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A non-woven matrix composite membrane for lithium isotope separation and its preparation method and method for membrane chromatography to separate lithium isotopes

A lithium isotope and membrane chromatography technology, which is applied in the field of membrane chromatography for separating lithium isotopes, non-woven-based composite membranes and their preparation, can solve the problems of difficult elution of lithium isotopes and low separation efficiency of lithium isotopes, and achieves easy continuous production, The effect of realizing continuous production and avoiding the phenomenon of drift

Inactive Publication Date: 2016-03-30
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] However, the use of ion exchange chromatography to separate lithium isotopes has the following disadvantages and deficiencies: first, ion exchange chromatography is used to separate lithium isotopes, and the lithium isotopes adsorbed in the resin are difficult to elute. In addition, the crown ether with lithium isotope separation ability The cryptane resin is filled in the separation tower, and the separation efficiency of lithium isotopes is low due to the gaps between the resin particles.
So far, there is no report on the separation of lithium isotopes by membrane chromatography

Method used

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  • A non-woven matrix composite membrane for lithium isotope separation and its preparation method and method for membrane chromatography to separate lithium isotopes
  • A non-woven matrix composite membrane for lithium isotope separation and its preparation method and method for membrane chromatography to separate lithium isotopes
  • A non-woven matrix composite membrane for lithium isotope separation and its preparation method and method for membrane chromatography to separate lithium isotopes

Examples

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Effect test

Embodiment 1

[0057] Using 4-aminobenzo15crown5-grafted polysulfone polymer material (capacity of crown ether is 0.1mmol / g) to prepare a non-woven matrix composite membrane for lithium isotope separation, the preparation method includes the following steps: first, use alkali Catalytic hydrolysis method is carried out modification to polyester nonwoven fabric (modification treatment step: the ethanol solution of the NaOH of 7g / L, the aqueous solution of 0.5g / L fixation accelerator, described fixation accelerator is hexadecyl Trimethylammonium bromide; put the non-woven fabric into the container, add the ethanol solution of NaOH and the aqueous solution of the fixation accelerator at a ratio of 70:1 by volume, and then heat it in a constant temperature water bath at 40°C for 2 hours, and take it out And soak in ethanol for 2 hours to remove the fiber surface solution; then place the sample in an electric heating constant temperature blast drying oven to dry), cut out a certain area of ​​the mo...

Embodiment 2

[0063] Composite membranes were prepared by impregnation as described in Example 1, except that the 4-aminobenzo 15 crown 5 grafted polysulfone polymers were replaced by 4-hydroxybenzo 15 crown 5 grafted polysulfone polymers (crown Ether immobilization capacity is 2.0mmol / g), 4-aminobenzo 12 crown 4 graft polysulfone polymer (crown ether immobilization capacity is 1.0mmol / g), 4-hydroxybenzo 14 crown 4 graft polysulfone Polymer (capacity of crown ether is 0.8mmol / g), 4-aminobenzo18crown6 grafted polysulfone polymer (capacity of crown ether is 0.6mmol / g), 4-formylbenzo13crown 4-grafted polyvinyl alcohol (capacity of crown ether is 3.0mmol / g), 4-formylbenzo15crown 5-grafted polyvinyl alcohol (capacity of crown ether is 1.1mmol / g), 4-formyl Benzo-12-crown 4-grafted polyvinyl alcohol (capacity of crown ether is 0.7mmol / g), 4-formylbenzo14crown-4 grafted polyvinyl alcohol (capacity of crown ether is 2.0mmol / g), The above-mentioned graft polymers are respectively made of dimethylsul...

Embodiment 3

[0065] To prepare a nonwoven-based composite membrane for lithium isotope separation, the preparation method includes the following steps: firstly, the nonwoven fabric is modified by alkali-catalyzed hydrolysis (the modification treatment steps are the same as in Example 1), and the modified nonwoven fabric is cut into Take out a certain area, soak it in absolute ethanol for 24 hours to remove impurities on the surface of the membrane, and take it out to dry. 4-Aminobenzo21crown 7 grafted polysulfone polymer (capacity of crown ether is 0.2mmol / g), 4-aminobenzo15crown5 grafted polyetheretherketone polymer (capacity of crown ether is 1.2mmol / g), 4-hydroxybenzo15crown5 grafted polyetheretherketone polymer (crown ether solid loading is 0.7mmol / g), 4-aminobenzo15crown5 grafted polyethersulfone polymer (crown ether solid loading is 1.2mmol / g), 4-carboxybenzo 18 crown 6 grafted polyethylene-vinyl alcohol (crown ether solid loading is 2.6mmol / g), 4-carboxybenzo 21 crown 7 graft Branc...

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Abstract

The invention provides a non-woven base composite membrane for lithium isotope separation and a preparation method thereof, as well as a lithium isotope separation method by using a membrane chromatography. The non-woven base composite membrane takes a non-woven fabric as a porous support body or a micropore membrane, a coating is prepared on the non-woven fabric by taking a crown ether graft polymer or a Kryptofix graft polymer with a lithium isotope separation effect as a film forming matter, or a coating can be prepared on the non-woven fabric by blending crown ether or Kryptofix and derivates of the crown ether or the Kryptofix into a film-formation polymer solution, and the coating and a base membrane are combined to form a composite separated membrane; the composite separated membrane is taken as a membrane chromatography medium stationary phase, so as to separate lithium isotopes by using the membrane chromatography. The non-woven base composite membrane or the lithium isotope separation method by using the membrane chromatography can effectively improve the contact and coupling efficiency of crown ether molecules and Lithium Ions in the separation process for solid-liquid extraction lithium isotopes, and realize the greenization, serialization and high efficient of the process of lithium isotope separation.

Description

technical field [0001] The invention belongs to the technical field of membrane materials and lithium isotope separation, and in particular relates to a non-woven matrix composite membrane used for lithium isotope separation, a preparation method thereof, and a method for separating lithium isotopes by membrane chromatography. Background technique [0002] Lithium (Li) is the lightest metal element in the world. Lithium is widely found in various minerals, fluids and rocks in nature. There are abundant lithium resources in the world, with proven reserves of about 36.7 million tons. my country is the third largest producer of lithium resources, with an annual output of about 3,500 tons. [0003] Natural lithium consists of lithium 6 ( 6 Li) and lithium 7 ( 7 Li) two isotopic compositions, their abundances are 7.52% and 92.48%, respectively. 6 Li and 7 Li is completely different in nuclear performance, and it plays an extremely important role in the development of the four...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/285B01J20/30B01D59/26B01D15/42
Inventor 李建新严峰何本桥王虹
Owner TIANJIN POLYTECHNIC UNIV
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