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Process method for regenerating ionic liquid and separating and recovering absorbents

A technology of ionic liquids and process methods, which is applied in the fields of ionic liquid regeneration and absorbent separation and recovery, can solve the problems of inability to obtain high-purity ionic liquids, the regeneration process takes a long time, and the slow diffusion process of absorbents, etc., to achieve resource recovery. , improve regeneration efficiency, and solve the effect of difficult regeneration

Inactive Publication Date: 2012-07-18
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has the following problems: First, this method cannot completely remove the absorbant in the ionic liquid, and cannot obtain a high-purity ionic liquid; secondly, due to the high viscosity of the ionic liquid and the slow diffusion process of the absorbate, the regeneration of the ionic liquid is difficult. The process takes a long time, and the regeneration efficiency is low; again, because the regeneration of ionic liquid depends largely on the vacuum degree during regeneration, and it is difficult to achieve a high vacuum degree in industry, and it needs to consume a lot of energy; finally, Absorbents in ionic liquids are difficult to collect and utilize after high-temperature vacuum treatment

Method used

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  • Process method for regenerating ionic liquid and separating and recovering absorbents

Examples

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Effect test

Embodiment 1

[0033] This example illustrates the use of water vapor for 2 1-butyl-3-methylimidazolium tetrafluoroborate for regeneration and SO 2 For separation and recovery, a packed tower is used as the regeneration tower, and the purging conditions are 110°C and 0.10 MPa.

[0034] Will SO 2 Add 1-butyl-3-methylimidazolium tetrafluoroborate with a content of 12.0% into the ionic liquid storage tank, heat the storage tank to 110°C, and transport the ionic liquid to the regeneration tower through a pump, and the regeneration tower is used as filler The tower is equipped with Raschig rings as packing. The upper part of the regeneration tower is equipped with a liquid distribution device, and the lower part is equipped with a gas distribution device. Control the temperature in the tower to 110°C, adjust the gas flow rate so that the volume ratio of the ionic liquid to the water vapor is 1:2000, and the pressure is 0.10 MPa. The ionic liquid is sprayed from the top of the tower through the...

Embodiment 2

[0037] This example illustrates the use of ethanol vapor for 2 1-butyl-3-methylimidazolium bromide for regeneration and SO 2 For separation and recovery, a plate tower is used as the regeneration tower, and the purging conditions are a temperature of 90°C and a pressure of 0.10 MPa.

[0038] Will SO 2 Add 1-butyl-3-methylimidazolium bromide with a content of 10% into the ionic liquid storage tank, heat the storage tank to 90°C, and transport the ionic liquid to the regeneration tower through a pump, and the regeneration tower is a plate tower. Control the temperature in the tower to 90°C, adjust the gas flow so that the volume ratio of ionic liquid to ethanol vapor is 1:2500, and the pressure is 0.10 MPa. The ionic liquid is sprayed from the top of the tower through the circulation pump, and the gas enters from the bottom of the tower , discharged from the top of the tower, the steam is contacted with the ionic liquid for mass transfer, and after 1 hour of countercurrent con...

Embodiment 3

[0041] This example illustrates the use of water vapor for 2 Tetramethylguanidine lactate for regeneration and SO 2 For separation and recovery, a bubble column is used as the regeneration column, and the purging conditions are temperature 120°C and pressure 0.10 MPa. And compared with the traditional method, it shows the advantages of this method.

[0042] Will SO 2 Tetramethylguanidine lactate with a content of 15.0% is added to the ionic liquid storage tank, the storage tank is heated to 120°C, and the ionic liquid is transported to the regeneration tower through a pump, and the regeneration tower is a bubble tower. Control the temperature in the tower to 120°C, adjust the gas flow so that the volume ratio of ionic liquid to water vapor is 1:5000, and the pressure is 0.10 MPa. Exhausted from the top, the sweeping gas is in contact with the ionic liquid for mass transfer, and after purging for 1 hour by the bubbling method, the SO in the ionic liquid 2 The content can be...

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Abstract

The invention provides a process method for regenerating an ionic liquid and separating recovering absorbents. The method for regenerating an ionic liquid and separating recovering absorbents is implemented by taking steam such as water and ethanol as sweeping gases, adopting different tower types, sweeping and removing absorbent in the ionic liquid at the temperature of 40-200 DEG C and under the pressure of 0.01-2.0MPa, and condensing the swept gases to separate steam from the absorbents. According to the process method, steam is enabled to pass through the ionic liquid through a bubbling or gas-liquid inverse contact method, the mass transfer effect is enhanced by adopting various tower types, and the regeneration of the ionic liquid is realized; the steam is cooled into a liquid by condensing, and the absorbents are kept in a gaseous state, so that the swept absorbents are separated and recovered; and the condensed steam is reheated and applied to sweeping of the ionic liquid. Due to the adoption of the process method provided by the invention, the ionic liquid can be regenerated effectively in a short time, and the reutilization of the ionic liquid and separation and recovery of the absorbents are realized.

Description

technical field [0001] The invention relates to a process for regeneration of ionic liquid and separation and recovery of absorbent. Specifically, the present invention relates to a method for contacting the ionic liquid and steam in a regeneration tower to purge the absorbent in the ionic liquid, realize the regeneration of the ionic liquid, and separate and recover the absorbent. Background technique [0002] Ionic liquids are salts composed of organic cations and inorganic or organic anions that are liquid at room temperature to 100°C. It evolved from traditional high-temperature molten salts, but compared to conventional ionic compounds, ionic liquids are liquid in a wide temperature range around room temperature. Ionic liquids have many excellent properties: a wide range of liquid temperature, from below or close to room temperature to above 300 °C, good thermal and chemical stability; almost no vapor pressure; adjustable structure and controllable properties of ionic ...

Claims

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Application Information

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IPC IPC(8): B01D3/38B01D53/14
Inventor 吴卫泽任树行田士东
Owner BEIJING UNIV OF CHEM TECH
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