to continuously regenerate the surface of the dispersed phase and form fine droplets to enhance convective mass transfer, so as to improve the extraction efficiency, but on the other hand, the fine droplets of the dispersed phase are easily absorbed. The countercurrent flow of the continuous phase is taken away, causing adverse phenomena such as back mixing, thereby reducing the mass transfer efficiency, and even prone to flooding, which is also a pair of main contradictions in the extraction process

Method used

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  • Light and heavy phase alternate feeding countercurrent extraction process

Examples

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Effect test

Embodiment 1

[0035] The liquid-liquid system to be separated in this embodiment is a kerosene-water system, water is the continuous phase, and benzoic acid is extracted from kerosene into water as a solute.

[0036] In this embodiment, there are three stages of sieve trays in the extraction tower 7, the aperture of each stage of sieve trays 10 is 0.50mm, the hole spacing is 2.50mm, and the height of the extraction stage of the extraction tower is 5cm.

[0037] First through the preparatory stage, after the continuous phase is full of the extraction tower, the first feed pump 3 communicated with the dispersed phase storage tank 1 is opened, and the first electric valve 13 communicated with the raffinate phase storage tank 14 is passed into the dispersed phase, dispersed The flow rate of phase is 873.53kg / m 2 / h, while the dispersed phase is fed, the raffinate is discharged through the dispersed phase outlet 12 positioned at the top of the extraction tower 7, stored in the raffinate phase st...

Embodiment 2

[0044] The liquid-liquid system to be separated in this embodiment is ethyl acetate-water system, water is the continuous phase, and ethanol is extracted from ethyl acetate into water as a solute.

[0045] In this embodiment, there are five stages of sieve trays 10 in the extraction tower 7, the aperture of each stage of the sieve trays 10 is 2.0 mm, the hole spacing is 5.0 mm, and the height of the extraction stage of the extraction tower is 5 cm.

[0046] After first passing through the preparation stage, open the first feed pump 3 communicated with the dispersed phase storage tank 1, and the first electric valve 13 communicated with the raffinate phase storage tank 14 leads to the dispersed phase, and the flow rate of the dispersed phase is 15465.52kg / m 2 / h, while the dispersed phase is fed, the raffinate is discharged through the dispersed phase discharge port 12 positioned at the top of the extraction tower 7, stored in the raffinate phase storage tank 14, and the first...

Embodiment 3

[0053] The liquid-liquid system to be separated in this embodiment is ethyl acetate-water system, water is the continuous phase, and ethanol is extracted from ethyl acetate into water as a solute.

[0054] In this embodiment, there are five stages of sieve trays 10 in the extraction tower 7, the aperture of each stage of the sieve trays 10 is 2.0 mm, the hole spacing is 5.0 mm, and the height of the extraction stage of the extraction tower is 5 cm.

[0055] After first passing through the preparation stage, open the first feed pump 3 communicated with the dispersed phase storage tank 1, and the first electric valve 13 communicated with the raffinate phase storage tank 14 leads to the dispersed phase, and the flow rate of the dispersed phase is 5207kg / m 2 / h, while the dispersed phase is fed, the raffinate is discharged through the dispersed phase discharge port 12 positioned at the top of the extraction tower 7, stored in the raffinate phase storage tank 14, and the first feedi...

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Abstract

The invention discloses a countercurrent extraction process with light phase and heavy phase alternate feeding. Through a preparation stage, a running stage is entered after an extraction tower is filled with a dispersed phase, a dispersed phase feeding pump is started, the dispersed phase enters the extraction tower, a dispersed phase outlet valve is started simultaneously, and the dispersed phase feeding pump and a raffinate phase outlet valve are shut down after a set dispersed phase feeding time so as to stop feeding and stand; then a continuous phase feeding pump is started, a continuous phase enters the extraction tower, a continuous phase outlet valve is started simultaneously, and the continuous phase feeding pump and an extraction phase outlet valve are shut down after a set continuous phase feeding time to stop feeding and then stand; the running stage is recycled. The countercurrent extraction process disclosed by the invention adopts an alternate feeding process, so that the advantages of continuous extraction such as large production capacity, low labor intensity and small occupied area of equipment are ensured, and the advantages of intermittent extraction such as sufficient delamination of the extraction phase and the raffinate phase without backmixing between the extraction phase and the raffinate phase are also achieved, meanwhile, by combining with the equipment structure, droplets of the dispersed phase are reduced, and the extraction efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of extraction and separation, in particular to a countercurrent extraction process with alternate feeding of light and heavy phases. Background technique [0002] Liquid-liquid extraction, also known as extraction, is a unit operation that uses the different solubility of the components in the system to separate the mixture. Liquid-liquid separation is a traditional separation technology, which is widely used in industry because it operates at room temperature and has low energy consumption. [0003] In industry, the extraction process is divided into continuous and batch operation modes. The advantages of continuous extraction are large production capacity, low labor intensity, and small equipment footprint. The disadvantages are that the separation of the extraction phase and the raffinate phase is not sufficient, and the back-mixing between the extraction phase and the raffinate phase is serious, which g...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D11/04
Inventor 南碎飞王喆窦梅
Owner ZHEJIANG UNIV
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