Cellulose acetate nanofiltration membrane and preparing method thereof

A cellulose acetate, nanofiltration membrane technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., to achieve the effects of good thermal stability, improved retention rate, and increased porosity

Inactive Publication Date: 2016-02-17
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it has not been reported that it is used to prepare nanofiltration membrane materials.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] 1) Preparation of casting solution: 0.7g ZIF-8-NH 2 Disperse evenly in 64g of acetone under ultrasonic conditions, dissolve 5.3g of lithium chloride in ZIF-8-NH at 70°C with stirring 2 / acetone mixed solution, and then 30g of cellulose diacetate in ZIF-8-NH 2 / acetone / lithium chloride mixed solution dissolved for 3h, filtered, left to stand for degassing to obtain the cellulose acetate casting solution for use;

[0039] 2) Film making: use a glass rod to scrape the casting solution prepared in step 1) on a glass plate with a layer of polyester non-woven fabric on the surface, and place the nascent film at a temperature of 18°C ​​and a relative humidity of Volatilize for 80s under 50% air;

[0040] 3) Coagulation bath treatment: the flat nascent membrane prepared in step 2) is phase-separated and solidified in deionized water at 24°C to form a membrane material;

[0041] 4) Soaking treatment: Soak the membrane material prepared in step 3) with deionized water for 24 ...

Embodiment 2

[0045] 1) Preparation of casting solution: 10g MOF-177 was uniformly dispersed in 500g dimethylacetamide under ultrasonic conditions, and 90g polyethylene glycol 400 was dissolved in MOF-177 / dimethylacetamide at 80°C under stirring conditions. In the mixed solution of amide, then dissolve 400g cellulose triacetate in the mixed solution of MOF-177 / dimethylacetamide / polyethylene glycol 400 for 5h, filter, stand for defoaming to obtain the cellulose acetate casting solution. use;

[0046] 2) Membrane production: extrude the cellulose acetate casting solution prepared in step 1) and the medium (nitrogen gas, flow rate 20mL / min) that forms the inner cavity of the fiber through a spinneret to obtain a nascent hollow fiber membrane, and The nascent film is placed in the air with a temperature of 25°C and a relative humidity of 30% for 10 seconds;

[0047] 3) Coagulation bath treatment: The hollow fiber nascent membrane prepared in step 2) is phase-separated and solidified in a mixed...

Embodiment 3

[0052] 1) Preparation of casting solution: 0.1g ZIF-8-(NH 2 ) 2 Disperse evenly in 899g dioxane under ultrasonic conditions, dissolve 0.9g polyethylene glycol 200 in ZIF-8-(NH 2 ) 2 / dioxane mixed solution, then 100g diacetate cellulose in ZIF-8-(NH 2 ) 2 / Dissolve in the mixed solution of dioxane / polyethylene glycol 200 for 2h, filter, stand for defoaming to obtain cellulose acetate casting solution for later use;

[0053] 2) Membrane production: Extrude the cellulose acetate casting solution prepared in step 1) and the medium (40% dioxane aqueous solution) that forms the inner cavity of the fiber through a spinneret to obtain a nascent hollow fiber membrane, and The nascent eco-film was volatilized for 100 seconds in air with a temperature of 10°C and a relative humidity of 90%;

[0054] 3) Coagulation bath treatment: the hollow fiber nascent membrane prepared in step 2) is phase-separated and solidified in 40% ethanol aqueous solution at 35°C to form a membrane materi...

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Abstract

The invention discloses a cellulose acetate nanofiltration membrane and a preparing method thereof. The preparing method of the cellulose acetate nanofiltration membrane includes the steps that cellulose acetate serves as a raw material, an organic metal framework compound and a small molecule pore-forming agent serve as a mixed additive, the raw material and the mixed additive are dissolved through a solvent to prepare a cellulose acetate membrane casting solution, a dry and clean glass plate with a supporting layer is coated with the prepared membrane casting solution to form a plate nascent-state membrane or the prepared membrane casting solution and a medium with an inner fiber cavity are extruded through a spinneret plate to obtain a hollow fiber nascent-state membrane, the hollow fiber nascent-state membrane is solidified and subjected to heat treatment, and the cellulose acetate nanofiltration membrane is prepared. As the cellulose acetate nanofiltration membrane is prepared through the organic metal framework compound, the porosity factor of the cellulose acetate nanofiltration membrane is increased, and the water flux is improved; the amine-modified organic metal framework compound is introduced into the formula of the membrane casting solution of the cellulose acetate, the nanofiltration membrane can show charged positive electricity after cross-linking, separation of amino acid with positive charges and protein with positive charges can be promoted, and the reject rate of the nanofiltration membrane is increased.

Description

technical field [0001] The invention relates to the field of polymer membrane materials, in particular to a cellulose acetate nanofiltration membrane and a preparation method thereof. Background technique [0002] Nanofiltration is a new type of separation membrane that came out in the late 1980s. It has two notable features: first, its molecular weight cut-off is between reverse osmosis membrane and ultrafiltration membrane, about 200-2000; second, nanofiltration membrane has a certain rejection rate for inorganic salts, because its surface separation layer Consists of polyelectrolytes. From a structural point of view, nanofiltration membranes are mostly composite membranes, that is, the chemical composition of the surface separation layer of the membrane and its support layer is different. The nanofiltration membrane separation process has no chemical reaction, no heating, no phase transition, no destruction of biological activity, no change of flavor and aroma, so it is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/16B01D67/00
Inventor 刘必前汪前东李兰
Owner INST OF CHEM CHINESE ACAD OF SCI
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